JP6132356B2 - Fuel holder, method of using fuel holder, and method of transporting fuel assembly - Google Patents

Description

  The present invention relates to a fuel holder, a method for using the fuel holder, and a method for transporting the fuel assembly. More specifically, the present invention accommodates any fuel assembly of fuel assemblies formed according to different standards without rattling. Fuel holder, method of using the fuel holder, and method of transporting the fuel assembly, in particular, a fuel holder capable of accommodating the fuel assembly used in a boiling water reactor, method of using the fuel holder, and fuel The present invention relates to a method for transporting aggregates.

  Patent Document 1 states that “in a fuel transport container in which a mixed oxide fuel body is housed in a fuel protective container having a quadrangular cross section and transported in a basket of the fuel transport container, the fuel transport container is leveled. Each side of the cross section of each basket hole is inclined at about 45 degrees from the horizontal, and each fuel protection container is supported by its own weight with a V-shaped basket hole wall, and between the upper two outer surfaces and the basket hole wall. There is described a “mixed oxide fuel transport container” provided with a lashing device for restraining the movement of the fuel protection container in the basket hole (see claim 1 of Patent Document 1).

  Patent Document 2 states that “in a transportation method of storing a boiling water reactor fuel body in a vertically long inner container or the like and transporting it with a transportation container, the fuel body and the inner container or the like when the transportation container is leveled. The boiling water atom is characterized in that one side of the vertical cross section of the liquid crystal is inclined at approximately 45 degrees from the horizontal, and the fuel body is fastened to the inner container by fastening the fuel body from above. A method for transporting a reactor fuel body ”is described (see claim 1 of Patent Document 2).

  Patent Document 3 states that “in a fuel protection container that directly stores a fuel body for transporting a mixed oxide fuel body for a boiling water reactor, the thickness between the inner wall of the fuel protection container and the fuel body main body is 2 mm or more. A protective body made of a rubber-based material within a range of 4 mm or less is installed, the amount of elongation in the thickness direction due to the temperature change of the protective body, and the elongation due to the temperature change between the fuel protective container and the fuel body main body. A fuel protection vessel for mixed oxide fuel bodies for boiling water reactors, characterized in that the difference is set to the same extent. "(See claim 5 of Patent Document 3) and" mixed oxidation for boiling water reactors " In a fuel protective container for directly storing a fuel body for transportation of a physical fuel body, a protective body made of a phenol resin material having a thickness of 7 mm or more and 11 mm or less is provided between the inner wall of the fuel protection container and the fuel body main body. It is characterized by having installed Fuel protective container Agamizu reactor for mixed oxide fuel assembly. "(Claim 6 See Patent Document 3.) Have been described.

  In Patent Document 4, “a rectangular tube-shaped fuel protective container that can be transported by being accommodated in a basket hole of a fuel transport container is provided, and the fuel protective container includes an upper tie plate and a lower type of a fuel body housed therein. Reactor fuel fuel protection device comprising a tie plate clamping mechanism at a position corresponding to a rate, the tie plate clamping mechanism having a clamping tool that can be moved forward and backward toward a stored fuel body (See claim 10 of Patent Document 4).

Japanese Patent No. 3080894 Japanese Patent No. 3142493 Japanese Patent No. 3080897 Japanese Patent No. 3080895

  By the way, a fuel assembly used in a light water reactor such as a boiling water reactor and a pressurized water reactor is accommodated in a fuel holder, and the fuel holder is further loaded in a transport container and transported to a demand place. There are several types of standards for fuel assemblies currently being developed for each boiling water reactor and pressurized water reactor. A fuel assembly formed according to a certain standard is different from an outer dimension of a fuel assembly formed according to another standard. Various dimensions of the fuel holder as described above are determined in accordance with a fuel assembly of a specific standard. Therefore, a specific fuel holder designed to be able to accommodate a fuel assembly formed in accordance with a specific standard without rattling may cause rattling when a fuel assembly of another standard is accommodated. Therefore, in a normal case, a fuel holder that accommodates a fuel assembly formed in accordance with a certain standard is strictly designed according to the dimensions of the fuel assembly. Therefore, a fuel assembly according to another standard is placed in the fuel holder. There is no idea of housing, and in reality, fuel holders having various dimensions are prepared for each fuel assembly standard so as to be adapted only to the fuel assembly.

