JP6143573B2 - Radioactive substance storage basket and radioactive substance storage container - Google Patents

Description

  The present invention relates to a radioactive substance storage basket and a radioactive substance storage container for storing, transporting and storing radioactive waste.

  Radioactive waste generated in a nuclear power plant nuclear reactor or the like is stored in a radioactive material storage container, transported to a storage facility or a reprocessing facility, and stored or reprocessed. Such a radioactive substance storage container is fixed to the upper part of the trunk part having a cylindrical shape with a bottom with an open top, a basket having a plurality of cells capable of individually accommodating a plurality of radioactive wastes. And a lid portion.

  As a conventional radioactive substance storage container, for example, a metal sealed container for radioactive substance described in Patent Document 1 has a plurality of elongated loading parts (cells) having a rectangular cross section extending along the axial direction of the container body. A radioactive substance aggregate formed into a square column as a whole is inserted into the loading part, and the radioactive substance aggregate is inserted into the radial gap between the radioactive substance aggregate and the basket in the loading part. A buffer member for preventing a collision between the substance assembly and the basket is provided.

  Moreover, as a conventional radioactive substance storage container, for example, a radioactive substance receiving apparatus described in Patent Document 2 has a central cylindrical hole (cell) in which a fuel element having a cylindrical outline or a cylindrical liner is received. A plurality of prismatic elements are fixed in parallel.

JP 2004-101538 A JP-A 63-289495

  Like the metal sealed container for radioactive substances described in Patent Document 1 and the radioactive substance receiving device described in Patent Document 2, the cells of the basket have a cross-sectional shape that matches the shape of the radioactive substance. It is common. As shown in Patent Document 1, since a cell having a rectangular cross section can be formed of a plate material having a uniform thickness, it is relatively easy to manufacture and can be formed to have a relatively light weight. On the other hand, as shown in Patent Document 2, in the case of a cylindrical cell, it is easy to fix a plurality of elements in parallel by making the outer shape into a prismatic shape, but since the thickness is not uniform, the manufacturing is difficult and the thickness is There is a problem that the weight is increased at a thick portion.

  Therefore, for example, if a radioactive substance having a cylindrical shape shown in Patent Document 2 is received in a cell having a rectangular cross section shown in Patent Document 1, the radioactive material is contained in the fuel cladding tube as shown in Patent Document 1. When the fuel rod is made up of a large number of elongated fuel rods that contain fuel, and the fuel rods are bundled together, the fuel rods are bundled by an external force that is crushed in the vertical direction when an accident event falls. The form may change (for example, the distance between the fuel rods may be displaced), increasing the risk that the subcriticality that prevents the radioactive material from entering a critical state is reduced.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a radioactive substance storage basket and a radioactive substance storage container that are light in weight, easy to manufacture, and capable of preventing damage to radioactive substances.

  In order to achieve the above object, a radioactive substance storage basket according to the present invention comprises a basket body, a plurality of radioactive substance storage parts formed in parallel to the basket body at predetermined intervals, and the radioactive substance storage part. A guide portion that is inserted into the compartment and adjusts the compartment shape of the radioactive material storage portion to the external shape of the radioactive material so as to house a radioactive material having a different external shape with respect to the internal shape of the radioactive material storage portion. It is characterized by providing.

  According to this radioactive substance storage basket, the guide part adjusts the shape of the compartment of the radioactive substance storage part to the external shape of the radioactive substance, so that in the event of an accident event, the radioactive rod is shaped into a bundle of many fuel rods. In order to suppress a situation in which the bundled shape is changed by an external force by which the material is crushed in the vertical direction, it is possible to improve subcritical performance that prevents the radioactive material from becoming a critical state. Moreover, since the guide part is inserted into the compartment of the radioactive substance storage part and matches the inner shape of the radioactive substance storage part to the outer shape of the radioactive substance, the radioactive substance storage part can be formed with a uniform thickness, so it is lightweight. And can be easily manufactured with good workability. In addition, since the guide part is inserted into the compartment of the radioactive substance storage part, and the inner shape of the radioactive substance storage part is matched to the outer shape of the radioactive substance, there is less space in the compartment of the radioactive substance storage part and the heat transfer performance is impaired. Therefore, the heat removal performance can be maintained.

  In the radioactive substance storage basket of the present invention, the radioactive substance storage part is formed in a rectangular shape in the compartment.

  According to this radioactive substance storage basket, by forming the compartment shape of the radioactive substance storage part into a rectangular shape, the workability is improved and the effect of facilitating the manufacture can be remarkably obtained. Further, a general radioactive substance has a rectangular outer shape, and a rectangular compartment-shaped radioactive substance storage unit that matches the outer shape of the radioactive substance is also generally used. Therefore, by providing a guide part using the general radioactive substance storage part of the rectangular inner compartment shape, the radioactive substance containing the outer shape different from the inner shape of the radioactive substance storage part is accommodated, and an accident is caused. In the event of falling, it is possible to suppress a situation in which the bundled state is changed due to an external force by which the radioactive substance is crushed in the vertical direction, and to improve the subcritical performance that prevents the radioactive substance from entering a critical state.

  Moreover, the radioactive substance storage basket of the present invention is characterized by having a neutron absorber provided along the inner surface of the radioactive substance storage part.

