JP2019163972A - Heat transfer testing device of container used for transporting and/or storing spent fuel - Google Patents

Abstract

To provide a heat transfer testing device capable of efficiently performing a heat transfer test by reducing time required for inserting a pseudo heat source heated to temperature obtained by simulating the amount of heat generation of a spent fuel into each of a plurality of storage spaces demarcated by a lattice-like basket in preparation work of a heat transfer test.SOLUTION: When a temporary cover is lowered toward a container body from above the container body in a state in which each of a plurality of storage spaces is open upward, at least movement to a direction of separating downward from the temporary cover is restricted among respective movements of a plurality of pseudo heat sources such that each of the plurality of pseudo heat sources is maintained to be suspended with respect to the temporary cover, and a lower end of each of the plurality of pseudo heat sources abuts on a bottom face of the container body in a state in which each of the plurality of pseudo heat sources is stored in a corresponding storage space and the temporary cover is mounted to the container body, thus canceling a state in which each of the plurality of pseudo heat sources is suspended with respect to the temporary cover.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a test apparatus for confirming performance required for a container used for transporting and / or storing spent fuel taken out of a nuclear reactor, and more specifically, heat transfer for confirming a heat removal function of the container. The present invention relates to a heat transfer test apparatus used for testing.

  A container (hereinafter referred to as a cask) used for transporting and / or storing spent fuel taken out of a nuclear reactor is known. The spent fuel contained in the cask generates heat of up to several tens of kW per cask and emits a considerable amount of gamma rays and neutrons. Therefore, a high safety function is required for the cask.

  Safety functions include a heat removal function, a sealing function, a shielding function, and a criticality prevention function. The heat removal function is a function for releasing the heat of the spent fuel and appropriately lowering the temperatures of the components of the cask and the spent fuel. The sealing function is a function of confining spent fuel as a radioactive substance in the cask. The shielding function shields gamma rays and neutrons emitted from spent fuel and reduces the dose rate outside the cask to prevent radiation exposure. The criticality prevention function is a function that prevents criticality due to fission of uranium 235 remaining in the spent fuel.

  The safety functions required for the cask need to be verified before the cask is actually used. Of the safety functions required for the cask, a heat transfer test is performed for heat removal performance.

  In the heat transfer test, for example, as described in Non-Patent Documents 1 and 2 below, a heater that generates heat corresponding to the calorific value of the spent fuel is partitioned by a grid-like basket disposed in the cask body. The surface of the cask body and basket is measured with a thermocouple to confirm that it does not exceed the temperature obtained by analysis at the time of design.

Mitsubishi Heavy Industries Technical Report Vol. 35 No. 4 pages 286-289 Hitachi Review Vol. 86 no. 2 pp. 209-212

  However, in the heat transfer test described in Non-Patent Documents 1 and 2, as the preparatory work, it is necessary to insert a heater in each of the plurality of housing spaces, so that the preparatory work takes time, and as a result It is difficult to conduct a heat transfer test efficiently.

  The purpose of the present invention is to shorten the time required for inserting a simulated heat source simulating the calorific value of spent fuel into each of a plurality of accommodation spaces defined by a grid-like basket, among preparation work for a heat transfer test. Then, it is providing the heat-transfer test apparatus which can perform a heat-transfer test efficiently.

  In order to achieve the above object, the inventor of the present application has proceeded with investigation focusing on simultaneously inserting each of the plurality of simulated heat sources into the corresponding accommodation space among the plurality of accommodation spaces. As a result, if a plurality of simulated heat sources are attached to the temporary lid used in place of the original lid of the container in the heat transfer test, a plurality of simulated heat sources can be handled integrally. The present inventors have found that each of the plurality of simulated heat sources can be simultaneously inserted into the corresponding accommodation space among the plurality of accommodation spaces. However, if a plurality of simulated heat sources are attached so as not to move relative to the temporary lid, the movement of spent fuel in the accommodation space (i.e., simply being inserted into the accommodation space, The movement of spent fuel that is allowed to move in an arbitrary direction) cannot be simulated. Therefore, the inventor of the present application has further studied based on the above findings. As a result, as a coupling mechanism for attaching each of the plurality of simulated heat sources to the temporary lid, the simulated heat source is kept suspended from the temporary lid when the simulated heat source is inserted into the accommodating space, and the simulated heat source accommodating space If the one that releases the state where the simulated heat source is suspended from the temporary lid when the insertion into the container body is completed and the temporary lid is attached to the container body is used, the spent fuel in the accommodation space is simulated It came to obtain the knowledge that it was possible. The present invention has been completed based on such findings.