  Therefore, when a fuel assembly conforming to a certain standard is accommodated in a fuel holder suitable for the fuel assembly, the fuel holder accommodating a fuel assembly conforming to another standard is not used and is in an idle state. The idle fuel holder causes problems such as requiring a storage place.

  The problem to be solved by the present invention is that a fuel assembly formed according to a certain standard and a fuel assembly formed according to another standard can accommodate both of these plural types of fuel assemblies. A fuel holder that is compatible with each other and that can accommodate the fuel assembly without backlash, a method of using the fuel holder, and transportation of the fuel assembly using the fuel holder to transport the fuel assembly Is to provide a method. Further, regarding the fuel holder, the problem to be solved by the present invention is that any fuel assembly of different standards can be accommodated and shared with any fuel assembly. Providing a possible fuel holder.

Means for solving the problems are as follows:
(1) A fuel holder comprising a housing shell, a backing plate, and an urging means,
The housing shell has four inner wall surfaces orthogonal to each other that form a housing space capable of housing any fuel assembly of different standards.
The receiving plate is provided on each of the adjacent inner wall surfaces among the four inner wall surfaces,
The biasing means is provided on each of the two inner wall surfaces not provided with the backing plate, and has a biasing force toward the other inner wall surfaces facing each of the two inner wall surfaces,
The receiving plate and the urging means have a size capable of abutting against the outer peripheral surface of the upper tie plate grid regardless of the standard of the fuel assembly, and can fix the grid. The fuel holder is a feature.

Means for solving the other problems are as follows:
(2) A method of using a fuel holder, wherein the fuel assembly is accommodated in the fuel holder according to (1).

Means for solving the still another problem is as follows.
(3) A method for transporting a fuel assembly, wherein the fuel assembly is accommodated in the fuel holder according to (1) and transported.

The fuel holder according to the present invention can be used as a common holder that can accommodate any of various fuel assemblies formed according to different standards.
The fuel holder according to the present invention has a size such that the backing plate and the urging means can contact the outer peripheral surface of the grid of the upper tie plate, regardless of the fuel assembly formed according to any standard. Since the grid can be fixed, even a fuel assembly formed according to any standard can be accommodated without rattling.

  The method of using the fuel holder according to the present invention is such that the fixing plate and the urging means can be brought into contact with the outer peripheral surface of the grid of the upper tie plate even if the fuel assembly is formed according to any standard. Since the grid can be fixed, even a fuel assembly formed according to any standard can be accommodated without rattling. Therefore, it is not necessary to manufacture a fuel holder for each fuel assembly having a different standard. Further, when the fuel assembly is accommodated in the fuel holder, there is no complicated work of selecting the fuel holder according to the fuel assembly having different standards. In addition, since one type of fuel holder can be used for any fuel assembly formed in accordance with any standard, the inspection method and management method of the fuel holder are uniform, and maintenance is not complicated. .

  The fuel assembly transportation method according to the present invention accommodates and transports the fuel assembly in a fuel holder that can be accommodated without rattling even if the fuel assembly is formed according to any standard. There is no complicated operation of selecting a fuel holder in accordance with different fuel assemblies. Further, for example, ten fuel holders A that can accommodate only fuel assemblies manufactured according to a standard X as in the prior art are prepared, and only fuel assemblies Y manufactured according to another standard can be stored. When 10 fuel holders B are prepared, there is no problem when 10 fuel assemblies X are transported to the demand area P and 10 fuel assemblies Y are transported to the demand area R. When it is necessary to deliver 10 pieces to each demand place P, R, if 10 fuel assemblies X are accommodated in the fuel holder A and delivered to one demand place P, the other demand place R Since there is not enough fuel holder A to accommodate the fuel assembly X to be delivered to the vehicle, the delivery of the fuel assembly X to one demand point P is completed and the loading place of the fuel assembly A (MOX fuel factory Fuel holder A returns to Up, we had to wait for the fuel assemblies A to be delivered to the other of the demand area R. However, the fuel assembly transportation method according to the present invention can accommodate a fuel assembly manufactured according to any of the X and Y standards in the fuel holder. Since the fuel holder can be shared, all the fuel assemblies X to be delivered can be loaded at the loading place regardless of the standard. As a result, the fuel holder A that accommodates the fuel assembly X delivered to the demand area P is sufficient, but the fuel holder A that accommodates the fuel assembly X delivered to the demand area R may be insufficient. In addition, it is possible to reduce the waiting time while waiting for the shipment of the fuel assemblies A at the loading place.