  According to this radioactive substance storage basket, it is possible to properly absorb neutrons emitted from the radioactive substance inserted inside the neutron absorber in the compartment of the radioactive substance storage part, and to improve the subcritical performance. Can do.

  In the radioactive substance storage basket of the present invention, the guide portion is formed as the neutron absorber.

  According to this radioactive substance storage basket, the guide part is formed as a neutron absorber, so that neutrons emitted from the radioactive substance inserted into the compartment of the radioactive substance storage part can be properly absorbed. Subcritical performance can be improved.

  The guide part is arranged continuously in the vertical direction of the radioactive substance storage part, and has a connecting part that connects the end part of the basket body in the vertical direction and the end part of the guide part. Features.

  According to this radioactive substance storage basket, the guide part can be positioned in the radioactive substance storage part of the basket body by connecting the guide part to the basket body by the connecting part. In addition, when the basket body is assembled from a plurality of plates and cylinders, a plurality of parts constituting the basket body can be formed by connecting the guide portions arranged in the adjacent radioactive substance storage portions with the connecting portions. Since the basket body is integrally formed without any deviation between the plate members or the tube members, the strength for housing the radioactive substance can be ensured.

  Further, in the radioactive substance storage basket of the present invention, the basket body is formed by stacking a plurality of plate materials and combining in a direction intersecting the stacking direction to define the radioactive substance storage part, and the guide part includes: It is arrange | positioned in the said radioactive substance storage part continuously in the direction where the said board | plate material is stacked | piled up, It has a connection part which connects the both ends where the said board | plate material was stacked | stacked, and the both ends of the said guide part.

  According to this radioactive substance storage basket, a plurality of plate members are stacked and combined in a direction intersecting the stacking direction to form a radioactive substance storage portion, whereby the basket body can be easily assembled. Moreover, the guide portions are stacked in the radioactive substance storage portion continuously in the direction in which the plate materials are stacked, and the connecting portions that connect the both ends of the plate materials and the both ends of the guide portions are stacked. Each plate member can be connected via a guide portion so as to be sandwiched between the upper and lower parts, and the basket body is integrally formed without shifting each plate member, so that the strength for storing the radioactive substance can be ensured.

  In the radioactive substance storage basket of the present invention, the basket body is made of carbon steel or stainless steel.

  According to this radioactive substance storage basket, it is possible to sufficiently ensure the strength for storing the radioactive substance.

  In the radioactive substance storage basket of the present invention, the guide portion is made of an aluminum alloy.

  According to this radioactive substance storage basket, the guide portion can be easily manufactured by extrusion, the weight can be reduced, and the heat transfer performance can be improved, so that the heat removal performance can be improved.

  In the radioactive substance storage basket of the present invention, the guide portion is subjected to a liquid-resistant surface treatment.

  According to this radioactive substance storage basket, water is injected into the pool for storing radioactive substances in order to absorb neutrons and prevent criticality between adjacent radioactive substances, and the radioactive substances are stored in the radioactive substance storage basket. When it is stored in the pool, it is immersed in the water of the pool. At this time, the durability of the guide portion with respect to the water of the pool can be improved.

  Moreover, in the radioactive substance storage basket of the present invention, the guide portion is subjected to a heat radiating surface treatment.

  According to this radioactive substance storage basket, the heat transfer performance of the guide portion is enhanced, so that the heat removal performance can be improved.

  Moreover, the radioactive substance storage basket of the present invention is characterized by having a cylindrical member that matches the outer shape of the radioactive substance.

  According to this radioactive substance storage basket, since the radioactive substance is surrounded by the cylindrical member, the form of the radioactive substance bundled in a shape in which a large number of fuel rods are bundled is changed by an external force that is crushed in the vertical direction. Can be further suppressed, and the subcritical performance can be further enhanced.

  In the radioactive substance storage basket of the present invention, the cylindrical member is a neutron absorber.

  According to this radioactive substance storage basket, it is possible to appropriately absorb neutrons emitted from the radioactive substance inserted inside the cylindrical member which is a neutron absorber, and to improve the subcritical performance.

  In the radioactive substance storage basket of the present invention, the cylindrical member is made of carbon steel or stainless steel.

  According to this radioactive substance storage basket, it is possible to sufficiently secure the intensity for storing the radioactive substance, and the radioactive substance having a shape in which a large number of fuel rods are bundled is bundled by an external force that is crushed in the vertical direction. It is possible to remarkably obtain the effect of further suppressing the situation in which the form is changed and further enhancing the subcritical performance.

  In the radioactive substance storage basket of the present invention, the cylindrical member is configured in multiple, at least one is a neutron absorber, and at least the other is made of carbon steel or stainless steel.

  According to this radioactive substance storage basket, it is possible to appropriately absorb neutrons emitted from the radioactive substance inserted inside the cylindrical member which is a neutron absorber, and to improve the subcritical performance. Moreover, according to this radioactive substance storage basket, the tubular member made of carbon steel or stainless steel can sufficiently secure the strength for storing the radioactive substance, and has a shape in which a large number of fuel rods are bundled. It is possible to remarkably obtain the effect of further suppressing the situation in which the bundled form is changed due to the external force by which the radioactive substance is crushed in the vertical direction and further improving the subcritical performance.