  The heat transfer test apparatus according to the present invention is configured to transport and / or transport the spent fuel in a state where the spent fuel is accommodated in each of a plurality of accommodation spaces defined in a lattice-like basket and extending in a predetermined direction in parallel with each other. An opening for inserting the basket from the outside, which is used for storage, is formed, and a container lid that is attached to the container body so as to cover the opening of the container body. A heat transfer test apparatus used in a heat transfer test for confirming a heat removal function of a container including a temporary lid that can be attached to the container body instead of the container lid, and the plurality of housings A plurality of simulated heat sources each simulating the amount of heat generated from the spent fuel, and each of the plurality of simulated heat sources are individually connected to the temporary lid. A plurality of coupling mechanisms, wherein the plurality of coupling mechanisms descend the temporary lid toward the container body from above the container body in a state where each of the plurality of receiving spaces is open upward. When moving the plurality of simulated heat sources, the movement of each of the simulated heat sources in at least a direction away from the temporary lid so as to maintain the suspended state with respect to the temporary lid. In a state where each of the plurality of simulated heat sources is housed in the corresponding housing space and the temporary lid is attached to the container body, the lower ends of the plurality of simulated heat sources are The state where each of the plurality of simulated heat sources is suspended from the temporary lid is released by contacting the bottom surface.

  In the above heat transfer test apparatus, when the temporary lid is attached to the container body, a plurality of simulated heat sources can be handled together, so that each of the plurality of simulated heat sources can be simultaneously inserted into the corresponding accommodating space. it can. As a result, the time required for the operation of inserting the simulated heat source into each of the plurality of accommodation spaces can be shortened compared to the case where the simulated heat source is inserted into each of the plurality of accommodation spaces. Therefore, in the heat transfer test apparatus, the time required for the heat transfer test preparation work can be shortened and the heat transfer test can be performed efficiently.

  Further, in the above heat transfer test apparatus, each of the plurality of simulated heat sources is released in the accommodation space since each constraint of the plurality of simulated heat sources is released in a state where each of the plurality of simulated heat sources is accommodated in the accommodation space. You can move with. Therefore, it is possible to simulate the movement of the spent fuel stored in each of the plurality of storage spaces (particularly, the movement associated with the change in the mounting state of the container). Therefore, the heat transfer test can be performed under conditions close to the situation where the cask is actually used.

  Preferably, each of the plurality of simulated heat sources includes a plurality of heater wires arranged so as to extend in the predetermined direction, and each of the plurality of heater wires simulates a heat generation region of the spent fuel. As described above, it has a plurality of heat generation regions formed side by side in the predetermined direction and having different heat generation amounts.

  Alternatively, each of the plurality of simulated heat sources includes a plurality of heat regulation plates arranged apart from each other in the predetermined direction, and the plurality of heat regulation plates simulate the shape of the spent fuel and perform heat convection. The corresponding accommodating space is partitioned into a plurality of heat generating spaces so as to suppress.

  In these cases, since not only the calorific value of the spent fuel but also the calorific region of the spent fuel can be simulated, a more accurate heat transfer test can be performed.

  In the above heat transfer test apparatus, preferably, the plurality of connection mechanisms may be provided on the first hooking portion provided on the temporary lid and the simulated heat source, respectively, and hooked on the first hooking portion. When the temporary lid is lowered toward the container body from above the container body in a state where each of the plurality of storage spaces is open upward, the second hook part is formed. The hook part is hooked on the first hook part by the action of gravity, thereby realizing a state in which each of the plurality of simulated heat sources is suspended from the temporary lid, and each of the plurality of simulated heat sources corresponds to the corresponding When only the temporary lid further descends toward the container main body in a state of being in contact with the bottom surface of the container main body in the accommodating space, the first hooking part is separated from the second hooking part, thereby Each of the number of simulated heat source is movable state is realized in any direction within the accommodation space in which the corresponding.

  In this case, since the hook of the second hooking portion with respect to the first hooking portion is automatically released in a state where each of the plurality of simulated heat sources is housed in the corresponding housing space, there is no special operation from the outside of the container. However, it is possible to realize a state in which the simulated heat source can move in any direction within the accommodation space.

  In the above heat transfer test apparatus, preferably, the first hooking portion is configured such that the temporary lid faces the container body from above the container body in a state where each of the plurality of housing spaces is open upward. A guide portion that is curved or bent so as to protrude toward the simulated heat source when being lowered, and the second hooking portion is closest to the simulated heat source among the guide portions due to the action of gravity. I get caught in the part.