FIG. 1 is a schematic sectional view showing an embodiment of a fuel holder according to the present invention. FIG. 2 is a schematic cross-sectional explanatory view obtained by cutting the fuel holder and the fuel assembly shown in FIG. 1 at a cut surface that is orthogonal to the longitudinal direction of the fuel assembly and passes through the grid of the upper tie plate. FIG. 3A is a schematic cross-sectional view of a main part showing the vicinity of an upper tie plate in a state where a fuel assembly of 8 × 8 fuel is loaded on a conventional fuel holder. FIG. 3B is a schematic cross-sectional view of a main part showing the vicinity of the upper tie plate in a state where a fuel assembly of 9 × 9 fuel is loaded on a conventional fuel holder. FIG. 4 (a) is a schematic cross-sectional explanatory view of an essential part showing the vicinity of an upper tie plate in a state where a fuel assembly which is 8 × 8 fuel is loaded on a fuel holder which is an embodiment of a fuel holder according to the present invention. is there. FIG. 4B is a schematic cross-sectional view of the main part showing the vicinity of the upper tie plate in a state where a fuel assembly which is 9 × 9 fuel is loaded on the fuel holder which is an embodiment of the fuel holder according to the present invention. is there.

  Hereinafter, a fuel holder according to the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic cross-sectional view showing one embodiment of a fuel holder according to the present invention. FIG. 2 is a schematic cross-sectional explanatory view obtained by cutting the fuel holder and the fuel assembly shown in FIG. 1 at a cut surface that is orthogonal to the longitudinal direction of the fuel assembly and passes through the grid of the upper tie plate.

  As shown in FIGS. 1 and 2, the fuel holder 1 includes a housing shell 2 that extends in the direction of the axis O, a receiving plate 3, and an urging means 4. In addition, the fuel holder 1 accommodates the fuel assembly 100 and includes a fixing plate 5, a cushioning material 7, a base 8, a top portion 9, and a bottom portion 10 that are members necessary for fixing and transporting the fuel assembly 100. I have. The fuel holder 1 is an embodiment of the fuel holder according to the present invention.

  The fuel assembly 100 accommodated in the fuel holder 1 is, for example, a fuel assembly used in a boiling water reactor, and a plurality of fuel rods 104 and water pipes (not shown) include an upper tie plate 101 and a plurality of fuel assemblies. The support lattice 102 and the lower tie plate 103 are bundled together.

  The upper tie plate 101 has a grid 105 and a handle 106. The grid 105 is a substantially rectangular plate-like body and has a plurality of through holes. A plurality of fuel rods 104 and water pipes are fitted into the through holes, and the upper tie plate 101, the fuel rods 104, and the water pipes are fixed. The handle 106 serves as a held portion when the fuel assembly 100 is moved in a vertical state. The handle 106 has a U-shape and is coupled to the grid 105 at a diagonal position of the grid 105 that is substantially square in plan view.

  The lower tie plate 103 includes a lower grid 107, a hollow pyramid-shaped inverted pyramid portion 108 that decreases in width from the end of the lower grid 107 toward the cylindrical portion 109, and a nosepiece portion (see FIG. Not shown). The lower grid 107 is a substantially rectangular plate-like body and has a plurality of through holes. A plurality of fuel rods 104 and water pipes are fitted into the through holes, and the lower tie plate 103, the fuel rods 104, and the water pipes are fixed.

The fuel rod 104 is configured by enclosing a plurality of cylindrical fuel pellets in a long metal cladding tube. The fuel pellet is formed of, for example, a MOX fuel in which plutonium oxide (PuO ₂ ) and uranium oxide (UO ₂ ) are mixed.

