JP2014002017A - Nuclear fuel storage rack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress simplification of a structure and an increase in manufacturing cost in a nuclear fuel storage rack.SOLUTION: A nuclear fuel storage rack includes: a plurality of cell storage parts 47, 47A capable of storing fuel assemblies 20, 30 by being demarcated by frame bodies 44 and cell barrier ribs 45, 46; and adaptors 61, 71, 81, 91 capable of adjusting the width of the cell storage parts 47, 47A by being detachably mounted so as to hold the frame bodies 44 and the cell barrier ribs 45, 46.

Description

  The present invention relates to a nuclear fuel storage rack that temporarily stores a fuel assembly that is an assembly of a plurality of nuclear fuels.

  Examples of nuclear reactors used in nuclear power plants include pressurized water reactors and boiling reactors. In this nuclear reactor, a large number of fuel assemblies (nuclear fuel) are arranged inside, and light water is used as a reactor coolant and a neutron moderator, and light water is heated by heat generated by nuclear fission, Electricity is generated by heated light water (steam).

  In such a nuclear reactor, an unused fuel assembly (fuel rod) to be used newly and a fuel pool for temporarily storing used fuel assemblies (fuel rods) that have already been used are provided in the reactor building. It has been. The fuel pool is provided with a nuclear fuel storage rack that supports a number of unused fuel assemblies and used fuel assemblies in an upright state. In such a nuclear fuel storage rack, a plurality of cells are generally formed by combining a plurality of partition walls in a lattice shape, and a fuel assembly is inserted and supported in each cell. The fuel pool is filled with water to remove the decay heat of the spent fuel assembly and shield radiation.

  Since the size (length and width) of this fuel assembly differs depending on the type of nuclear reactor, a nuclear fuel storage rack of a size exclusively for the nuclear reactor is currently manufactured and used. Therefore, when there are different types of nuclear reactors in one nuclear power plant, for example, the fuel assembly used in the pressurized water reactor cannot be stored in the nuclear fuel storage rack of the fuel pool corresponding to the boiling nuclear reactor. Inconvenient. As what solves such a problem, there exist some which were described in the following patent document, for example.

Japanese Utility Model Publication No. 63-122296 Japanese Utility Model Publication No. 02-063500

  In the conventional nuclear fuel storage rack described above, an adapter is inserted into a rack cell via a spacer to support different types of fuel assemblies. However, separately manufacturing a dedicated adapter having a cylindrical shape requires a molding process into a cylindrical shape, which may lead to an increase in production cost. This adapter is supported by the wall of the rack cell via a locally installed spacer, and local stress is concentrated here. For this reason, it is necessary to increase the wall thickness of the adapter and the rack cell because it is necessary to withstand local concentrated stress and to secure sufficient strength in consideration of deformation prevention. This also increases the cost. There is a risk that. Furthermore, the adapters and the rack cells increase in weight when the wall portions are thickened, so that the load during an earthquake also increases, which may affect the structural strength of the nuclear fuel storage rack and the fuel pool.

  The present invention solves the above-described problems, and an object thereof is to provide a nuclear fuel storage rack capable of simplifying the structure and suppressing an increase in manufacturing cost.

  In order to achieve the above object, a nuclear fuel storage rack according to the present invention includes a plurality of cell storage units that are partitioned by partition walls and can store nuclear fuel, and are detachably mounted so as to sandwich the partition walls. And an adapter capable of adjusting the width.

  Therefore, since the width of the cell accommodating portion can be adjusted simply by attaching the adapter to the partition wall constituting the cell accommodating portion, an adapter having a thickness corresponding to the size of the nuclear fuel to be accommodated may be prepared. In addition to simplification, an increase in manufacturing cost can be suppressed.

  In the nuclear fuel storage rack according to the present invention, the cell accommodating portion has a quadrangular prism shape defined by the four partition walls, and the adapters are mounted on the four partition walls, respectively.

  Therefore, by attaching adapters to all of the four partition walls constituting the cell accommodating portion, the size of the cell accommodating portion can be appropriately adjusted with respect to the nuclear fuel to be accommodated.

  In the nuclear fuel storage rack according to the present invention, a base is fixed to the lower part of the plurality of cell receiving parts, a plurality of legs are fixed to the lower part of the base, and the cell receiving part communicates with the outside to the base. A cooling water hole is formed.

  Therefore, when the nuclear fuel storage rack is installed in the pool, the cell housing portion is supported by a plurality of legs via the base plate, and the cooling water hole that connects the cell storage portion and the outside is formed in the base plate. The nuclear fuel can be properly supported and can be effectively cooled.

  In the nuclear fuel storage rack of the present invention, the adapter is characterized in that its thickness is set so as to ensure a predetermined gap between the adapter and the nuclear fuel accommodated in the cell accommodating portion. .

  Therefore, by securing a predetermined gap between the adapter and the nuclear fuel, it is possible to easily take in and out the nuclear fuel with respect to the cell accommodating portion, and to suppress the application of an excessive impact load to the nuclear fuel, Nuclear fuel can be safely stored.

  In the nuclear fuel storage rack according to the present invention, the adapter is in contact with each flat portion of the partition wall to perform positioning in the width direction of the cell accommodating portion, and the side portion of the nuclear fuel accommodated in the cell accommodating portion. It has the support part which can be supported in contact with, and is characterized by the above-mentioned.

  Therefore, the adapter can be positioned in contact with the partition wall by the positioning portion, so that the cell accommodating portion can be adjusted to an appropriate width. At this time, the nuclear fuel accommodated in the cell accommodating portion by the support portion can be appropriately adjusted. Can be supported.

  In the nuclear fuel storage rack according to the present invention, the adapter includes the two support portions that respectively support the side portions of the nuclear fuel stored in the two adjacent cell storage portions.

  Therefore, it is possible to configure a nuclear fuel support portion for the two cell accommodating portions simply by attaching one adapter to the partition wall, and it is possible to reduce the cost.

  In the nuclear fuel storage rack according to the present invention, the adapter is characterized in that an inclined surface in which the width of the cell accommodating portion becomes wider upward is formed at the upper end portion.

  Therefore, by forming an inclined surface at the upper end portion of the adapter, the nuclear fuel can be easily accommodated in the cell accommodating portion whose width is adjusted by the adapter using the inclined surface as a guide surface.

  In the nuclear fuel storage rack of the present invention, the partition wall is characterized in that a taper is formed in the upper end portion so as to decrease in thickness upward.

  Therefore, an adapter can be easily inserted in this partition by forming a taper in the upper end part of a partition.

  The nuclear fuel storage rack according to the present invention is characterized in that a raised platform is provided at a lower portion of the cell housing portion.

  Therefore, when a nuclear fuel having a short length is accommodated in the cell accommodating portion, a raising stand is provided at the lower portion of the cell accommodating portion, and the nuclear fuel is accommodated on the raising stand so that the upper end of the short nuclear fuel is accommodated. The position of the portion is arranged at the upper end portion of the cell accommodating portion in the same manner as other nuclear fuels, and the nuclear fuel can be easily taken in and out by the fuel handling tool.

  In the nuclear fuel storage rack according to the present invention, the adapter is mounted so as to face the four partition walls constituting the cell housing portion.

  Therefore, the assembling property of the adapter can be improved.

  In the nuclear fuel storage rack of the present invention, the adapter is mounted so as to face the four partition walls constituting the cell housing portion and be shifted in the width direction.

  Accordingly, the widths of the four adapters can be made the same size, and the types of adapters can be reduced to improve productivity, and the production cost can be reduced.

  In the nuclear fuel storage rack of the present invention, the cell storage portion is set to a width capable of storing the PWR nuclear fuel, and the adapter can store the BWR nuclear fuel in the cell storage portion when mounted on the partition wall. It is characterized by being set to a proper thickness.

  Therefore, different types of PWR nuclear fuel and BWR nuclear fuel can be easily accommodated in the cell accommodating portion.

  According to the nuclear fuel storage rack of the present invention, a plurality of cell storage portions that are partitioned by partition walls and can store nuclear fuel, and an adapter that is detachably mounted so as to sandwich the partition walls and can adjust the width of the cell storage portion. Therefore, it is sufficient to prepare an adapter having a thickness corresponding to the size of the nuclear fuel to be accommodated, the structure can be simplified, and an increase in manufacturing cost can be suppressed.