  In this case, since the position where the second hooking part is hooked to the first hooking part can be limited to a specific position (that is, the part closest to the simulated heat source among the guide parts of the first hooking part), a plurality of simulations are performed. When each of the heat sources is suspended from the temporary lid, it is possible to suppress variations in posture when suspended between the plurality of simulated heat sources.

  In the heat transfer test apparatus, preferably, the first hooking portion is attached to the temporary lid at both ends thereof to form an annular hooking portion together with the temporary lid, and the second hooking portion is In order to prevent dropping from one hooking portion, both ends thereof are attached to the simulated heat source in a state where the intermediate portion passes through the annular hooking portion.

  In this case, since the second hooking portion is prevented from falling off from the first hooking portion, the second hooking portion can be reliably shifted from a state where it is not hooked to the first hooking portion to a state where it is hooked again. . Therefore, for example, when the heat transfer test is completed and the temporary lid is removed, the work of simultaneously pulling out each of the plurality of simulated heat sources from the corresponding accommodating space can be stably performed.

  According to the heat transfer test apparatus of the present invention, the time required for preparation of the heat transfer test can be shortened, so that the heat transfer test can be performed efficiently.

It is a schematic diagram which shows schematic structure of the heat-transfer test apparatus by embodiment of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is CC sectional drawing in FIG. It is a perspective view which shows schematic structure of the temperature measuring apparatus with which the heat-transfer test apparatus shown in FIG. 1 is provided. It is drawing which expands and shows a part of FIG. It is drawing which expands and shows other one part of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  A heat transfer test apparatus 10 according to an embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, and 4. FIG. 1 is a schematic diagram showing a schematic configuration of a heat transfer test apparatus 10. 2 is a cross-sectional view taken along line AA in FIG. 3 is a cross-sectional view taken along the line BB in FIG. 4 is a cross-sectional view taken along the line CC in FIG.

  The heat transfer test apparatus 10 is used for a heat transfer test for confirming the heat removal function of the cask. The cask is a container used for transporting and / or storing spent fuel, and includes a container body that accommodates the basket 60 and a container lid that covers an opening of the container body.

  Here, as shown in FIGS. 2, 3, and 4, the basket 60 is formed by combining a plurality of first plates 62 and a plurality of second plates 64 in a lattice pattern. A plurality of storage spaces 66 are formed in the basket 60. The plurality of accommodation spaces 66 extend in a predetermined direction in a state of being parallel to each other. In addition, each opening of the plurality of accommodation spaces 66 has a rectangular shape.

  The heat transfer test device 10 includes a temporary lid 20, a plurality of simulated heat sources 30, a plurality of connection mechanisms 40, and a temperature measurement device 50. Hereinafter, these will be described.

  The temporary lid 20 is attached to the container body instead of the container lid during the heat transfer test. That is, the temporary lid 20 is detachable from the container body. The temporary lid 20 has the same sealing performance as the container lid. The temporary lid 20 has the same heat transfer performance as the container lid.

  Each of the plurality of simulated heat sources 30 is heated to a temperature that simulates the calorific value of the spent fuel. The plurality of simulated heat sources 30 are accommodated one by one in each of the plurality of accommodation spaces 66.

  Each of the plurality of simulated heat sources 30 includes two support plates 31 and 33, a plurality of heat regulation plates 32, and a plurality of heater wires 34.

  The two support plates 31 and 33 are arranged away from each other in the direction in which the accommodation space 66 extends (the vertical direction in FIG. 1). The two support plates 31 and 33 have the same shape and size. In the present embodiment, the two support plates 31 and 33 each have a rectangular plate shape that is slightly smaller than the opening of the accommodation space 66. The support plate 33 is located at the lower end of the simulated heat source 30. That is, the lower surface of the support plate 33 corresponds to the lower surface of the simulated heat source 30.

  The plurality of heat regulation plates 32 are located between the pair of support plates 31 and 33 in the direction in which the accommodation space 66 extends. The plurality of heat regulation plates 32 have the same shape and size. In the present embodiment, the heat regulation plate 32 has a rectangular plate shape that is slightly smaller than the opening of the accommodation space 66. The heat regulation plate 32 has the same shape and size as the support plates 31 and 33.

