JP3069536B2 - Reactor fuel transport container and transport method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reactor container and a method for transporting and storing a reactor fuel, and more particularly to a compact reactor capable of transporting a large number of light water reactor fuels such as mixed oxide fuel bodies at the same time. The present invention relates to a large-capacity nuclear fuel transport container and a transport method thereof.

[0002]

2. Description of the Related Art In a light water reactor such as a boiling water reactor or a pressurized water reactor, a mixed oxide fuel (hereinafter, referred to as a MOX fuel) is used as a reactor fuel. This MOX
After the fuel body is made in the fuel processing facility, it is stored and protected in a fuel protection container, and the fuel protection container is loaded on a fuel transport container for transportation.

[0003] When a light water reactor fuel is transported like a MOX fuel body, if vibrations are applied to the light water reactor fuel, abrasion occurs at a metal contact portion, which is not preferable in terms of maintaining economy and reliability of the light water reactor fuel. In the case of spent fuel, no special measures are taken to prevent vibration, since slight wear caused during transportation is not a problem. Since the spent fuel does not require any special countermeasures against vibration, a compact and large-capacity fuel transport container has been developed that is structurally simple and can store a large number of spent fuels.

On the other hand, in transporting a new fuel body of MOX fuel, since the MOX fuel body is used as a reactor fuel after the transportation, it is necessary to take measures to prevent vibration during transportation from the viewpoint of soundness and reliability. Specifically, after storing the new fuel body or the fuel protection container containing the new fuel body in the basket of the fuel transport container, it is necessary to restrain the new fuel body in the basket by some method and secure it. At that time, the ratio of the space occupied by the lashing device in the basket increases, which is a factor that hinders the development of a large-capacity and compact fuel transport container capable of simultaneously storing a large number of new fuel bodies. Therefore, a compact and large-capacity MOX new fuel transport container comparable to a spent fuel transport container has not been developed.

In transporting a new MOX fuel body, it is very difficult to store the new MOX fuel body in a relatively rigid protective container or inner container in which a protective material or a cushioning material is provided, and transport the new MOX fuel body in the fuel transport container. General. In the conventional fuel transport container, when the MOX new fuel body is directly inserted into the narrow basket hole, the opening area of the basket hole may be increased to some extent because contact scratches may occur at the time of insertion.
In addition, since it is difficult to perform so-called "skipping" in the basket hole, it is necessary to press and secure the four side surfaces of the new fuel body without shifting. For this reason, the space occupied by the lashing device is increased in the fuel transport container, and the occupied space occupied by the lashing device may be larger in the whole fuel transport container than when the protective container is used.

[0006] Here, "to shift" means to move a fuel body vertically inserted into a basket hole of a fuel transport container so as to contact two inner surfaces adjacent to the basket hole. However, since the fuel body has a low bending rigidity, when the fuel body is pressed and moved from one side or two sides in the basket hole, the fuel body itself may be bent, which is one of the causes of the difficulty in biasing. Has become.

When a new MOX fuel assembly is pressed and secured from the four sides into the basket hole of the fuel transport container, one securing device is placed below the fuel assembly in the horizontal state during transportation. Become. Since this securing device must support the weight of the fuel body, a large securing force is required. When the securing force is large, the securing device needs to be strengthened accordingly, and the space occupied by the securing device increases with an increase in size.

If the new MOX fuel body can be stored directly in the basket hole of the fuel transport container and transported without being stored in the protective container, the step of storing the fuel body in the protective container can be omitted, and the transportation cost can be reduced. There is convenience.

[0009]

In a conventional fuel transport container, when light water reactor fuel such as a new MOX fuel body is directly stored and transported in the basket hole, the light water reactor fuel must be offset in the basket hole. There is a problem to be solved and a problem of how to realize a securing method that can exert a maximum securing effect with a small fastening force by a small securing device.

[0010] Further, since the MOX fuel body, which is a light water reactor fuel, has an exothermic property, the temperature inside the fuel transport container rises, and
A difference in elongation occurs between the X fuel body and the basket hole due to a difference in thermal expansion. When the MOX fuel body is directly secured by the fuel spacer portion or the transport spacer portion, a displacement occurs between the components of the MOX fuel body due to a difference in expansion due to thermal expansion. For this reason, there is a strong demand for a securing method that can solve the position shift problem due to thermal expansion. However, in a fuel transport container in which a MOX fuel body is directly stored in a basket hole,
It was difficult to solve these problems with existing fuel transport containers.

The present invention has been made in view of the above circumstances, and directly and stably stores a reactor fuel such as a MOX fuel body in a basket hole to improve the soundness and reliability of fuel transportation. It is another object of the present invention to provide a compact and large-capacity nuclear fuel transport container and its transport method.

Another object of the present invention is to solve the problem of misalignment when the reactor fuel is directly stored in the basket hole, to effectively and sufficiently exert the securing effect with a small fastening force, and to reduce the thermal expansion difference. An object of the present invention is to solve the problem and to provide a reactor fuel transport container capable of transporting a large number of reactor fuels simultaneously and a transport method thereof.

Another object of the present invention is to provide a reactor fuel transport container and a transport method thereof, which can transport a large number of reactor fuels at the same time and reduce the transport cost.

[0014]

According to a first aspect of the present invention, there is provided a nuclear reactor fuel transport container having a plurality of basket holes for accommodating a fuel assembly. Having a built-in basket in a fuel transport container,
When a securing device is installed in each basket hole to fasten and restrain the fuel body in two or one direction except the common facing direction common to all basket holes, and when the fuel transport container at the time of loading the fuel body is placed vertically, The basket may be configured such that the basket axis is inclined from the vertical axis in the diagonal direction when the fuel body tightening direction is two directions, or in that direction when the fuel body tightening direction is one direction, or the transport container body accommodating the basket. It is inclined in a diagonal direction or one direction.

According to a second aspect of the present invention, there is provided a transport container for a fuel for a nuclear reactor, wherein the transport container for the nuclear fuel is biased to the bottom of each basket hole of the basket for storing the fuel body. A fuel body receiving base with a function is fixedly provided. The fuel body receiving base is provided with a fuel body receiving portion at a position of a fuel body which is offset by tightening, and a conical or tapered portion is provided on an upper side of the fuel body receiving portion. A guide for shifting the fuel body in a shape or the like is provided.

Further, in order to solve the above-mentioned problems, the nuclear fuel transport container according to the present invention has the following features.
The basket has a V-shape in which two adjacent inner surfaces of a basket hole that is in contact with the stored fuel body are the lower side of the fuel body, and both lower inner surfaces are inclined at about 45 degrees from horizontal, The fuel assembly is supported on both inner surfaces of the V-shape, and the fuel assembly is fastened and fastened in two directions by a fastening device installed on two basket hole walls above the fuel assembly.

Further, in order to solve the above-mentioned problem, the fuel container for transporting a nuclear reactor according to the present invention has a structure in which, when the fuel transport container is placed in a horizontal state at the time of transfer, the basket is formed as follows. Two adjacent inner surfaces of the basket hole that is in contact with the stored fuel body are the lower side of the fuel body, and both lower inner surfaces are inclined about 45 degrees from the horizontal.
The fuel body is formed in a V-shape, the fuel body is supported on both inner surfaces of the V-shape, and the fuel body is fastened and secured in one downward direction by a securing device installed on the upper basket hole wall.

Still further, in order to solve the above-mentioned problems, the basket for transporting nuclear fuel according to the present invention has a structure in which, when the fuel transport vessel is placed in a horizontal state during transfer, Two adjacent inner surfaces of the basket hole that is in contact with the stored fuel body are the lower side of the fuel body, and both lower inner surfaces are inclined about 45 degrees from the horizontal.
It is formed in a shape of a letter and is also inclined in the longitudinal direction of the basket with the bottom side of the fuel transport container facing downward and the top side facing upward.

According to a sixth aspect of the present invention, there is provided a reactor fuel transport container according to the present invention, wherein at least two inner surfaces of the basket hole inner surface which are in contact with the fuel body are provided with: A zirconium alloy or an intermediate member having a linear expansion coefficient similar to that of the zirconium alloy is installed so as to be able to expand and contract in the longitudinal direction with respect to the basket hole wall.

