JP2000147194A - Divided shielding lid for storage house of radioactive substance and method for attachment/detachment of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to carry in and out radioactive substances in a few number of times of operation by a small crane device while sufficiently reducing the leak of radiation from the radioactive substances. SOLUTION: This divided shielding lid has a main lid member 21 equipped with a step section reduced gradually in a prescribed unit of amount from the upper side to the lower side on one and the other end faces respectively, and a plurality of sub-lid members 22 equipped with a step section decreased and increased in a prescribed unit of amount from the upper side to the lower side on one and the other end faces respectively. The opening of the main body of a storage house for carrying in and out substances is blocked by arranging the step sections of the main and sub-lid members 21 and 22 with the step sections bend overlapped each other. The main lid member 21 consists of the first lid member 2a and the sixth lid member 2a' that are divided in layer-form in each step section. The sub-lid members 22 comprises the sub-lid member 2b and the seventh lid member 2b' that are divided in layer-form in every step section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive material pit-type or silo-type storage-type storage shield used for storing radioactive materials in a nuclear power plant, a reprocessing plant, and the like, and a method of attaching and detaching the same. It is.

[0002]

2. Description of the Related Art Generally, a pit type or silo type storage for radioactive material has a radioactive material loading / unloading port on its upper surface so that the radioactive material can be carried in and out while being suspended from a crane device. I have. In addition, during storage, the leakage of radiation is sufficiently reduced by closing the loading / unloading port with a shielding cover made of concrete or the like having a large thickness.

[0003] In the case of a large opening area at the loading / unloading opening of the storage, a single-piece shielding lid becomes considerably heavy, so that a dividing type shielding lid which can be divided into a plurality of lid members is usually used. The lid is used to prevent the crane used for opening and closing the loading / unloading port from becoming too large. At this time, as shown in FIG. 35, when the end face of each lid member 52 is formed in a straight line as shown in FIG. Leaks in the sign direction.

[0004] Therefore, the conventional split-type shielding lid is shown in FIG.
As shown in (a) to (c), the end surface of each lid member 52 is formed in a step shape, and the lid member 5 on the end portion side in the loading / unloading port 51a.
The configuration in which the second step is pressed by the step of the central lid member 52 reduces leakage of the radioactive substance during storage. The split shield lid thus configured also has a reduced leakage of radiation when the radioactive substance 53 is loaded and unloaded by performing the following procedure for attaching and detaching the lid members 52.

That is, first, after the cover member 52 existing at the position A at the center is removed, the cover members 5 at the positions B and C are removed.
Remove 2 Then, after carrying in / out the radioactive substance 53 to / from the first storage section and the second storage section, the cover member 52 at the position C is attached, and the radioactive substance 53 is carried in / out to the third storage section.

Next, while attaching the cover member 52 at the position B, the cover members 52 at the position D and the position E are withdrawn, and the radioactive substance 53 is carried into and out of the fourth and fifth storage sections, respectively. Then, the cover member 52 at the position E is mounted, and after the radioactive substance 53 is carried in and out of the sixth storage portion, the cover member 52 at the position D is mounted. Then, after carrying in and out of the radioactive substance 53 to the seventh position,
By mounting the cover member 52 at the position A, all the radioactive substances 53 are kept in a state where a part of the carry-in / out port 51a is always closed.
Can be completed. FIG.
Although there are many examples of the step structure (Z portion) of 4 (c), since it is not a requirement of the present invention, the description is omitted.

[0007]

However, in the above-described conventional configuration and the attaching / detaching procedure, the radioactive substance 53 is carried in and out of the storage sections (the first storage section and the fourth storage section) at both ends of the storage main body 51. At this time, it is necessary to remove the three lid members 52 from the center (position A) to the ends (position C and position E), so that the carry-in / out port 51a is opened with an unnecessarily large area. Radiation leakage cannot be reduced sufficiently. If the radiation leakage cannot be sufficiently reduced, an unfavorable situation in radiation management, which causes an increase in the air dose rate above the storage body 51, occurs, and the crane device breaks down during the loading and unloading of the radioactive substance 53. As in the case, when the operator needs to mount the lid member 52 in a radioactive atmosphere, there is a problem that the exposure dose is increased.

Further, conventionally, the storage body 51
Even if only the loading / unloading of the first storage section is performed, the three lid members 52 from the center (position A) to the ends (position C and position E) need to be attached and detached. There is a problem in that the opening and closing work of the lid member 52 tends to be wasteful.

Further, in the conventional split type shielding lid, the lid member 5
When the size of the cover member 52 is made to correspond to the radioactive material 53 so that the cover member 52 does not become an obstacle when the radioactive material 53 is carried in and out, the cover member 52 located at the position A in the center portion is more than the other cover members 52. Easy to increase in size. The increase in the size of the lid member 52 causes a need to increase the size of the crane device that transports the lid member 52 and the radioactive substance 53. Further, when the opening area of the loading / unloading port 51a becomes large, a space for temporarily placing a large number of lid members 52 is required.
Therefore, in the related art, there is a problem that the crane device is increased in size and a large space for temporary placement is required, thereby increasing the equipment cost.

Therefore, the present invention enables a relatively small crane device to carry in and out the radioactive material 53 and to sufficiently reduce the radiation leakage when the radioactive material 53 is carried in and out. At the entrance 5
In the state where the opening area of 1a is suppressed to a necessary minimum and the number of attaching / detaching operations of the lid member 52 is reduced,
It is an object of the present invention to provide a split type shielding lid capable of carrying in and out of No. 3 and a method of attaching and detaching the same.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 can be implemented at a loading / unloading port for each single opening section of the storage main body. That is, a main lid member having a stepped portion reduced by a predetermined amount from the upper surface side to the lower surface side on each of one end surface and the other end surface, and a stepped portion reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-cover members provided on one end surface and the other end surface, respectively, and a split-type shielding cover for closing a carry-in / out port of the storage main body by arranging the main cover member and the sub-cover member while overlapping the steps. In the above, the main lid member is composed of a layered main member divided into layers for each step portion, and the sub lid member is composed of a layered sub member divided into layers for each step portion. .

According to the above construction, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is minimized for each single opening section by the method according to claim 5 described later. Since the main lid member and the sub lid member are divided by the layered main member and the layered sub member, the main lid member and the sub lid member can be attached and detached by using the layered main member and the layered sub member as a unit of transportation. Therefore, since the layered member is a flat plate that is easy to manufacture, the loading and unloading of radioactive materials can be performed using a crane device corresponding to the layered main member and the layered sub-member that are lighter than the main lid member and the sub-lid member. Equipment costs can be reduced.

According to a second aspect of the present invention, there is provided a main cover member provided with a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and a main cover member having a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In the division type shielding lid that closes the loading / unloading port, the main lid member is a layered main member having the same width as the sub lid member and divided into layers at each step, and a width of the sub lid member from the main lid member. , And the sub-lid member is formed of a layered sub-member divided into layers at each step.

According to the above construction, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is minimized for each single opening section by the method according to claim 5 described later. The main lid member is divided by the layered main member and the inverted convex member, and the sub lid member is divided by the layered sub member. Therefore, all of the members except the inverted convex member can be formed as flat plates having the same dimensions, which facilitates manufacture. Since it is possible to carry in and out the radioactive material using a crane device corresponding to the layered main member, the layered sub member, and the inverted convex member which are lighter than the main lid member and the sub lid member, it is possible to reduce equipment costs. it can.

According to a third aspect of the present invention, there is provided a main cover member provided with a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface side to the lower surface side, and by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In the division type shielding lid for closing the loading / unloading port, the main lid member is composed of a layered main member divided into layers for each step portion, and the sub lid member is formed integrally with each step portion. It is characterized by.

According to the above configuration, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is suppressed to a necessary minimum by the method according to any one of claims 6 to 10 described below. Furthermore, since the main lid member, which is generally the largest, is divided by the layered main member, the loading and unloading of radioactive materials is performed using a crane device corresponding to the layered main member and the sub-lid member that are lighter than the main lid member. Therefore, equipment costs can be reduced.

According to a fourth aspect of the present invention, there is provided a main cover member having a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and a main unit having a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In the division type shielding lid for closing the loading / unloading port, the main lid member is a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting a width of the first member from the main lid member. The sub lid member is characterized in that each step is integrally formed.

According to the above configuration, the radioactive material can be carried in and out while the opening area of the carry-in / out port is suppressed to a minimum by the method according to any one of claims 6 to 10 described below. Further, the main lid member is divided into a main member having the same shape as the sub lid member and an inverted convex member. Therefore, the loading and unloading of the radioactive material can be performed by using a crane device corresponding to the main member, the inverted convex member, and the sub-lid member, which is lighter than the main lid member, so that equipment costs can be reduced.

According to a fifth aspect of the present invention, there is provided the method of attaching or detaching the split type shielding lid according to the first or second aspect, wherein the main lid member is pulled out and temporarily placed at a standby position to thereby remove the main lid member. A temporary placement step of forming an opening at the extraction position, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and a sub-lid member adjacent to the opening for each layered sub-member. A transfer step of transferring the wafer to the opening to form a new opening, a repeating step of repeating the loading / unloading step and the loading step until loading or unloading is completed or interrupted, and the standby position after the repeating step. And a shielding step of transferring the main lid member to the opening. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. In addition, the operation can be performed for each single opening, and the place for temporarily placing the lid only requires the space for the main lid member.

According to a sixth aspect of the present invention, there is provided the method of attaching or detaching the split type shielding lid according to the third or fourth aspect, wherein the main lid member is pulled out and temporarily placed at a standby position to thereby remove the main lid member. A temporary placement step of forming an opening at the extraction position, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and a horizontal lid surface withdrawing the sub-lid member adjacent to the opening. After turning, the turning and transferring step of transferring to the opening to form a new opening, a repeating step of repeating the loading and unloading step and the turning and transferring step until the end of loading and unloading or interruption, And a shielding step of transferring the main lid member at the standby position to the opening after the repetition step. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. In addition, the operation can be performed for each single opening, and the place for temporarily placing the lid only requires the space for the main lid member.