  In order to achieve the above object, the radioactive substance storage container according to the present invention includes a cylindrical body having an opening formed on one side and a closing part formed on the other side, and the opening so as to close the opening. It has a cover part which can be attached or detached with respect to a trunk | drum, and the said any one radioactive substance storage basket accommodated in the said trunk | drum.

  According to this radioactive substance storage container, by aligning the compartment shape of the radioactive substance storage part with the outer shape of the radioactive substance by the guide part of the radioactive substance storage basket, a large number of fuel rods are bundled in the event of an accident event falling. In order to suppress a situation in which the bundled shape is changed due to an external force in which the radioactive material having a deformed shape is crushed in the vertical direction, it is possible to improve the subcritical performance that prevents the radioactive material from entering a critical state. Moreover, since the guide part is inserted into the compartment of the radioactive substance storage part and matches the inner shape of the radioactive substance storage part to the outer shape of the radioactive substance, the radioactive substance storage part can be formed with a uniform thickness, so it is lightweight. And can be easily manufactured with good workability. If the radioactive substance storage basket is lightweight, the assembling work to the radioactive substance storage container itself is easy, and the radioactive substance storage container itself is reduced in weight to improve portability. If manufacturing of the radioactive substance storage basket is easy, the manufacturing cost of the radioactive substance storage basket and the radioactive substance storage container itself can be reduced. In addition, since the guide part is inserted into the compartment of the radioactive substance storage part, and the inner shape of the radioactive substance storage part is matched to the outer shape of the radioactive substance, there is less space in the compartment of the radioactive substance storage part and the heat transfer performance is impaired. Therefore, the heat removal performance can be maintained.

  According to the present invention, it is lightweight and easy to manufacture, and the radioactive material can be prevented from being damaged.

FIG. 1 is a side sectional view of a cask as a radioactive substance storage container according to an embodiment of the present invention. FIG. 2 is a plan sectional view of a cask as a radioactive substance storage container according to an embodiment of the present invention. FIG. 3 is a plan view of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 4 is a plan view of a modification of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 5 is a plan view of a modification of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 6 is a plan view of a modification of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 7 is a plan view of another example of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 8 is an assembled perspective view of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 9 is a plan view of another example of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 10 is a perspective view of another example of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 11 is a plan view of another example of the radioactive substance storage basket according to the embodiment of the present invention. FIG. 12 is a plan view of another example of the radioactive substance storage basket according to the embodiment of the present invention.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

  FIG. 1 is a side sectional view of a cask as a radioactive substance storage container according to this embodiment, and FIG. 2 is a plan sectional view of a cask as a radioactive substance storage container according to this embodiment.

  A cask 11 as a radioactive substance storage container includes a body part 12, a lid part 13, and a radioactive substance storage basket 14. The trunk portion 12 has a cylindrical shape in which an opening 22 is formed on one side of the trunk body 21, that is, an upper portion, and the bottom portion (blocking portion) 23 is formed on the other side, that is, a lower portion. For example, a spent fuel assembly) can be stored. That is, the trunk body 21 is provided with a cavity 24 inside, and the cavity 24 has a shape matching the outer peripheral shape of the radioactive substance storage basket 14. The radioactive substance storage basket 14 has a plurality of cells for individually storing a plurality of radioactive substances (not shown). Details of the configuration of the radioactive substance storage basket 14 will be described later. And the trunk | drum main body 21 has the bottom part 23 couple | bonded by welding to this lower part, and this trunk | drum main body 21 and the bottom part 23 are the forgings made from carbon steel which has a gamma ray shielding function. Stainless steel can also be used for the trunk | drum main body 21 and the bottom part 23 instead of carbon steel. The trunk body 21 and the bottom portion 23 can also be made of cast products such as spheroidal graphite cast iron and carbon steel cast steel.

  The body portion 12 is provided with an outer cylinder 25 with a predetermined gap on the outer peripheral side of the body main body 21, and transfers heat between the outer peripheral surface of the body main body 21 and the inner peripheral surface of the outer cylinder 25. A plurality of copper heat transfer fins 25a are welded at equal intervals in the circumferential direction. The body 12 is a resin (neutron shielding body) 26 containing boron or a boron compound which is a polymer material containing a large amount of hydrogen and has a neutron shielding function in the space between the body body 21 and the outer cylinder 25. Is injected and solidified through a pipe (not shown) in a fluidized state.

  The body 12 may have a bottom plate 28 connected to the lower side of the bottom 23 with a plurality of connecting plates 27 with a predetermined gap, and a resin (neutron) in a space between the connecting plate 27 and the bottom plate 28. A shield) 29 is provided. Furthermore, the trunnion 30 is fixed to the trunk | drum 12 in the predetermined position in an outer peripheral part.

  The lid 13 that closes the opening 22 of the trunk body 21 in the trunk 12 includes a primary lid 31 and a secondary lid 32. The primary lid portion 31 has a disk shape made of stainless steel or carbon steel that shields γ rays. The secondary lid portion 32 is also formed of a stainless steel or carbon steel disk, and a resin (neutron shield) 33 is enclosed therein. The primary lid portion 31 and the secondary lid portion 32 are detachably attached to the upper end portion of the trunk body 21 with stainless steel or carbon steel bolts (not shown). In this case, metal gaskets (not shown) are interposed between the primary lid portion 31 and the secondary lid portion 32 and the trunk body 21 to ensure the internal sealing performance. The resin 33 may be provided inside the primary lid 31 or may be provided only on the primary lid 31. In addition, an auxiliary shield 34 enclosing a resin may be provided around the lid portion 13.