  As the standard of the fuel assembly, for example, an appropriate standard can be adopted according to the type and size of the boiling water reactor, for example, 8 × 8 fuel, 9 × 9 fuel S lattice, C lattice , N lattice, and D lattice. The fuel assembly 100 used in the boiling water nuclear reactor may differ in outer dimensions of the fuel assembly 100 by, for example, several mm to several tens mm depending on the standard. In particular, the length in the longitudinal direction from the cylindrical portion 109 of the lower tie plate 103 to the grid 105 of the upper tie plate 101 differs depending on the standard of the fuel assembly 100.

  As shown in FIGS. 1 and 2, the housing shell 2 of the fuel holder 1 is a cylindrical body whose cross section perpendicular to the axis O direction of the housing shell 2 forms a square. The housing shell 2 has four inner wall surfaces 21, 22, 23, and 24 that are orthogonal to each other. The housing shell 2 forms a housing space S in which any fuel assembly of a plurality of fuel assemblies formed according to different standards can be housed. That is, the fuel holder 1 is designed to accommodate the largest fuel assembly among fuel assemblies formed according to different standards.

  As shown in FIG. 2, the four panel members that give the respective inner wall surfaces 21, 22, 23, and 24 may be fixed to each other and not fixed before the fuel assembly 100 is accommodated. May be. However, the housing shell 2 after housing the fuel assembly 100 is deformed so that the inner wall surfaces 21, 22, 23, and 24 are not orthogonal to each other due to an impact or the like acting on the housing shell 2 during transportation. It is preferable to provide an appropriate reinforcing material at an appropriate location on the inner wall surface so that there is no problem.

  As shown in FIG. 1, when the fuel assembly 100 is housed in the housing shell 2, the top portion 9 closes the opening on the upper tie plate 101 side of the housing shell 2, and the bottom portion 10 is the lower tie plate in the housing portion 2. The opening on the 103 side is closed. The top 9 and the bottom 10 are preferably fixed to the housing shell 2 respectively. The fixing means for the top portion 9 and the bottom portion 10 and the housing shell 2 is not particularly limited, and known means such as adhesion, welding, engagement, fitting, or screwing, or ordinary knowledge in the technical field of the present invention. Means that can be easily conceived by a person who has the job can be employed.

  In many cases, the housing of the fuel assembly 100 in the housing shell 2 is usually performed with the housing shell 2 and the fuel assembly 100 standing upright. The pedestal 8 attached to the inside of the bottom portion 10 can insert the nose piece portion of the lower tie plate 103 and support the cylindrical portion 109 of the fuel assembly 100 when the fuel assembly 100 is upright. Is formed.

  The shock-absorbing material 7 is dropped when the fuel holder is dropped when transporting the fuel holder to a transport container containing a plurality of fuel holders, or when the transport container is dropped when transporting the transport container to the destination. It is provided to absorb the impact of time.

  The inner wall surfaces 21, 22, 23 and 24 of the housing shell 2 are provided with fixing means such as a receiving plate 3, an urging means 4 and a fixing plate 5. The fixing plate 5 is provided at a position in contact with the outer peripheral surfaces of one or a plurality of support grids 102 and the lower grid 107 on the inner wall surfaces 21, 22, 23 and 24. The receiving plate 3 and the urging means 4 are provided at positions where the inner wall surfaces 21, 22, 23, and 24 are in contact with the outer peripheral surface of the grid 105 of the upper tie plate 101. The fuel assembly 100 is fixedly supported by the fuel holder 1 by these fixing means. As a result, when vibration during transportation propagates to the fuel assembly 100, the fuel rod 104 and the water pipe (not shown) positioned between the upper tie plate 101 and the lower tie plate 103 are inserted. It is possible to prevent the part being bent from being bent and causing mechanical damage.