According to a seventh aspect of the present invention, there is provided a method of attaching / detaching a split-type shielding lid, comprising: a main lid member having a stepped portion reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface; A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Are arranged so as to overlap with each other so as to close the loading / unloading port of the storage main body, wherein the main lid member is pulled out and temporarily placed in a standby position, thereby removing the main lid member. A temporary placement step of forming an opening at a position, a loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening, and a sub lid member adjacent to the opening was pulled out and turned on a horizontal plane. rear,
A swivel transfer step of transferring to the opening to form a new opening, an iterative step of repeating the loading / unloading step and the swivel transfer step until the end of loading / unloading or interruption, and And a shielding step of transferring the main lid member at the standby position to the opening. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. In addition, the operation can be performed for each single opening, and the place for temporarily placing the lid only requires the space for the main lid member.

An eighth aspect of the present invention is a method of attaching and detaching a split type shielding lid, comprising: a main lid member having a stepped portion reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface; A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Is a method of attaching / detaching a division type shielding lid that closes the loading / unloading port of the storage main body by arranging the storage lids in an overlapping manner, wherein the storage lid main body is arranged in the forward direction such that the main lid member is located at one end side. A first loading / unloading port closed with a split-type shielding lid, and a plurality of second loading / unloading ports closed with split-type shielding lids arranged in the opposite direction so that the main lid member is located on the other end side; But with the same dimensions, Re or are arranged in parallel direction,
Temporarily removing the main lid members of the first loading / unloading port and the specific second loading / unloading port and temporarily placing the main lid members at a standby position, thereby forming an opening at the removal position of each main lid member; A loading / unloading step of loading / unloading the radioactive substance to / from the storage main body through the opening of the first loading / unloading port, and pulling out the sub lid member adjacent to the opening of the first loading / unloading port and the opening of the second loading / unloading port, The transfer step of transferring a new opening to each of the openings of the second loading / unloading port and the first loading / unloading port, and the loading / unloading step and the transferring step are repeated until the loading / unloading ends or is interrupted. A repetition step, and in the repetition step, after the opening position of the first loading / unloading port moves to the end, the next second
After transferring the main cover member of the loading / unloading port, setting the specific second loading / unloading port as the first loading / unloading port, and setting the next second loading / unloading port as the specific second loading / unloading port, the new first loading / unloading port. And the second
A separate storage transfer step of performing the repetition step between the loading and unloading port,
After the repeating step, the main lid member at the standby position is moved to the first position.
And a shielding step of transferring the data to the opening of the loading / unloading port and the opening of the second loading / unloading port. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. Further, a turning device for turning the sub lid member on a horizontal plane as in the case of the sixth and seventh aspects can be dispensed with. Furthermore, the attaching / detaching operation of the main lid member at the time of shifting the repetitive process performed between the first loading / unloading port and the second loading / unloading port between the new first loading / unloading port and the second loading / unloading port. Can be reduced.

According to a ninth aspect of the present invention, there is provided a method of attaching and detaching a split type shielding lid, comprising: a main lid member provided with a stepped portion which is reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface; A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Is a method of attaching / detaching a division type shielding lid that closes the loading / unloading port of the storage main body by arranging the storage lids in an overlapping manner, wherein the storage lid main body is arranged in the forward direction such that the main lid member is located at one end side. The first loading / unloading port closed with the split-type shielding lid and the second loading / unloading port closed with the split-type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side. Plural sets are the same size and the loading / unloading longitudinal direction or loading By being arranged side by side in any direction of the mouth width direction, the main lid members of the first loading / unloading port and the second loading / unloading port in the specific set of the plurality of sets are respectively pulled out and temporarily placed at the standby position, A temporary placement step of forming an opening at a position where the main lid member is removed, a first loading / unloading step of loading / unloading the radioactive substance into / from the storage main body through the opening of the first loading / unloading port, A first transfer step of removing the auxiliary lid member adjacent to the opening of the loading / unloading port, transferring the sub lid member to the opening of the first loading / unloading port, and forming a new opening in the second loading / unloading port, A second loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening of the loading / unloading port, and removing the sub-lid member adjacent to the opening of the first loading / unloading port, and opening the second loading / unloading port. To form a new opening at the first loading / unloading port. A loading step, a repetition step of repeating the first loading / unloading step, the first transfer step, the second loading / unloading step, and the second transfer step until the loading / unloading ends or is interrupted, and the standby after the repetition step. And a shielding step of transferring the main lid member at the position to the openings of the first loading / unloading port and the second loading / unloading port, respectively. Further, during the repetition process, when the first loading / unloading port and the second loading / unloading port move to the end and work is continued, the first and second loading / unloading ports are closed using another set of main lid members. In addition, it is also possible to shift to a separate storage in which a new set of storages is provided with an opening. According to the above configuration, it is possible to carry in and out the radioactive material with a smaller number of attachment / detachment operations of the lid member than in the case of claim 8, and the opening corresponding to the size of the main lid member and the sub lid member is formed. Since the radioactive material can be carried in and out while being sequentially formed, the radiation area can be sufficiently reduced by suppressing the opening area of the carry-in / out port to the minimum necessary. Note that there is no problem even if the order of the first transfer step and the second transfer step is reversed.

According to a tenth aspect of the present invention, there is provided a method of attaching / detaching a split-type shielding lid, comprising: a main lid member having a stepped portion reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface; A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Are arranged so as to overlap each other, so as to close the loading / unloading port of the storage main body, wherein the main lid member has a first member formed in the same shape as the sub lid member; The sub-cover member is formed of an inverted convex member obtained by subtracting the width of the first member from the cover member, and the sub-cover member is formed integrally with each stepped portion. Divisions arranged in a positive direction so that they are located on the side A first transfer port which is closed by the shielding cover,
A plurality of sets each including a second loading / unloading port closed with a split-type shielding lid arranged in the opposite direction so that the main lid member is located at the other end side have the same dimensions as the loading / unloading port in the longitudinal direction. It is arranged in parallel in any direction of the width direction of the loading / unloading port, and removes the inverted convex member of the first loading / unloading port and the second loading / unloading port and the first member of the first loading / unloading port in the specific set of the plurality of sets. A temporary placement step of forming an opening at the first loading / unloading port to enable the loading / unloading of the radioactive material by temporarily removing it at the standby position; and a step of radiating the storage body through the opening of the first loading / unloading port. A first loading / unloading step of loading / unloading a substance, and removing a first member or a sub-lid member adjacent to the opening of the second loading / unloading port, transferring the material to the opening of the first loading / unloading port, and renewing a new one. A first transfer step of forming an opening at a second loading / unloading port, A step out second input for performing loading and unloading of radioactive materials for the storage body through the opening of the inlet and outlet,
A second transfer step of removing the auxiliary lid member adjacent to the opening of the first loading / unloading port, transferring the sub lid member to the opening of the second loading / unloading port, and forming a new opening in the first loading / unloading port; A repetition step of repeating the first loading / unloading step, the first transfer step, the second loading / unloading step, and the second transfer step until the end of loading / unloading or interruption; and a main lid at the standby position after the repetition step. And a shielding step of transferring the member to the openings of the first loading / unloading port and the second loading / unloading port, respectively. According to the above configuration, the radioactive substance can be carried in and out with a smaller number of attaching and detaching operations of the lid member than in the case of claim 8, and the size of the main lid member and the sub lid member can be adjusted.
Since the radioactive substance can be carried in and out while sequentially forming fewer openings, the leakage of radiation can be sufficiently reduced by suppressing the opening area of the carry-in / out port to the minimum necessary. In addition, separate storage transfer can be performed.

According to an eleventh aspect of the present invention, there is provided the split type shielding lid according to any one of the first to fourth aspects, wherein a radioactive substance having a predetermined width P is stored in the storage main body. The width of the loading / unloading port is W, the distance from the end face of the loading / unloading port to the outermost surface of the radioactive substance is e, the gap between the radioactive substances is c, the support width of the lower surface of the loading / unloading lid member is f, The lower surface width of the main lid member is LA, the lower surface width of the sub lid member is LB, the number of radioactive materials that can be installed at the lower surface width of the sub lid member is m, and the number of divisions by the main lid member and the sub lid member is N. When: LA ≧ LB + e + f (1) LB ≧ m (P + c) (2) LA + (N−1) LB = W + 2f (3) These conditional expressions (1) to (3) are satisfied. It is characterized by doing. According to the above configuration, the main lid member and the sub lid member do not hinder the loading / unloading of the radioactive substance, so that the radioactive substance can be loaded / unloaded efficiently.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] A first embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, the split shield lid according to the first embodiment and the storage body 1 constitute a storage for radioactive materials. The storage main body 1 is made of a pit-type or silo-type structure. The pit-type storage main body 1 divides a space surrounded by an outer peripheral wall 3 with a partition wall 4, as shown in FIG. To each of the plurality of storage rooms,
Is provided. On the other hand, as shown in FIG. 3, the silo-type storage main body 1 divides the upper part of the internal space surrounded by the outer peripheral wall 3 with a beam member 5 so that a plurality of storage rooms (internal spaces) can be provided. Is provided.

At the loading / unloading port 1a of the storage main body 1,
As shown in FIG. 1, a split type shielding lid is placed. The split-type shielding lid has a main lid member 21 having a stepped portion, which is reduced by a predetermined amount from the upper surface to the lower surface, on each of one end surface and the other end surface, and decreases and increases by a predetermined amount from the upper surface to the lower surface. And a plurality of sub-lid members 22 each having the stepped portion on one end surface and the other end surface. The main lid member 21 and the sub lid member 22 are arranged while overlapping the steps so that the radiation does not simultaneously pass through the gap between the abutting portions 7a and 8a and leak to the outside. The loading / unloading port 1a of the main body 1 is closed.

The main lid member 21 and the sub lid member 22 described above.
Represents two layers of the upper layer 7 and the lower layer 8 divided into layers at the steps.
It has a layered structure. The main lid member 21 is provided on the first layer 7 of the upper layer 7.
Lid member 2 a (layered main member) and sixth lid member 2 of lower layer 8
a '(layered main member). Each of the sub-lid members 22 includes the second to fifth lid members 2b to 2e (layered sub-members) of the upper layer 7 and the seventh to tenth lid members 2b 'to 2 of the lower layer 8.
e '(layered sub-member). The contact portion 7a between the lid members 2a to 2e in the upper layer 7 and the contact portion 8a between the lid members 2a 'to 2e' in the lower layer 8 are formed by the main lid member 21 and the sub lid member 22. The position is set at a position displaced by a predetermined shift amount d in the horizontal direction so that the portions are overlapped.