FIG. 1 is a plan view showing a nuclear fuel storage rack according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing the nuclear fuel storage rack of the first embodiment. FIG. 3 is a top sectional view of a partition wall in the nuclear fuel storage rack. FIG. 4 is a front view of the platform in the nuclear fuel storage rack. FIG. 5 is a plan view of a platform in the nuclear fuel storage rack. FIG. 6 is a cross-sectional view of the bottom portion of the platform. FIG. 7 is a plan view of the bottom of the base plate. FIG. 8 is a schematic view showing a support state of the BWR fuel assembly in the nuclear fuel storage rack. FIG. 9 is a front view of the first adapter attached to the nuclear fuel storage rack. FIG. 10 is a side view of the first adapter. 11 is a cross-sectional view taken along the line XI-XI in FIG. 9 showing a cross section of the first adapter. FIG. 12 is a front view of the second adapter attached to the nuclear fuel storage rack. FIG. 13 is a side view of the second adapter. 14 is a cross-sectional view of the second adapter taken along the line XIV-XIV in FIG. 12. FIG. 15 is a horizontal sectional view showing a state in which the fuel assembly is supported by the nuclear fuel storage rack to which the adapter is attached. FIG. 16 is a schematic view of a main part of a reactor building having a reactor containment vessel. FIG. 17 is a schematic view of a PWR fuel assembly. FIG. 18 is a schematic view of a BWR fuel assembly. FIG. 19 is a longitudinal sectional view showing a nuclear fuel storage rack according to Embodiment 2 of the present invention. FIG. 20 is a plan view of a lifting platform used in the nuclear fuel storage rack of the second embodiment. FIG. 21 is a longitudinal sectional view of the raising rack. FIG. 22 is a plan view illustrating a nuclear fuel storage rack according to Embodiment 3 of the present invention. FIG. 23 is a front view of the first adapter attached to the nuclear fuel storage rack according to the fourth embodiment of the present invention. FIG. 24 is a side view of the first adapter. FIG. 25 is a perspective view of the first adapter. FIG. 26 is a front view of the second adapter attached to the nuclear fuel storage rack. FIG. 27 is a side view of the second adapter. 28 is a cross-sectional view taken along the line XXVIII-XXVIII in FIG. 26 showing a cross section of the second adapter. FIG. 29 is a plan view illustrating a nuclear fuel storage rack according to the fourth embodiment. FIG. 30 is a plan view illustrating a nuclear fuel storage rack according to the fifth embodiment of the present invention. FIG. 31 is a plan view showing a nuclear fuel storage rack according to Embodiment 6 of the present invention. FIG. 32 is a longitudinal sectional view showing a nuclear fuel storage rack according to Embodiment 7 of the present invention.

  Exemplary embodiments of a nuclear fuel storage rack according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  1 is a plan view showing a nuclear fuel storage rack according to a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing the nuclear fuel storage rack of the first embodiment, and FIG. 3 is an upper sectional view of a partition wall in the nuclear fuel storage rack. 4 is a front view of the base in the nuclear fuel storage rack, FIG. 5 is a plan view of the base in the nuclear fuel storage rack, FIG. 6 is a sectional view of the bottom of the base, and FIG. 7 is a bottom view of the base. FIG. 8 is a schematic view showing the support state of the BWR fuel assembly in the nuclear fuel storage rack, FIG. 9 is a front view of the first adapter mounted on the nuclear fuel storage rack, and FIG. FIG. 11 is a cross-sectional view taken along the line XI-XI of FIG. 9 showing a cross section of the first adapter, FIG. 12 is a front view of the second adapter mounted on the nuclear fuel storage rack, and FIG. 13 is a side view of the second adapter. 14 and FIG. 14 are views showing a cross section of the second adapter. XIV-XIV sectional view of Fig. 2, Fig. 15 is a horizontal sectional view showing a state in which the fuel assembly is supported by the nuclear fuel storage rack to which the adapter is mounted, and Fig. 16 is an outline of a main part of the reactor building having the reactor containment vessel. FIG. 17 is a schematic view of a PWR fuel assembly, and FIG. 18 is a schematic view of a BWR fuel assembly.

  The nuclear fuel storage rack is installed in a fuel pool provided in a reactor building of a nuclear power plant. The nuclear power plant is provided with a pressurized water reactor (PWR) and a boiling water reactor (BWR). Therefore, the nuclear fuel storage rack can accommodate the nuclear fuel (fuel assembly) for PWR, and can accommodate the nuclear fuel (fuel assembly) for BWR. The pressurized water reactor uses light water as the reactor coolant and neutron moderator, and generates high-temperature and high-pressure water that does not boil throughout the primary system, and sends this high-temperature and high-pressure water to a steam generator to generate steam by heat exchange. The steam is sent to a turbine generator to generate electricity. On the other hand, boiling water reactors use light water as a reactor coolant and neutron moderator, boil this light water at the core to generate steam, and send this steam directly to a turbine generator to generate electricity. is there.

  In the first embodiment, description will be made by applying to a nuclear fuel storage rack installed in a fuel pool provided in a nuclear reactor building in a nuclear power plant having a pressurized water reactor.

  In a nuclear power plant having a pressurized water reactor, as shown in FIG. 16, a reactor containment vessel 11 contains a pressurized water reactor 12, a steam generator 13, a pressurizer 14, and the like. The reactor 12 and the steam generator 13 are connected via a cooling water pipe, a pressurizer 14 is provided in one cooling water pipe, and a cooling water pump is provided in the other cooling water pipe. Therefore, in the pressurized water reactor 12, light water is heated as primary cooling water by low-enriched uranium or MOX as fuel, and the high-temperature primary cooling water is maintained at a predetermined high pressure by the pressurizer 14 through the cooling water pipe. It is sent to the steam generator 13. In the steam generator 13, heat exchange is performed between the high-pressure and high-temperature primary cooling water and the secondary cooling water, and the cooled primary cooling water is returned to the pressurized water reactor 12 through the cooling water pipe.

  In the reactor containment vessel 11, a fuel handling building (reactor building) 15 is installed adjacently, and a spent fuel pool 16 is provided in the fuel handling building 15, and inside the spent fuel pool 16. A nuclear fuel storage rack 17 is installed. The nuclear fuel storage rack 17 temporarily stores the used fuel (PWR fuel assembly) used in the pressurized water reactor 12, and the spent fuel stored in the nuclear fuel storage rack 17 is The spent fuel pool 16 is filled and can be cooled by circulating cooling water.

  The nuclear fuel storage rack 17 can temporarily store the spent fuel (BWR fuel assembly) used in the boiling nuclear reactor (not shown). In this case, the nuclear fuel storage rack 17 can simultaneously accommodate the PWR fuel assembly and the BWR fuel assembly.

  Here, the fuel assembly for PWR and the fuel assembly for BWR will be described. As shown in FIG. 17, the PWR fuel assembly 20 includes a plurality of fuel rods 21 bundled in a lattice shape with a support lattice 22, and an upper nozzle 23 is fixed to the upper end portion, while a lower portion is disposed on the lower end portion. The nozzle 24 is fixed. Although not shown, the PWR fuel assembly 20 has a plurality of control rod guide thimbles into which control rods are inserted and a reactor internal meter into which in-core instrumentation detectors are inserted. A wearing guide thimble is provided. Then, the upper ends of the plurality of control rods are combined into a control rod cluster 25.

  On the other hand, as shown in FIG. 18, the BWR fuel assembly 30 includes a plurality of fuel rods 31 bundled in a lattice shape by a spacer grid 32, and an upper tie plate 33 is fixed to the upper end portion, while the lower end A lower tie plate 34 is fixed to the part and is accommodated in a rectangular tube channel box 35. In the BWR fuel assembly 30, a bundle of fuel rods 31 includes a small number of water pipes 36 formed of hollow tubes at the center, a handle 37 is fixed to the upper tie plate 33, and a nosepiece is attached to the lower tie plate 34. 38 is fixed.