  The fixing plate 5 of this embodiment is in contact with all the support lattices 102 and the lower tie plate 103 to support the fuel assembly 100 from four directions orthogonal to the longitudinal direction of the fuel assembly 100. The fixing plate 5 may be provided so as to abut on at least one of the plurality of support grids 102 as long as the fuel assembly 100 can be fixedly supported by the fuel holder 1. Further, it may be designed to support from two directions orthogonal to the longitudinal direction of the fuel assembly 100. The fixing plate 5 of this embodiment supports the lower tie plate 103 from four directions orthogonal to the longitudinal direction of the fuel assembly 100, but may be designed to support from two directions.

  The shape of the fixing plate 5 is not particularly limited as long as the support grid 102 and the lower tie plate 103 can be fixed. Examples of the shape of the fixed plate 5 include a rectangular plate shape and a circular plate shape. One of the fixed plates 5 of the inner wall surfaces 21 and 22 provided with the fixed plate 5 and the fixed plate 5 provided on the inner wall surfaces 23 and 24 opposed to the inner wall surfaces 21 and 22 is opposed to the opposed inner wall surfaces 23 and 24 or 21. And 22 may be formed by a biasing member having a biasing force toward 22. Examples of the urging member include a fastening member such as a screw, a leaf spring, an air spring, and a coil spring.

  As shown in FIG. 2, the receiving plate 3 is provided on each of two adjacent inner wall surfaces 21 and 22 among the four inner wall surfaces 21, 22, 23 and 24. The manner in which the receiving plate 3 is fixed to the inner wall surfaces 21 and 22 is such that the receiving plate 3 is not detached from the inner wall surfaces 21 and 22 due to impact or vibration propagating from the housing shell 2 to the receiving plate 3 when the fuel assembly 100 is transported. Any fixed manner may be used. As a manner of fixing the backing plate 3 to the inner wall surfaces 21 and 22, for example, an appropriate means such as engagement, adhesion or welding or a means that can be easily conceived by a person having ordinary knowledge in the technical field of the present invention is adopted. can do. The shape of the receiving plate 3 in this embodiment is a rectangular plate shape, but is not particularly limited as long as the upper tie plate 101 can be supported, and may be, for example, a polygonal plate shape, a circular plate shape, or the like. .

  Of the four inner wall surfaces 21, 22, 23, and 24, the urging means 4 is provided on each of the two adjacent inner wall surfaces 23 and 24 where the receiving plate 3 is not provided. The biasing means 4 has a biasing force toward the inner wall surfaces 23 and 24 facing the inner wall surfaces 23 and 24 provided with the biasing means 4, respectively. That is, the biasing means 4 provided on the inner wall surface 23 has a biasing force toward the inner wall surface 21, and the biasing means 4 provided on the inner wall surface 24 has a biasing force toward the inner wall surface 22. ing.

  The biasing means 4 is not particularly limited as long as it has a biasing force toward the inner wall surfaces 21 and 22 facing the inner wall surfaces 23 and 24 provided with the biasing means 4 and can fix the grid 105. . As the biasing means 4, for example, a plate spring, an air spring, a coil spring, and the like can be cited in addition to the screw tightening member shown in FIG. 2. The manner in which the biasing means 4 is fixed to the inner wall surfaces 23 and 24 is such that, when the fuel assembly 100 is transported, the biasing means 4 is moved by the impact or vibration transmitted from the housing shell 2 to the biasing means 4. Any fixing mode that does not leave the screen may be used. As a manner of fixing the urging means 4 to the inner wall surfaces 23 and 24, for example, appropriate means such as engagement, adhesion, or welding, or means that can be easily conceived by a person having ordinary knowledge in the technical field of the present invention. Can be adopted.

  By the way, the fuel assembly 100 is often loaded into the fuel holder 1 with the fuel holder 1 in an upright state with the bottom 10 thereof facing down. When the fuel assembly 100 is arranged so that the cylindrical portion 109 of the lower tie plate 103 contacts the pedestal 8 of the fuel holder 1, the fuel assembly 100 has a length in the longitudinal direction from the cylindrical portion 109 to the grid 105. The position of the grid 105 is different between a fuel assembly formed in accordance with a certain standard and a fuel assembly formed in accordance with another standard because it differs depending on the standard of the assembly.