The first to tenth lid members 2a to 2e '
As shown in FIGS. 4A to 4C, is formed in a rectangular flat plate shape, and has the same thickness and length. A plurality of engaging portions 9 constituting a lifting mechanism are formed on the upper surface of each of the lid members 2a to 2e '. As shown in FIGS. 5 (a) and 5 (b), each engaging portion 9 is provided with each lid member 2a.
To 2e ', and an insertion opening 9b which is partially open on the upper surface of the engagement hole 9a. The insertion port 9b is formed so as to substantially match the cross-sectional shape of the suspension member 6, and the suspension member 6 has a pivot shaft 6b capable of pivoting at an arbitrary angle and a lower end of the pivot shaft 6b. And hook portions 6a projecting from opposite sides of the portion in opposite directions. The suspension member 6 can be moved up and down by a crane device (not shown), and the hook member 6a is inserted into the engagement hole 9a to rotate the rotation shaft 6b, thereby engaging the engagement member 9 with the engagement member 9. It is possible to switch between a combined state and a released state.

As shown in FIG. 1, of the first to tenth lid members 2a to 2e 'constructed as described above,
The cover members 2b to 2e 'are set to have the same width Lb to Le'. On the other hand, the first lid member 2a is
The width La is obtained by adding twice the displacement d to the widths Lb to Le 'of the lid members 2b to 2e'.

Both ends of the upper layer 7 and the lower layer 8 in the carry-in / out port longitudinal direction (the width direction of the first to tenth lid members 2a to 2e ') are formed on the outer peripheral wall 3 of the storage main body 1. It is supported by the supporting step 3a and the lower supporting step 3b, respectively. These upper support stage 3a and lower support stage 3b
It is formed stepwise inward from the upper end surface of the outer peripheral wall 3, and the depth of the lower support step 3 b is set to the first to tenth lid members 2 a to 2 a.
The thickness is set to match the thickness of 2e '. Also,
The lower supporting step 3b is formed on the entire periphery of the loading / unloading port 1a, and is perpendicular to the plane of the lower layer 8 (the first to tenth lid members 2a).
Ｅ2e ′ in the longitudinal direction).

In the above configuration, an example of a method of attaching and detaching the division type shielding lid when carrying the radioactive substance into the storage main body 1 will be described.

First, as shown in FIG.
Of the first lid member 2a. That is, FIG.
As shown in (b), the crane device is remotely operated to position the suspension member 6 above the first lid member 2a.
Is inserted through the insertion port 9b of the engaging portion 9. When the hook 6a enters the engagement hole 9a, the rotation shaft 6b
Is rotated by 90 ° so that the suspension member 6 is engaged with the engagement portion 9, and then the first lid member 2 a is interposed via the suspension member 6.
Lift and remove.

When the first lid member 2a is withdrawn as described above, the first lid member 2a is temporarily placed in a predetermined standby position (not shown), and then, as shown in FIG. 2a
By pulling out the sixth lid member 2a 'of the lower layer 8 located below the lower part 8 by the same operation as described above, a part of one end of the loading / unloading port 1a is opened (temporary placing step). Then, the radioactive substance 10 is carried into the storage main body 1 through the opening while being suspended by a crane device (not shown), so that the first storage section and the second storage section located below the opening are opened.
Each of the radioactive substances 10 is loaded into the storage section (load-in / out step).

When the transport of the radioactive substance 10 into the first and second storage sections is completed, as shown in FIG. 6C, the second lid member 2b existing in the upper layer 7 is moved to the first and second storage sections. It is transferred to the lower layer 8 above the storage section. After this,
As shown in FIG. 6D, the seventh lid member 2b 'of the lower layer 8 is formed.
Is transferred to the upper surface (upper layer 7) of the second lid member 2b, thereby opening the upper portions of the third storage portion and the fourth storage portion (a transfer step). The radioactive substance 10 is loaded into the third storage section and the fourth storage section by carrying the radioactive substance 10 through the opening while being suspended by a crane device (not shown) (loading-in / out step).

The above operation of opening a part of the upper layer 7 and a part of the lower layer 8 is repeated in order (repeating step), and when the loading of the radioactive substance 10 into the final tenth container is completed, FIG. As shown in e), the sixth lid member 2a 'temporarily placed in the standby place is transferred to the opening of the lower layer 8. Then, the loading / unloading port 1a of the storage main body 1 is closed by placing the first lid member 2a on the upper surface of the sixth lid member 2a '(shielding step). In addition, as shown in FIG.
For example, when the transport of the radioactive substance 10 is stopped in the eighth storage unit before reaching the storage unit, the sixth lid member 2a 'is placed at this opening position so as to close the opening located above the eighth storage unit. And the first lid member 2a are transferred (shielding step).
Note that the unloading of the radioactive substance 10 can be performed by an operation reverse to the above-described operation, and a description thereof will be omitted.

As described above, according to the configuration and the attaching / detaching method of the present embodiment, the radioactive substance 10 can be carried in / out with the opening area of one of the lid members 2a to 2e '. It can be reduced to the minimum necessary. Therefore, like when the crane device breaks down during loading and unloading,
If the operator needs to close the loading / unloading opening 1a in a radioactive atmosphere and at least perform an operation of closing the opening of the lower layer 8 with the sixth lid member 2a ', the direct leakage of radiation from the gap can be prevented. Can only be reduced.
Since the operation of placing the first lid member 2a on the sixth lid member 2a 'can be performed in the reduced radioactive atmosphere, the carry-in / out port 1a can be shortened while sufficiently reducing the exposure of the operator. It can be completely closed in time.

The first to tenth lid members 2a to 2e 'are
As described above, it is desirable that the second to tenth lid members 2b to 2e 'have the same width Lb to Le' in terms of simplicity in manufacturing and on-site management, but satisfy the following conditions. Then, any widths La to Le ′ can be selected.

That is, the first condition that the width La of the first lid member 2a is a length obtained by adding twice the displacement d to the width La 'of the sixth lid member 2a' located below, and Lb = Lb ',
The second condition of Lc = Lc ′, Ld = Le ′, Le = Le ′ and the width La ′ of the sixth lid member 2a ′ are the second
If the third condition that the length is equal to or greater than the width Lb to Le of the fifth lid members 2b to 2e is satisfied, an arbitrary width La to Le can be selected. it can. Here, the reason that the third condition needs to be satisfied is, for example, as shown in FIG. 8, the width L of the sixth lid member 2a '.
If a ′ is smaller than the width Ld of the fourth lid member 2 d, the fourth lid member 2 d cannot be transferred to the opening of the lower layer 8.

In this embodiment, the main lid member 2
The first lid member 2a and the sixth lid member 2a 'that constitute the first member 1 are formed separately, but may be formed integrally if there is room in handling equipment such as a crane. Can simplify the operation of transferring the first lid member 2a and the sixth lid member 2a '.

Further, in the present embodiment, the split type shielding lid has a two-layer structure of the upper layer 7 and the lower layer 8,
The present invention is not limited to this, and may have a three-layer structure of the upper layer 7, the middle layer 11, and the lower layer 8, as shown in FIGS. However, in the case of a three-layer structure,
The sixth lid member 2 in which the width La of the first lid member 2a is located below
The first condition that the length is obtained by adding twice the amount of displacement d to the width La ′ of a ′, and the width of the eleventh lid member 2a ″ in which the width La ′ of the sixth lid member 2a ′ is located below. A second condition that the length is obtained by adding twice the displacement amount d to the width La ″, and Lb = L
b ′ = Lb ″, Lc = Lc ′ = Lc ″, Ld = Ld ′ =
A third condition consisting of Ld ″, Le = Le ′ = Le ″;
The width La ″ of the eleventh lid member 2a ″ is the second to fifth lid members 2b.
It is necessary to satisfy a fourth condition that the length is equal to or larger than the widths Lb to Le of ２2e. However, the fourth condition is that it is practically preferable that all widths other than the first, sixth, and eleventh lid members 2a, 2a ′, 2a ″ are equal to those in the case of a two-layer configuration. The same is true.

[Embodiment 2] A second embodiment of the present invention will be described below with reference to FIG. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The split type cover according to the second embodiment has a main cover 21 and a sub cover 22 as shown in FIGS. 10 (a) and 10 (b). The main lid member 21 includes the sub lid member 2
The first and sixth lid members 2a and 2 divided into layers at the respective steps with the same width as the second to fifth lid members 2b to 2e and the like.
a ′ (layered main member) and the main lid member 21 to the sub lid member 22
And the inversely convex member 12 from which the width is subtracted. The inverted convex member 12 includes an upper layer portion 12a corresponding to the upper layer 7,
The upper layer 12a has a width LA + 2d obtained by adding twice the amount of displacement d to the width LA of the lower layer 12b. On the side of the main lid member 21, the second to fifth lid members 2 b to 2 e (layered sub-members) corresponding to the upper layer 7 of the sub lid member 22 and the lower layer 8 of the sub lid member 22. 7th to 10th lid members 2
b 'to 2e' (layered sub-members) are arranged, and these lid members 2b to 2e 'and 2b' to 2e 'are set to have the same width. Other configurations are the same as those of the first embodiment.

In the above configuration, a method of attaching and detaching the split type shielding lid when carrying the radioactive substance into the storage main body 1 will be described.

First, after the suspension member is engaged with the engaging portion (not shown) of the inverted convex member 12, the inverted convex member 12 is lifted and removed, and temporarily placed in a predetermined standby place. Then, the first
By removing and temporarily placing the lid member 2a and the sixth lid member 2a ', a part of one end of the loading / unloading port 1a is opened (temporary placing step). Thereafter, the radioactive substance 10 is carried into the storage main body 1 via this opening while being suspended by a crane device (not shown), so that the radioactive substance 10 is transferred to the first storage section and the second storage section located below the opening. Each of the substances 10 is loaded (load-in / out step).

When the transport of the radioactive substance 10 into the first and second storage sections is completed, the second lid member 2b existing in the upper layer 7 is moved to the lower layer 8 above the first and second storage sections. Transfer. After this, the seventh lid member 2 of the lower layer 8
By transferring b ′ to the upper surface (upper layer 7) of the second lid member 2b, the upper portions of the third and fourth storage portions are opened (a transfer step). The radioactive substance 10 is loaded into the third storage section and the fourth storage section by carrying the radioactive substance 10 through the opening while being suspended by a crane device (not shown) (loading-in / out step).