  As shown in FIGS. 1 and 2, the nuclear fuel storage rack 17 according to the first embodiment includes a rack body 41, a base plate 42, and a plurality of (four in this embodiment) leg portions 43. The rack body 41 is configured such that a plurality of cell storage portions 47 are partitioned and formed by combining a plurality of cell partition walls 45 and 46 in a rectangular tube-shaped frame body 44 so as to form a lattice shape. In this case, the plurality of cell accommodating portions 47 have a cylindrical shape, and all the widths and lengths (heights) have the same shape and the same dimensions. The PWR fuel assembly 20 includes, for example, a plurality of fuel rods 21 arranged in a 17 × 17 square lattice, and the cell housing portion 47 has a width W1 that is the width of the PWR fuel assembly 20. The dimensions are slightly larger than W2. That is, when the cell accommodating portion 47 accommodates the PWR fuel assembly 20, a predetermined gap S1 is secured between the wall surface of the cell accommodating portion 47 and the side surface of the PWR fuel assembly 20. The dimension of the width W1 is set. Further, in order to protect the PWR fuel assembly 20, the cell housing portion 47 has a length (height) L1 within a range where the PWR fuel assembly 20 can be gripped, and the length L2 of the PWR fuel assembly 20. The dimensions are slightly larger. That is, the dimension of the length L1 is set so that the cell accommodating portion 47 does not protrude upward when the PWR fuel assembly 20 is accommodated. The cell partition walls 45 and 46 are made of stainless steel or aluminum alloy, boron or a compound thereof, kadolinium or a compound thereof, cadmium or a material having excellent neutron absorption ability such as this compound, or a composite is added. It is desirable to use aluminum or stainless steel.

  By the way, the PWR fuel assembly 20 is not limited to one in which a plurality of fuel rods 21 are arranged in a 17 × 17 square lattice shape, but in which a plurality of fuel rods are arranged in a 15 × 15 square lattice shape, There are a plurality of fuel rods arranged in a 14 × 14 square lattice, and their widths are different. The BWR fuel assembly 30 includes a plurality of fuel rods arranged in a square lattice of, for example, 8 × 8 or 7 × 7, and their width W21 is greater than the width W2 of the PWR fuel assembly 20. The dimensions are small.

The frame body 44 and the cell partition walls 45 and 46 are all set to have the same thickness T1 and the same length L1. In this case, it is not necessary for the frame body 44 and the cell partition walls 45, 46 to have the same thickness T1 or length L1, and the frame body 44 and the cell partition walls 45, 46 have different thicknesses T1. You may set to a dimension. That is, the thicknesses of the cell partition walls 45 and 46 are set so that adjacent fuel assemblies do not reach criticality. Therefore, the cell partition wall 45 and the cell partition wall 46 are limited to using the same material. It is desirable to set the same thickness. On the other hand, half the thickness of the cell partition walls 45 and 46 is sufficient for the frame body 44. As a result, even when the nuclear fuel storage racks 17 adjacent to each other due to an earthquake or the like are in close contact with each other without a gap, a thickness equivalent to the thickness T1 of the cell partition walls 45 and 46 can be secured. Is maintained in the same manner as the cell partition walls 45 and 46 so that the fuel assembly does not reach criticality. Further, as shown in FIG. 3, the frame body 44 and the cell partition walls 45, 46 are formed with a tapered portion 48 whose thickness decreases upward at the upper end portion. , 471 can be easily inserted. The tapered portion 48 is formed by two inclined surfaces 48a and 48b. In addition, as for this frame 44 and the cell partition 45,46, it is preferable to set the angle of the inclined surface 48a to 60 degrees or less with respect to a plane part.

  As shown in FIGS. 4 and 5, the base plate 42 has a hollow quadrangular prism shape including a substrate 51, a bottom plate 52, and a side plate 53 having a square tube shape. The rack body 41 is fixed to the upper part. In this case, the rack body 41 and the base plate 42 have the same outer width. In the base plate 42, cooling water holes 54 are formed in the substrate 51 and the bottom plate 52 so as to correspond to the respective cell housing portions 47. As shown in FIGS. 6 to 8, the cooling water hole 54 has an elliptical shape and is formed with a tapered surface 54 a whose diameter increases upward at the top. In this case, when the BWR fuel assembly 30 is accommodated in the cell accommodating portion 47 of the rack body 41, the nose piece 38 of the lower tie plate 34 enters the cooling water hole 54 having an elliptical shape through the tapered surface 54a. The base plate 42 can properly support the BWR fuel assembly 30 and the cooling water hole 54 has an elliptical shape, so that the nose piece 38 can be cooled from the opening of the gap without blocking the cooling water hole 54. Distribution of water becomes possible. The cooling water hole 54 has a triangular shape, a polygon including a square and a rectangle, a circular shape, an oval shape, a cross shape, a petal shape, a shape similar to these shapes, or a shape obtained by appropriately combining these shapes. Also good.

  Further, in the base plate 42, cooling water holes 55 are formed in the side plate 53 so as to correspond to the respective cell housing portions 47. Further, reinforcing plates 56 and 57 having a lattice shape corresponding to the partition walls 45 and 46 are fixed so as to partition the cooling water holes 54 and 55, and the cooling water holes 55 are also formed in the reinforcing plates 56 and 57. Is formed. Further, the base plate 42 has leg portions 43 fixed to the four corners on the lower surface of the bottom plate 52, respectively. A cooling water hole 55 is formed in each leg portion 43. Here, although the four leg portions 43 are provided at the lower portion of the base plate 42, the installation position and the number of installation of the leg portions 43 may be changed as appropriate.

  Further, as shown in FIGS. 1 and 2, the nuclear fuel storage rack 17 according to the first embodiment is detachably mounted so as to sandwich the frame body 44 and the cell partition walls 45 and 46, and adjusts the width of the cell storage portion 47. A plurality of four possible adapters 61, 71, 81, 91 are provided. In this case, in the cell accommodating portion 47, the adapters 61, 71, 81, 91 can be attached to the four surrounding frame bodies 44 and the cell partition walls 45, 46, respectively. In the present embodiment, the cell accommodating portion 47 is adjusted to the cell accommodating portion 47A whose width is reduced by attaching each adapter 61, 71, 81, 91. The adapters 61, 71, 81, 91 are made of stainless steel or aluminum alloy, or boron or a compound thereof, cadmium or a compound thereof, cadmium or a compound having excellent neutron absorption ability such as this compound alone, or It is desirable to use aluminum or stainless steel to which the composite is added.

  As shown in FIGS. 9 to 11, the adapter 61 is a plurality of positioning portions that contact the flat portions of the frame body 44 and the cell partition walls 45 and 46 and perform positioning in the width direction of the cell accommodating portion 47 (47A). (In this embodiment, two) ribs 62 and guides as support portions that can be supported by contacting the side portions of the fuel assemblies (for example, the BWR fuel assemblies 30) accommodated in the cell accommodating portion 47A. A guide 63 is provided.

  The guide guide 63 is formed by forming a plate material in an inverted U shape. Two guide surfaces 64 that are substantially parallel to each other are formed, and at the upper end, two symmetrical thin films whose thickness decreases upward. An inclined surface 65 is formed. In this case, the guide guide 63 preferably sets the angle of the inclined surface 65 to 60 degrees or less with respect to the guide surface 64. Therefore, as shown in FIG. 2, the cell accommodating portion 47 </ b> A is wide at the upper end due to the inclined surface 65 of the guide guide 63 in the adapter 61.

  The ribs 62 have an inverted U shape in which a groove portion 66 opened downward is formed in the center of the plate material, and two ribs 62 are fixed inside the guide guide 63 at a predetermined interval in the width direction. In this rib 62, the width W3 of the groove 66 is set slightly larger than the thickness T1 of the cell partition walls 45 and 46, and the length (height) L3 is equal to the length L1 of the frame body 44 and the cell partition walls 45 and 46. Or set longer. The adapter 61 is set to have a width W61 and a thickness T61. The length L3 of the cell housing portion 47A is equal to the length of the BWR fuel assembly 30 in order to protect the BWR fuel assembly 30, or within the range where the BWR fuel assembly 30 can be gripped. Make it slightly longer. Further, when the length of the BWR fuel assembly 30 is longer than the length L1 of the cell housing portion 47 of the rack body 41, the adapter 61 may be extended and protruded from the upper end of the rack body 41. .