  FIG. 3A is a schematic cross-sectional view of a main part showing the vicinity of an upper tie plate in a state where a fuel assembly of 8 × 8 fuel is loaded on a conventional fuel holder. FIG. 3B is a schematic cross-sectional view of a main part showing the vicinity of the upper tie plate in a state where a fuel assembly of 9 × 9 fuel is loaded on a conventional fuel holder.

  As shown in FIG. 3 (a), for example, the fuel assembly 100a that is 8 × 8 fuel has an upper tie plate from the cylindrical portion 109a of the lower tie plate 103a as compared to the fuel assembly 100b that is 9 × 9 fuel. The length in the longitudinal direction from the 101a to the grid 105a is short. Accordingly, when the fuel assembly 100a is loaded so that the cylindrical portion 109a of the lower tie plate 103a contacts the pedestal 10a of the fuel holder, the position of the 8 × 8 fuel grid 105a is greater than the position of the 9 × 9 fuel grid 105b. Is also placed at a lower position.

  Accordingly, the 9 × 9 fuel assembly 100b is loaded on the fuel holder 1a provided with the receiving plate 3a and the urging means 4b in accordance with the position where the grid 105a of the 8 × 8 fuel assembly 100a is disposed. Then, the receiving plate 3a and the urging means 4a abut against the surface of the fuel rod 104b instead of the grid 105b, and the grid 105b cannot be fixed. Therefore, conventionally, an 8 × 8 fuel assembly 100a dedicated to the 8 × 8 fuel assembly 100a, in which the receiving plate 3a and the urging means 4a are provided in accordance with the position where the grid 105a of the 8 × 8 fuel assembly 100a is disposed. The 9 × 9 fuel assembly 100b is provided exclusively with the receiving plate 3b and the urging means 4b according to the position where the fuel holder 1a and the grid 105b of the 9 × 9 fuel assembly 100b are arranged. The fuel holder 1b was prepared separately.

  On the other hand, as shown in FIG. 4, the receiving plate 3 and the biasing means 4 in the fuel holder 1 of this embodiment are, for example, fuel assemblies 100a (FIG. 4 (a)) and 9 × which are 8 × 8 fuel. The size of the fuel assemblies 100a and 100b of the fuel assemblies 100b (FIG. 4B) that are nine fuels can contact the outer peripheral surfaces of the grids 105a and 105b of the upper tie plates 101a and 101b. The grids 105a and 100b can be fixed.

  That is, the receiving plate 3 and the biasing means 4 in the fuel holder 1 have at least a length in the direction of the axis O that can contact the outer peripheral surface of the grid 105 of all the fuel assemblies 100 having different specifications, and have different specifications. The grids 105 of all the fuel assemblies 100 can be fixed by the receiving plate 3 and the urging means 4. Specifically, for any fuel assembly 100 with different standards, the receiving plate 3 and the biasing means 4 preferably have a length that makes contact with the entire outer surface of the grid 105 in the direction of the axis O. . It is preferable that the receiving plate 3 and the urging means 4 have a length in the direction of the axis O of 30 to 80 mm on the surface that contacts the respective grids 105.

  As shown in FIG. 2, the urging means 4 of this embodiment is formed by a tightening member using screws, and includes a pressing portion 41, a tightening portion 42, and a frame body 43. The presser portion 41 is a plate-like body, and its outer peripheral portion is fitted to the frame body 43. The frame body 43 is joined to the inner wall surfaces 23 and 24 so that the presser portion 41 does not fall off the inner wall surfaces 23 and 24. For example, as shown in FIG. 2, the frame body 43 has a substantially L-shaped cross section, and the pressing portion 41 is disposed in a space surrounded by the frame body 43. The tightening portion 42 is, for example, a cylindrical screw and is fitted into a screw hole 44 formed in the housing shell 2. The urging means 4 presses the grid 105 from the outer peripheral surface via the pressing portion 41 by, for example, turning the screw 42 and tightening, and the grid 105 is restrained by the urging means 4 and the receiving plate 3. Therefore, the length of the presser 41 in contact with the outer peripheral surface of the grid 105, that is, the presser 41 exposed from the frame 43, in the axis O direction is equal to the outer peripheral surface of the grid 105 of all the fuel assemblies 100 having different standards. It is preferable to have at least a contactable length, and it is particularly preferable to have at least a length capable of contacting the entire outer peripheral surface of the grid 105 of all fuel assemblies 100 having different standards. The tightening portion 42 only needs to have a size capable of pressing the grids 105 of all the fuel assemblies 100 having different standards from the outer peripheral surface via the presser portion 41. For example, the tightening portion 42 preferably has a diameter of 10 to 30 mm. .