Further, in order to solve the above-mentioned problem, a transport container for a nuclear reactor fuel according to the present invention is provided.
As described in claim 7, a cushioning material such as a honeycomb material, a rubber material, and a resin material is provided on at least two inner surfaces of the inner surface of the basket hole which are in contact with the fuel body.

Further, in order to solve the above-mentioned problems, the nuclear fuel transport container according to the present invention has the following features.
The protective container containing the fuel body is stored in the basket hole, and two inner surfaces in contact with the protective container stored in the basket hole are below the protective container, and both inner surfaces are inclined by about 45 degrees from horizontal. A V-shape is formed, and also in the longitudinal direction of the basket, the fuel transport container is inclined such that the bottom side faces downward and the top side faces upward.

Further, in order to solve the above-mentioned problems, the method for transporting nuclear fuel according to the present invention, in which the fuel transport container is placed vertically and the mixed oxide fuel body or the like is placed in a vertical position, as described above. Loading a light water reactor fuel, and transporting the fuel transport container from each fuel facility to a nuclear power plant or another facility with the fuel transport container in a horizontal state. Each basket hole is secured by a securing device inward from two inner surfaces of the basket holes which are not opposed to each other and common to all basket holes.
When the fuel body is tightened and constrained in one direction inward from one inner surface of the basket hole or inward from the inner surface of the basket hole, if the fuel body tightening direction is two directions, the basket may be one diagonal direction. Set the basket axis in the direction inclined from the vertical axis in that direction, insert the fuel body by suspending it vertically into the basket hole, and simultaneously insert the fuel rod into the fuel carrier pedestal with the one-sided function. The fuel assembly is guided to complete the offset of the fuel body to both inner side surfaces of the basket hole, and thereafter, the fuel assembly is fastened in the diagonal direction or one direction by the fastening device to be fastened and directly loaded, while the fuel is transported. In the transfer step of placing the container in a horizontal position, the method is such that the lashing device is transferred in a state where the securing device is located above or beside the basket hole in both the one direction and the two directions. .

Further, in order to solve the above-mentioned problems, the method for transporting nuclear fuel according to the present invention, as described in claim 10, has a fuel transport container placed vertically and a mixed oxide fuel body or the like. Loading a light water reactor fuel, and transporting the fuel transport container from each fuel facility to a nuclear power plant or another facility by placing the fuel transport container in a horizontal state, wherein the loading step comprises: In the transfer step, the two inner surfaces of the basket hole in contact with the fuel body are set to the lower side of the fuel body, and both lower inner surfaces are inclined approximately 45 degrees from the horizontal. A V-shape was formed, the fuel body was supported by both inner surfaces of the V-shape, and the fuel body was fastened and fastened in two directions by a fastening device installed on the two basket hole walls on the upper side of the fuel body. In state It is a method of feeding.

Furthermore, a method for transporting nuclear fuel according to the present invention is intended to solve the above-mentioned problems.
Loading the fuel transport container vertically and loading light water reactor fuel such as a mixed oxide fuel body as described in, and placing the fuel transport container horizontally and from each fuel facility to a nuclear power plant or other facility. In the method of transporting nuclear fuel, the method further comprises the step of loading the fuel body directly into the basket hole in the loading step, and the step of transferring the two inner surfaces of the basket hole in contact with the fuel body in the transfer step. A V-shape is formed by inclining both lower inner surfaces by approximately 45 degrees from horizontal, and the fuel body is supported by both V-shaped inner surfaces, and the upper side of the fuel body is formed. This is a method in which the fuel body is conveyed while being fastened and secured in one downward direction by a securing device installed on the wall of the basket hole.

Still further, a method of transporting nuclear fuel according to the present invention is intended to solve the above-mentioned problems.
Loading the fuel transport container vertically and loading light water reactor fuel such as a mixed oxide fuel body as described in, and placing the fuel transport container horizontally and from each fuel facility to a nuclear power plant or other facility. In the method of transporting nuclear fuel, the method further comprises the step of loading the fuel body directly into the basket hole in the loading step, and the step of transferring the two inner surfaces of the basket hole in contact with the fuel body in the transfer step. A V-shape is formed by making the lower inner surface inclined at about 45 degrees from the horizontal, and the fuel body is supported by the V-shaped inner surfaces, and the transport container is also provided in the longitudinal direction. This is a method of transporting in an inclined state with the bottom side facing downward and the top side facing upward.

Furthermore, in order to solve the above-mentioned problems, the method for transporting nuclear fuel according to the present invention, wherein the fuel transport container is set vertically and the mixed oxide fuel body or the like is placed vertically, Loading the light water reactor fuel, and transporting the fuel transport container from each fuel facility to a nuclear power plant or another facility with the fuel transport container placed in a horizontal state. In the transfer step, the two inner surfaces of the basket hole in contact with the protective container are set to the lower side of the protective container, and both lower inner surfaces are set to approximately 45 degrees from the horizontal. The container is inclined at an angle to form a V-shape, and the protective container is supported on both inner surfaces of the V-shape, and the transport container is also transferred in an inclined state with the bottom of the transport container facing downward and the top facing upward in the longitudinal direction. It is a method.

On the other hand, in order to solve the above-mentioned problem, a method for transporting nuclear reactor fuel according to the present invention is characterized in that, in the loading step, in the loading step, at least the fuel contacting at least the fuel body on the inner surface of the basket hole is provided. On one inner surface, a zirconium alloy having a thermal expansion coefficient substantially equal to that of the fuel body or an intermediate member having a linear expansion coefficient substantially equal to that of the zirconium alloy is installed so as to be able to expand and contract in the longitudinal direction with respect to the basket hole wall, and this intermediate member is installed. In this method, the fuel body is directly loaded into the basket hole of the fuel transport container, and in the transfer step, the inside of the basket hole in which an intermediate member such as a zirconium alloy is installed is transferred downward.

On the other hand, in order to solve the above-mentioned problem, the method for transporting nuclear reactor fuel according to the present invention, in the loading step, comprises: Honeycomb material,
In a fuel transport container equipped with cushioning materials such as rubber and resin materials,
While the fuel body is directly loaded, in the transfer step, the inside of the basket hole in which the cushioning material is installed is transferred as the lower side of the fuel body.

[0029]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view showing a first embodiment of a nuclear reactor fuel transport container according to the present invention.
Shows a fuel transport container for directly storing a MOX fuel body as a light water reactor fuel. The fuel transport container 10 includes the basket 11 for directly storing the fuel body, and does not require a protective container for storing the fuel body.

The basket 11 of the fuel transport container 10 has a plurality of basket hole elements 12 formed of a square tube, a square tube, or the like, and a square cylindrical basket hole 13 forming a fuel body storage chamber in each basket hole element 12. Is formed. The fuel body is stored in the basket hole 13,
The stored fuel body is fastened by the securing device 14 and secured. The securing device 14 is supported on the side wall of each basket hole element 12, and has a clamping plate 15 in each basket hole 13 so as to be able to advance and retreat. At that time, each basket hole element 1
2 are two directions (excluding the facing direction) common to all the basket holes 13, and are the downward direction and the right direction in the drawing of FIG.

Thus, a number of basket hole elements 12 are arranged and aligned, and all basket hole elements 12 are integrally connected by a connecting member (not shown) to form a cylindrical basket 11 as a whole. As shown in FIG.
Is configured.

The fuel transport container 10 is set upright when a fuel body is loaded. When the fuel body is loaded, the basket 11 is set with the basket axis a extending in the longitudinal direction in the transport container main body 16 inclined by the angle α from the vertical axis b, as shown in FIG. In the case of the basket 11 shown in FIG. 1, the basket top is inclined in the diagonal direction of the two tightening directions by the lashing devices 14, 14, that is, in the direction of arrow C (see FIG. 1).