  Each of the plurality of heater wires 34 extends in a direction in which the accommodation space 66 extends. Each of the plurality of heater wires 34 is disposed through the plurality of heat regulation plates 32. One end of each of the plurality of heater wires 34 is supported by a support plate 31. The other end of each of the plurality of heater wires 34 is supported by a support plate 33. Each of the plurality of heater wires 34 has a plurality of heat generation regions 341. The plurality of heat generating regions 341 are formed side by side in the direction in which the heater wire 34 extends. The heat generation amounts of the plurality of heat generation regions 341 are different from each other. As a method of making the heat generation amounts of the plurality of heat generation regions 341 different from each other, for example, there are a method of changing the number of turns of the conductive wire for each heat generation region 341, a method of changing the power supplied to each heat generation region 341, and the like.

  Here, each of the plurality of heat regulation plates 32 is disposed at a boundary between two adjacent heat generation regions 341. That is, the plurality of heat regulation plates 32 are arranged so as to partition the inside of the accommodation space 66 into a plurality of heat generation spaces 661 according to the plurality of heat generation regions 341.

  The plurality of coupling mechanisms 40 individually couple the plurality of simulated heat sources 30 to the temporary lid 20. Each of the plurality of connection mechanisms 40 includes a first hooking portion 42 and a second hooking portion 44.

  The first hooking portion 42 is provided on the lower surface of the temporary lid 20. The first hook portion 42 has a shape in which a tubular or rod-like member is curved in a semicircular shape, and the whole functions as a guide portion. Both ends of the first hook portion 42 are fixed to the lower surface of the temporary lid 20. The first hook 42 protrudes in a direction perpendicular to the lower surface of the temporary lid 20 and away from the lower surface. The center of the first hook portion 42 is farthest from the lower surface of the temporary lid 20. The first hook portion 42 forms an annular hook portion together with the temporary lid 20.

  The second hooking portion 44 is provided on the upper surface of the support plate 31 included in the simulated heat source 30. The second hooking portion 44 has a shape in which a tubular or rod-like member is bent in a semicircular shape. Both ends of the second hooking portion 44 are fixed to the upper surface of the support plate 31. The second hooking portion 44 projects in a direction perpendicular to the upper surface of the support plate 31 and away from the upper surface. The center of the second hooking portion 44 is farthest from the upper surface of the support plate 31. The second hook 44 and the support plate 31 form an annular hook. An intermediate portion of the second hooking portion 44 passes between the first hooking portion 42 and the temporary lid 20 (that is, an annular hooking portion formed by the first hooking portion 42 and the temporary lid 20). Therefore, the second hooking portion 44 can be hooked with respect to the first hooking portion 42 in a state in which the second hooking portion 44 is prevented from falling off from the first hooking portion 42.

  The temperature measuring device 50 measures the surface temperature of the basket 60 in a state in which at least a part is housed in any one of the plurality of housing spaces 66.

  The temperature measuring device 50 will be described with reference to FIGS. 5, 6, and 7. FIG. 5 is a perspective view showing a schematic configuration of the temperature measuring device 50. 6 is an enlarged view of a part of FIG. FIG. 7 is an enlarged view of another part of FIG.

  The temperature measuring device 50 includes a thermocouple 51 as a contact temperature measuring device and a holding mechanism 52. Hereinafter, these will be described.

  The thermocouple 51 is inserted into any of the plurality of storage spaces 66 and measures the surface temperature on the inner surface of the basket 60 while in contact with the inner surface of the basket 60 that partitions the storage space 66. The thermocouple 51 includes a terminal portion 511 that can contact the inner surface of the basket 60. The terminal portion 511 allows heat conduction from the inner surface of the basket 60 while in contact with the inner surface of the basket 60. The thermocouple 51 is connected to the temporary lid 20 and is movable together with the temporary lid 20.

  The holding mechanism 52 is inserted into any of the plurality of storage spaces 66 to hold the thermocouple 51 at a position where the surface temperature on the inner surface of the basket 60 can be measured. Specifically, the holding mechanism 52 holds the terminal portion 511 included in the thermocouple 51 in a state in which the terminal portion 511 is in contact with the inner surface of the basket 60. The holding mechanism 52 is connected to the temporary lid 20 and is movable together with the temporary lid 20.

  The holding mechanism 52 includes an operation handle 581 as an operated portion, a frame 531, a frame 532, a pair of pipes 54, a pair of pressing plates 55, a pair of springs 56, and a moving mechanism 57. Hereinafter, these will be described.