  The radioactive substance storage basket 14 will be described in detail. FIG. 3 is a plan view of the radioactive substance storage basket according to the present embodiment, and FIGS. 4 to 6 are plan views of modified examples of the radioactive substance storage basket according to the present embodiment.

  As shown in FIGS. 3 to 6, the radioactive substance storage basket 14 includes a basket body 41, a radioactive substance storage part 42, and a guide part 43.

  The basket body 41 is configured by combining a plurality of plate materials in a lattice shape. Alternatively, the basket body 41 may be configured by bundling a plurality of cylindrical materials in parallel. As a result, as shown in FIGS. 1 and 2, the radioactive substance storage unit 42 as a cell in which each of the grid-like sections and the sections of each cylindrical body are arranged in parallel with each other at a predetermined interval is continued in the vertical direction. Formed. In addition, the basket main body 41 in which the plate materials are combined in a lattice shape and the basket main body 41 in which the cylindrical materials are bundled in parallel can be formed by arranging the radioactive substance storage portions 42 in a plane view like a grid. it can. Further, in the basket body 41 in which the cylindrical materials are bundled in parallel, the radioactive substance storage portions 42 can be partitioned and formed in a staggered manner in a plan view.

  As shown in FIGS. 3 to 6, the guide portion 43 has a radioactive substance in the compartment shape of the radioactive substance storage portion 42 so as to accommodate the radioactive substance 100 having a different external shape from the compartment shape of the radioactive substance storage portion 42. It is to match the 100 external shape.

  Here, the radioactive substance 100 has a spent fuel assembly as described above. The spent fuel assembly is formed by bundling a large number of fuel rods into a circular shape (see FIGS. 3 and 5) or a hexagonal shape (see FIGS. 4 and 6) by a support grid.

  In the present embodiment, the intra-compartment shape of the radioactive substance storage unit 42 is formed in a rectangular shape. Therefore, in the present embodiment, the rectangular inner compartment shape of the radioactive substance storage unit 42 is formed as a circular outer shape of the radioactive substance 100 as shown in FIGS. 3 and 5 or as shown in FIGS. 4 and 6. Match the hexagonal shape of the substance 100. The intra-compartment shape of the radioactive substance storage unit 42 is not limited to a rectangular shape. For example, when the inner compartment shape of the radioactive substance storage unit 42 is circular, it may be matched to the outer shape of the rectangular radioactive substance 100 or the outer shape of the hexagonal radioactive substance 100.

  In FIG. 3, the guide part 43 has four rectangular inner corner portions of the radioactive substance storage part 42 so that the rectangular inner compartment shape of the radioactive substance storage part 42 matches the circular outer shape of the radioactive substance 100. And has a corner portion 43a along the inner corner portion and an inner side surface 43b along the circular outer shape of the radioactive substance 100. This guide part 43 is provided along the up-down direction of the radioactive substance storage part 42. The guide portion 43 has a vertical length that is substantially the same as the vertical size of the radioactive substance storage portion 42. Moreover, the guide part 43 is provided with a hollow part 43c in order to reduce the weight.

  In addition, in FIG. 4, the guide portion 43 has four rectangular portions of the radioactive substance storage unit 42 so that the rectangular inner compartment shape of the radioactive substance storage unit 42 matches the hexagonal outer shape of the radioactive substance 100. And a corner portion 43a along the inner corner portion, and an inner side surface 43b along the hexagonal outer shape of the radioactive substance 100. This guide part 43 is provided along the up-down direction of the radioactive substance storage part 42. The guide portion 43 has a vertical length that is substantially the same as the vertical size of the radioactive substance storage portion 42. Moreover, the guide part 43 is provided with a hollow part 43c in order to reduce the weight.

  Further, in FIG. 5, the guide portion 43 has a cylindrical shape along the circular outer shape of the radioactive substance 100 so that the rectangular inner shape of the radioactive substance storage portion 42 matches the circular outer shape of the radioactive substance 100. Is formed. This guide part 43 is provided along the up-down direction of the radioactive substance storage part 42. The guide portion 43 has a vertical length that is substantially the same as the vertical size of the radioactive substance storage portion 42.

  Moreover, the guide part 43 is along the hexagonal external shape of the radioactive substance 100 so that the rectangular internal shape of the radioactive substance storage part 42 may be matched with the hexagonal external shape of the radioactive substance 100 in FIG. It is formed in a hexagonal cylinder shape. The guide portion 43 has a vertical length that is substantially the same as the vertical size of the radioactive substance storage portion 42.