The operation of opening the upper layer 7 and a part of the lower layer 8 as described above is repeated in order (repetition step), and when the loading of the radioactive substance 10 into the final tenth container is completed, the waiting place is set. The temporarily placed first lid member 2a (or 2a ') is transferred to the opening of the lower layer 8, and the sixth lid member 2a' (or 2a) is placed on the upper surface of the first lid member 2a. . Then, by transferring the inverted convex member 12 to the opening remaining at the end of the loading / unloading port 1a, the loading / unloading port 1a is transferred.
(Shielding step). Note that the unloading of the radioactive substance 10 can be performed by an operation reverse to the above-described operation, and a description thereof will be omitted.

As described above, according to the configuration and the attaching / detaching method of the present embodiment, the first to tenth lid members 2a to 2e 'can be obtained with the same width, so that the first to tenth lid members 2a
~ 2e 'can be easily created. In addition, if the opening area required for carrying in and out the radioactive substance 10 is set by changing the width of the inverted convex member 12, the width (weight) of the first to tenth lid members 2a to 2e 'can be reduced to a necessary minimum. , The equipment cost can be reduced by using a crane device having a low suspension capacity.

Embodiment 3 A third embodiment of the present invention will be described below with reference to FIGS. The same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 11 (a), the dividing type cover according to the third embodiment has a first cover 14 as a main cover 21 and a second to fifth as a sub-cover 22. Lid member 15 ~
18. As shown in FIG. 12 (b), the first lid member 14 is formed in a reverse convex shape in cross section having a stepped portion reduced by a predetermined amount from the upper surface side to the lower surface side on one end surface and the other end surface, respectively. And the upper part 14a is
Width LA2 (= L) obtained by adding twice the amount of displacement d to width LA1 of 4b.
A1 + 2d).

Each of the second to fifth lid members 15 to 18 has upper portions 15a to 18a and lower portions 15b to 18b, and the upper portion 15a is displaced in the horizontal direction by a shift amount d with respect to the lower portion 15b. Thus, the stepped portion is formed on the one end face and the other end face, each of which has a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. These first to fifth lid members 14 to 18 are
b to 18b are set to the same thickness H and the same total thickness T.

As shown in FIG. 11A, upper and lower support steps 3a and 3b formed on the outer peripheral wall 3 of the storage main body 1 are provided at both ends in the longitudinal direction of the carry-in / out port of the split type cover. Each is supported. These upper support stage 3
a and the lower support step 3 b are formed stepwise inward from the upper end surface of the outer peripheral wall 3. Other configurations are the same as those of the first embodiment.

In the above configuration, a method of attaching and detaching the division type shielding lid when carrying the radioactive substance into the storage main body 1 will be described.

First, after the suspension member is engaged with the engaging portion (not shown) of the first lid member 14, the first lid member 14 is lifted and removed by a crane device, and temporarily placed in a predetermined standby place. As a result, as shown in FIG. 11B, a part of one end of the loading / unloading port 1a is opened (temporary placing step). Thereafter, the radioactive substance 10 is carried into the storage main body 1 via this opening while being suspended by a crane device (not shown), so that the radioactive substance 10 is transferred to the first storage section and the second storage section located below the opening. Each of the substances 10 is loaded (load-in / out step).

Next, as shown in FIG. 11C, the second lid member 15 is lifted up
° After turning in a horizontal plane, the first and second storage units
The upper part of the third storage part and the fourth storage part are opened by being transferred above (the turning transfer step). Then, by carrying in the radioactive substance 10 through this opening while suspending it by a crane device (not shown),
The radioactive substance 10 is loaded in the third storage part and the fourth storage part (load-in / out step).

The operation of opening a part of the loading / unloading port 1a as described above is sequentially repeated (repeating step), and when the loading of the radioactive substance 10 into the final tenth storage section is completed, FIG.
As shown in (d), the opening is closed by transferring the first lid member 14 temporarily placed in the standby place to the opening position above the tenth storage section (shielding step). In addition, as shown in FIG. 13, when the transport of the radioactive substance 10 is stopped in, for example, the seventh storage unit until reaching the final tenth storage unit, the first lid is placed at the opening position above the seventh storage unit. The opening is closed by transferring the member 14 (shielding step). Note that the unloading of the radioactive substance 10 can be performed by an operation reverse to the above-described operation, and a description thereof will be omitted.

As described above, according to the configuration and the attaching / detaching method of the present embodiment, the lid members 14 to
Since 18 can be formed into a single layer without being divided into a plurality of layers, the following three advantages occur. That is, the handling is simple (the upper and lower two layers can be handled twice.) Since the section modulus and the second moment of area of the lid member are increased, the restrictions on the strength are reduced, and the lid members 14 to 18 In some cases, the total thickness T can be suppressed to a minimum necessary for shielding, so that the weight of the divided shielding lid can be reduced. Furthermore, since there is no need to stack the lid members 14 to 18, it is possible to provide a simple configuration in which the engaging portions used to suspend the lid members 14 to 18 protrude from the upper surface.

In this embodiment, FIG.
As shown in the figure, the upper support step 3a and the lower support step 3b of the outer peripheral wall 3 in the carry-in / out port longitudinal direction are configured to be able to support the upper parts 14a to 18a and the lower parts 14b to 18b of the lid members 14 to 18, respectively. However, the present invention is not limited to this as long as the shielding performance can be ensured. That is, FIG.
As shown in FIG. 14 (c), the supporting steps 3c formed on the inside of the upper end of the outer peripheral wall 3 may be configured to support the upper portions 14a to 18a of the lid members 14 to 18, or FIG.
As shown in FIG.
May be configured to support the upper portions 14a to 18a.

In the present embodiment, each lid member 1
4 to 18 are upper portions 14a to 18a and lower portions 14b to 18
Although a two-layer structure b is used, the present invention is not limited to this, and a three-layer structure may be used as shown in FIGS. In addition, each of the lid members 14 to 18 of the present embodiment.
16 (a), both end surfaces in the width direction may be bent perpendicularly to the upper surface and the lower surface as shown in FIG. 16 (a), or the width may be bent as shown in FIGS. 16 (b) and (c). Both end surfaces in the direction may be bent at a predetermined inclination angle θ with respect to the upper surface and the lower surface. In addition, generally, the inclined surface serves as a guide at the time of mounting to facilitate the mounting, and the effective shielding thickness can be set to be larger than the case where it is vertical as shown in FIGS. 16 (b) and (c). Therefore, it is often inclined.

Further, in the present embodiment, FIG.
As shown in (b), the first lid member 14 is formed by integrating the upper part 14a and the lower part 14b, but the present invention is not limited to this. That is, the first lid member 14 is divided into an upper part 14a and a lower part 14b of the first lid member 14 in the vertical direction as necessary, so that the upper member 19a is divided as shown in FIGS. 17 (a) and (b). The first lid member 19 may be formed separately from the first member 19 and the lower member 19b. As shown in FIGS. 18A and 18B, the first lid member 14 includes a first member 20b formed in the same shape as the other second to fifth lid members 15 to 18, and a first lid 20b. Inverted convex member 20a having an inverted convex cross section obtained by subtracting the first member 20b from the member 14
The first lid member 20 may be configured to be divided into two. In the case of these configurations, the weight of the first lid member 19 is distributed to the upper member 19a (the inverted convex member 20a) and the lower member 19b (the first member 20b).
9a and 19b (20a and 20b) can be made lighter than the other second to fifth lid members 15 to 18, so that the second
To crane devices corresponding to the fifth lid members 15 to 18 can be adopted.

[Embodiment 4] A fourth embodiment of the present invention will be described below with reference to FIGS. Note that the same members as those of the third embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 22 (a), the split type cover according to the fourth embodiment has an upper part 14a and a lower part 14b.
The first lid member 14 is a main lid member 21 having a reverse convex shape in cross section, and the second to fifth sub-lid members 22 are vertically displaced upper parts 15a to 18a and lower parts 15b to 18b.
It has lid members 15 to 18 as one set. The lower portion 14b of the first lid member 14 is set to be equal to or wider than the lower portions 15b to 18b of the second to fifth lid members 15 to 18. Each of the split-type shielding lids includes a plurality of, for example, first to third pits or silos formed on the storage main body 1.
The loading / unloading ports 1a, 1a 'and 1a''are closed.

The first to third loading / unloading ports 1a, 1a '.
1a ″ are arranged in the width direction of the loading / unloading port (the longitudinal direction of each of the lid members 14 to 18) as shown in FIG.
The same applies to the arrangement in the longitudinal direction of the loading / unloading port which is the width direction of each of the lid members 14 to 18 as shown in FIG. 20). Prior to the start of loading, the division type shielding lid for closing the first loading / unloading port 1a has the first lid member 14 disposed at the left end position in the drawing, and the second to fifth lid members 15 to 18 are separated from the first lid member 14. It has a normal array configuration arranged in order on the right side in the figure. On the other hand, the split-type shielding lids for closing the second and third loading / unloading ports 1a 'and 1a''are opposite to the split-type shielding lids for closing the first loading / unloading port 1a. 18 are arranged in an inverted arrangement. Note that the subsequent loading / unloading ports, not shown, are closed by the split type shielding lid having the above-mentioned reverse arrangement. still,
The sub-lid members 22 are all formed in the same shape, and are installed in a state of being rotated by 180 ° between the normal arrangement and the reverse arrangement.
As shown in FIG. 22 (a), both ends in the longitudinal direction of the loading / unloading port of the split type shielding lid are supported by supporting steps 3c formed on the outer peripheral wall 3 of the storage main body 1, respectively.
Other configurations are the same as those of the third embodiment.

In the above configuration, a method of attaching and detaching the division type shielding lid when carrying the radioactive substance into the storage main body 1 will be described.

Before starting to carry in the radioactive substance 10,
As shown in FIG. 19 and FIG.
The third loading / unloading ports 1a, 1a ', 1a''are closed by the divisional cover. And radioactive material 10
First, the first lid member 14 of the split type shielding lid closing the first loading / unloading port 1a is lifted and removed by a crane device, temporarily placed in a predetermined standby place, and the same operation is performed. By removing the first lid member 14 'of the second loading / unloading port 1a' and temporarily placing it,
As shown in (b), the left end of the first loading / unloading port 1a in the figure and the right end of the second loading / unloading port 1a 'in the figure are opened (temporary placing step). Then, the radioactive substance 10 is loaded through the opening of the first loading / unloading port 1a (loading / unloading step).