  The operation handle 581 is disposed so as to be operable from the outside of the container body to which the temporary lid 20 is attached. The operation handle 581 is provided on the expansion joint 58. The expansion joint 58 is disposed in the accommodation hole 22 formed in the temporary lid 20. The expansion joint 58 is a bellows type expansion joint. Thereby, the sealing performance of the temporary lid 20 is ensured.

  The frame 531 suspends the frame 532. The frame 531 and the frame 532 are connected by a pair of pipes 54. A thermocouple 51 is accommodated in each of the pair of pipes 54. The terminal portion 511 included in the thermocouple 51 is located outside the pipe 54.

  The frame 531 is connected to the temporary lid 20. Specifically, the frame 531 is connected to the temporary lid 20 by the hook portion 53 </ b> A of the frame 531 being hooked on the hook portion 24 provided on the lower surface of the temporary lid 20.

  The frame 532 is disposed between the pair of presser plates 55 and supports each of the pair of presser plates 55. The frame 532 is disposed at a position away from the inner surface of the basket 60 that defines the accommodation space 66 in a state of being accommodated in any of the plurality of accommodation spaces 66. The frame 532 has a rectangular frame shape. The frame 532 surrounds the plurality of heater wires 34.

  The pair of presser plates 55 are disposed at positions where they can contact the inner surface of the basket 60 while being accommodated in the container body. The holding plate 55 supports the thermocouple 51. A terminal portion 511 included in the thermocouple 51 is located in a hole 551 formed in the presser plate 55. With the presser plate 55 in contact with the inner surface of the basket 60, the terminal portion 511 contacts the inner surface of the basket 60 together with the presser plate 55. The presser plate 55 is disposed so as to be movable between a position in contact with the inner surface of the basket 60 (contact position) and a position away from the inner surface of the basket 60 (retracted position).

  Each of the pair of springs 56 is disposed between the presser plate 55 and the frame 532, and exerts a biasing force on the presser plate 55 in a direction in which the presser plate 55 is separated from the frame 532. That is, the spring 56 exerts a biasing force on the presser plate 55 in a direction in which the presser plate 55 is moved from the retracted position toward the contact position.

  The moving mechanism 57 moves each of the pair of presser plates 55 in a direction of approaching / separating from the frame 532. The presser plate 55 moves in conjunction with the operation of the operation handle 581. The direction in which the presser plate 55 moves relative to the frame 532 corresponds to the direction in which the operation handle 581 is operated. When the presser plate 55 is brought close to the frame 532, the operation handle 581 is operated in the first direction. When the presser plate 55 is released from the frame 532, the operation handle 581 is operated in the second direction.

  The moving mechanism 57 includes a pair of wires 571, a connection portion 572, and a guide portion 573. Hereinafter, these will be described.

  The pair of wires 571 connect the presser plate 55 and the connection portion 572, respectively. The pair of wires 571 are respectively accommodated in the pipe 54.

  The connecting portion 572 is provided on the expansion joint 58 and moves in accordance with the operation on the operation handle 581, and gives a tensile force to the wire 571 to bring the presser plate 55 close to the frame 532 against the urging force of the spring 56. .

  The guide part 573 guides the movement of the wire 571 accompanying the operation of the operation handle 581. In the present embodiment, the guide portion 573 is realized by the pipe 54 that houses the wire 571. The guide portion 573 has a portion extending in the direction in which the press plate 55 approaches / separates from the frame 532 in the vicinity of the press plate 55. Thus, the direction in which the tensile force of the wire 571 acts on the presser plate 55 is opposite to the direction in which the biasing force of the spring 56 acts on the presser plate 55.

  Subsequently, a heat transfer test using the heat transfer test apparatus 10 will be described. In the heat transfer test, the simulated heat source 30 is inserted into each of a plurality of receiving spaces 66 partitioned by a lattice-like basket 60 disposed in the container body, and the surface temperature of the container body and the basket 60 is measured and designed. Confirm that the temperature determined by analysis is not exceeded.

  When conducting a heat transfer test, prepare for the heat transfer test. Specifically, the heat transfer test device 10 is attached to the container body of the cask. The work will be described below.

  First, the temporary lid 20 in which each of the plurality of simulated heat sources 30 is connected by the connecting mechanism 40 is prepared.

  Subsequently, the temporary lid 20 is moved above the container body. At this time, each of the plurality of simulated heat sources 30 is suspended from the temporary lid 20 by the action of gravity. Specifically, the second hooking portion 44 provided on the support plate 31 of the simulated heat source 30 is hooked on the first hooking portion 42 provided on the lower surface of the temporary lid 20 by the action of gravity. At this time, the second hook 42 is in contact with the portion of the first hook 42 that is closest to the simulated heat source 30.