FIG. 2 is a longitudinal sectional view of the fuel transport container 10 when the fuel body is loaded. At the time of loading the fuel body, the transport container main body 16 of the fuel transport container 10 is installed perpendicular to the horizontal plane HP, but the basket 11 is fixed in the transport container main body 16 in a state where it is inclined with respect to the vertical line by an angle α with respect to the vertical line. Is fixed by a fixing jig (not shown). The direction of the inclination is the direction of arrow C in FIG.

The securing device 14 installed in the basket hole element 12 of the basket 11 has a plurality of tightening plates 15
A driving unit 17 for supporting each tightening plate 15 in the basket hole 13 so as to be able to advance and retreat, a rotating shaft 18 for driving each driving unit 17 to rotate, and a tightening adjustment shaft 19 for driving the rotating shaft 18 to rotate. By rotating the tightening adjustment shaft 19, the rotation is transmitted to the drive unit 17 via the rotating shaft 18, and the tightening plate 15 is driven to move forward and backward. A plurality of fastening plates 15 are provided at appropriate intervals in the longitudinal direction of the basket hole element 12.

On the other hand, the basket 11 has a basket hole 1
3 is provided with a fuel-body receiving base 20 with a one-sided function, and a concave fuel-body receiving part 21 is formed eccentrically in the one-sided direction on the fuel-body receiving base 20 so that the one-sided function can be maintained. The function is assisted. The fuel body receiving portion 21 is provided at a position of the fuel body which is offset by the fastening of the lashing device 14.

The pedestal 20 with the offset function is shown in FIG.
(A) and (B), as shown in FIG.
Is provided at a position shifted in the lower left direction from the center of the cross section of the basket hole 13. The fuel body receiving portion 21 has a conical portion 22 which also serves as a fuel body biasing guide having a tapered shape or a conical shape on the upper side, and a conical portion 22.
, And a three-pronged guide groove 24 formed below the receiving recess 23.

As a light water reactor fuel, for example, a MOX fuel body 25 of a boiling water reactor (BWR) is configured as shown in FIGS.
A three-pronged projection 27 is formed at the tip of the fuel cell, and the three-pronged projection 27 is guided by the guide groove 24 of the fuel body receiving portion 21 and accommodated therein.

An upper tie plate 2 is provided above the fuel body 25.
Each fuel rod 29 is restrained and held by the upper tie plate 28 and the lower tie plate 26, while a plurality of fuel spacers 30 are interposed in the middle of the fuel rods 29, and the fuel rods 29 are held at intervals. A transport separator 31 is detachably provided on the upper and lower portions of each fuel spacer 30 to protect the fuel spacer 30 and the like.

Then, the MOX fuel body 25 is inserted into the basket hole 13 of the basket hole element 12, and the basket 1
1, the three-pronged protrusion 27 at the tip of the lower tie plate 26 of the fuel body 25 is moved from the conical portion 22 of the fuel body receiving portion 21 as the fuel body biasing guide to the guide groove 2.
4 to be accommodated. The position of the fuel body 25 at the bottom of the basket hole 13 is shifted to the lower left in FIG. 3A from the center of the cross section of the basket hole 13 by the fastening of the lashing device 14. It is installed so as to be at the position of the receiving portion 21.

Next, the method of transporting the reactor fuel is shown in FIG.
This will be described with reference to FIG.

The method of transporting the reactor fuel is as follows.
0 and the MOX fuel body 25 as the light water reactor fuel is loaded vertically, and the fuel transport container 10 is placed horizontally and transferred from each fuel processing facility to a nuclear power plant or another storage facility, or stored. Transferring from the facility to a nuclear power plant or other storage facility.

FIGS. 4 and 5 show MO as fuel for light water reactor.
FIG. 4 is an explanatory diagram of a loading step of loading an X fuel body 25 into a fuel transport container 10. The fuel transport container 10 to be used is shown in FIGS. 1 to 3. In the fuel transport container 10, the basket 1 is placed in the transport container body 16 during the loading step.
The fuel assembly 25 is suspended and loaded vertically downward with the basket 1 being inclined from the vertical axis b by the angle α from the vertical axis b.

Each basket hole element 12 of the basket 11
A fuel body receiving table 20 with a one-sided function is fixedly installed at the bottom of the fuel cell. As shown in FIG. 4, each basket hole element 12 of the basket 11 is installed at an angle α with respect to the vertical axis b, and the MOX fuel body 25 is suspended vertically in the basket hole 13 of the basket hole element 12. It is inserted.

The inclination angle α of the basket 11 with respect to the vertical axis b is, as shown in FIG. 4, the required gap g between the fuel body 25 and the inner wall surface (inside surface) of the basket hole 13 and the total length of the basket hole element 12. Is determined from Generally, the angle α is a minute angle having a value of 1 degree or less.

When the fuel body 25 is vertically suspended and inserted into the inclined basket hole 13 and the trifurcated projection 27 at the tip of the lower tie plate 26 reaches the fuel body receiving stand 20, the lower tie plate 26 is It is guided by the conical portion 22 and moves to a position where it should be shifted, and is supported by the fuel body receiving portion 21.

After the lower tie plate 26 of the fuel body 25 is supported by the eccentric fuel body receiving portion 21 of the fuel body pedestal 20 and the fuel body hanger (not shown) is removed, the inner wall of the basket hole element 12 and the basket The fuel body 25 leans against the inner wall of the basket hole element 12 because the hole 13 and the fuel body receiving portion 21 are inclined. That is, at the same time that the fuel body 25 is inserted into the basket hole 13 of the basket hole element 12, the shifting of the fuel body 25 is automatically, smoothly, and smoothly completed.

After all of the MOX fuel bodies 25 have been inserted into the respective basket holes 13 of the basket 11, as shown in FIG. By pressing the fuel bodies 25 with the plate 15 to fasten and secure them, the loading process of each fuel body 25 is completed.

In the transfer step, the state shown in FIG.
The OX fuel body 25 is accommodated in the basket hole 13 and transferred. That is, one of the two inner surfaces with which the fuel body 25 is biased and contacted in the basket hole 13 is transferred while being kept under the fuel body 25. In the fuel transport container 10, as described in FIG.
The fuel body 25 in two directions common to all the basket holes 13
Are pressed and tightened, and are offset. Therefore, in the fuel transport container 10, the basket 11 is accommodated in the transport container main body 16, so that the transport mode shown in FIG.

The fuel transport container 1 shown in FIGS. 1 to 6
0 is such that the basket 11 is inclined and accommodated in the transport container body 16 so that the fuel body 25 can be easily and easily offset and accommodated in the basket hole 13, and the fuel body 25 can be accommodated in the basket hole 13. Can be stably stored and held.

If it is not possible to offset the fuel body 25 into the basket hole 13 of the basket 11, FIG.
As shown in (A) and (B), generally, the basket body 13 is held vertically and the fuel body 25 is hung vertically and inserted.

After the lower tie plate 26 of the suspended fuel assembly 25 is placed on the fuel assembly receiving portion 21a formed at the center of the fuel assembly pedestal 20a, the four securing devices 14, 14a are provided.
Is driven, and the fastening plate 15 is pressed against the four side surfaces of the fuel body 25 to be fastened and secured.

The lashing devices 14 and 14a may provide a clamping force of the same capacity. However, since the fuel transport container 10a is placed in a horizontal state at the time of transfer, the necessary clamping force is reduced by the lashing devices 14, 14a. It depends on the mounting position of 14a. For example, when the fuel transport container 10a is placed in a horizontal state with the left side face downward during transfer, the securing device 14a needs to support the weight of the fuel body 25. It is common to use a strong one.

FIGS. 8A and 8B show a comparison of the principle of the securing method of the general fuel transport container 10a with the principle of the securing method of the fuel transport container 10 according to the present invention. FIG.

FIG. 8A shows a general fuel transport container 10a.
FIG. 8B shows a fuel transport container 1 according to the present invention.
0 is targeted. General fuel transport container 10
In a, the four lashing device 14, 14a, although the four sides of the square tube-shaped fuel assemblies 25 are clamped by the clamping force f _1, with these clamping force f, of f _1, a lower position tightening force by the lashing device 14a f, f ₁ is greater than the clamping force f due to the remaining three lashing device 14. Clamping force f _1, it is necessary to support the weight of the fuel assembly 25, the fuel mass M, when the gravitational acceleration and G, tightening force f ₁ is clamping force f
And the fuel body weight MG. Each of the tightening forces f and f ₁ is the total value of the tightening force for pressing one side surface of the rectangular tubular fuel body 25 in the longitudinal direction with a plurality of tightening plates 15 distributed and arranged per side surface of the fuel body. It is. Clamping force f, arrow f ₁ represents a tightening direction.