  The adapter 71 has the same shape as the adapter 61 and has two ribs as a positioning portion and a guide guide as a support portion (not shown). The adapter 71 is set to have a width W71 and a thickness T71 as shown in FIG.

  As shown in FIGS. 12 to 14, the adapter 81 abuts against each plane portion of the frame body 44 and the cell partition walls 45, 46, and serves as a positioning portion for positioning in the width direction in the cell housing portion 47 </ b> A; A guide guide 83 is provided as a support portion that can be in contact with and supported by the side portion of the fuel assembly (for example, the BWR fuel assembly 30) accommodated in the cell accommodating portion 47A.

  The guide guide 83 is formed by forming a plate material in an inverted U shape, and has a guide surface 84 formed on one side in the thickness direction, and one slope whose thickness decreases upward at the upper end portion. A surface 85 is formed. In this case, the guide guide 83 preferably sets the angle of the inclined surface 85 to 60 degrees or less with respect to the guide surface 84. Therefore, as shown in FIG. 13, the width of the cell accommodating portion 47 </ b> A is widened at the upper end due to the inclined surface 85 of the guide guide 83 in the adapter 81. 1, 2, and 13, the adapter 81 is attached to the frame body 44 or the partition wall 45 of the nuclear fuel storage rack 17. Although two inclined surfaces 85 are formed, the two attached to the partition wall 45 are formed with two inclined surfaces 85 symmetrical in the thickness direction. In this case, it is good also as the adapter 81 in which all the two inclined surfaces 85 were formed in consideration of manufacturing cost.

  The rib 82 has a groove 86 formed in the side portion of the plate material, and two ribs 82 are fixed inside the guide guide 83 at a predetermined interval in the width direction. In this case, in the adapter 81, the groove portion 86 is located on the flat surface portion 87 on the side opposite to the guide surface 84. When the adapter 81 is attached to the partition wall 45, the flat surface portion 87 functions as a guide surface that supports the PWR fuel assembly 20. In the adapter 81, the width W3 of the groove 86 is set slightly larger than the thickness of the frame body 44 and the cell partition walls 45, 46, and the length L3 is substantially equal to the length L1 of the frame body 44 and the cell partition walls 45, 46. It is set equally. The adapter 81 is set to have a width W81 and a thickness T81. The cell accommodating portion 47A has a length (height) L3 equal to the length of the BWR fuel assembly 30 in order to protect the BWR fuel assembly 30, or the BWR fuel assembly 30. Slightly longer as long as there is no hindrance to grasping. When the length of the BWR fuel assembly 30 is longer than the cell accommodating portion 47 of the rack body 41, the adapter 81 is mounted in a state of extending from the upper end of the rack body 41.

  The adapter 91 has the same shape as the adapter 81 and has two ribs as a positioning portion and a guide guide as a support portion, although not shown. The adapter 91 is set to have a width W91 and a thickness T91 as shown in FIG.

  As shown in FIG. 1, the nuclear fuel storage rack 17 according to the first embodiment is equipped with the above-described four types of adapters 61, 71, 81, 91 in a part of the cell accommodating portions 47. The width W1 is adjusted to the width W11 of the cell accommodating portion 47A, and the BWR fuel assembly 30 can be accommodated. That is, in the nuclear fuel storage rack 17, the adapters 81 and 91 are attached to the surrounding frame 44, the adapters 71 and 91 are attached to the cell partition wall 45, and the adapter 61 is attached to the cell partition wall 46. The width W1 of the accommodating portion 47 is adjusted to the width W11 of the cell accommodating portion 47A that can properly accommodate the BWR fuel assembly 30.

  Specifically, as shown in FIG. 15, in the cell storage portion 47 of the nuclear fuel storage rack 17, an adapter 81 is attached to the frame 44, an adapter 71 is attached to one cell partition 45, and the other cell partition is installed. The adapter 91 is attached to 45, and the adapter 61 is attached to the cell partition wall 46, whereby the width W11 (cell accommodating portion 47A) is adjusted. On the other hand, the BWR fuel assembly 30 has, for example, a plurality of fuel rods 21 arranged in an 8 × 8 square lattice and has a width W21. Therefore, the cell accommodating portion 47A adjusted to the width W11 can appropriately accommodate the BWR fuel assembly 30 having the width W21. In this case, when the BWR fuel assembly 30 is accommodated in the cell housing portion 47A to which the adapters 61, 71, 81, 91 are mounted, the guide surfaces of the adapters 61, 71, 81, 91 and the BWR fuel The dimensions of the thicknesses T61, T71, T81, T91 of the adapters 61, 71, 81, 91 are set so that a predetermined gap S2 is secured between the side surfaces of the aggregate 30.

  In this case, the adapters 61 and 81 are disposed at positions facing each other, the adapters 71 and 91 are disposed at positions facing each other, and the adapters 71 and 91 are disposed between the adapters 61 and 81. Therefore, the widths W61 and W81 of the adapters 61 and 81 are set to the same size, and the widths W71 and W91 of the adapters 71 and 91 are set to the same size. In addition, the widths W61 and W81 of the adapters 61 and 81 are set to be almost the same as the width W1 of the cell housing portion 47 or slightly smaller for easy mounting. The widths W71 and W91 of the adapters 71 and 91 are for BWR. The width W11 of the cell housing portion 47A of the fuel assembly 30 is substantially the same as the width W11 or is set slightly smaller to facilitate mounting.

  Similarly, the thicknesses T61, T71, T81, and T91 of the adapters 61, 71, 81, and 91 can be similarly accommodated in the other cell accommodating portions 47A so that the BWR fuel assemblies 30 can be appropriately accommodated with a predetermined gap S2. And dimensions of widths W61, W71, W81, and W91 are set.

  By the way, the PWR fuel assembly 20 is not limited to a plurality of fuel rods 21 arranged in a 17 × 17 square lattice shape, but a plurality of fuel rods 21 arranged in a 14 × 14 square lattice shape. Also, the BWR fuel assembly 30 includes a plurality of fuel rods 31 arranged in a square lattice such as 8 × 8 or 7 × 7, and the widths thereof are different. .

  As described above, in the nuclear fuel storage rack according to the first embodiment, the plurality of cell storage portions 47 and 47A that are partitioned by the frame body 44 and the cell partition walls 45 and 46 and can store the fuel assemblies 20 and 30; Adapters 61, 71, 81, 91 that are detachably mounted so as to sandwich the body 44 and the cell partition walls 45, 46 and can adjust the width of the cell accommodating portion 47 are provided.

  Therefore, by simply mounting the adapters 61, 71, 81, 91 on the frame body 44 and the cell partition walls 45, 46 constituting the cell housing portion 47, the width W1 of the cell housing portion 47 is changed to the width W11 of the cell housing portion 47A. Since the BWR fuel assemblies 30 having different dimensions are accommodated in the cell accommodating portion 47 that accommodates the PWR fuel assemblies 20, the thickness corresponding to the dimensions of the BWR fuel assemblies 30 is adjusted. It is only necessary to prepare the adapters 61, 71, 81, and 91, which can simplify the structure and suppress an increase in manufacturing cost.

  In the nuclear fuel storage rack of the first embodiment, the cell accommodating portion 47 is formed in a quadrangular prism shape defined by the four partition walls 45 and 46 (or the frame body 44), and the four partition walls 45 and 46 (or the frame body 44). Adapters 61, 71, 81, and 91 are mounted, respectively. Accordingly, the size of the cell accommodating portion 47 can be appropriately adjusted to the cell accommodating portion 47A of the BWR fuel assembly 30 to be accommodated.

  In the nuclear fuel storage rack according to the first embodiment, the base plate 42 is fixed to the lower part of the rack body 41 constituting the plurality of cell housing portions 47 and 47A, and the plurality of leg portions 43 are fixed to the lower part of the base plate 42. Cooling water holes 54 and 55 are formed in 42 to communicate the cell housing portions 47 and 47A with the outside. Therefore, when the nuclear fuel storage rack 17 is installed in the spent fuel pool 16, the fuel assemblies 20 and 30 can be properly supported and effectively cooled.