  Further, when each of the plurality of simulated heat sources 30 is suspended from the temporary lid 20, the temperature measuring device 50 is also suspended from the temporary lid 20.

  Subsequently, the temporary lid 20 is aligned so that each of the plurality of simulated heat sources 30 is positioned directly above the corresponding storage space 66 among the plurality of storage spaces 66. Thereafter, the temporary lid 20 is lowered toward the container body. Thereby, each of the plurality of simulated heat sources 30 is simultaneously inserted into the corresponding accommodation space 66.

  Each of the plurality of simulated heat sources 30 descends in the corresponding accommodation space 66. Here, before the temporary lid 20 comes into contact with the container body, the lower ends of the simulated heat sources 30 (that is, the lower surfaces of the support plates 33 of the simulated heat sources 30) are the bottom surfaces 18 of the container body (FIG. 1). Contact). Therefore, only the temporary lid 20 continues to descend toward the container body. At this time, the first hooking portion 42 provided on the temporary lid 20 moves downward with respect to the second hooking portion 44 provided on the simulated heat source 30, whereby the second hooking portion 44 is moved to the first hooking portion. The state in which the movement of the second hooking portion 44 is restrained by the first hooking portion 42 is released because the contact with the second hooking portion 44 is lost. In other words, the second hooking portion 44 is not caught by the first hooking portion 42. As a result, the simulated heat source 30 can move in any direction within the accommodation space 66.

  In this state, the temporary lid 20 is attached to the container body. When the temporary lid 20 is attached to the container body, for example, a bolt is used.

  With the temporary lid 20 attached to the container body, the inside of the container body is maintained in a reduced pressure state. Helium gas is sealed in the container body.

  As described above, when the temporary lid 20 is attached to the container body, the temperature measuring device 50 is inserted into any of the plurality of accommodating spaces 66 with each of the pair of holding plates 55 held in the retracted position. Therefore, the pair of presser plates 55 are accommodated in the accommodation space 66 without contacting the basket 60.

  With the temporary lid 20 attached to the container body, the operation handle 581 is operated in the second direction, so that the tensile force by the wire 571 is released. At this time, the pressing plate 55 moves in a direction away from the frame 532 by the urging force of the spring 56 and comes into contact with the inner surface of the basket 60 (the side surface defining the accommodation space 66). As a result, the terminal portion 551 of the thermocouple 51 attached to the presser plate 55 contacts the inner surface of the basket 60.

  After making such preparations, a heat transfer test is performed. In the heat transfer test, each of the plurality of simulated heat sources 30 is heated by passing a current through the heater wire 34 included in each of the plurality of simulated heat sources 30. Thereby, the calorific value and the heat generation area of the spent fuel are simulated.

  In this state, the surface temperature of the basket 60 and the surface temperature of the container main body are measured, and it is confirmed that the temperature obtained by the analysis at the time of design does not exceed.

  The heat transfer test is performed in a state in which the container body is placed vertically (that is, the state in which the accommodation space 66 extends in the vertical direction) and in a state in which it is placed horizontally (that is, a state in which the accommodation space 66 extends in the lateral direction). . Here, in a state where the container main body is placed vertically, each of the plurality of simulated heat sources 30 is in contact with the bottom surface 18 of the container main body. On the other hand, when the container body is in the horizontal position, each of the plurality of simulated heat sources 30 is in contact with the inner surface of the basket 60. This is because the movement of each of the plurality of simulated heat sources 30 is not restricted in the accommodation space 66. By doing so, the movement of the spent fuel in the accommodation space 66 can be simulated.

  When such a heat transfer test is completed, the heat transfer test apparatus 10 is removed from the container body. The work will be described below.

  First, by operating the operation handle 581 in the first direction, a tensile force is applied to the wire 571 to move the presser plate 55 in a direction approaching the frame 532 against the biasing force of the spring 56. As a result, the presser plate 55 is separated from the inner surface of the basket 60. That is, the terminal portion 511 included in the thermocouple 51 is separated from the inner surface of the basket 60.