The fuel transport container 10a shown in FIG.
Is four sides to lashing device is present, moreover lashing device 14a is clamping force f ₁ of the lower position around the fuel body 25 (f + M
(G) Because of the size of (G), it is necessary to increase the size of the securing device 14a itself, and a large securing device installation space is required around the fuel body 25 as a whole. Further, the tightening force f required for the other lashing devices 14 varies depending on the transport conditions of the light water reactor fuel, but generally has a value around 1 · MG · G. Therefore, tightening force f ₁ by the lashing device 14a of the lower installation, becomes almost twice the value of the clamping force f, the fuel element 25
The lower lashing device 14a needs to be so strong that a larger space is required.

On the other hand, in the fuel transport container 10 shown in FIG. 8B, two adjacent side surfaces of the fuel body 25 are formed in the basket hole 1 formed in the basket hole element 12.
3, the securing device 14 only needs to be present on the upper surface and one side surface of the fuel body 25, and it is not necessary to install the securing device 14 below the fuel body 25. .

Therefore, the fuel transport container 1 according to the present invention
At 0, the number of lashing devices 14 can be halved,
Each fastening device 14 does not require a large clamping force. For this reason, the size of each securing device 14 can be reduced, the installation space of the securing device can be reduced, and a compact and large-capacity fuel transport container 10 can be provided.

In this fuel transport container 10,
The fuel body 25 of the light water reactor fuel can be directly inserted and stored in the basket hole 13 of the basket 11, and when the fuel body 25 is inserted, the displacement in the basket hole 13 can be smoothly and smoothly performed. This makes it possible to realize the fuel transport container 10 that does not require a securing device below the fuel body 25 in a state where the fuel transport container is placed horizontally during transfer. Therefore, a compact and large-capacity fuel transport container 1
0, and a method of transporting nuclear fuel capable of simultaneously transferring a large number of fuel bodies 25 from each fuel facility to a nuclear power plant or another facility.

FIG. 9 shows a modification of the first embodiment of the reactor fuel transport container according to the present invention.

The fuel transport container 10A shown in this modification example
Is such that the transport container main body 16 containing the basket 11 can be tilted and held at an angle α with respect to the horizontal plane HP by the tilting device. The tilting device is a simple type of tilting member that inserts a spacer into the transport container main body 16 and holds the transport container at an angle α in a horizontal plane.
6 may be a tilting drive device that raises one side surface by a fixed amount, and various tilting devices are conceivable.

The transport container body 16 is at an angle α from the horizontal plane HP.
By tilting the basket 11 only, the top of the basket 11 is tilted from the vertical axis b. Other configurations in which the tilting direction of the basket 11 and the fuel body receiving table 20 with the one-side function are provided at the bottom of the basket hole 13 are the same as those of the fuel transport container 10 shown in FIGS. And the description is omitted.

The fuel transport container 10A shown in this modified example
In this case, it is not necessary to store the basket 11 in an inclined state in the transport container body 16.
The storage state of the basket 11 inside is stabilized.

FIG. 10 shows a second embodiment of the reactor fuel transport container according to the present invention.

The transport container for the reactor fuel shown in this embodiment has a basket 11A stored in the transport container body.
Of the fuel transport container 10 shown in the first embodiment
Unlike the above, the other configurations are not substantially different, and therefore, the same reference numerals are given and the description is omitted.

The fuel transport container 10B shown in FIG.
It is characterized by the arrangement of the basket hole elements 12 constituting the basket 11A. The basket 11A is formed by connecting a large number of basket hole elements 12 by connecting them with a connecting member (not shown), and is formed in an overall cylindrical shape. The basket hole elements 12 constituting the basket 11A are all arranged in the same direction.

FIG. 10 is a cross-sectional view of the basket hole element 12 in the basket 11A of the fuel transport container 10B in a state where the fuel transport container is horizontally placed at the time of transfer.

When the fuel transport container is placed horizontally, the basket hole 13 of the basket 11A constituting the fuel body storage chamber is formed.
Is formed in a V-shape in which two adjacent inner surfaces in contact with the rectangular tubular fuel body 25 are below the fuel body 25, and both lower inner surfaces are inclined at, for example, 45 degrees from the horizontal plane HP, The fuel bodies 25 are supported by the basket holes 13 on both inner surfaces of the V-shape.

In the basket hole element 12 forming the basket hole 13, lashing devices 14 are respectively installed on two basket hole walls located above the fuel body 25, and the lashing devices 14 provided in both the lashing devices 14 are freely movable. The fuel body 25 is pressed from two directions to be fastened and fastened by the fastening plate 15.

In this fuel transport container 10B, the transport of the mixed oxide fuel (MOX fuel) 25, which is the light water reactor fuel, is performed as follows.

In the method of transporting nuclear fuel using the fuel transport container 10B, the loading step of setting the fuel transport container 10B in a vertical position and loading the MOX fuel body 25 as light water reactor fuel is performed. Is provided for transferring the fuel from each fuel facility to a nuclear power plant or another facility while maintaining the fuel cell horizontally.

In the loading step, the fuel body 25 not stored in the protective container is directly inserted into the basket hole 13 for loading. In the transfer step, the two inner surfaces of the basket hole 13 in contact with the fuel body 25 are placed under the fuel body 25. The fuel body 25 is supported on the inner surface of the two V-shaped basket holes 13 and the fastening plate 15 of the lashing device installed on the two basket hole walls above the fuel body 25 from two directions. The fuel body 25 is pressed to be tightened and secured, and in this secured state, the fuel body 2
5 is transferred.

FIG. 11 shows a third embodiment of the reactor fuel transport container according to the present invention. The reactor fuel transport container shown in this embodiment has one solid fuel tank in each basket hole 13. The fuel transport container 1 according to the second embodiment includes a binding device 33.
Since it is not different from 0B, the same reference numerals are given and the description is omitted.

The fuel transport container 10C shown in FIGS. 11A and 11B has the basket hole element 12 provided with one securing device 33. The securing device 33 is installed on the basket hole wall at the upper corner when the fuel transport container 10C is set in the horizontal position. Fuel transport container 10C
Is formed by connecting a large number of basket hole elements 12 with a connecting body to integrate them. Each basket hole element 12 constituting the basket 11 is shown in FIG.
All of them are arranged in the same direction as the basket hole elements 12 shown in FIG. FIG. 11A shows one basket hole element 1 in a state where the fuel transport container 10C is placed horizontally.
FIG. 11 (B) shows a mounting example of a securing device 33 provided in the basket hole element 12.

In the fuel transport container 10C, when the fuel transport container is horizontally placed at the time of transfer, the basket hole 13 of the basket 11 constitutes a fuel body storage chamber. Basket 1
In one basket hole 13, two inner surfaces of the basket hole 13 in contact with the fuel body 25 are located below the fuel body 25, and both lower inner surfaces are inclined by about 45 degrees from the horizontal plane HP and V
The configuration in which the fuel body 25 is supported by both V-shaped inner surfaces of the V-shape is not different from the fuel transport container 10B shown in the second embodiment. The inclination from the horizontal plane HP is preferably about 45 degrees in terms of balance, but is not necessarily limited to this. For example, the inclination may be in the range of 30 degrees to 60 degrees.

The fuel transport container 10C is basically different from the second embodiment in that one securing device 33 is provided at the upper corner of the basket hole element 12, and the basket hole is driven by the securing device 33. A plurality of tightening plates 34 each having a rectangular shape or an L-shaped cross-section and distributed and arranged at appropriate intervals in the longitudinal direction of 13 are provided. The lashing device 33 includes a plurality of tightening plates 34, a driving unit 35 based on a small jack principle for driving the respective tightening plates 34 forward and backward, and a driving unit 35.
And a rotating shaft 36 for driving the rotating shaft 36. By rotating the rotating shaft 36, each of the tightening plates 34 is projected from the corner of the basket hole 13 to move the MOX fuel body 25 in one direction.
For example, it is pressed downward to tighten and secure.