Next, as shown in FIG. 22 (c), the second lid member 15 'of the second loading / unloading port 1a' is lifted upward by a crane device and horizontally moved in the direction of the opening of the first loading / unloading port 1a. Then, it is placed in the opening of the first loading / unloading port 1a.
At this time, the support step 3c of the first loading / unloading port 1a and the second lid member 1
Since the shape of the second lid member 15 'is the same as that of the second lid member 15',
There is no need to turn. Thereafter, as shown in FIG. 22 (d), the second lid member 15 of the first loading / unloading port 1a is lifted upward by a crane device and is horizontally moved in the direction of the opening of the second loading / unloading port 1a '. 2 Placed in the opening of the loading / unloading port 1a ' Also in this case, since the shape of the supporting step 3c of the second loading / unloading port 1a 'and the end of the second lid member 15 match, it is not necessary to turn the second lid member 15 (transfer step). . Then, the first loading / unloading port 1
a, an opening appears between the second lid member 15 'and the third lid member 16 through the opening.
0 is carried in (a carry-in / out step).

Thereafter, as shown in FIG.
The third lid member 16 of the loading / unloading port 1a is transferred to the side of the second lid member 15 of the second loading / unloading port 1a ', and the third lid member 16' of the second loading / unloading port 1a 'is moved to the first loading / unloading port 1a. By transferring to the side of the second lid member 15 ', a new opening appears at the first loading / unloading port 1a, and the radioactive substance 10 is loaded through this opening. Then, by repeating such an operation in order (repeating step), the radioactive substance 10 is carried into the first carrying-in / out port 1a. Then, after the loading into the first loading / unloading port 1a is completed due to the radioactive substance 10 being full or the like, and subsequently, the loading of the radioactive substance 10 into the second storage is performed, as shown in FIG. The first lid member 14 ″ of the third loading / unloading port 1a ″ is transferred to the opening on the right side of the exit 1a in the drawing (separate storage transfer step).

Thereafter, as shown in FIG. 23, the operation between the first loading / unloading port 1a and the second loading / unloading port 1a 'as described above is performed by the second loading / unloading port 1a' and the third loading / unloading port 1a ''. Similarly, the radioactive substance 10 is carried in at the second carry-in / out port 1a '. Further, for example, when the loading of the radioactive substance 10 at the second loading / unloading port 1a 'is stopped halfway, as shown in FIG.
The opening can be closed by transferring the first lid member 14 temporarily placed at a standby location (not shown) to the opening of the carry-in / out opening 1a (shielding step).

As described above, according to the configuration and the attaching / detaching method of the present embodiment, the openings are formed in the first to third loading / unloading ports 1a, 1a ', 1a''without turning each of the lid members 14 to 18. Since it is possible to make the radioactive substances 10 appear sequentially and to carry the radioactive substance 10 through the opening, it is not necessary to provide a swivel mechanism in the crane apparatus, and it is possible to reduce the apparatus cost.

[Fifth Embodiment] A fifth embodiment of the present invention will be described below with reference to FIGS. Note that the same members as those of the fourth embodiment are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 25, the split type shielding lid according to the fifth embodiment has a pit type, a silo type, etc., in the width direction of the loading / unloading port of the storage main body 1 (first to tenth lid members 2a to 2e ').
For example, the first to fourth carry-in / out ports 1a, 1a ', 1a'',1a''''are respectively closed. Then, the odd-numbered loading / unloading ports such as the first loading / unloading port 1a and the third loading / unloading port 1a ″ are arranged in a regular array by alternately disposing the split-type shielding lids in the normal arrangement and the split-type shielding lids in the reverse arrangement. , While the even-numbered loading / unloading ports, such as the second loading / unloading port 1a 'and the fourth loading / unloading port 1a''', are closed with the reversely arranged splitting / closing lids. Other configurations are the same as those of the fourth embodiment.

In the present embodiment, the divisional shielding lids in the normal arrangement and the divisional shielding lids in the reverse arrangement are arranged alternately one by one. However, the present invention is not limited to this. Alternatively, for example, as shown in FIG. 26, a configuration may be adopted in which the divisionally-arranged shielding lids in the normal arrangement and the divisionally-arranged shielding lids in the reverse arrangement are alternately arranged in a plurality of rows such as two rows. Further, for example, as shown in FIG. 27, in the case where a plurality of first to fourth loading / unloading ports 1a, 1a ′, 1a ″, 1a ″ ″ are formed in the loading / unloading longitudinal direction of the storage main body 1, for example. Alternatively, the split-type shielding lids may be arranged alternately in the above-described one row or a plurality of rows.

A description will be given of a method of attaching / detaching the split-type shielding lid when the radioactive substance is carried into the storage main body 1 in the above configuration.

Before starting to carry in the radioactive substance 10,
As shown in FIG. 25 and FIG.
The fourth loading / unloading ports 1a, 1a ', 1a'',1a''''are closed by the divisional cover. When the radioactive substance 10 is carried in, first, the first carry-in / out port 1
The first lid member 14 of the split type shielding lid that closes the first lid member 14 is lifted and removed by a crane device, temporarily placed at a predetermined standby place, and the first lid member 14 of the second loading / unloading port 1a 'is similarly operated. ''
As shown in FIG. 29B, the left end of the first loading / unloading port 1a in the figure and the right end of the second loading / unloading port 1a 'in the figure are opened (temporary placing step). And these first loading / unloading ports 1a
The radioactive substance 10 is carried in through the opening (1st carrying-in / out step).

Next, as shown in FIG. 29 (c), the second lid member 15 'of the second loading / unloading port 1a' is lifted upward by a crane device and horizontally moved in the direction of the opening of the first loading / unloading port 1a. After that, it is placed in the opening of the first loading / unloading port 1a (first transfer step). Then, the radioactive substance 10 is carried in through the opening of the second carrying-in / out port 1a 'which has been enlarged by the removal of the second lid member 15' (second carrying-in / out step). Thereafter, as shown in FIG. 29 (d), the second lid member 15 of the first loading / unloading port 1a is transferred to the opening of the second loading / unloading port 1a 'by a crane device (second loading step). The radioactive substance 10 is carried in through an opening that appears between the second cover member 15 'and the third cover member 16 at the first carry-in / out port 1a (first carry-in / out step).

Next, as shown in FIG. 30 (a), the third lid member 16 of the first loading / unloading port 1a is transferred to the opening of the second loading / unloading port 1a ', whereby the third lid member 16 is moved. The radioactive substance 10 is loaded through the opening of the first loading / unloading port 1a enlarged by withdrawal, and further, the third loading / unloading port of the second loading / unloading port 1a '.
By transferring the lid member 16 'to the opening of the first loading / unloading port 1a, the radioactive substance 10 is loaded through the opening of the second loading / unloading port 1a' which has been enlarged by the removal of the third lid member 16 '. . Then, such an operation is repeated in order (repetition step), and finally, the first loading / unloading port 1a and the second loading / unloading port 1a and the second loading / unloading port 2a are closed as shown in FIGS. The loading of the radioactive substance 10 into the loading / unloading port 1a 'can be performed simultaneously. If the work is interrupted halfway, the first lid member 14
What is necessary is to cover with 14 ', as in the other embodiments.

Although the attachment / detachment method of the present embodiment has been described as applied to a split-type shielding lid having a first lid member 14 integrally formed, for example, FIG.
As shown in (b), the first member 20b and the reverse convex member 20
Also, the present invention can be applied to a split type shielding lid including the first lid member 20 having a configuration divided into two. That is, the first lid member 20
Since the first member 20b is formed in the same shape as the other second to fifth lid members 15 to 18, first, the inverted convex member 20a is temporarily placed in the temporary placing step, and then the first and second lid members 20b are placed. The radioactive substance 10 can be carried in by transferring the inverted convex member 20a in the transfer step in the same manner as the second to fifth lid members 15 to 18.

When the radioactive substance 10 is radioactive waste, the shape is standardized, and the radioactive substance 10 is often stored in an orderly manner. Therefore, as shown in FIG. 31, when the radioactive substances 10 having the same width dimension P are to be stored at regular intervals in the storage, the following conditional expressions (1) to
It is desirable that the relationship satisfy (3). And
If these conditional expressions (1) to (3) are satisfied, it is possible to realize easy production and management of cargo handling work of the split type shielding lid, and at the time of loading / unloading of the radioactive substance 10, the opening. The radioactive material 10 can be moved up and down while maintaining an appropriate gap (at least the distance c between the loaded radioactive materials 10) with respect to the end surfaces (end surfaces of the lid members 14 to 18).

LA ≧ LB + e + f (1) LB ≧ m (P + c) (2) LA + (N−1) LB = W + 2f (3)

W: width of the loading / unloading port e: distance from the end face of the loading / unloading port to the outermost surface of the radioactive substance P: width P of the radioactive substance 10 c: gap between the radioactive substances 10 f: lower surface of the lid of the loading / unloading port Support width LA: Lower surface width of the main lid member (the first lid member 19 in FIG. 17)
LB: Lower surface width of sub lid member m: Number of radioactive substances 10 that can be installed with lower surface width of sub lid member N: Division by lid member composed of main lid member and sub lid member (The total of the main lid member and the sub lid member).

Incidentally, the division type shielding lid is conditional expressions (1) to (3).
If the condition is not satisfied, for example, in the case shown in FIG. 33, when trying to carry in / out the radioactive substance 10 in the second storage section, it interferes with the left end of the B1 cover member in the A stage, and in the A stage b1 Interferes with the right end of the lid member. Therefore, when trying to carry in / out the second storage section, it is necessary to remove the main lid member and the sub lid member or to move up and down while avoiding the interference portion.

Further, as shown in FIG. 32, the split type shielding lid is composed of a main lid member (bottom width: LA) and an inverted convex member AO (bottom width: LA0) and a first member BA (bottom width: LBA). If the following conditional expressions (4) and (5) are satisfied in addition to the conditional expressions (1) to (3) in the case of dividing into In addition to facilitating the management of the cargo handling work, a suitable gap (the loaded radioactive material) with respect to the end faces of the openings (the end faces of the lid members 14 to 18) can be achieved when the radioactive substance 10 is carried in and out. Substance 1
The radioactive substance 10 can be moved up and down while maintaining the interval c of 0 or more).

LBA = LB (4) LA = LAO + LBA (5) In the above general description, the joining surface is vertical, but in practice, it is easy to attach and detach the lid member. In order to compensate for the shielding loss of the joint surface, FIG.
As shown in FIG. 32C and FIG. 32, it is obvious that the present invention can be applied to the case where the joining surface is inclined.