  After such a state, the state where the temporary lid 20 is attached to the container body is released, and the temporary lid 20 is lifted upward from the container body. At the initial stage, since the second hooking portion 44 is not hooked to the first hooking portion 42, only the temporary lid 20 moves upward, but the second hooking portion 44 is moved to the first hooking portion 42 from the middle. As a result, each of the plurality of simulated heat sources 30 is suspended from the temporary lid 20, and each of the plurality of simulated heat sources 30 also moves upward as the temporary lid 20 moves upward. As a result, each of the plurality of simulated heat sources 30 is extracted from the corresponding accommodation space 66. In this way, the heat transfer test device 10 is removed from the container body.

  In the heat transfer test apparatus 10, since the plurality of simulated heat sources 30 can be handled together when attaching the temporary lid 20 to the container body, each of the plurality of simulated heat sources 30 is simultaneously accommodated in the corresponding accommodating space 66. Can be inserted. As a result, the time required for the operation of inserting the simulated heat source 30 into each of the plurality of storage spaces 66 can be shortened as compared to the case where the simulated heat source 30 is inserted into each of the plurality of storage spaces 66 separately. Therefore, in the heat transfer test apparatus 10, the time required for preparation of the heat transfer test can be shortened and the heat transfer test can be performed efficiently.

  Further, in the heat transfer test apparatus 10, each of the plurality of simulated heat sources 30 can move in an arbitrary direction within the storage space 66, so that the movement of the spent fuel stored in each of the plurality of storage spaces 66 can be measured. Can be simulated. Therefore, the heat transfer test can be performed under conditions close to the situation where the cask is actually used.

  In the heat transfer test apparatus 10, each of the plurality of heater wires 34 included in the simulated heat source 30 includes a plurality of heat generation regions 341 having different heat generation amounts, so that not only the heat generation amount of the spent fuel but also the spent fuel is used. The axial heat generation region can also be simulated. Therefore, a more accurate heat transfer test can be performed.

  In the heat transfer test apparatus 10, as the coupling mechanism 40, a first hooking portion 42 provided on the temporary lid 20 and a second hooking portion provided on the simulated heat source 30 and hooked on the first hooking portion 42. 44, the second hooking portion 44 is automatically released from the first hooking portion 42 when each of the plurality of simulated heat sources 30 is housed in the corresponding housing space 66. Can be done. Therefore, even if there is no special operation from the outside, it is possible to realize a state in which the simulated heat source 30 can move in any direction within the accommodation space 66.

  In the heat transfer test apparatus 10, the second hooking portion 44 is hooked on the portion of the first hooking portion that is closest to the simulated heat source 30 due to the action of gravity, so that the second hooking portion 44 is hooked on the first hooking portion 42. The position can be limited to a specific position. Therefore, when each of the plurality of simulated heat sources 30 is suspended from the temporary lid 20, it is possible to suppress variations in posture when suspended between the plurality of simulated heat sources 30.

  In the heat transfer test apparatus 10, the second hooking portion 44 is prevented from falling off from the first hooking portion 42, so that the second hooking portion 44 is hooked again from a state where it is not hooked to the first hooking portion 42. It is possible to reliably shift to the state. Therefore, for example, when the heat transfer test is completed and the temporary lid 20 is removed, the operation of simultaneously pulling out each of the plurality of simulated heat sources 30 from the corresponding accommodation space 66 can be stably performed.

  As mentioned above, although embodiment of this invention was explained in full detail, these are illustrations to the last, Comprising: This invention is not interpreted restrictively at all by description of the above-mentioned embodiment.

  For example, in the above embodiment, a permanent magnet is provided on the upper end of the simulated heat source 30, while an electromagnet is provided on the lower surface of the temporary lid 20, and the movement of the simulated heat source 30 is restricted by the attraction of the permanent magnet by the electromagnet. You may make it accept | permit the movement in the accommodation space 66 of the simulation heat source 30 by canceling | releasing attraction | suction of a magnet. In this case, when removing the temporary lid 20 from the container body, the simulated heat source 30 may not move with the temporary lid 20. In other words, the heat transfer test apparatus of the present invention only needs to be able to simultaneously insert each of the plurality of simulated heat sources into the corresponding accommodation space, and simultaneously pulls out each of the plurality of simulated heat sources from the accommodation space. You may not be able to.

  For example, in the above-described embodiment, one of the first hook portion 42 and the second hook portion 44 may be detachable from the other. Such a configuration is realized, for example, by a configuration capable of dividing one intermediate portion of the first hook portion 42 and the second hook portion 44.

  For example, in the above embodiment, only one temperature measuring device 50 is used, but a plurality of temperature measuring devices 50 may be used.

  For example, in the above embodiment, the temperature measuring device 50 may not be provided.