By driving the securing device 33, each of the tightening plates 34 arranged at intervals in the longitudinal direction of the basket hole 13.
Are driven forward and backward synchronously. The lashing device 33 is shown in FIG.
As shown in (A), the storage plate is moved back and forth between a storage position shown by a solid line and a tightening position shown by a broken line.
The two adjacent lower V-shaped inner surfaces and the respective tightening plates 34 are tightened and fastened.

In the fuel transport container 10C shown in FIG. 11, the transport of the MOX fuel body as the light water reactor fuel is performed as follows.

In the method of transporting nuclear fuel using the fuel transport container 10C, a loading step of setting the fuel transport container 10C in a vertical position and loading a mixed oxide fuel body (MOX fuel body) 25, There is provided a transfer step of setting the transport container 10C in a horizontal position and transferring the fuel from each fuel facility to a nuclear power plant or another facility. In the loading step, the fuel body 25 is directly loaded into the basket hole 13 without using the protective container, and in the transfer step, the basket hole 1 in contact with the fuel body 25 is used.
The two inner surfaces 3 are lower sides of the fuel body 25, the lower inner side surfaces of the two V-shaped basket holes 1 support the fuel body 25, and the lower side is secured by a securing device 33 on the upper side of the fuel body 25. The fuel body 25 is fastened and fastened in the direction, and the fuel body 25 is transported in this fastened state.

Next, the operation and effect of the fuel transport containers 10, 10B and 10C shown in the first to third embodiments will be described with reference to FIG.

(A), (B) and (C) of FIG.
FIG. 8 is an operational principle diagram showing a relationship between a fastening force from a securing device 33 and a fastening direction in each of the fuel transport containers 10, 10B, and 10C shown in the first to third embodiments. FIGS. 11A, 11B and 11C show the first
This is a simplified system of securing the fuel body 25 in the embodiment to the third embodiment.

In each securing method of each embodiment, the fuel body 25 secured with the fastening force f
The maximum acceleration that starts sliding or moving within 3
5 can be calculated using a mass point system model in which the mass point is regarded as a mass point. Actually, the fuel body 25 is not a mass point, but mass point model calculation which is a guide for obtaining a required tightening force with respect to an assumed acceleration is effective.

For example, the fuel body 25 in the first embodiment
When the leftward acceleration is applied, the limit acceleration γc is

Γc = Gμ + f / M (1 + 2μ) Here, μ is a friction coefficient between the fuel body 25 and a member in contact with the fuel body 25, and is assumed to be the same value regardless of the type of the member. Used.

FIG. 13 shows the calculation result of the limit acceleration γc. FIG. 13A shows the upper limit acceleration, and FIG. 13B shows the lateral limit acceleration.

The acceleration acting on the fuel body 25 during transportation differs depending on transportation conditions, but generally the lateral acceleration is the largest, followed by the vertical direction and the longitudinal direction. Therefore, it is an important point of securing that the fuel body 25 is sufficiently firmly restrained in the lateral direction.

As shown in FIG. 13A, the upward limit acceleration curves 38a, 38b, and 38c do not differ greatly from the three cases shown in the first to third embodiments. That is, the upward limit acceleration is 1 G when the tightening force f is 0,
It increases proportionally with an increase in the tightening force f.

On the other hand, the lateral limit acceleration curves 39a, 39b, 39c in FIG. 13B have a great difference between the first embodiment and the securing of the fuel bodies shown in the second and third embodiments. . In the securing method of the fuel body 25 of the first embodiment,
For example, if the fuel body 25 is tightened with a tightening force f equivalent to 1 MG, the fuel cell 25 is stable against a lateral acceleration of, for example, about 2 G. However, if the tightening force f is loosened and halved, for example, 1. The fuel body 25 starts to move at a lateral acceleration of about 2G. Therefore, in the case of the securing system of the first embodiment, it is indispensable to prevent the tightening force f from being loosened.
As a specific countermeasure for preventing loosening, there is a method of pressing the fastening plate 15 via an elastic member such as a spring.

On the other hand, in the securing method of the fuel body 25 of the second and third embodiments, even if the fastening force f becomes zero, the lateral acceleration of about 1.8 G is stably maintained. I have.
Therefore, a very large tightening force f is not required, and no particular measures are required to prevent loosening.
33 can be made smaller and more compact than in the first embodiment. This is an effect because the fuel body 25 is supported by the inner wall of the V-shaped basket hole.

As described above, the securing method of the fuel body 25 of the second and third embodiments does not require an excessively large fastening force f or a measure for loosening the fastening force f. The securing devices 14 and 33 can be made smaller and more compact than the securing method of the fuel body 25. For this reason,
It is possible to provide more compact and large-capacity fuel transport containers 10B and 1C and a transport method.

When the second embodiment and the third embodiment are compared, they have substantially similar functions, but the securing devices 14 and 33
In the second embodiment, the number of fuel cells is two per fuel body, whereas in the third embodiment it is as small as one. Therefore, when the securing method of the fuel body 25 of the third embodiment is adopted, the fuel transport container 1
It is easy to further contribute to the downsizing and large capacity of 0B and 10C.

FIGS. 14 to 17 show a fourth embodiment of a reactor fuel transport container according to the present invention.

The fuel transport container 10 shown in this embodiment
14D, FIGS. 14A and 14B are partial views of the basket hole element 12 showing a horizontal state of the fuel transport container 10D during transfer. 14A and 14B show an example of one basket hole element 12, all other basket hole elements 12 are arranged in the same direction, and each basket hole element 12 is connected by a connecting member. Then, the basket 11 is configured by being integrated. Basket 1
1 is provided with basket holes 13 forming fuel body storage chambers in each basket hole element 12.

At the time of transfer, when the fuel transport container is placed horizontally,
Two adjacent inner surfaces of the basket hole 13 in contact with the fuel body 25 are below the fuel body 25, and both lower inner surfaces are inclined at, for example, about 45 degrees from the horizontal plane HP to form a V-shape. The rectangular tubular fuel body 25 is supported by a V-shaped basket hole inner wall. In the longitudinal direction, the fuel transport container 10D and the basket hole element 12 have the bottom side facing downward and the top side facing upward.
It is arranged at an angle β from P.

The inclination angle β is generally a gentle value, for example, around 30 degrees. The fuel body 25 leans against the inner wall of the V-shaped basket hole 13 in a state in which the lower tie plate 26 is placed on the fuel body cradle 20 with the one-sided function in the inclined basket hole 13. Further, a spacer 40 for filling a gap is provided between the upper tie plate 28 and the inner wall of the basket hole 13 so as to be able to be taken in and out.

In the method of transporting nuclear fuel using the fuel transport container 10D, a loading step of loading the mixed oxide fuel body (MOX fuel body) 25 into the basket hole 13 with the fuel transport container 10D placed vertically. And a transfer step for transferring the fuel transport container 10D from each fuel facility to a nuclear power plant or another facility with the fuel transport container 10D placed in a horizontal state.

In the loading step, the fuel container 25 is loaded into each basket hole 13 of the basket 11 without the need for a protective container.
The two inner surfaces adjacent to each other 3 are defined as the lower side of the fuel body 25, and both lower inner surfaces are inclined at about 45 degrees from horizontal to form a V-shape. Fuel body 2
5 is supported. The fuel transport container 10D is also provided in a state of being inclined such that the bottom side of the fuel transport container 10D faces downward and the top side faces upward in the longitudinal direction. The traveling direction at the time of transfer is the bottom direction in the longitudinal direction, that is, from left to right in FIG.

The examples shown in FIGS. 14A and 14B are for the case where the speed of the transfer means such as a trailer is relatively low, or the case where the transfer means having a relatively large vibration damping effect is used. The present invention relates to a fuel transport container 10D and a transport method in a case where vibration conditions due to transport are relatively low.