[0084]

According to the first aspect of the present invention, the invention can be carried out at the loading / unloading port for each single opening section of the storage main body. That is, a main lid member having a stepped portion reduced by a predetermined amount from the upper surface side to the lower surface side on each of one end surface and the other end surface, and a stepped portion reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-cover members provided on one end surface and the other end surface, respectively, and a split-type shielding cover for closing a carry-in / out port of the storage main body by arranging the main cover member and the sub-cover member while overlapping the steps. In the above, the main lid member is constituted by a layered main member divided into layers for each step portion, and the sub lid member is constituted by a layered sub member divided into layers for each step portion.

According to the above configuration, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is suppressed to a necessary minimum for each single opening section by the method according to claim 5 described later. Since the main lid member and the sub lid member are divided by the layered main member and the layered sub member, the main lid member and the sub lid member can be attached and detached by using the layered main member and the layered sub member as a unit of transportation. Therefore, since the layered member is a flat plate that is easy to manufacture, the loading and unloading of radioactive materials can be performed using a crane device corresponding to the layered main member and the layered sub-member that are lighter than the main lid member and the sub-lid member. There is an effect that the equipment cost can be reduced.

According to a second aspect of the present invention, there is provided a main cover member provided with a stepped portion on one end surface and the other end surface which is reduced by a predetermined amount from the upper surface side to the lower surface side, and by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In the division type shielding lid that closes the loading / unloading port, the main lid member is a layered main member having the same width as the sub lid member and divided into layers at each step, and a width of the sub lid member from the main lid member. And the sub-cover member is configured by a layered sub-member divided into layers at each step.

According to the above configuration, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is suppressed to a necessary minimum for each single opening section by the method according to claim 5 described below. The main lid member is divided by the layered main member and the inverted convex member, and the sub lid member is divided by the layered sub member. Therefore, all of the members except the inverted convex member can be formed as flat plates having the same dimensions, which facilitates manufacture. Since it is possible to carry in and out the radioactive material using a crane device corresponding to the layered main member, the layered sub member, and the inverted convex member which are lighter than the main lid member and the sub lid member, it is possible to reduce equipment costs. It has the effect of being able to.

According to a third aspect of the present invention, there is provided a main lid member provided with a stepped portion on one end surface and the other end surface which is reduced by a predetermined amount from the upper surface side to the lower surface side, and by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In a division type shielding lid for closing a loading / unloading port, the main lid member is composed of a layered main member divided into layers for each step portion, and the sub lid member is formed such that each step portion is integrally formed. It is.

According to the above configuration, the radioactive material can be carried in and out while the opening area of the carry-in / out port is minimized by the method according to any one of claims 6 to 10 described below. Furthermore, since the main lid member, which is generally the largest, is divided by the layered main member, the loading and unloading of radioactive materials is performed using a crane device corresponding to the layered main member and the sub-lid member that are lighter than the main lid member. Therefore, there is an effect that the equipment cost can be reduced.

According to a fourth aspect of the present invention, there is provided a main cover member provided with a stepped portion on one end surface and the other end surface which is reduced by a predetermined amount from the upper surface to the lower surface, and a main cover member having a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members provided with the reduced and increased step portions on one end surface and the other end surface, respectively, and by arranging these main lid members and sub-lid members while overlapping the step portions, In the division type shielding lid for closing the loading / unloading port, the main lid member is a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting a width of the first member from the main lid member. The sub lid member has a configuration in which each step is integrally formed.

According to the above configuration, the radioactive substance can be carried in and out while the opening area of the carry-in / out port is suppressed to a minimum by the method according to any one of claims 6 to 10 described below. Further, the main lid member is divided into a main member having the same shape as the sub lid member and an inverted convex member. Therefore, the loading and unloading of the radioactive material can be performed using the crane device corresponding to the main member, the inverted convex member, and the sub-lid member that are lighter than the main lid member, so that the facility cost can be reduced. To play.

According to a fifth aspect of the present invention, there is provided the method for attaching / detaching the split type cover according to the first or second aspect, wherein the main cover is detached and temporarily placed at a standby position to thereby remove the main cover. A temporary placement step of forming an opening at the extraction position, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and a sub-lid member adjacent to the opening for each layered sub-member. A transfer step of transferring the wafer to the opening to form a new opening, a repeating step of repeating the loading / unloading step and the loading step until loading or unloading is completed or interrupted, and the standby position after the repeating step. And transferring the main lid member to the opening. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. In addition, the operation can be performed for each single opening, and there is an effect that the place for temporarily placing the lid only needs to be the space for the main lid member.

According to a sixth aspect of the present invention, there is provided the method of attaching or detaching the split type cover according to the third or fourth aspect, wherein the main cover is detached and temporarily placed at a standby position to thereby remove the main cover. A temporary placement step of forming an opening at the extraction position, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and a horizontal lid surface withdrawing the sub-lid member adjacent to the opening. After turning, the turning and transferring step of transferring to the opening to form a new opening, a repeating step of repeating the loading and unloading step and the turning and transferring step until the end of loading and unloading or interruption, And a shielding step of transferring the main lid member at the standby position to the opening after the repetition step. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. In addition, the operation can be performed for each single opening, and there is an effect that the place for temporarily placing the lid only needs to be the space for the main lid member.

The invention according to claim 7 relates to a method for attaching and detaching a split type shielding lid, wherein a main lid member provided with a stepped portion reduced by a predetermined amount from the upper surface side to the lower surface side on one end surface and the other end surface, respectively. A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Are arranged so as to overlap with each other so as to close the loading / unloading port of the storage main body, wherein the main lid member is pulled out and temporarily placed in a standby position, thereby removing the main lid member. A temporary placement step of forming an opening at a position, a loading / unloading step of loading / unloading a radioactive substance to / from the storage body through the opening, and a sub lid member adjacent to the opening was pulled out and turned on a horizontal plane. rear,
A swivel transfer step of transferring to the opening to form a new opening, an iterative step of repeating the loading / unloading step and the swivel transfer step until the end of loading / unloading or interruption, and And a shielding step of transferring the main lid member at the standby position to the opening. According to the above configuration, it is possible to carry in and out the radioactive material while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member,
By suppressing the opening area of the carry-in / out port to the minimum necessary, leakage of radiation can be sufficiently reduced. Moreover,
This can be carried out for each single opening, and there is an effect that the place for temporarily placing the lid only needs to be the space for the main lid member.

An eighth aspect of the present invention is a method of attaching and detaching a split type shielding lid, wherein a main lid member having a stepped portion reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface is provided. A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Is a method of attaching / detaching a split type shielding lid that closes the loading / unloading port of the storage main body by arranging the storage lids in an overlapping manner. A first loading / unloading port closed with a split-type shielding lid, and a plurality of second loading / unloading ports closed with split-type shielding lids arranged in the opposite direction so that the main lid member is located on the other end side; But with the same dimensions, Re or are arranged in parallel direction,
Temporarily removing the main lid members of the first loading / unloading port and the specific second loading / unloading port and temporarily placing the main lid members at a standby position, thereby forming an opening at the removal position of each main lid member; A loading / unloading step of loading / unloading the radioactive substance to / from the storage main body through the opening of the first loading / unloading port, and pulling out the sub lid member adjacent to the opening of the first loading / unloading port and the opening of the second loading / unloading port, The transfer step of transferring a new opening to each of the openings of the second loading / unloading port and the first loading / unloading port, and the loading / unloading step and the transferring step are repeated until the loading / unloading ends or is interrupted. A repetition step, and in the repetition step, after the opening position of the first loading / unloading port moves to the extreme end, the next second loading / unloading section is inserted into the opening of the first loading / unloading port.
After transferring the main cover member of the loading / unloading port, setting the specific second loading / unloading port as the first loading / unloading port, and setting the next second loading / unloading port as the specific second loading / unloading port, the new first loading / unloading port. And the second
A separate storage transfer step of performing the repetition step between the loading and unloading port,
After the repeating step, the main lid member at the standby position is moved to the first position.
And a shielding step of transferring the data to the opening of the loading / unloading port and the opening of the second loading / unloading port. According to the above configuration, since the radioactive material can be carried in and out while sequentially forming the openings corresponding to the sizes of the main lid member and the sub lid member, the opening area of the carry-in / out port is suppressed to a minimum. This can sufficiently reduce radiation leakage. Further, a turning device for turning the sub lid member on a horizontal plane as in the case of the sixth and seventh aspects can be dispensed with. Further, the repetition process performed between the first loading / unloading port and the second loading / unloading port is performed by adding a new first loading / unloading port, which is a separate storage, to the second loading / unloading port.
This has the effect of reducing the number of operations for attaching and detaching the main lid member when moving to and from the carry-in / out port.

A ninth aspect of the present invention is a method of attaching and detaching a split type shielding lid, wherein a main lid member having a stepped portion reduced by a predetermined amount from an upper surface to a lower surface on one end surface and the other end surface is provided. A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Is a method of attaching / detaching a division type shielding lid that closes the loading / unloading port of the storage main body by arranging the storage lids in an overlapping manner, wherein the storage lid main body is arranged in the forward direction such that the main lid member is located at one end side. The first loading / unloading port closed with the split-type shielding lid and the second loading / unloading port closed with the split-type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side. Plural sets are the same size and the loading / unloading longitudinal direction or loading By being arranged side by side in any direction of the mouth width direction, the main lid members of the first loading / unloading port and the second loading / unloading port in the specific set of the plurality of sets are respectively pulled out and temporarily placed at the standby position, A temporary placement step of forming an opening at a position where the main lid member is removed, a first loading / unloading step of loading / unloading the radioactive substance into / from the storage main body through the opening of the first loading / unloading port, A first transfer step of removing the auxiliary lid member adjacent to the opening of the loading / unloading port, transferring the sub lid member to the opening of the first loading / unloading port, and forming a new opening in the second loading / unloading port, A second loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening of the loading / unloading port, and removing the sub-lid member adjacent to the opening of the first loading / unloading port, and opening the second loading / unloading port. To form a new opening at the first loading / unloading port. A loading step, a repetition step of repeating the first loading / unloading step, the first transfer step, the second loading / unloading step, and the second transfer step until the loading / unloading ends or is interrupted, and the standby after the repetition step. And a shielding step of transferring the main lid member at the position to the openings of the first loading / unloading port and the second loading / unloading port, respectively.
Further, during the repetition process, when the first loading / unloading port and the second loading / unloading port move to the end and work is continued, the first and second loading / unloading ports are closed using another set of main lid members. In addition, it is also possible to shift to a separate storage in which a new set of storages is provided with an opening. still,
Even if the order of the first transfer step and the second transfer step is reversed, there is no problem. According to the above configuration, it is possible to carry in and out the radioactive material with a smaller number of attachment / detachment operations of the lid member than in the case of claim 8, and the opening corresponding to the size of the main lid member and the sub lid member is formed. Since the radioactive material can be carried in and out while being sequentially formed, the radiation area can be sufficiently reduced by minimizing the opening area of the carry-in / out port.