  As shown in FIGS. 1 and 2, the radioactive substance storage basket 14 configured as described above is disposed in the trunk 12 constituting the cask 11. That is, the body 12 has a cavity 24 having a circular inner peripheral surface formed therein, and the radioactive substance storage basket 14 is disposed so as to be fitted into the cavity 24. At this time, the radioactive substance storage basket 14 is positioned with respect to the cavity 24 by a positioning member (not shown) to prevent rotation. The radioactive substance storage basket 14 has a plurality of radioactive substance storage portions 42 formed as cells and a guide portion 43 inserted therein, so that the outer shape of the radioactive substance storage portion 42 is different from the internal shape of the compartment. The radioactive material 100 can be accommodated. Thereafter, the lid portion 13 of the body portion 12 is fixed to the opening portion 22, whereby the plurality of radioactive substances 100 are sealed in the cask 11.

  As described above, the radioactive substance storage basket 14 according to the present embodiment includes the basket body 41, the plurality of radioactive substance storage parts 42 that are partitioned and formed on the basket body 41 at predetermined intervals, and the radioactive substance storage part 42. A guide part 43 that is inserted into the compartment and matches the outer shape of the radioactive substance storage unit 42 with the outer shape of the radioactive substance 100 so as to accommodate the radioactive substance 100 having a different outer shape with respect to the inner shape of the radioactive substance storage part 42; .

  According to the radioactive substance storage basket 14, the guide part 43 matches the inner shape of the radioactive substance storage part 42 with the outer shape of the radioactive substance 100, thereby bundling a large number of fuel rods in the event of an accident event falling. In order to suppress a situation in which the shape bundled by the external force that the shaped radioactive substance 100 is crushed in the vertical direction is changed (for example, the interval between the fuel rods is displaced), the radioactive substance 100 is in a critical state. Preventing subcritical performance can be enhanced. In addition, the guide part 43 is inserted into the compartment of the radioactive substance storage part 42, and in order to match the inner shape of the radioactive substance storage part 42 with the outer shape of the radioactive substance 100, the radioactive substance storage part 42 has a uniform thickness. Since it can be formed, the weight can be reduced, and the processability is good and the manufacturing can be facilitated. If the radioactive substance storage basket 14 is lightweight, the assembly work to the cask 11 as the radioactive substance storage container is easy, and the cask 11 is reduced in weight, thereby improving the portability. If manufacturing of the radioactive substance storage basket 14 is easy, the manufacturing cost of the radioactive substance storage basket 14 and the cask 11 can be reduced. In addition, since the guide part 43 is inserted into the compartment of the radioactive substance storage part 42 and the inside shape of the radioactive substance storage part 42 is matched with the outer shape of the radioactive substance 100, there is little space in the compartment of the radioactive substance storage part 42. Since heat transferability is not impaired, heat removal performance can be maintained.

  In addition, although the guide part 43 demonstrated having the length of the up-down direction of the dimension substantially the same as the dimension of the up-down direction of the radioactive substance storage part 42, it is not this limitation. For example, in order to suppress a situation in which the bundled shape of the radioactive material 100 in which a large number of fuel rods are bundled is changed by an external force that is crushed in the vertical direction, the radioactive material 100 may be spread at a portion where it can spread. Alternatively, the guide portion 43 may be provided. By doing so, the weight can be further reduced.

  Moreover, in the radioactive substance storage basket 14 of this embodiment, it is preferable that the radioactive substance storage part 42 is formed in a rectangular shape in the compartment.

  According to this radioactive substance storage basket 14, by forming the compartment shape of the radioactive substance storage part 42 in a rectangular shape, the workability is improved and the effect of facilitating the manufacture can be remarkably obtained. Further, the general radioactive substance 100 has a rectangular outer shape, and a rectangular compartment-shaped radioactive substance storage portion 42 that matches the outer shape of the radioactive substance 100 is also generally used. Therefore, the radioactive substance 100 having an outer shape different from the compartment shape of the radioactive substance storage part 42 is accommodated by providing the guide part 43 by using the general radioactive substance storage part 42 having the rectangular inner shape. In addition, in the fall of an accident event, it is possible to suppress the situation in which the bundled form is changed by an external force in which the radioactive substance 100 is crushed in the vertical direction, and to improve the subcritical performance.

  FIG. 7 is a plan view of another example of the radioactive substance storage basket according to the present embodiment.

  The radioactive substance storage basket 14 of this embodiment preferably has a neutron absorber 44 provided along the inner surface of the radioactive substance storage part 42 as shown in FIG.

  The neutron absorber 44 is formed in a plate shape having a length in the vertical direction that is substantially the same as the vertical dimension of the radioactive substance storage part 42, and is formed in a compartment shape along the inner surface of the radioactive substance storage part 42. It is provided all around. The neutron absorber 44 is made of, for example, an aluminum composite material or an aluminum alloy obtained by adding boron having a neutron absorption performance to aluminum or an aluminum alloy, or a boron compound. As the neutron absorber 44, gadolinium can be used in addition to boron.

  According to the radioactive substance storage basket 14, it is possible to appropriately absorb neutrons emitted from the radioactive substance 100 inserted inside the neutron absorber 44 in the compartment of the radioactive substance storage portion 42, and to achieve subcritical performance. Can be improved.

  Moreover, in the radioactive substance storage basket 14 of this embodiment, the guide part 43 may be formed as a neutron absorber.