As described with reference to FIG.
When 5 is supported on the inner wall of the V-shaped basket hole, the fuel body 25 is very stable against lateral acceleration. The upward acceleration is stable up to 1G. In the case of transfer by a transfer means having a relatively low speed and a large vibration damping effect, the generated acceleration in the vertical direction is often a value of 1 G or less.

However, in a crane operation or the like, an upward acceleration of 1 G or more may occur momentarily. 1G
In order to prevent the fuel body 25 from jumping up in the basket hole 13 when the above upward acceleration acts, the lower tie plate 26 is provided by the fuel body cradle 20 and the upper tie plate 28 is provided by the spacer 40. Holding down. Therefore, even if the upward acceleration acts by 1 G or more, jumping is prevented.

The fuel transport container 10 shown in the fourth embodiment
In D, since no tightening force is applied to the fuel body 25, there is a problem whether the fuel body 25 does not start moving due to the longitudinal acceleration. In FIGS. 14A and 14B, the traveling direction of the fuel transport container 10D during transfer is from left to right.
Even if a relatively large acceleration occurs in the traveling direction, the fuel body 25 does not start moving due to the presence of the fuel body cradle 20.

By the way, when the transfer means applies a sudden brake, an acceleration in a direction opposite to the traveling direction may be generated by the reaction of the brake. Although the size is considered to be at most about 0.8 G, it may be about 1 G in some cases. FIG. 15 shows a mass point system model for calculating the stability of the fuel body 25 against such acceleration due to the brake reaction.
Shown in The meanings of the symbols shown in FIG. 15 are the same as those in FIG. FIG. 16 shows the calculation result of the mass point model. From FIG. 16, it can be seen that if the inclination angle β is about 30 degrees, even if an acceleration opposite to the traveling direction of about 1 G occurs, the fuel body does not slip out.

The fuel transport container 10 shown in the fourth embodiment
D and the transportation method are examples suitable for the case where transportation conditions are relatively moderate. The fuel device 25 is supported by the inner wall of the V-shaped basket hole and inclined in the longitudinal direction to secure the lashing device 14, Since the fuel transport container 33 is unnecessary, a very compact and large-capacity fuel transport container and a large number of fuel bodies 25 are required.
Can be provided at the same time.

The fuel transport container 10 shown in the fourth embodiment
As shown in FIGS. 17A and 17B, if D is provided with a securing device in accordance with the fuel transport container 10B of the second embodiment, it can be applied stably even under more severe transport conditions. Needless to say. FIG. 18 shows a fifth embodiment of a reactor fuel transport container according to the present invention.

The transport container for the reactor fuel shown in this embodiment has a protective container 41 for the MOX fuel body stored in the basket hole 13 of the basket 1 and a protective container 41 for storing the fuel body (not shown) in the basket hole 13. Is formed in the storage room.

The fuel transport container 10E has a basket 11 housed in a cylindrical transport container body 16, and the basket 11 is formed by connecting a large number of basket hole elements 12 by connecting members. . FIGS. 18A and 18B are diagrams showing the fuel transport container 10E in a horizontal state at the time of transfer, and the basket hole elements 12 are arranged so as to face in the same direction.

The fuel transport container 10 shown in the fifth embodiment
In E, in the horizontal state at the time of transfer, the basket hole 13 of the basket 11 forms a storage chamber of the protection container 41 that stores a fuel body (not shown). The side surface is the lower side of the protective container 41, and both lower inner surfaces are inclined, for example, at about 45 degrees from the horizontal plane HP to form a V-shape, and the bottom of the fuel transport container 10E also in the longitudinal direction. It is inclined at an angle β with the side facing downward and the top side facing upward. This inclination angle β is, for example, approximately 30 degrees.

The fuel transport container 10 shown in the fifth embodiment
In E, the reactor fuel is transported by loading the mixed oxide fuel body (MOX fuel body) with the fuel transport container in a vertical position, and loading each fuel facility by placing the fuel transport container 10E in a horizontal state. And a transfer process for transfer from the plant to a nuclear power plant or another facility. In the loading step, the fuel body stored in the protective container 41 is loaded into the basket hole 13, and in the transfer step, the two inner surfaces of the basket hole 13 that are in contact with the protective container 41 are set to the lower side of the protective container 41, and
The lower inner surfaces are inclined at approximately 45 degrees from the horizontal plane HP to form a V-shape, and the lower inner surfaces of the V-shape support the protective container 41 and also transport fuel in the longitudinal direction. The container 10E is set in an inclined state with the bottom side facing downward and the top side facing upward for transfer.

The fuel transport container 10 shown in the fifth embodiment
E and the transportation method use exactly the same configuration and method as in the fourth embodiment except that the fuel body is accommodated in the protective container 41 and transported, and provide the same effects as in the fourth embodiment. Since the fuel body 25 is housed in the protection container 41 with the protection state, it is possible to suppress the wear of the metal contact portion of the fuel body due to the minute vibration.

FIG. 19 shows a sixth embodiment of the reactor fuel transport container according to the present invention.

The transport container for nuclear reactor fuel shown in this embodiment has an intermediate member having a thermal expansion coefficient substantially equal to that of the fuel body 25 as a thermal expansion absorbing means capable of absorbing the thermal expansion of the fuel body 25 in the basket hole 13 of the basket 11. 44 are installed. Other configurations are not different from those shown in any of the first to third embodiments, and thus the same reference numerals are given and the description is omitted.

The fuel transport container 10F shown in FIG.
In the basket hole 13 of the basket 11, at least on two inner surfaces in contact with the fuel body 25, a zirconium alloy having a thermal expansion coefficient substantially equal to that of the fuel body 25 or a plate-like intermediate member 44 having a thermal expansion coefficient substantially equal to that of the zirconium alloy. The intermediate member 44 is installed on the inner wall of the basket hole 13 so as to be able to expand and contract in the longitudinal direction with the use of an idiot-hole bolt or the like. The basket 11 is constructed by integrally connecting a number of basket hole elements 12 with a connecting member (not shown).

For transporting the reactor fuel using the fuel transport container 10F of the sixth embodiment, a loading step of loading the MOX fuel body 25 with the fuel transport container 10F in a vertical position,
It basically includes a transfer step of transferring the fuel transport container 10F from the fuel facilities to the nuclear power plant or another facility with the fuel transport container 10F placed in a horizontal state.

Further, in the transportation method of the present invention, in the loading step, a zirconium alloy or a plate-like plate having a similar linear expansion coefficient to at least two inner surfaces of the basket hole 13 of the basket 11 in contact with the fuel body is provided. Of the fuel transport container 10F in which the intermediate member 44 is installed in such a manner that the intermediate member 44 can be extended and contracted in the longitudinal direction with respect to the basket hole wall by, for example, bolting with a stupid hole.
3, the fuel body 25 is directly loaded. In the transfer step, the inside of the basket hole in which the intermediate member 44 such as a zirconium alloy is installed is transferred under the fuel body 25.

Since the MOX fuel body 25 has an exothermic property,
The temperature inside the fuel transport container 10F becomes high and the basket hole element 1
A difference in elongation occurs between the fuel body 2 and the fuel body 25 due to a difference in thermal expansion. When the fuel body 25 is strongly fastened and secured by the securing device 14, the fuel spacer 30 or the transport separator 31 at the fastening portion of the fastening plate may be displaced, and the fuel body 25 may be in trouble. .

The fuel transport container 10 shown in the fifth embodiment
In F, the intermediate member 12 having the same linear expansion coefficient as the fuel body 25 is installed between the fuel body 25 and the inner surface of the basket hole 13 in contact with the fuel body 25 so as to be able to expand and contract with respect to the basket hole wall. It is.

Therefore, a difference in extension occurs between the intermediate member 44 and the inner wall of the basket hole 13, but the intermediate member 44
There is no difference in elongation between the fuel and the fuel body 25. In addition, since the intermediate member 44 below the fuel body 25 supports the fuel body 25 during transfer, the frictional force between the fuel body 25 and the intermediate member 44 and the frictional force between the fuel body 25 and the fastening plate 15 are compared. if you did this,
The former is overwhelmingly large. Therefore, when the fuel body 25 is placed on the plate-like intermediate member 44 having no difference in extension, slip occurs at the contact portion between the fuel body 25 and the tightening plate 15, and the fuel spacer 30 as the tightening portion and the transport The displacement of the separator 31 can be prevented.