A tenth aspect of the present invention is a method of attaching / detaching a split-type shielding lid, wherein a main lid member having a stepped portion reduced by a predetermined amount from an upper surface side to a lower surface side is provided on one end face and the other end face, respectively. A plurality of sub-lid members provided on one end surface and the other end surface with a stepped portion which is reduced and increased by a predetermined amount from the upper surface side to the lower surface side. Are arranged so as to overlap each other, so as to close the loading / unloading port of the storage main body, wherein the main lid member has a first member formed in the same shape as the sub lid member; The sub-cover member is formed of an inverted convex member obtained by subtracting the width of the first member from the cover member, and the sub-cover member is formed integrally with each stepped portion. Divisions arranged in a positive direction so that they are located on the side A first transfer port which is closed by the shielding cover,
A plurality of sets each including a second loading / unloading port closed with a split-type shielding lid arranged in the opposite direction so that the main lid member is located at the other end side have the same dimensions as the loading / unloading port in the longitudinal direction. It is arranged in parallel in any direction of the width direction of the loading / unloading port, and removes the inverted convex member of the first loading / unloading port and the second loading / unloading port and the first member of the first loading / unloading port in the specific set of the plurality of sets. A temporary placement step of forming an opening at the first loading / unloading port to enable the loading / unloading of the radioactive material by temporarily removing it at the standby position; and a step of radiating the storage body through the opening of the first loading / unloading port. A first loading / unloading step of loading / unloading a substance, and removing a first member or a sub-lid member adjacent to the opening of the second loading / unloading port, transferring the material to the opening of the first loading / unloading port, and renewing a new one. A first transfer step of forming an opening at a second loading / unloading port, A step out second input for performing loading and unloading of radioactive materials for the storage body through the opening of the inlet and outlet,
A second transfer step of removing the auxiliary lid member adjacent to the opening of the first loading / unloading port, transferring the sub lid member to the opening of the second loading / unloading port, and forming a new opening in the first loading / unloading port; A repetition step of repeating the first loading / unloading step, the first transfer step, the second loading / unloading step, and the second transfer step until the end of loading / unloading or interruption; and a main lid at the standby position after the repetition step. And a shielding step of transferring the member to the openings of the first loading / unloading port and the second loading / unloading port. According to the above configuration, the separate storage transfer step can also be performed in accordance with the method described in claim 9, and the loading and unloading of the radioactive substance can be performed with a smaller number of times of attaching and detaching the lid member than in the case of claim 8,
Since the loading and unloading of the radioactive material can be performed while sequentially forming fewer openings than in claim 9 corresponding to the size of the main lid member and the sub lid member, by suppressing the opening area of the loading and unloading to the minimum necessary. There is an effect that the leakage of radiation can be sufficiently reduced.

According to an eleventh aspect of the present invention, there is provided the split type shielding lid according to any one of the first to fourth aspects, wherein a radioactive substance having a predetermined width P is stored in the storage body. The width of the loading / unloading port is W, the distance from the end face of the loading / unloading port to the outermost surface of the radioactive substance is e, the gap between the radioactive substances is c, the support width of the lower surface of the loading / unloading lid member is f, The lower surface width of the main lid member is LA, the lower surface width of the sub lid member is LB, the number of radioactive materials that can be installed at the lower surface width of the sub lid member is m, and the number of divisions by the main lid member and the sub lid member is N. When: LA ≧ LB + e + f (1) LB ≧ m (P + c) (2) LA + (N−1) LB = W + 2f (3) These conditional expressions (1) to (3) are satisfied. It is the structure which does. According to the above configuration, the main lid member and the sub lid member do not become an obstacle when the radioactive substance is carried in and out, so that there is an effect that the radioactive material can be carried in and out efficiently.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a basic structure of a division type shielding lid.

FIG. 2 is a perspective view of a pit type storage main body.

FIG. 3 is a perspective view of a silo type storage main body.

4A and 4B are diagrams illustrating an example of an engaging portion of a lid member, wherein FIG. 4A is a plan view, FIG. 4B is a cross-sectional view taken along line AA, and FIG.
FIG.

5A and 5B are diagrams illustrating an example of a state in which a suspension member is engaged with an engagement portion, where FIG. 5A is a front view and FIG. 5B is a side view.

6A and 6B are explanatory diagrams showing a basic process of carrying in a radioactive substance, wherein FIG. 6A shows a state before the start of carrying in, FIG. 6B shows a state immediately after the start of carrying in, and FIG. Status,
(D) is a state in which the carry-in is performed through a new opening, and (e) is a state in which the carry-in is completed.

FIG. 7 is an explanatory view showing a state in which a dividing type cover is closed during loading.

FIG. 8 is an explanatory view showing a defect of the division type shielding lid.

9A and 9B are configuration diagrams of a division type shielding cover, where FIG. 9A is before the start of loading and FIG. 9B is after the loading is completed.

FIGS. 10A and 10B are configuration diagrams of a division type shielding cover, in which FIG. 10A is before a loading start and FIG. 10B is after a loading completion.

FIG. 11 is an explanatory view showing a carrying-in process of a radioactive substance,
(A) is a state before the start of loading, (b) is a state immediately after the start of loading, (c) is a state of being loaded through a new opening,
(D) is a state where loading is completed.

12A and 12B are front views of a lid member, FIG. 12A is a front view of a sub lid member, and FIG. 12B is a front view of a main lid member.

FIG. 13 is an explanatory view showing a state in which the dividing type cover is closed during loading.

FIG. 14 is an explanatory view showing an aspect of a step portion.

FIGS. 15A and 15B are configuration diagrams of a division type shielding cover, in which FIG. 15A shows a state before carrying-in starts and FIG. 15B shows a state after carrying-in is completed.

FIG. 16 is an explanatory view showing an aspect of a step portion.

17A and 17B are configuration diagrams of a division type shielding cover, wherein FIG. 17A shows a state before carrying-in is started, and FIG. 17B shows a state after carrying-in is completed.

FIGS. 18A and 18B are configuration diagrams of a division type shielding cover, in which FIG. 18A is a state before carrying-in is started, and FIG.

FIG. 19 is an explanatory view showing an arrangement state of the division type cover in the width direction of the carry-in / out port.

FIG. 20 is an explanatory diagram showing an arrangement state of the division type shielding lid in the carry-in / out port longitudinal direction.

FIG. 21 is an explanatory view showing an arrangement state of a division type shielding lid.

FIG. 22 is an explanatory view showing a carrying-in process of a radioactive substance,
(A) is a state before the start of carrying in, (b) is a state immediately after the start of carrying in, (c) is a state in which a new opening is formed, (d) is a state in which the carrying is performed through a new opening, (e). ) Indicates a state of being carried in through a new next opening.

FIG. 23 is an explanatory view showing a process of carrying in a radioactive substance.

FIG. 24 is an explanatory diagram showing a state in which the divisional cover is closed during loading.

FIG. 25 is an explanatory diagram showing an arrangement state of the division type shielding lids.

FIG. 26 is an explanatory diagram showing an arrangement state of the division type shielding lids.

FIG. 27 is an explanatory diagram showing an arrangement state of the division type shielding lids.

FIG. 28 is an explanatory diagram showing an arrangement state of a division type shielding lid.

FIG. 29 is an explanatory diagram showing a carrying-in process of a radioactive substance,
(A) is a state before the start of loading, (b) is a state immediately after the start of loading, (c) is a state of being loaded through a new opening,
(D) is a state where it is carried in through a new next opening.

FIG. 30 is an explanatory diagram showing a carrying-in process of a radioactive substance,
(A) is a state where it is carried in through the opening, and (b) is a state where the carry-in is completed.

FIG. 31 is an explanatory diagram showing the relationship between the size of each lid member and the size of a radioactive substance of a split type shielding lid.

FIG. 32 is an explanatory view showing the relationship between the size of each lid member and the size of a radioactive substance of the split type shielding lid when the joining surface is inclined and the main lid member is divided.

FIG. 33 is an explanatory view showing the relationship between the size of each lid member and the size of a radioactive substance of the split type shielding lid.

FIG. 34 is a view showing the structure of a conventional split type shielding lid,
(A) is a plan view, (b) is a sectional view taken along line YY, (c).
Is a sectional view taken along the line XX.

FIG. 35 is an explanatory diagram showing a state in which radiation leaks.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Storage main body 1a 1st loading / unloading port 2a-2e 1st-5th lid member 2a'-2e '6th-10th lid member 3 Outer peripheral wall 4 Partition wall 5 Beam member 6 Suspension member 7 Upper layer 8 Lower layer 9 Engaging part 10 Radioactive substance 12 Inverted convex member 14-18 First to fifth lid member 21 Main lid member 22 Sub lid member

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[Procedure amendment]

[Submission date] November 17, 1998 (1998.11.
17)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction contents]

The above operation of opening a part of the upper layer 7 and a part of the lower layer 8 is repeated in order (repeating step), and when the loading of the radioactive substance 10 into the final tenth storage section (10) is completed, As shown in FIG. 6E, the sixth lid member 2a 'temporarily placed in the standby place is transferred to the opening of the lower layer 8.
Then, the loading / unloading port 1a of the storage main body 1 is closed by placing the first lid member 2a on the upper surface of the sixth lid member 2a '(shielding step). In addition, as shown in FIG.
For example, when the transport of the radioactive substance 10 is stopped in the eighth storage unit up to the zero storage unit (10) , the sixth position is set at the opening position so as to close the opening located above the eighth storage unit.
The lid member 2a 'and the first lid member 2a are transferred (shielding step). Note that the unloading of the radioactive substance 10 can be performed by an operation reverse to the above-described operation, and a description thereof will be omitted.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction contents]