  In the nuclear fuel storage rack of the first embodiment, the adapters 61, 71, 81, 91 have such thicknesses that a predetermined gap S2 is secured between the adapters 61, 71, 81, 91 and the BWR fuel assembly 30 accommodated in the cell accommodating portion 47A. Is set. Therefore, the predetermined gap S2 is secured between the adapters 61, 71, 81, 91 and the BWR fuel assembly 30, so that the BWR fuel assembly 30 can be easily put in and out of the cell housing portion 47A. In addition, the application of an excessive impact load to the BWR fuel assembly 30 can be suppressed, and the BWR fuel assembly 30 can be accommodated safely.

  In the nuclear fuel storage rack of the first embodiment, the adapters 61, 71, 81, 91 are in contact with the flat portions of the frame body 44 and the cell partition walls 45, 46 and are positioned in the width direction in the cell housing portion 47 </ b> A. 82 and guide guides 63 and 83 that can be supported in contact with the side portion of the BWR fuel assembly 30 accommodated in the cell accommodating portion 47A. Accordingly, the adapters 61, 71, 81, 91 are appropriately positioned by the ribs 62, 82, so that the cell accommodating portion 47 A can be adjusted to an appropriate width. At this time, the cell is guided by the guide guides 63, 83. The BWR fuel assembly 30 housed in the housing portion 47A can be properly supported.

  In the nuclear fuel storage rack of the first embodiment, the adapters 61, 71, 81, 91 have two guide guides that respectively support the side portions of the BWR fuel assembly 30 housed in the two adjacent cell housing portions 47 </ b> A. 63, 83. Therefore, the guide guides 63 and 83 of the BWR fuel assembly 30 can be attached to the two cell housing portions 47A only by attaching one adapter 61, 71, 81, 91 to the frame body 44 and the cell partition walls 45, 46. Therefore, it is possible to reduce the cost.

  In the nuclear fuel storage rack of the first embodiment, the adapters 61, 71, 81, 91 are formed with inclined surfaces 65, 85 in which the width of the cell accommodating portion 47 </ b> A increases toward the upper end portion. Accordingly, the BWR fuel assembly 30 is easily accommodated in the cell accommodating portion 47A whose width is adjusted by the adapters 61, 71, 81, 91 using the inclined surfaces 65, 85 of the adapters 61, 71, 81, 91 as guide surfaces. be able to. The adapters 61, 71, 81, 91 may be replaced with the adapters 71, 61, 91, 81.

  In the nuclear fuel storage rack of the first embodiment, a tapered portion 48 having a thickness that decreases upward is formed at the upper ends of the frame body 44 and the cell partition walls 45 and 46. Therefore, the adapters 61, 71, 81, 91 by the tapered portion 48 of the frame body 44 and the cell partition walls 45, 46 can be easily inserted.

  FIG. 19 is a longitudinal sectional view showing a nuclear fuel storage rack according to a second embodiment of the present invention, FIG. 20 is a plan view of a lifting platform used in the nuclear fuel storage rack of the second embodiment, and FIG. 21 is a lifting platform. FIG. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the second embodiment, as illustrated in FIG. 19, the nuclear fuel storage rack 17 includes a rack body 41, a base plate 42, and four leg portions 43. The rack body 41 is configured such that a plurality of cell storage portions 47 are partitioned and formed by combining a plurality of cell partition walls 45 and 46 in a rectangular tube-shaped frame body 44 so as to form a lattice shape. The cell accommodating portions 47 and 47A can accommodate the PWR fuel assemblies 20A and the BWR fuel assemblies 30.

  That is, the nuclear fuel storage rack 17 has four types that can be detachably mounted so as to sandwich the frame body 44 and the cell partition walls 45 and 46 and adjust the width of the cell storage portion 47 (47A), as in the first embodiment. Adapters 61, 71, 81, 91 (see FIG. 1). Since the adapters 61, 71, 81, 91 are the same as those described in the first embodiment, the description thereof is omitted here.

  In addition, the nuclear fuel storage rack 17 according to the second embodiment is provided with a detachable raising platform 101 at the lower part of the cell housing portions 47 and 47A. As shown in FIGS. 20 and 21, the raising base 101 is configured by connecting a base 102 at the upper end and a bottom base 103 at the lower end by a cylindrical base 104. The pedestal 102 and the bottom seat 103 are respectively formed with cooling water holes 105 and 106 in the central portion, and the stool 104 is formed with a plurality of cooling water holes 107 in the peripheral surface portion. The cooling water holes 105 and 106 are triangles, polygons including squares and rectangles, circles, ellipses, ovals, crosses, petals, or similar shapes, or a combination of these appropriately. can do.

  The PWR fuel assembly 20 </ b> A has the same type and width as the PWR fuel assembly 20 described in the first embodiment, but has a shorter length. For this reason, the nuclear fuel storage rack 17 has the raised base 101 disposed on the base plate 42 in the cell accommodating portions 47 and 47A for accommodating the PWR fuel assemblies 20A. The lower part of the PWR fuel assembly 20 </ b> A is supported by the base plate 42 via the raised platform 101, and the side part is supported by the frame body 44 and the cell partition walls 45 and 46 in the rack body 41.

  In this case, the raising frame 101 is set to have a width slightly smaller than that of the cell housing portions 47 and 47A so that the width of the pedestal 102 and the bottom seat 103 is substantially the same as that of the cell accommodating portions 47 and 47A. Further, the length (height) of the raising platform 101 is set so that the upper end position of the PWR fuel assembly 20 </ b> A supported on the upper portion is slightly lower than the upper end of the rack body 41. Thereby, the fuel assembly accommodated in the cell accommodating portions 47, 47A can be protected from falling objects.

  As described above, in the nuclear fuel storage rack according to the second embodiment, a plurality of cell storage portions 47 and 47A which are partitioned by the frame body 44 and the cell partition walls 45 and 46 and can store the fuel assemblies 20 and 30, and the frame body 44 and adapters 61, 71, 81, 91 that are detachably mounted so as to sandwich the cell partition walls 45, 46 and can adjust the widths of the cell housing portions 47, 47 A, and provided below the cell housing portion 47. A raising stand 101 for supporting the short PWR fuel assembly 20A is provided.

  Accordingly, when the PWR fuel assembly 20A having a short length is accommodated in the cell accommodating portion 47, the raising frame 101 is provided at the lower part of the cell accommodating portion 47, and the PWR fuel assembly 20A is provided on the raising frame 101. , The position of the upper end portion of the short PWR fuel assembly 20A can be arranged at the upper end portion of the cell storage portion 47, similarly to the other BWR fuel assemblies 30. The fuel assembly 20A for PWR can be easily taken in and out by the fuel handling tool.

  In the second embodiment, the raising frame 101 is disposed in the cell housing portion 47 in which the PWR fuel assembly 20 is housed in the first embodiment, so that the short PWR fuel assembly 20A can be accommodated. However, the present invention is not limited to this configuration. For example, the raising platform 101 can be arranged in the cell accommodating portion 47A to which the adapters 61, 71, 81, 91 are attached and the width is adjusted, so that the short BWR fuel assembly can be accommodated. In this case, the adapters 61, 71, 81, 91 are placed on the raising platform 101, and the length (height) L 3 is substantially the same as the length (height) of the BWR fuel assembly 30 to be accommodated. Equal or slightly longer. Alternatively, the adapters 61, 71, 81, 91 are placed on the base plate 42, and the length (height) L3 of the adapters 61, 71, 81, 91 is substantially equal to or slightly longer than the rack body 41. Thus, the widths of the base 102 and the bottom base 103 of the raising base 101 are set to be substantially the same as the width W11 of the cell accommodating portion 471 or slightly smaller in order to facilitate insertion. In addition, when the length (height) L1 of the rack body 41 (cell housing portion 47, 47A) is set to be approximately the same as or slightly longer than the longest fuel assembly, and a fuel assembly shorter than this is accommodated, You may arrange | position the raising stand 101 in the cell accommodating parts 47 and 47A.