The fuel transport container 10F of the sixth embodiment solves the problem of the difference in thermal expansion between the fuel body 25 and the basket 11 when the temperature is high, and provides a fuel transport container 10F and a transportation method that can transport the fuel body 25 soundly. Can be provided.

FIG. 20 shows a seventh embodiment of the reactor fuel transport container according to the present invention.

The transport container for nuclear fuel shown in this embodiment includes a plate-like intermediate member 44 as a thermal expansion absorbing means having a thermal expansion coefficient substantially equal to the thermal expansion coefficient of the fuel body 25 in the basket hole 13 of the basket 11, and the fuel body 25. And a plate-like cushioning material 45 as a cushioning means for reducing the impact force acting on the plate. Fuel transport container 10G
The basket 11 is formed by integrally connecting a rectangular cylindrical basket hole element 12 with a connecting member (not shown). FIG. 20 is a longitudinal sectional view showing the fuel transport container 10G in a horizontal state. Each basket hole 13 of the basket 11
Are all arranged in the same direction.

In the fuel transport container 10G, a plate-like buffer material 45 made of a honeycomb material, a rubber material, a resin material, or the like is provided on at least two surfaces of the basket hole 13 of the basket 11 in contact with the fuel body 25. Further, a zirconium alloy or an intermediate member 44 of a plate member having the same linear expansion coefficient as that of the zirconium alloy is provided.

In the method for transporting nuclear fuel using the fuel transport container 10G, the loading step of loading the MOX fuel body 25 with the fuel transport container 10G in the vertical position and the loading process of the fuel transport container 10G in the horizontal position are described. And a transfer step for transferring from each fuel facility to a nuclear power plant or another facility.

In the loading step, at least two inner surfaces of the basket hole inner surface which are in contact with the fuel body 25 are provided with a honeycomb material,
A buffer material 45 such as a rubber material or a resin material is installed alone or together with the intermediate member 44, and the fuel transport container 10G in which the buffer material 45 is installed does not require a protective container, and the fuel body 25 is directly loaded. In the transfer step, the transfer is performed with the inner side of the basket hole in which the cushioning material 45 is installed as the lower side.

In the fuel transport container of this embodiment,
A cushioning material 45 is provided on the inner surface of the basket hole below the fuel body 25 during transfer. This absorbs the micro-vibration, so that the wear of the metal contact portion of the fuel body 25 due to the micro-vibration can be suppressed.

[0124]

According to the container for transporting nuclear fuel and the method for transporting the same according to the present invention, the problem of misalignment when the fuel body is directly stored in the basket hole without being stored in the protective container is solved. The lashing system uses a small lashing device that can effectively and sufficiently exert the lashing effect with a small tightening force.
It is possible to provide a method of transporting nuclear fuel, which can improve the soundness and reliability of fuel transportation, transport a compact and large-capacity nuclear fuel transport container and a large number of fuel bodies at the same time, and reduce transport costs.

Further, in the container for transporting nuclear reactor fuel and the method for transporting the same according to the present invention, the fuel body is directly accommodated in the basket hole, and the maximum securing effect is obtained with a small fastening force by a small securing device. Since the problem of thermal expansion difference can be exhibited, a large number of light water reactor fuels such as mixed oxide fuel can be efficiently and stably transported simultaneously, and the transportation cost can be reduced.

Further, when the protective container containing the fuel body is accommodated in the basket hole of the basket, the securing device can be dispensed with, and the fuel transport container can be reduced in size and size. Even if the fuel cell is reduced in size and size, a large number of fuel bodies can be transported at the same time, and the transportation cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a fuel transport container according to a first embodiment of the present invention, showing a fuel transport container.

FIG. 2 is a longitudinal sectional view showing a first embodiment of a nuclear reactor fuel transport container according to the present invention.

FIG. 3A is a plan view showing a first embodiment of a nuclear reactor fuel transport container according to the present invention in an upright position, and FIG. 3B is a first embodiment of a nuclear reactor fuel transport container according to the present invention. FIG. 3 is a vertical sectional view showing the configuration in a horizontal state.

FIG. 4 is a longitudinal sectional view showing the first embodiment of the nuclear reactor fuel transport container according to the present invention and showing a loaded state of a fuel body.

FIG. 5 is an explanatory view of a transportation method showing a first embodiment of a nuclear reactor fuel transport container according to the present invention.

FIG. 6 is an explanatory view of a transportation method showing a first embodiment of a nuclear reactor fuel transport container according to the present invention.

FIGS. 7A and 7B are a plan view and a longitudinal sectional view showing a general reactor fuel transport container.

FIGS. 8A and 8B are explanatory views showing the effect of a general nuclear fuel transport container and the effect of the nuclear fuel transport container in the first embodiment.

FIG. 9 is a view showing a modification of the first embodiment of the reactor fuel transport container according to the present invention.

FIG. 10 is a plan view of a second embodiment of a transport container for nuclear fuel according to the present invention, showing a basket hole element.

FIGS. 11A and 11B show a third embodiment of a reactor fuel transport container according to the present invention, and are partial views of basket hole elements.

FIG. 12 is an explanatory diagram showing the effects of the fuel transport containers of the first to third embodiments in comparison;

FIGS. 13 (A) and (B) show the third embodiment from the first embodiment.
Explanatory drawing which compares and shows the effect of the fuel transport container shown in embodiment.

FIGS. 14A and 14B show a fourth embodiment of a reactor fuel transport container according to the present invention, and show basket hole elements of the fuel transport container, respectively.

FIG. 15 is an explanatory diagram showing an effect of the fourth embodiment of the reactor fuel transport container according to the present invention.

FIG. 16 is an explanatory diagram showing an effect of the fourth embodiment of the reactor fuel transport container according to the present invention.

17A and 17B are views showing a fifth embodiment of a reactor fuel transport container according to the present invention, respectively.

18 (A) and (B) are basket diagrams of a fuel transport container showing a fifth embodiment of a reactor fuel transport container according to the present invention, respectively.

FIG. 19 is a sectional view of a basket hole element constituting a fuel transport container according to a sixth embodiment of the reactor fuel transport container according to the present invention.

FIG. 20 is a sectional view of a basket hole element constituting a fuel transport container according to a seventh embodiment of the reactor fuel transport container according to the present invention.

[Explanation of symbols]

10, 10A, 10B, 10C, 10D, 10E, 10
F, 10G Fuel transport container 11, 11A Basket 12 Basket hole element 13 Basket hole 14 Fastening device 15 Tightening plate 16 Transport container body 17 Drive unit 18 Rotary shaft 19 Tightening adjustment shaft 20 Fuel body receiving stand 21 Fuel body receiving unit Reference Signs List 22 Conical portion (Fuel body shifting guide) 23 Fuel body receiving recess 24 Guide groove 25 MOX fuel body (light water reactor fuel, fuel body) 26 Lower plate 27 Trifurcated protrusion 28 Upper tie plate 29 Fuel rod 30 Fuel spacer 31 For transportation Separator 33 Fastening device 34 Tightening plate 35 Drive unit 36 Rotating shaft 40 Spacer 41 Protective container 44 Intermediate member (thermal expansion absorbing means) 45 Buffer material (buffering means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G21F 5/008 G21F 5/012 G21C 3/00

Claims (15)