The operation of opening a part of the upper layer 7 and the lower layer 8 as described above is sequentially repeated (repeating step), and when the loading of the radioactive substance 10 into the final tenth storage part (10) is completed, The first lid member 2a (or 2a ′) temporarily placed in the standby place is transferred to the opening of the lower layer 8 and
The sixth lid member 2a '(or 2a) is placed on the upper surface of the lid member 2a. Then, by transferring the inverted convex member 12 to the opening remaining at the end of the loading / unloading port 1a, the loading / unloading port 1a is moved.
Close a (shielding step). In addition, carry out of the radioactive material 10
Since the operation can be performed in a manner reverse to the above operation, the description thereof is omitted.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0056

[Correction method] Change

[Correction contents]

The operation of opening a part of the loading / unloading port 1a as described above is repeated in order (repeating step), and when the loading of the radioactive substance 10 into the final tenth storage part (10) is completed, FIG.
As shown in FIG. 1 (d), the first temporary storage
The opening is closed by transferring the lid member 14 to the opening position above the tenth accommodation section (10) (shielding step). FIG.
As shown in FIG. 3, when the transport of the radioactive substance 10 is stopped in the seventh storage unit, for example, up to the final tenth storage unit (10) , the first lid is placed at the opening position above the seventh storage unit. The opening is closed by transferring the member 14 (shielding step).
Note that the unloading of the radioactive substance 10 can be performed by an operation reverse to the above-described operation, and a description thereof will be omitted.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

FIG. 6

[Procedure amendment 5]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 10

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 11

[Procedure amendment 8]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 9]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 31

[Procedure amendment 10]

[Document name to be amended] Drawing

[Correction target item name] FIG. 32

[Correction method] Change

[Correction contents]

FIG. 32

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. 33

Claims (11)

[Claims] 1. A main lid member having a stepped portion on one end surface and the other end surface which is reduced by a predetermined amount from the upper surface side to the lower surface side, and reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. In the type shielding lid, the main lid member includes a layered main member divided into layers for each step, and the sub lid member includes a layered sub member divided into layers for each step. Characteristic split-type shielding lid. 2. A main lid member having a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and reduced and increased by a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. In the type shielding lid, the main lid member is a layered main member having the same width as the sub lid member and divided into layers at each step, and an inverted convex obtained by subtracting the width of the sub lid member from the main lid member. A split type shielding lid comprising: a mold member; and wherein the sub-lid member is formed of a layered sub-member divided into layers for each step. 3. A main lid member having a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and reduced and increased by a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. In the type shielding lid, the main lid member is composed of a layered main member divided into layers for each step portion, and the sub lid member is formed such that each step portion is integrally formed. Type shielding lid. 4. A main lid member provided with a stepped portion at one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface side to the lower surface side, and reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. In the type shielding lid, the main lid member includes a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting a width of the first member from the main lid member. The sub-lid member is a split type shielding lid, wherein each step portion is integrally formed. 5. The method according to claim 1, wherein the main cover member is withdrawn and temporarily placed at a standby position, so that the main cover member is opened and removed at the withdrawal position. A temporary placing step of forming a portion, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and transferring a sub lid member adjacent to the opening to the opening for each layered sub member. A loading step of loading and forming a new opening; a repeating step of repeating the loading / unloading step and the loading step until the loading / unloading is completed or interrupted; And a shielding step of transferring to the opening. 6. The method according to claim 3, wherein the main cover member is withdrawn and temporarily placed at a standby position, so that the main cover member is opened at the withdrawal position. A temporary placement step of forming a part, a loading / unloading step of loading / unloading the radioactive substance to / from the storage body through the opening, and after turning off in a horizontal plane by pulling out a sub lid member adjacent to the opening, A swivel transfer step of transferring the wafer to the opening to form a new opening, a repetition step of repeating the loading / unloading step and the swivel transfer step until loading or unloading is completed or interrupted, and the standby after the repetition step A step of transferring a main lid member at a position to the opening. 7. A main lid member having a stepped portion, which is reduced by a predetermined amount from the upper surface side to the lower surface side, on each of one end surface and the other end surface, and is reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. A method of attaching and detaching the main cover member, wherein the main cover member is withdrawn and temporarily placed at a standby position to form an opening at the withdrawal position of the main lid member. A loading / unloading step of loading / unloading the radioactive material to / from the storage body via a sub-lid member adjacent to the opening, and turning in a horizontal plane, and then transferring to the opening to form a new opening Rotating transfer process, A repetition step of repeating the unloading step and the turning transfer step until the loading or unloading is completed or interrupted, and a shielding step of transferring the main lid member at the standby position to the opening after the repetition step. How to attach / detach a split-type shielding lid. 8. A main lid member provided with a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and reduced and increased by a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. A method for mounting and dismounting a shielding cover, wherein the storage body is closed with a divided shielding lid arranged in a forward direction such that the main lid member is located at one end side.
The loading / unloading port and a plurality of second loading / unloading ports, which are closed by split type shielding lids arranged in the opposite direction so that the main lid member is located on the other end side, have the same dimensions and are located in the loading / unloading longitudinal direction or the loading / unloading port. It is arranged in parallel in any direction of the outlet width direction, and the main lid members of the first loading / unloading port and the specific second loading / unloading port are respectively pulled out and temporarily placed at the standby position, whereby each main lid member is A temporary placement step of forming an opening at the extraction position, a loading / unloading step of loading / unloading the radioactive material to / from the storage body through the opening of the first loading / unloading port, the first loading / unloading port and the second loading / unloading step. A transfer step in which the sub-lid members adjacent to the opening of the outlet are respectively removed and transferred to the openings of the second loading / unloading port and the first loading / unloading port to form a new opening; And the transfer process are completed or interrupted. And after the opening position of the first loading / unloading port has moved to the end in the repeating step, transferring the main lid member of the next second loading / unloading port to the opening of the first loading / unloading port, After the specific second loading / unloading port is defined as a first loading / unloading port and the next second loading / unloading port is defined as a specific second loading / unloading port, the repetition is performed between the new first loading / unloading port and the second loading / unloading port. Moving the main lid member at the standby position to the first lid after the repetition step.
And a shielding step of transferring the data to the opening of the loading / unloading port and the opening of the second loading / unloading port, respectively. 9. A main lid member having a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface to the lower surface, and reduced and increased by a predetermined amount from the upper surface to the lower surface. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. A method for mounting and dismounting a shielding cover, wherein the storage body is closed with a divided shielding lid arranged in a forward direction such that the main lid member is located at one end side.
A plurality of sets each including a loading / unloading port and a second loading / unloading port closed by a split-type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side, are loaded with the same dimensions. The first loading / unloading port and the second loading / unloading port in a specific set of the plurality of sets are arranged in parallel in any one of the outlet longitudinal direction and the loading / unloading width direction.
By temporarily removing the main lid members at the loading / unloading ports and temporarily placing them at the standby position, forming temporary openings at the withdrawn / unloading positions of the respective main lid members, and via the opening of the first loading / unloading port. A first loading / unloading step of loading / unloading the radioactive material to / from the storage main body, and withdrawing a sub-lid member adjacent to the opening of the second loading / unloading port, and transferring the radioactive substance to the opening of the first loading / unloading port, and renewing the new A first transfer step of forming an opening in a second loading / unloading port; a second loading / unloading step of loading / unloading a radioactive substance into / from a storage body via the opening of the second loading / unloading port; A second transfer step of removing the sub-lid member adjacent to the opening of the second transfer opening and transferring it to the opening of the second transfer opening to form a new opening at the first transfer opening; Step, the first transfer step, the second loading / unloading step, and the second transfer step. A repetition step of repeating until the entry or exit is completed or interrupted; and a shielding step of transferring the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repeating step. How to attach / detach a split-type shielding lid. 10. A main lid member provided with a stepped portion on one end surface and the other end surface, which is reduced by a predetermined amount from the upper surface side to the lower surface side, and reduced and increased by a predetermined amount unit from the upper surface side to the lower surface side. A plurality of sub-lid members each having a step on one end surface and the other end surface, and a partition for closing the loading / unloading port of the storage main body by arranging these main lid members and sub-lid members while overlapping the steps. A method for attaching and detaching a shielding cover, wherein the main lid member is a first member formed in the same shape as the sub lid member, and an inverted convex member obtained by subtracting a width of the first member from the main lid member. Wherein the sub lid member is formed integrally with each stepped portion, and the storage main body has a divided shielding lid arranged in the forward direction such that the main lid member is located at one end side. 1st blocked by
A plurality of sets each including a loading / unloading port and a second loading / unloading port closed by a split-type shielding lid arranged in the opposite direction so that the main lid member is located on the other end side, are loaded with the same dimensions. The first loading / unloading port and the second loading / unloading port in a specific set of the plurality of sets are arranged in parallel in any one of the outlet longitudinal direction and the loading / unloading width direction.
By pulling out the inverted convex member of the loading / unloading port and the first member of the first loading / unloading port and temporarily placing them at the standby position,
A temporary placement step of forming an opening at the first loading / unloading port to enable the loading and unloading of the radioactive material, and a first loading / unloading step of loading / unloading the radioactive substance to / from the storage body via the opening of the first loading / unloading port. And removing the first member or sub-lid member adjacent to the opening of the second loading / unloading port, transferring the first member to the opening of the first loading / unloading port, and forming a new opening in the second loading / unloading port. 1 transfer step, a second loading / unloading step of loading / unloading the radioactive material to / from the storage body through the opening of the second loading / unloading port, and removing a sub lid member adjacent to the opening of the first loading / unloading port. Removing, transferring to the opening of the second loading / unloading port, and forming a new opening in the first loading / unloading port, the first loading / unloading step, the first loading / unloading step, 2 The loading / unloading step and the second transfer step are repeated until the loading / unloading is completed or interrupted. A detaching step, and a shielding step of transferring the main lid member at the standby position to the openings of the first loading / unloading port and the second loading / unloading port after the repetition step, respectively. Method. 11. A radioactive substance having a predetermined width P is stored in the storage body, wherein the width of the loading / unloading port is W, and a distance from an end face of the loading / unloading port to an outermost surface of the radioactive substance. E, the gap between the radioactive materials is c, the support width of the lower surface of the lid member at the loading / unloading port is f, the lower surface width of the main lid member is LA, the lower surface width of the sub lid member is LB, the lower surface width of the sub lid member is When the number of radioactive materials that can be installed is m and the number of divisions by the main lid member and the sub lid member is N, LA ≧ LB + e + f (1) LB ≧ m (P + c) (2) LA + (N -1) LB = W + 2f (3) The split type shielding lid according to any one of claims 1 to 4, wherein the conditional expressions (1) to (3) are satisfied.