  As a form in which the guide portion 43 is formed as a neutron absorber, the guide portion 43 may be further formed as a neutron absorber after the neutron absorber 44 is provided as shown in FIG. As shown in FIGS. 3 to 6, the guide portion 43 may be formed as a neutron absorber in a form in which the neutron absorber 44 of FIG. 7 is not provided.

  According to the radioactive substance storage basket 14, the guide part 43 is formed as a neutron absorber, so that neutrons emitted from the radioactive substance 100 inserted into the compartment of the radioactive substance storage part 42 are appropriately absorbed. It is possible to improve the subcritical performance. As shown in FIG. 7, if the neutron absorber 44 is provided and the guide portion 43 is further formed as a neutron absorber, neutrons emitted from the radioactive material 100 can be more appropriately absorbed. Critical performance can be further improved. If the guide part 43 is formed as a neutron absorber in the form in which the neutron absorber 44 of FIG. 7 is not provided as shown in FIGS. 3 to 6, it absorbs neutrons emitted from the radioactive material 100 and is lightweight. Can be achieved.

  FIG. 8 is an assembled perspective view of the radioactive substance storage basket according to this embodiment, FIG. 9 is a plan view of another example of the radioactive substance storage basket according to this embodiment, and FIG. It is a perspective view of the other example of the radioactive substance storage basket which concerns on embodiment.

  As shown in FIG. 8, the radioactive substance storage basket 14 of the present embodiment partitions the radioactive substance storage part 42 by combining the basket body 41 in a direction in which a plurality of plate members 41 a are stacked and intersecting the stacking direction. It is configured to form. The plate material 41a is provided with a notch 41b so as to mesh with another orthogonal plate material 41a, and the upper and lower ends of the plate materials 41a that extend in the same direction and are stacked vertically are brought into contact with each other by the notch 41b. It is formed as follows. Thereby, the lattice-like basket body 41 is assembled. The plate member 41a is provided with a through hole 41c penetrating in the longitudinal direction, and the through hole 41c functions as a flux trap for decelerating fast neutrons from the radioactive substance 100.

  Moreover, the guide part 43 has the length of the up-down direction of the dimension substantially the same as the dimension of the up-down direction of the radioactive substance storage part 42. As shown in FIG.

  As shown in FIGS. 9 and 10, a connecting portion 45 that connects the upper and lower ends of the stacked plate members 41 a and the upper and lower ends of the guide portion 43 is provided. In the present embodiment, the connecting portion 45 includes two fixing pieces 45a inserted into the hollow portions 43c of the two guide portions 43 disposed between the plate materials 41a, and the plate material 41a and the two guide portions 43. It is formed in a U-shape that crosses a part of. Then, by fixing the two fixing pieces 45a with fixing means (for example, bolts) 45b penetrating a part of the plate material 41a and the two guide portions 43, the stacked plate materials 41a are sandwiched vertically. It is connected via a guide part 43. 9 and 10 show the guide portion 43 having the form shown in FIG. 3, the plate member 41a is similarly disposed between the guide portions 43 having the form shown in FIGS. If the two guide portions 43 are connected, the stacked plate members 41a can be connected via the guide portions 43 so as to sandwich the upper and lower plates 41a.

  As described above, in the radioactive substance storage basket 14 of the present embodiment, the basket body 41 is formed by stacking the plurality of plate members 41a and combining them in a direction crossing the stacking direction to form the radioactive substance storage part 42. The guide part 43 is arranged in the radioactive substance storage part 42 continuously in the direction in which the plate members 41 a are stacked, and has a connecting portion 45 that connects both the stacked ends of the plate members 41 a and both ends of the guide unit 43. .

  According to the radioactive substance storage basket 14, a plurality of plate members 41a are stacked and combined in a direction intersecting the stacking direction to form the radioactive substance storage portion 42, thereby easily assembling the basket body 41. Can do. In addition, the guide portion 43 is continuously arranged in the radioactive substance storage portion 42 in the direction in which the plate members 41 a are stacked, and has a connecting portion 45 that connects both the stacked ends of the plate members 41 a and both ends of the guide portion 43. In this way, the stacked plate members 41a can be connected via the guide portion 43 so as to sandwich the plate member 41 up and down, and the basket body 41 is configured integrally without any displacement between the plate members 41a. Can be secured, and the basket body 41 can be easily assembled to the cask 11.

  In addition, the connection part 45 is applicable also to basket main bodies 41 other than the basket main body 41 of the structure shown in FIG. As described above, the basket main body 41 other than the basket main body 41 having the configuration shown in FIG. 9 is configured by combining a plurality of plates in a lattice shape, or configured by bundling a plurality of cylindrical materials in parallel. There is something that was done. That is, regardless of the configuration of the basket main body 41, the guide portion 43 is continuously disposed in the vertical direction of the radioactive substance storage portion 42, and the vertical end of the basket main body 41 (at least one end) You may have the connection part 45 which connects the edge part (at least one edge part) of the guide part 43 mutually.