  For example, in the above embodiment, the terminal portion 511 of the thermocouple 51 is located in the hole 551 formed in the presser plate 55 that supports the thermocouple 51, and the presser plate 55 contacts the inner surface of the basket 60. In this state, the terminal portion 511 is in contact with the inner surface of the basket 60 together with the holding plate 55, but a contact plate embedded with the terminal portion 511 included in the thermocouple 51 is adopted instead of the holding plate 55, and the terminal portion of the thermocouple 51 is used. 511 may allow heat conduction from the inner surface of the basket 60 through a contact plate in contact with the inner surface of the basket 60.

DESCRIPTION OF SYMBOLS 10 Heat transfer test apparatus 20 Temporary lid 30 Simulated heat source 32 Heat regulation plate 34 Heater wire 40 Connection mechanism 42 1st hook part 44 2nd hook part

Claims (6)

Used to transport and / or store the spent fuel in a state in which the spent fuel is accommodated in each of a plurality of accommodation spaces defined by a grid-like basket and extending in a predetermined direction in parallel with each other; An opening for inserting the basket from the outside is formed to confirm the heat removal function of the container including a container body that accommodates the basket and a container lid that is attached to the container body so as to cover the opening of the container body A heat transfer test device used for a heat transfer test for
Instead of the container lid, a temporary lid that can be attached to the container body;
A plurality of simulated heat sources arranged so as to be accommodated in each of the plurality of accommodation spaces, each simulating a calorific value of the spent fuel;
A plurality of connection mechanisms that individually connect each of the plurality of simulated heat sources to the temporary lid;
The plurality of coupling mechanisms are:
When the temporary lid is lowered toward the container body from above the container body in a state where each of the plurality of storage spaces is open upward, each of the plurality of simulated heat sources is applied to the temporary cover. Restraining movement in a direction away from at least the temporary lid among the movements of each of the plurality of simulated heat sources so as to maintain the suspended state against the
In a state where each of the plurality of simulated heat sources is housed in the corresponding housing space and the temporary lid is attached to the container body, the lower ends of the plurality of simulated heat sources are in contact with the bottom surface of the container body. Then, the heat transfer test device that releases the state in which each of the plurality of simulated heat sources is suspended from the temporary lid. The heat transfer test device according to claim 1,
Each of the plurality of simulated heat sources is
Each including a plurality of heater wires arranged to extend in the predetermined direction;
Each of the plurality of heater wires has a plurality of heat generation regions that are formed side by side in the predetermined direction so as to simulate the heat generation region of the spent fuel, and have different heat generation amounts. The heat transfer test device according to claim 1,
Each of the plurality of simulated heat sources is
Including a plurality of heat regulation plates arranged apart in the predetermined direction;
The plurality of heat regulation plates are heat transfer test devices that divide the corresponding accommodation spaces into a plurality of heat generation spaces so as to simulate the shape of the spent fuel and suppress heat convection. The heat transfer test apparatus according to any one of claims 1 to 3,
Each of the plurality of coupling mechanisms is
A first hook provided on the temporary lid;
A second hooking portion provided in the simulated heat source and capable of being hooked to the first hooking portion;
When the temporary lid is lowered toward the container body from above the container body in a state where each of the plurality of storage spaces is open upward, the second hooking portion is moved by the action of gravity. A state in which each of the plurality of simulated heat sources is suspended from the temporary lid by being hooked on one hook portion is realized.
When only the temporary lid further descends toward the container body with each of the plurality of simulated heat sources in contact with the bottom surface of the container body in the corresponding accommodating space, the first hooking portion is 2. A heat transfer test device that realizes a state in which each of the plurality of simulated heat sources can move in an arbitrary direction within the corresponding accommodation space by separating from the two hooking portions. The heat transfer test device according to claim 4,
The first hook portion serves as a simulated heat source when the temporary lid is lowered toward the container body from above the container body in a state where each of the plurality of storage spaces is open upward. Including a guide portion curved or bent so as to protrude toward the
The second hooking portion is a heat transfer test apparatus that is hooked on a portion of the guide portion that is closest to the simulated heat source by the action of gravity. The heat transfer test device according to claim 4 or 5,
The first hook portion is formed with an annular hook portion together with the temporary lid by attaching both ends thereof to the temporary lid.
The second hooking portion is attached to the simulated heat source with both ends thereof attached to the simulated heat source in a state in which an intermediate portion thereof passes through the annular hooking portion so as to prevent the second hooking portion from falling off the first hooking portion. Thermal test equipment.

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