  FIG. 22 is a plan view illustrating a nuclear fuel storage rack according to Embodiment 3 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the third embodiment, as shown in FIG. 22, the nuclear fuel storage rack 110 includes a plurality of cell partition walls 45 and 46 that are combined in a rectangular tube-shaped frame 44 so as to form a lattice shape. The cell accommodating portion 47 is configured by being partitioned. As in the first embodiment, the cell housing portion 47 is provided with four types of adapters that are detachably mounted so as to sandwich the frame body 44 and the cell partition walls 45 and 46 and the width of the cell housing portion 47 can be adjusted. 111, 121, 131, 141 are provided. In this case, in the cell accommodating portion 47, the adapters 111, 121, 131, 141 can be attached to the four surrounding frame bodies 44 and the cell partition walls 45, 46, respectively.

  The adapters 111, 121, 131, 141 are ribs 112, 122, serving as positioning portions that contact the flat portions of the frame body 44 and the cell partition walls 45, 46 and perform positioning in the width direction of the cell housing portion 47 (47 A). 132, 142 and guide guides 113, 123, 133, 143 as support portions that can be supported by contacting the side portions of the fuel assemblies (for example, the BWR fuel assemblies 30) accommodated in the cell accommodating portion 47A. Have.

  In this case, the adapters 111 and 131 are disposed at positions facing each other, and the adapters 121 and 141 are disposed at positions facing each other. The opposing adapters 111 and 131 are arranged so as to be shifted in the width direction, and the opposing adapters 121 and 141 are arranged so as to be shifted in the width direction. That is, the four adapters 111, 121, 131, 141 are disposed so as to be shifted to one side in the width direction of the cell housing portion 47 (47 </ b> A), thereby forming a bowl shape. Therefore, the four adapters 111, 121, 131, 141 are set to have the same width and the same thickness as that of the first embodiment, when the BWR fuel assembly 30 is accommodated, a predetermined gap is secured. To be set.

  As described above, in the nuclear fuel storage rack according to the third embodiment, the cell body 47 and 47A that are partitioned by the frame body 44 and the cell partition walls 45 and 46 and can store the fuel assemblies 20 and 30, and the frame body 44 and adapters 111, 121, 131, 141 that are detachably mounted so as to sandwich the cell partition walls 45, 46 and can adjust the widths of the cell housing portions 47, 47A are provided. 141 is mounted shifted in the width direction of the cell accommodating portions 47 and 47A.

  Accordingly, since the adapter can be adjusted to the width of the cell accommodating portion 47A simply by attaching the adapters 111, 121, 131, 141 to the frame body 44 and the cell partition walls 45, 46 constituting the cell accommodating portion 47, different types of The fuel assembly can be easily accommodated, and at this time, the adapters 111, 121, 131, 141 are attached while being shifted in the width direction of the cell accommodating portion 47A. The width can be made the same size, and the types of adapters 111, 121, 131, 141 can be reduced to improve productivity, and the production cost can be reduced.

  23 is a front view of a first adapter mounted on a nuclear fuel storage rack according to Embodiment 4 of the present invention, FIG. 24 is a side view of the first adapter, FIG. 25 is a perspective view of the first adapter, and FIG. Is a front view of the second adapter mounted on the nuclear fuel storage rack, FIG. 27 is a side view of the second adapter, FIG. 28 is a cross-sectional view of the second adapter, and is a cross-sectional view of FIG. FIG. 6 is a plan view showing a nuclear fuel storage rack of Example 4. The basic configuration of the nuclear fuel storage rack of the present embodiment is substantially the same as that of the first embodiment described above, and a member having the same function as that of the first embodiment described above with reference to FIG. Are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the fourth embodiment, as shown in FIGS. 1 and 29, the nuclear fuel storage rack 210 is assembled by combining a plurality of cell partition walls 45 and 46 into a lattice shape in a frame body 44 having a rectangular tube shape. The plurality of cell accommodating portions 47 are configured to be partitioned. Further, the nuclear fuel storage rack 210 is detachably mounted so as to sandwich the frame body 44 and the cell partition walls 45 and 46, and four types of adapters 211, 211, 231, A plurality of 241 are included. In this case, the adapters 211, 221, 231, and 241 can be attached to the surrounding four frame bodies 44 and the cell partition walls 45 and 46 in the cell accommodating portion 47, respectively.

  As shown in FIGS. 23 to 25, the adapter 211 is in contact with the flat portions of the frame body 44 and the cell partition walls 45 and 46 and performs positioning in the width direction in the cell housing portion 47 (47A) and the cell housing. A plurality (two in this embodiment) of guide guides 212 as support portions that can be in contact with and supported by the side of a fuel assembly (for example, the BWR fuel assembly 30) accommodated in the portion 47A; A connection fitting 213 for connecting the two guide guides 212 is provided.

  Each guide guide 212 is formed by forming the outer peripheral portion of the plate material in an inverted U shape, and is formed with two guide surfaces 214 that are substantially parallel to each other. Two symmetrical inclined surfaces 215 are formed. In this case, the guide guide 212 preferably sets the angle of the inclined surface 215 to 60 degrees or less with respect to the guide surface 214. Each guide guide 212 is formed in an inverted U shape by forming a groove portion 216 opened downward in the center, and the width of the groove portion 216 is slightly larger than the thickness of the frame body 44 and the cell partition walls 45 and 46. The length is set to be substantially equal to the length of the frame body 44 and the cell partition walls 45 and 46. In addition, when the fuel assembly accommodated in the nuclear fuel storage rack 210 protrudes from the rack body 41, the adapters 211, 221, and so on do not protrude from the adapters 211, 221, 231, and 241. 231 and 241 are also lengthened. When a fuel assembly shorter than the length of the rack main body 41 is accommodated, the raised base 101 is placed on the base plate 42 in the cell accommodating portions 47 and 47A, and the upper end of the fuel assembly is placed on the rack main body. Raise to near the top of

  The two guide guides 212 are connected by a plurality of connection fittings 213 so as to form a predetermined interval. The connection fitting 213 is fixed so as to penetrate both sides of the groove portion 216 in each guide guide 212.

  The adapter 221 has the same shape as the adapter 211, and includes a guide guide 222 and a connection fitting 223, as shown in FIG. 29, and is set to be narrower than the adapter 211.

  As shown in FIGS. 26 to 28, the adapter 231 contacts the flat portions of the frame body 44 and the cell partition walls 45 and 46, thereby positioning the cell housing portion 47A in the width direction and the cell housing portion 47A. Two guide guides 232 and a support plate 233 as support portions that can be supported by being in contact with the side portion of the fuel assembly to be accommodated (for example, the BWR fuel assembly 30), and a connection for connecting the two guide guides 232 And a metal fitting 234.

  Each guide guide 232 has a guide surface 235 formed on one side of the plate material, and an inclined surface 236 whose thickness decreases upward at the upper end. In this case, the guide guide 232 preferably sets the angle of the inclined surface 236 to 60 degrees or less with respect to the guide surface 235. Each guide guide 232 has a groove 237 formed on the side opposite to the guide surface 235 and an upper end fixed to the support plate 233. In this case, the width of the groove 237 is set to be slightly larger than the thickness of the frame body 44 and the cell partition walls 45 and 46, and the length is set substantially equal to the length of the frame body 44 and the cell partition walls 45 and 46.

  The two guides 232 are connected by a plurality of connection fittings 234 so as to form a predetermined interval. The connection fitting 234 is fixed so as to penetrate the side of the groove 237 in each guide guide 232.

  As shown in FIG. 29, in the nuclear fuel storage rack 210 of the fourth embodiment, the above-described four types of adapters 211, 221, 231, and 241 are attached to the cell housing portion 47 to adjust the width of the cell housing portion 47A. The BWR fuel assembly 30 can be accommodated. That is, in the nuclear fuel storage rack 210, the adapter 231 is attached to the surrounding frame body 44, the adapters 221 and 241 are attached to the cell partition wall 45, and the adapter 211 is attached to the cell partition wall 46. The width of 47A is adjusted to a width that can properly accommodate the BWR fuel assembly 30. When the BWR fuel assembly 30 is accommodated in the cell accommodating portion 47A in which each adapter 211, 221, 231, 241 is mounted, the guide surface of each adapter 211, 221, 231, 241 and the BWR fuel assembly The thickness dimension of each adapter 211, 221, 231, 241 is set so that a predetermined gap S2 is secured between the body 30 and the side surface.