  According to the radioactive substance storage basket 14, the guide part 43 can be positioned in the radioactive substance storage part 42 of the basket body 41 by connecting the guide part 43 to the basket body 41 by the connecting part 45. In addition, for the basket body 41 configured by combining a plurality of plate members in a lattice shape, two guide portions 43 arranged in each radioactive substance storage portion 42 of the adjacent cylindrical material are connected to a U-shaped connecting portion. If it connects with 45 (refer FIG. 10), it will connect an adjacent cylinder, and since the basket main body 41 is comprised integrally, without adjoining adjacent cylinders, the radioactive substance 100 is accommodated. In addition, the basket body 41 can be easily assembled to the cask 11. Furthermore, with respect to the basket main body 41 configured by bundling a plurality of cylindrical materials in parallel, two guide portions 43 arranged in each radioactive substance storage portion 42 of the adjacent cylindrical materials are connected in a U-shape. If it connects with the part 45 (refer FIG. 10), it will connect an adjacent cylinder material, and since the basket main body 41 is comprised integrally, without the adjacent cylinder materials shifting | deviating, the radioactive substance 100 is made. The strength for storage can be ensured, and the basket body 41 can be easily assembled to the cask 11.

  Moreover, in embodiment mentioned above, it is preferable that the basket main body 41 consists of carbon steel or stainless steel.

  Therefore, according to the radioactive substance storage basket 14, it is possible to sufficiently secure the strength for storing the radioactive substance 100.

  In the above-described embodiment, the guide portion 43 is preferably made of an aluminum alloy.

  Therefore, according to the radioactive substance storage basket 14, the guide portion 43 can be easily manufactured by extrusion molding, and the weight can be reduced, and the heat transfer performance is improved, so that the heat removal performance is improved. be able to.

  In the above-described embodiment, the guide portion 43 is preferably subjected to a liquid-resistant surface treatment. Liquid-resistant surface treatment includes sealing treatment and plating treatment (for example, nickel plating).

  Therefore, according to the radioactive substance storage basket 14, water is injected into the pool containing the radioactive substance 100 in order to absorb neutrons and prevent the criticality between adjacent radioactive substances 100. Is stored in the pool water when stored in the radioactive substance storage basket 14, and at this time, the durability of the guide portion 43 against the pool water can be improved.

  In the above-described embodiment, it is preferable that the guide portion 43 is subjected to a heat radiating surface treatment. The heat-dissipating surface treatment includes sealing treatment, plating treatment (for example, nickel plating), and coloring treatment (for example, black coloring).

  Therefore, according to the radioactive substance storage basket 14, the heat transfer performance of the guide portion 43 is enhanced, so that the heat removal performance can be improved.

  11 and 12 are plan views of other examples of the radioactive substance storage basket according to the present embodiment.

  As shown in FIG. 11, the radioactive substance storage basket 14 of the present embodiment has a cylindrical member 46 that matches the outer shape of the radioactive substance 100. The cylindrical member 46 has a length in the vertical direction that is substantially the same as the vertical dimension of the radioactive substance storage part 42, and is disposed between the guide part 43 and the radioactive substance 100. Here, a rectangular cylindrical inner shape of the radioactive substance storage part 42 is provided, and the circular cylindrical shape is provided with the guide part 43 in the form shown in FIG. 3 so as to match the circular outer shape of the radioactive substance 100. A member 46 is provided. In addition, although not shown in the figure, when the guide section 43 having the form shown in FIG. 4 is provided in which the rectangular inner shape of the radioactive substance storage section 42 is matched with the hexagonal outer shape of the radioactive substance 100 And a hexagonal cylindrical member.

  According to this radioactive substance storage basket 14, since the radioactive substance 100 is surrounded by the cylindrical member 46, the radioactive substance 100 having a shape in which a large number of fuel rods are bundled is bundled by an external force that is crushed in the vertical direction. The situation in which the shape is changed can be further suppressed, and the subcritical performance can be further enhanced.

  In the present embodiment, the cylindrical member 46 is preferably a neutron absorber.

  Therefore, according to this radioactive substance storage basket 14, neutrons emitted from the radioactive substance 100 inserted inside the cylindrical member 46, which is a neutron absorber, can be properly absorbed, and the subcritical performance is improved. can do.

  Moreover, in this embodiment, it is preferable that the cylindrical member 46 consists of carbon steel or stainless steel.

  Therefore, according to the radioactive substance storage basket 14, the strength for storing the radioactive substance 100 can be sufficiently secured, and the radioactive substance 100 having a shape in which a large number of fuel rods are bundled is crushed in the vertical direction. It is possible to remarkably obtain the effect of further suppressing the situation in which the bundled form is changed by the external force and further improving the subcritical performance.

  Moreover, in this embodiment, as shown in FIG. 12, it is preferable that the cylindrical member 46 is comprised in multiple, at least one is a neutron absorber, and at least one other consists of carbon steel or stainless steel. In FIG. 12, the cylindrical member 46 is constituted by double cylindrical members 46 </ b> A and 46 </ b> B, one of which is a neutron absorber and the other is made of carbon steel or stainless steel.

  Therefore, according to this radioactive substance storage basket 14, the neutrons emitted from the radioactive substance 100 inserted inside the cylindrical member 46 (for example, the cylindrical member 46B), which is a neutron absorber, are appropriately absorbed. And the subcritical performance can be improved. Moreover, according to the radioactive substance storage basket 14, the cylindrical member 46 (for example, the cylindrical member 46A) made of carbon steel or stainless steel can sufficiently secure the strength for storing the radioactive substance 100, To suppress the situation in which the bundled shape is changed by an external force in which the radioactive material 100 formed by bundling a large number of fuel rods is crushed in the vertical direction, and to significantly increase the subcritical performance. Can do.