  The material constituting the fuel holder 1 such as the housing shell 2, the top portion 9, the bottom portion 10, the buffer material 7, the base 8, the receiving plate 3, the urging means 4, and the fixing plate 5 is used when the fuel assembly 100 is accommodated. To the time when the fuel assembly 100 is transported, and any material that satisfies the required mechanical strength, subcriticality, etc., is not particularly limited. For example, stainless steel, boron-containing stainless steel, and heat resistance A nickel-based alloy or the like can be employed.

The fuel holder 1 of this embodiment can be used as a common holder that can accommodate any of various fuel assemblies 100 formed according to different standards.
In the fuel holder 1 of this embodiment, the receiving plate 3 and the biasing means 4 can contact the outer peripheral surface of the grid 105 of the upper tie plate 101 even if the fuel assembly 100 is formed according to any standard. Since it has a size and the grid 105 can be fixed, even the fuel assembly 100 formed according to any standard can be accommodated without rattling.

  The fuel holder according to the present invention is not particularly limited to the fuel holder 1 of the embodiment shown in FIG. 4 and can be appropriately changed as long as the problems of the present invention can be solved.

  Next, an example of a method for using the fuel holder 1 and a method for transporting the fuel assembly 5 will be described.

Assume that a fuel assembly formed according to a certain standard is accommodated in the fuel holder 1.
First, the tightening portion 42 in the urging means 4 is loosened. Next, the fuel holder 1 is placed vertically so that its axis O direction is the vertical direction, one panel member of the housing shell 2 is opened, and the fuel assembly 100 is placed in the housing space S of the fuel holder 1. Deploy. At this time, the nose piece portion is inserted into the pedestal 8 so that the cylindrical portion 109 contacts the pedestal 8.

  The housing shell 2 after the fuel assembly 100 is disposed on the fuel holder 1 needs to have a fixed state in which the four panel members are orthogonal to each other, but the housing shell 2 before the fuel assembly 100 is disposed is Each panel board may be mutually fixed and does not need to be fixed. That is, in the housing shell 2 before the fuel assembly 100 is disposed, for example, each panel member is separated from each other, two adjacent panel members and the other two panel members are fixed, respectively. The aspect may be any of the aspect in which the three panel members are fixed and only one panel member is separated, and the aspect in which the four panel members are fixed so as to be orthogonal to each other. Moreover, the fixed aspect of panel members may be integrally formed by combining the entire lengths of adjacent end edges, or a plurality of specific locations at adjacent end edges may be combined with each other.

  The bottom 10 before the fuel assembly 100 is arranged may be fixed to all four panel members or may not be fixed to all four panel members, or may be fixed to some panel members. Good. After the fuel assembly 100 is disposed in the fuel holder 1, the bottom portion 10 and all the panel members are fixed by known means such as welding or engagement. The top portion 9 is also fixed to the panel member in the same manner as the bottom portion 10.

  Next, the tightening portion 42 in the urging means 4 is tightened so that the pressing portion 41 and the receiving plate 3 are brought into contact with the side surface of the grid 105, that is, the outer peripheral surface, and the grid 105 is fixed with an appropriate pressing force.