  In this case, the adapters 211 and 231 are disposed at positions facing each other, the adapters 221 and 241 are disposed at positions facing each other, and the adapters 221 and 241 are disposed between the adapters 211 and 231. Therefore, the widths of the adapters 211 and 231 are set to the same dimensions as the widths W61 and W81 of the adapters 61 and 81, and the widths of the adapters 221 and 241 are set to the same dimensions as the widths W71 and W91 of the adapters 71 and 91. The widths of the adapters 211 and 231 are set to be approximately equal to the width W1 of the cell accommodating portion 47 or slightly smaller for easy insertion, and the widths of the adapters 221 and 241 are substantially equal to the width W11 of the cell accommodating portion 471 or It is set slightly smaller to facilitate insertion.

  As described above, in the nuclear fuel storage rack according to the fourth embodiment, the cell body 47 and the cell bulkheads 45 and 46, which are partitioned by the frame body 44 and the cell partition walls 45 and 46, can accommodate the PWR fuel assemblies 20, Adapters 211, 221, 231, and 241 that are detachably mounted so as to sandwich the cell partition walls 45 and 46 and can be adjusted to the width of the cell accommodating portion 47A that can accommodate the BWR fuel assembly 30 are provided.

  Therefore, by simply mounting the adapters 211, 221, 231, and 241 on the frame body 44 and the cell partition walls 45 and 46 constituting the cell housing portion 47, the width of the cell housing portion 47 is accommodated to accommodate the BWR fuel assembly 30. Since it can be adjusted to the width of the possible cell accommodating portion 47A, when the BWR fuel assemblies 30 having different dimensions are accommodated in the cell accommodating portion 47 accommodating the PWR fuel assemblies 20, the BWR fuel assemblies are accommodated. Adapters 211, 221, 231, 241 having a thickness corresponding to 30 dimensions may be prepared, and the structure can be simplified and an increase in manufacturing cost can be suppressed.

  In the nuclear fuel storage rack of the fourth embodiment, the guide surfaces 214, 225, 235, 245 and the inclined surfaces 215, 227, 236 are provided on the end surfaces of the guide guides 212, 222, 232, 242 of the adapters 211, 221, 231, 241, respectively. , 247 are formed. Therefore, the material amount of the adapters 211, 221, 231, 241 can be reduced and the cost can be reduced. The adapters 221 and 241 may be replaced with the adapters 211 and 231.

  FIG. 30 is a plan view illustrating a nuclear fuel storage rack according to the fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the fifth embodiment, as shown in FIG. 30, the nuclear fuel storage rack 260 includes a plurality of cell partition walls 45 and 46 combined in a lattice shape in a frame body 44 having a rectangular tube shape. The cell accommodating portion 47 is configured by being partitioned. As in the first embodiment, the cell accommodating portion 47 is detachably mounted so as to sandwich the frame body 44 and the cell partition walls 45 and 46, and the width of the cell accommodating portion 47 (47A) can be adjusted. A plurality of types of adapters 261 271 281 291 are provided. In this case, the adapter 261, 271, 281 and 291 can be attached to the surrounding four frame bodies 44 and the cell partition walls 45 and 46 in the cell accommodating portion 47, respectively.

  The adapters 261 and 281 are in contact with the flat portions of the frame body 44 and the cell partition walls 45 and 46 and are positioned in the cell housing portion 47 in the width direction and a fuel assembly (eg, a fuel assembly housed in the cell housing portion 47A). , Two guide guides 262 and 282 as support portions that can be supported by being in contact with the side portion of the BWR fuel assembly 30), and connecting fittings 263 and 284 for connecting the two guide guides 262 and 282. doing. In addition, the adapters 271 and 291 are in contact with the flat portions of the frame body 44 and the cell partition wall 45 to perform positioning in the width direction of the cell housing portion 47A and the fuel assemblies (for example, the cell housing portion 47A). The two guide guides 272 and 292 and the support plates 273 and 293 as support portions that can be supported by contacting the side portion of the BWR fuel assembly 30), and the connection fitting 273 that connects the two guide guides 272 and 292 , 294.

  In this case, the adapters 261 and 281 are disposed at positions facing each other, and the adapters 271 and 291 are disposed at positions facing each other. The opposing adapters 261 and 281 are arranged so as to be shifted in the width direction, and the opposing adapters 271 and 291 are arranged so as to be shifted in the width direction. That is, the four adapters 261, 271, 281, and 291 are disposed so as to be shifted to one side in the width direction of the cell housing portion 47, thereby forming a bowl shape. Therefore, the four adapters 261, 271, 281, 291 are set to have the same width, and the thickness is the same as that of the fourth embodiment. When the BWR fuel assembly 30 is accommodated, the predetermined gap S2 is set. It is set to be secured.

  As described above, in the nuclear fuel storage rack of the fifth embodiment, the cell body 47 and 47A which are partitioned by the frame body 44 and the cell partition walls 45 and 46 and can store the fuel assemblies 20 and 30, and the frame body 44 and adapters 261, 271, 281, 291 that are detachably mounted so as to sandwich the cell partition walls 45, 46 and can adjust the widths of the cell accommodating portions 47, 47A. 291 is mounted while being shifted in the width direction of the cell accommodating portion 47.

  Therefore, the width of the cell housing portion 47, 47A can be adjusted simply by attaching the adapters 261, 271, 281, 291 to the frame body 44 and the cell partition walls 45, 46 constituting the cell housing portion 47. Different types of fuel assemblies can be easily accommodated. At this time, the adapters 261, 271, 281 and 291 are mounted while being shifted in the width direction of the cell accommodating portions 47 and 47A. , 281, 291 can have the same dimensions, and the types of adapters 261, 271, 281, 291 can be reduced to improve productivity, and the production cost can be reduced.

  FIG. 31 is a plan view showing a nuclear fuel storage rack according to Embodiment 6 of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the sixth embodiment, as shown in FIG. 31, the nuclear fuel storage rack 300 is formed by combining a plurality of cell partition walls 45 and 46 into a lattice shape in a frame body (not shown) having a rectangular tube shape. The plurality of cell accommodating portions 47 are configured to be partitioned. The cell housing portion 47 includes a plurality of two types of adapters 301 and 302 that are detachably mounted so as to sandwich the cell partition walls 45 and 46 and can adjust the width of the cell housing portion 47 (47A). Yes. In this case, in the cell accommodating portion 47, the adapters 301 and 302 can be attached to the surrounding four cell partition walls 45 and 46, respectively.

  In this case, the adapters 301 and 302 have substantially the same configuration as the adapters 81 and 91 (see FIG. 1) in the first embodiment. The cell accommodation for accommodating the BWR fuel assembly 30 is made by making the thicknesses T301 and T302 of the adapters 301 and 302 substantially equal to the difference between the width W1 of the cell accommodating portion 47 and the width W11 of the cell accommodating portion 47A. A portion 47A is formed. The width W301 of the adapter 301 is substantially equal to the width W81 of the adapter 81 in the first embodiment, and the width W302 of the adapter 302 is substantially equal to the value obtained by subtracting the thickness T301 of the adapter 301 from the width W1 of the cell accommodating portion 47. It is. The adapter 302 is disposed so as to be orthogonal to the adapter 301, and the opposing adapters 301 and 302 are disposed so as to protrude toward the different cell housing portions 47A.

  As described above, in the nuclear fuel storage rack of the sixth embodiment, the plurality of cell housing portions 47 and 47A which are partitioned by the frame body and the cell partition walls 45 and 46 and can store the fuel assemblies 20 and 30, the frame body and Adapters 301 and 302 that are detachably mounted so as to sandwich the cell partition walls 45 and 46 and can adjust the widths of the cell storage portions 47 and 47A are provided, and the cell storage portion 47A is formed by the two types of adapters 301 and 302. Is formed.