  Further, the radioactive substance storage container (cask 11) of the present embodiment has a cylindrical body portion 12 having an opening 22 formed on one side and a closed portion (bottom 23) formed on the other side, and the opening 22 formed therein. The lid 13 is detachable from the body 12 so as to be closed, and the above-described radioactive substance storage basket 14 accommodated in the body 12.

  According to the cask 11, a large number of fuel rods can be used in the event of a fall of an accident event by matching the inner shape of the radioactive substance storage part 42 with the outer shape of the radioactive substance 100 by the guide part 43 of the radioactive substance storage basket 14. In order to suppress the situation where the bundled shape is changed by an external force that crushes the radioactive substance 100 in a bundled shape in the vertical direction, the subcritical performance is prevented to prevent the radioactive substance 100 from entering a critical state. Can do. In addition, the guide part 43 is inserted into the compartment of the radioactive substance storage part 42, and in order to match the inner shape of the radioactive substance storage part 42 with the outer shape of the radioactive substance 100, the radioactive substance storage part 42 has a uniform thickness. Since it can be formed, the weight can be reduced, and the processability is good and the manufacturing can be facilitated. If the radioactive substance storage basket 14 is lightweight, the assembling work to the cask 11 itself is easy, and the cask 11 itself is reduced in weight to improve portability. If manufacturing of the radioactive substance storage basket 14 is easy, the manufacturing cost of the radioactive substance storage basket 14 and the cask 11 itself can be reduced. In addition, since the guide part 43 is inserted into the compartment of the radioactive substance storage part 42 and the inside shape of the radioactive substance storage part 42 is matched with the outer shape of the radioactive substance 100, there is little space in the compartment of the radioactive substance storage part 42. Since heat transferability is not impaired, heat removal performance can be maintained.

11 Cask (radioactive substance storage container)
12 trunk 13 lid 14 radioactive substance storage basket 22 opening 23 bottom (blocking)
41 Basket body 41a Plate material 42 Radioactive substance storage part 43 Guide part 44 Neutron absorber 45 Connection part 46 (46A, 46B) Cylindrical member

Claims (14)

The basket body,
A plurality of radioactive substance storage parts formed in the basket body in parallel with each other at a predetermined interval;
Inserted into the compartment of the radioactive substance storage section, the internal shape of the radioactive substance storage section is made the external shape of the radioactive substance so as to store the radioactive material having a different external shape with respect to the internal shape of the radioactive substance storage section A matching guide part,
Equipped with a,
The guide part is arranged continuously in the vertical direction of the radioactive substance storage part, and has a connecting part that connects the end part of the basket body in the vertical direction and the end part of the guide part. A featured radioactive material storage basket. The basket body,
A plurality of radioactive substance storage parts formed in the basket body in parallel with each other at a predetermined interval;
Inserted into the compartment of the radioactive substance storage section, the internal shape of the radioactive substance storage section is made the external shape of the radioactive substance so as to store the radioactive material having a different external shape with respect to the internal shape of the radioactive substance storage section A matching guide part,
Equipped with a,
The basket body includes a plurality of plates stacked and combined in a direction intersecting the stacking direction to define the radioactive substance storage unit, and the guide unit continuously includes the radioactive material in the stacking direction of the plates. A radioactive substance storage basket , which is disposed in a substance storage part and has a connecting part that connects the stacked ends of the plate members and the both ends of the guide part . The radioactive substance storage basket according to claim 1 or 2 , wherein the radioactive substance storage part is formed in a rectangular shape in the compartment. The radioactive substance storage basket according to any one of claims 1 to 3, further comprising a neutron absorber provided along an inner surface of the radioactive substance storage part. Radioactive material storage basket according to any one of claims 1-4, characterized in that said guide portion is formed as a neutron absorber. The radioactive substance storage basket according to any one of claims 1 to 5 , wherein the basket body is made of carbon steel or stainless steel. The radioactive substance storage basket according to any one of claims 1 to 6 , wherein the guide portion is made of an aluminum alloy. Radioactive material storage basket according to any one of claims 1-7, characterized in that said guide portion is subjected to a surface treatment of liquid-resistant. The radioactive substance storage basket according to any one of claims 1 to 8 , wherein the guide portion is subjected to a heat radiating surface treatment. The radioactive substance storage basket according to any one of claims 1 to 9 , further comprising a cylindrical member adapted to an outer shape of the radioactive substance. The radioactive substance storage basket according to claim 10 , wherein the cylindrical member is a neutron absorber. The radioactive substance storage basket according to claim 10 , wherein the cylindrical member is made of carbon steel or stainless steel. 11. The radioactive substance storage basket according to claim 10 , wherein the cylindrical member is configured in multiples, at least one is a neutron absorber, and at least the other is made of carbon steel or stainless steel. A barrel part having an opening formed on one side and a closed part formed on the other to form a cylinder;
A lid that can be attached to and detached from the trunk so as to close the opening;
The radioactive substance storage basket according to any one of claims 1 to 13 , which is accommodated in the trunk portion,
The radioactive substance storage container characterized by having.

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