(57) [Claims] A fuel transport container includes a basket having a large number of basket holes for accommodating a fuel body, and the fuel body is fastened to each basket hole in two directions or one direction except for an opposing direction common to all basket holes. When a securing device for restraining is installed and the fuel transport container at the time of loading the fuel body is placed vertically, the basket moves in one direction in the diagonal direction when the fuel body fastening direction is two directions. In this case, the transport axis of the reactor fuel is characterized in that the basket axis is inclined in that direction from the vertical axis or the transport vessel main body accommodating the basket is inclined in the diagonal direction or in one direction. 2. A fuel body receiving table with a biasing function is fixed to the bottom of each basket hole of a basket storing a fuel body, and the fuel body receiving table is positioned at a position of the fuel body to be biased by tightening. A fuel container for transporting a nuclear reactor, comprising a body receiving portion, and a conical or tapered fuel body shifting guide provided on an upper side of the fuel body receiving portion. 3. When the fuel transport container is placed in a horizontal position during transfer, two adjacent inner surfaces of a basket hole in contact with a stored fuel body are located below the fuel body, and the lower two inner faces are located inside the fuel hole. V whose side is inclined about 45 degrees from horizontal
Forming a V-shape, supporting the fuel body on both inner surfaces of the V-shape, and securing the fuel body in two directions by a securing device installed on the two basket hole walls on the upper side of the fuel body A transport container for nuclear reactor fuel. 4. When the fuel transport container is placed in a horizontal position during transfer,
The basket has a V-shape in which two adjacent inner surfaces of a basket hole that is in contact with the stored fuel body are the lower side of the fuel body, and both lower inner surfaces are inclined at about 45 degrees from horizontal, A fuel container for transporting a nuclear reactor, wherein a fuel body is supported on both inner surfaces of a V-shape, and the fuel body is fastened and secured in one downward direction by a securing device installed on an upper basket hole wall. . 5. When the fuel transport container is placed in a horizontal position during transfer, two adjacent inner surfaces of a basket hole in contact with a stored fuel body are located below the fuel body, and the lower two inner faces are provided. V whose side is inclined about 45 degrees from horizontal
A reactor container for transporting nuclear fuel, wherein the container is formed in a shape of a letter, and is inclined in the longitudinal direction of the basket with the bottom side of the fuel transport container facing downward and the top side facing upward. 6. A zirconium alloy or an intermediate member having a linear expansion coefficient similar to that of this alloy is provided on at least two inner surfaces of the inner surface of the basket hole which are in contact with the fuel body.
The reactor fuel transport container according to any one of claims 1 to 5, wherein the reactor fuel transport container is installed so as to be able to extend and contract in a longitudinal direction with respect to a basket hole wall. 7. The nuclear reactor according to claim 1, wherein a buffer material such as a honeycomb material, a rubber material, and a resin material is provided on at least two inner surfaces of the inner surface of the basket hole which are in contact with the fuel body. Transport container for fuel. 8. When the fuel transport container is placed in a horizontal position at the time of transfer, the protective container accommodating the fuel body is accommodated in the basket hole, and comes into contact with the protective container accommodated in the basket hole.
One inner surface is the lower side of the protective container, and both inner surfaces form a V-shape inclined at about 45 degrees from horizontal, and the bottom side of the fuel transport container is also directed downward in the longitudinal direction of the basket, and the top side is A container for transporting nuclear fuel characterized by being inclined upward. 9. A process of loading a light water reactor fuel such as a mixed oxide fuel body with the fuel transport container being placed vertically, and a process of placing the fuel transport container in a horizontal position from each fuel facility to a nuclear power plant or another facility. In the method for transporting nuclear reactor fuel, the transporting step includes, in the loading step, a securing device for each basket hole of the basket, in which two basket holes common to all the basket holes are inwardly directed from two inner surfaces facing each other, or When tightening and constraining the fuel body in one direction inward from one inner surface of the basket hole, the basket is in the diagonal direction when the fuel body tightening direction is two directions and in the diagonal direction when the fuel body is tightened in one direction. With the basket axis inclined from the vertical axis, the fuel body is hung vertically into the basket hole and inserted, and the insertion end of the fuel rod is inserted at the same time. Biased guide to function with fuel body cradle finished biased to both the inner surface of the fuel assemblies of the basket hole,
Thereafter, the fuel body is fastened in the diagonal direction or one direction by a fastening device and fastened, and directly loaded, while the fuel transport container is placed sideways in the transfer step in which the fuel body fastening direction is one direction. A method for transporting nuclear fuel, wherein the lashing device is transported in a state where the securing device is located above or beside the basket hole in both directions. 10. A step of loading a light water reactor fuel such as a mixed oxide fuel body with the fuel transport container placed vertically, and a step of placing the fuel transport container horizontally to transfer from each fuel facility to a nuclear power plant or another facility. In the method for transporting nuclear reactor fuel, the method further comprises the step of loading the fuel body directly into the basket hole in the loading step, and the step of transferring the two inner surfaces of the basket hole in contact with the fuel body in the transfer step. Side, and both lower inner surfaces are inclined at approximately 45 degrees from horizontal to form a V-shape, and the fuel body is supported by both V-shaped inner surfaces, and the upper two A method for transporting nuclear fuel, wherein fuel is transported in a state of being fastened and fastened in two directions by a fastening device installed on a wall of a basket hole. 11. A step of loading a light water reactor fuel such as a mixed oxide fuel body with the fuel transport container placed vertically, and a step of placing the fuel transport container horizontally to transfer from each fuel facility to a nuclear power plant or another facility. In the method for transporting nuclear reactor fuel, the method further comprises the step of loading the fuel body directly into the basket hole in the loading step, and the step of transferring the two inner surfaces of the basket hole in contact with the fuel body in the transfer step. And a V-shaped shape formed by inclining both lower inner surfaces by approximately 45 degrees from horizontal, and supporting the fuel assembly on both V-shaped inner surfaces, and forming an upper basket of the fuel assembly. A method for transporting nuclear reactor fuel, comprising transporting a fuel body in a state where the fuel body is tightened and secured in one downward direction by a securing device installed on a hole wall. 12. A step of loading a light water reactor fuel such as a mixed oxide fuel body with the fuel transport container placed vertically, and a step of placing the fuel transport container horizontally to transfer from each fuel facility to a nuclear power plant or another facility. In the method for transporting nuclear reactor fuel, the method further comprises the step of loading the fuel body directly into the basket hole in the loading step, and the step of transferring the two inner surfaces of the basket hole in contact with the fuel body in the transfer step. Side, and both lower inner surfaces are inclined at about 45 degrees from horizontal to form a V-shape, and the V-shaped inner surfaces support the fuel body, and the bottom of the transport container also in the longitudinal direction. A method for transporting nuclear fuel, characterized in that the fuel is transported in an inclined state with the side facing downward and the top side facing upward. 13. A step of loading a light water reactor fuel such as a mixed oxide fuel body with the fuel transport container placed vertically, and a step of placing the fuel transport container in a horizontal position from each fuel facility to a nuclear power plant or another facility. In the method for transporting nuclear reactor fuel, which comprises a step of transporting, in the loading step, the fuel body accommodated in the protective container is loaded into the basket hole, and in the transporting step, two inner surfaces of the basket hole contacting the protective container are removed. The lower side of the protective container, and both lower inner surfaces are inclined at about 45 degrees from horizontal to form a V-shape, and the V-shaped inner surfaces support the protective container, and also in the longitudinal direction. A method for transporting nuclear fuel, wherein the transport container is transported in an inclined state with the bottom side facing downward and the top side facing upward. 14. In the loading step, a zirconium alloy having a thermal expansion coefficient substantially equal to that of the fuel body or an intermediate member having a linear expansion coefficient substantially equal to that of the zirconium alloy is provided on at least two inner surfaces of the inner surface of the basket hole which are in contact with the fuel body. ,
The basket is provided so as to be extendable and contractible in the longitudinal direction with respect to the basket hole wall, and the fuel body is directly loaded into the basket hole of the fuel transport container provided with the intermediate member, while the transfer step includes a basket provided with an intermediate member such as a zirconium alloy. 13. The method for transporting nuclear fuel according to claim 9, wherein the inner surface of the hole is transported downward. 15. In the loading step, the fuel body is directly transferred to a fuel transport container in which a buffer material such as a honeycomb material, a rubber material, or a resin material is provided on at least two inner surfaces of the basket hole inner surface that are in contact with the fuel body. While loading, in the transfer step,
13. The method according to claim 9, wherein the inner side of the basket hole in which the cushioning material is installed is transferred as a lower side of the fuel body.
15. A method for transporting nuclear fuel according to claim 14.