  Accordingly, since the width of the cell accommodating portions 47 and 47A can be adjusted simply by attaching the adapters 301 and 302 to the frame body and the cell partition walls 45 and 46 that constitute the cell accommodating portion 47, different types of fuel assemblies The body can be easily accommodated. At this time, two types of adapters 301 and 302 are prepared, and the cell accommodating portion 47A is formed by the two adapters 301 and 302, thereby reducing the types and the number of the adapters. This makes it possible to reduce adapter production costs and installation work costs.

  FIG. 32 is a longitudinal sectional view showing a nuclear fuel storage rack according to Embodiment 7 of the present invention.

  In the seventh embodiment, as shown in FIG. 32, the nuclear fuel storage rack 310 includes a rack body 311, a base 312, and a plurality of legs (not shown). The rack body 311 is configured such that a plurality of rack cells 321 having a rectangular tube shape are arranged in a lattice shape, and are integrally fixed by an upper support lattice 322 and a lower support lattice 323. Each rack cell 321 has a cell accommodating portion 313 formed therein. The base 312 has a hollow quadrangular prism shape formed by a base plate 331, a bottom plate 332, and a side plate 333 having a square tube shape, and a plurality of reinforcing plates 334 are fixed inside, and is fixed to a lower portion of the rack body 331. ing. Cooling water holes 335 are formed in the substrate 331, the bottom plate 332, the side plate 333, and the reinforcing plate 334.

  The nuclear fuel storage rack 310 includes a plurality of adapters 341 that can adjust the width of the cell accommodating portion 313, and the width of the cell accommodating portion 313 corresponding to the PWR fuel assembly 20 is set to the BWR fuel assembly 30. The width of the cell accommodating portion 313A can be adjusted according to the above. In this case, the cell accommodating portion 313 is formed by being partitioned into four inner walls around the rack cell 321. The adapter 341 can be mounted so as to be sandwiched from above with respect to each wall portion of two adjacent rack cells 321. The adapter 341 has, for example, substantially the same configuration as the adapters 61 and 71 (see FIG. 1) in the first embodiment, but the length (height) is the length of the rack cell 321 (cell accommodating portion 313) ( It is set longer than (height).

  As described above, in the nuclear fuel storage rack according to the seventh embodiment, the plurality of rack cells 321 are arranged in a lattice shape, and the fuel assemblies 20 and 30 are accommodated by being fixed integrally by the upper support lattice 322 and the lower support lattice 323. A plurality of possible cell accommodating portions 313 and 313A and an adapter 341 that is detachably mounted so as to sandwich the wall portion of two adjacent rack cells 321 and can adjust the width of the cell accommodating portions 313 and 313A; Yes.

  Accordingly, since the width of the cell accommodating portion 47 can be adjusted to the width of the cell accommodating portion 47A simply by attaching the adapter 341 to the rack cell 321 constituting the cell accommodating portion 313, different types of fuel assemblies can be easily formed. Can be accommodated.

  In the above-described embodiment, one adapter is detachably attached to one partition wall that divides the cell accommodating portion. However, a plurality of adapters are combined, and the plan view is L-shaped, U-shaped, B-shaped, etc. And one adapter may be detachably attached to the plurality of partition walls. Alternatively, a plurality of adapters may be linearly coupled to adjacent cell storage portions that are linear, and one adapter may be detachable from the plurality of partition walls.

  In the above-described embodiment, the guide surface formed on the support portion of the adapter is continuously formed in the vertical direction, but may be partially provided. Further, there is a case where the rib is not attached to the adapter when there is no great difference between the width of the cell accommodating portion 47 and the width of the cell accommodating portion 47A.

  In the above-described embodiment, the cell accommodating portion has a size capable of accommodating a PWR fuel assembly in which a plurality of fuel rods are arranged in a 17 × 17 square lattice shape. In this case, since this type of nuclear fuel has the maximum size, it is possible to accommodate all of the nuclear fuel having a smaller size by considering the size of the adapter. However, the present invention is not limited to this configuration, and the cell housing portion may be formed corresponding to the dimensions of another type of nuclear fuel. In addition, the cell accommodating portion has a size capable of accommodating a fuel assembly for PWR in which a plurality of fuel rods are arranged in a 17 × 17 square lattice shape, and the cell accommodating portion to which the adapter is attached is a 14 × plurality of fuel rods. It is good also as a dimension which can accommodate the fuel assembly for PWR arranged in 14 square lattices. That is, the nuclear fuel storage rack of the above-described embodiment can accommodate the PWR fuel assembly 20 and the BWR fuel assembly 30 of different types together, but the PWR fuel assembly 20 of different types or the BWR The fuel assembly 30 may be accommodated together. The adapter also has an effect of reinforcing the structural strength of the rack cell and has a function of preventing the criticality of the adjacent fuel assembly.

DESCRIPTION OF SYMBOLS 11 Reactor containment vessel 12 Pressurized water reactor 13 Steam generator 16 Spent fuel pool 17,110,210,260,300,310 Nuclear fuel storage rack 20 Fuel assembly for PWR (nuclear fuel)
30 BWR fuel assembly (nuclear fuel)
41 Rack body 42 Base 43 Leg 44 Frame 45, 46 Cell partition 47, 47A Cell housing 54, 55 Cooling water hole 61, 71, 81, 91, 111, 121, 131, 141 Adapter 62, 82, 112 , 122, 132, 142 Rib (positioning part)
63, 83, 113, 123, 133, 143 Guide guide (supporting part)
101 Raising platform 211, 221, 231, 241, 261, 271, 281, 291 Adapter 212, 222, 232, 242, 262, 272, 282, 292 Guide guide (positioning part, support part)
213, 223, 234, 244, 263, 273, 284, 294 Connection fitting 233, 243, 283, 293 Support plate (positioning part, support part)
301, 302 Adapter 311 Rack main body 312 Base 321 Rack cell 313, 313A Cell housing

Claims (12)

A plurality of cell storage portions partitioned by a partition wall and capable of storing nuclear fuel;
An adapter that is detachably mounted so as to sandwich the partition wall and is capable of adjusting the width of the cell accommodating portion;
A nuclear fuel storage rack characterized by comprising:   2. The nuclear fuel storage rack according to claim 1, wherein the cell accommodating portion has a quadrangular prism shape defined by the four partition walls, and the adapters are respectively attached to the four partition walls.   A base is fixed to the lower part of the plurality of cell housing parts, a plurality of legs are fixed to the lower part of the base, and a cooling water hole is formed in the base for communicating the cell housing part and the outside. The nuclear fuel storage rack according to claim 1, wherein the nuclear fuel storage rack is provided.   4. The thickness of the adapter is set such that a predetermined gap is secured between the adapter and the nuclear fuel accommodated in the cell accommodating portion. 5. The nuclear fuel storage rack according to one.   The adapter is in contact with each flat surface portion of the partition wall to perform positioning in the width direction of the cell accommodating portion, and a support that can be supported by contacting a side portion of the nuclear fuel accommodated in the cell accommodating portion. The nuclear fuel storage rack according to any one of claims 1 to 4, wherein the nuclear fuel storage rack is provided.   6. The nuclear fuel storage rack according to claim 5, wherein the adapter includes two support portions that respectively support the side portions of the nuclear fuel stored in two adjacent cell storage portions. 7.   The nuclear fuel storage rack according to any one of claims 1 to 6, wherein the adapter is formed with an inclined surface at an upper end portion in which the width of the cell accommodating portion is increased upward.   The nuclear fuel storage rack according to any one of claims 1 to 7, wherein the partition wall is formed with a tapered portion whose thickness decreases upward at an upper end portion.   The nuclear fuel storage rack according to any one of claims 1 to 8, wherein a raising platform is provided at a lower portion of the cell housing portion.   The nuclear fuel storage rack according to any one of claims 1 to 9, wherein the adapter is mounted to face the four partition walls constituting the cell accommodating portion.   The nuclear fuel storage rack according to any one of claims 1 to 9, wherein the adapter is mounted so as to face the four partition walls constituting the cell housing portion and be shifted in the width direction.   The cell accommodating part is set to a width capable of accommodating the nuclear fuel for PWR, and the adapter is set to a thickness capable of accommodating the nuclear fuel for BWR in the cell accommodating part when mounted on the partition wall. The nuclear fuel storage rack according to any one of claims 1 to 11, wherein:

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