  The fuel holder 1 in which the fuel assembly 100 is accommodated is further loaded in a transport container, and is transported to a demand place such as a nuclear power plant and other fuel facilities by transport means such as a trailer or a ship. The number of fuel holders 1 loaded in one transport container varies depending on the type of transport container, for example, four, nine, twelve, etc., and the fuel holder 1 is conveyed by a conventionally known transport container. The

  According to the method of using the fuel holder 1, even if the position of the upper tie plate 101 in the axis O direction of the grid 105 of the upper tie plate 101 changes according to the standard of the fuel assembly 100, the receiving plate 3 and the urging means 4 are placed on the outer peripheral surface of the grid 105. Since the grid 105 has a size that can be abutted and can be fixed, the fuel assembly 100 formed in accordance with any standard can be accommodated without looseness, and the fuel assemblies with different standards can be accommodated. There is no need to manufacture a fuel holder for each body. Further, there is no complicated operation of selecting a fuel holder for each fuel assembly having different standards. In addition, since one type of fuel holder can be used for any fuel assembly formed in accordance with any standard, the inspection method and management method of the fuel holder are uniform, and maintenance is not complicated. .

  According to this method for transporting the fuel assembly 100, the fuel assembly 100 is accommodated and transported in the fuel holder 1 that can be accommodated without rattling even if the fuel assembly 100 is formed according to any standard. There is no complicated operation of selecting a fuel holder for each fuel assembly 100 having different standards. Further, for example, ten fuel holders A that can accommodate only fuel assemblies manufactured according to a standard X as in the prior art are prepared, and only fuel assemblies Y manufactured according to another standard can be stored. When 10 fuel holders B are prepared, there is no problem when 10 fuel assemblies X are transported to the demand area P and 10 fuel assemblies Y are transported to the demand area R. When it is necessary to deliver 10 pieces to each demand place P, R, if 10 fuel assemblies X are accommodated in the fuel holder A and delivered to one demand place P, the other demand place R Since there is not enough fuel holder A to accommodate the fuel assembly X to be delivered to the vehicle, the delivery of the fuel assembly X to one demand point P is completed and the loading place of the fuel assembly A (MOX fuel factory Fuel holder A returns to Up, we had to wait for the fuel assemblies A to be delivered to the other of the demand area R. However, the fuel assembly transportation method according to the present invention can accommodate a fuel assembly manufactured according to any of the X and Y standards in the fuel holder. Since the fuel holder can be shared, all the fuel assemblies X to be delivered can be loaded at the loading place regardless of the standard. As a result, the fuel holder A that accommodates the fuel assembly X delivered to the demand area P is sufficient, but the fuel holder A that accommodates the fuel assembly X delivered to the demand area R may be insufficient. In addition, it is possible to reduce the waiting time while waiting for the shipment of the fuel assemblies A at the loading place.

DESCRIPTION OF SYMBOLS 1 Fuel holder 2 Housing shell 3 Base plate 4 Energizing means 5 Fixing plate 7 Buffer material 8 Base 9 Top part 10 Bottom part 21, 22, 23, 24 Inner wall surface 41 Holding part 42 Fastening part, Screw 43 Frame body 44 Screw hole 100 Fuel Assembly 101 Upper tie plate 102 Support grid 103 Lower tie plate 104 Fuel rod 105 Grid 106 Handle 107 Lower grid 108 Inverted pyramid portion 109 Cylindrical portion

Claims (3)

A fuel holder comprising a housing shell, a backing plate, and an urging means,
The housing shell has four inner wall surfaces that are orthogonal to each other and form a housing space that can accommodate any fuel assemblies having different longitudinal lengths from the lower tie plate to the upper tie plate. And
The receiving plate is provided on each of the adjacent inner wall surfaces among the four inner wall surfaces,
Said biasing means Rutotomoni provided in each of two inner wall surfaces of the receiving plate is not provided, and a clamping portion which have a biasing force toward the other inner wall surfaces opposed, a substantially L-shaped cross section A frame having a shape, and a presser part disposed in a space formed by the frame and the inner wall surface,
By urging the tightening portion toward the opposite inner wall surface, the holding portion is brought into contact with the outer peripheral surface of the grid of the upper tie plate, and the grid is fixed by the receiving plate and the holding portion. That is possible,
The fuel holder, wherein the holding portion exposed from the receiving plate and the frame has a length in the longitudinal direction of 30 mm to 80 mm .   The fuel holder is housed in the fuel holder according to claim 1, wherein the fuel holder is used.   A method for transporting a fuel assembly, comprising transporting the fuel assembly in a fuel holder according to claim 1.

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