JP2008267902A - Radioactive material storage facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radioactive material storage facility capable of improving the earthquake-proof performance of the storage building. <P>SOLUTION: The radioactive material storage facility 1 includes a storage building 2 containing a storage area 3. The storage building 2 has air supply-side side walls 4 and 6. Air supply openings 5 and 7 to take in cooling air are respectively formed on the air supply-side side walls 4 and 6. A supporting wall 12 working as a partitioning wall to define the storage area 3 and a supporting wall 15 as another partitioning wall are provided. Pressure-equalizing chambers 19 and 20 are formed between the supporting wall 12 and the air supply-side side wall 4 and between the supporting wall 15 and the air supply-side side wall 6. The air supply-side side wall 4 exists continuously between one end of the air supply-side side wall 4 and one end of the air supply opening 5 and between the other end of the air supply-side side wall 4 and the other end of the air supply opening 5. This can increase an earthquake load that the air supply-side side wall 4 can stand against earthquake motion in parallel to the air supply-side side wall 4 when an earthquake occurs. Consequently, the quake-proof performance of the storage building 2 increases. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radioactive material storage facility, and more particularly, to a radioactive material storage facility suitable for application to a radioactive material storage facility that stores a radioactive material storage container (for example, a metal cask) that stores spent fuel assemblies. .

  In a nuclear power plant, a fuel assembly loaded in a nuclear reactor is sequentially replaced with a new fuel assembly according to the age of use. Spent fuel assemblies removed from the reactor are generally stored and cooled in the storage pool water provided within the reactor power plant to release the radiation and heat resulting from the decay of the fission material. .

  Since the number of spent fuel assemblies stored in the storage pool has increased, a dry-type radioactive material storage facility has been constructed, and spent fuel assemblies stored in the storage pool in the nuclear power plant It is considered to transfer to a radioactive substance storage facility (see Patent Documents 1 and 2).

  Patent Documents 1 and 2 describe radioactive material storage facilities described below. The radioactive material storage facility having a storage building is a compartmented storage area in which a large number of radioactive material storage containers for storing a plurality of spent fuel assemblies are arranged, cooling supplying cooling air from the external environment into the storage area An air supply flow path and a cooling air discharge flow path for discharging cooling air from the storage area to the external environment are provided. A storage area, a cooling air supply channel, and a stored cooling air discharge channel are provided in the storage building. An exhaust tower provided on the roof of the storage building is connected to the cooling air discharge passage. An air supply port for taking in cooling air is formed on one side wall of the storage building on the side wall opposite to the exhaust tower, and communicates with the cooling air supply flow path. A partition is arranged between each storage area.

  In particular, in Patent Document 1, a carry-in / out passage is formed in a radioactive substance storage container between a side wall in which a plurality of air supply ports are formed and a storage area, and a partition wall is disposed between the storage areas. An air inlet is provided for each storage area. An air supply side wall is provided between the storage area and the loading / unloading passage between the storage area and the loading / unloading passage.

JP 2004-045230 A JP 2006-292694 A

  In the dry type radioactive material storage facility, in order to uniformly supply cooling air to each storage area in which the radioactive material storage container is arranged, an air supply port is formed for each storage area on the side wall of the storage building. Since the plurality of air supply openings are formed on the side wall (see Patent Documents 1 and 2), the seismic load that can be handled with respect to the earthquake motion parallel to the side wall is small. For this reason, it is desired to increase the seismic load that can be handled by the supply side wall.

  The objective of this invention is providing the radioactive substance storage facility which can improve the earthquake resistance of a storage building.

  A feature of the present invention that achieves the above-described object is that a storage building having a storage area for storing a radioactive substance storage container is disposed in a direction crossing the pair of first side walls and the first side walls. A storage area is surrounded by the pair of first side walls and the pair of second side walls, and an air supply port for taking in outside air supplied to the storage area is at least one of the pair of first side walls. And at least a part of the air supply port is located in the center between both ends of the first side wall where the air supply port is formed, and the first side wall formed with the air supply port is one of the first side walls. 2 from the one end connected to the side wall to one end of the air supply port located in the central portion thereof, and from the other end connected to the other second side wall, the supply portion located in the central portion thereof. There is a continuous presence between the other end of the mouth.

  The first side wall in which the air supply port is formed is connected from one end connected to one second side wall to one end of the air supply port located in the center thereof and to the other second side wall. Between the other end of the air supply port and the other end of the air supply port located at the center of the second side wall of the first side wall formed with the air supply port. The length of the first side wall from the joined end to one end of the air supply port can be increased. For this reason, it is possible to increase the seismic load that the first side wall in which the air supply port is formed can handle the earthquake motion parallel to the first side wall at the time of the earthquake, and the earthquake resistance of the storage building is improved.

  ADVANTAGE OF THE INVENTION According to this invention, the earthquake resistance of the storage building of a radioactive substance storage facility can be improved.

  Examples of the present invention will be described below.

  A radioactive substance storage facility according to a preferred embodiment of the present invention will be described below with reference to FIGS. The radioactive substance storage facility 1 of the present embodiment includes a storage building 2 having a storage area 3 therein. The storage building 2 includes a pair of air supply side walls 4 and 6, a pair of side walls 8 </ b> A and 8 </ b> B, and a roof 9. The supply side walls 4 and 6 and the side walls 8A and 8B are outer walls of the storage building 2. The air supply side wall 4 and the air supply side wall 6 are arranged in parallel to each other, and the side walls 8A and 8B are arranged in parallel to each other and are orthogonal to the air supply side walls 4 and 6, respectively. The storage building 2 has a partition wall 10 disposed in parallel with the side walls 8A and 8B. The roof 9 is supported by the supply side walls 4 and 6, the side walls 8 </ b> A and 8 </ b> B, the partition wall 10, and the like, and covers the storage area 3. The storage area 3 is disposed between the side wall 8A and the partition wall 10. A plurality of radioactive substance storage containers 24 are arranged in a square lattice pattern on the floor 23 in the storage area 3.

  The storage building 2 is elongated from the air supply side wall 4 toward the air supply side wall 6. The air supply port 5 is formed in the air supply side wall 4 and is disposed in the center between both ends of the air supply side wall 4 and is located near the roof 9 (see FIG. 3). In the horizontal direction, the air supply side wall 4 continuously exists from each end of the air supply side wall 4 (an end connected to the side wall 8A and an end connected to the partition wall 35) to each end face of the air supply port 5. To do. The air supply port 7 is formed in the air supply side wall 6, is disposed in the center between both ends of the air supply side wall 6, and is located near the roof 9. In the horizontal direction, the air supply side wall 6 continuously exists from each end of the air supply side wall 6 (an end connected to the side wall 8A and an end connected to the partition wall 36) to each end face of the air supply port 7. To do. Below the air inlets 5 and 7, the air supply side walls 4 and 6 continuously exist between both ends.

  A partition wall 11 that defines the storage area 3 is installed between the storage area 3 and the supply side wall 4. A plurality of openings 13 for supplying cooling air are formed in the partition wall 11. The part of the partition wall 11 between the openings 13 becomes the support wall 12 and reaches the floor 23 of the storage area 3. A radiation shielding wall 17 is disposed between the air supply side wall 4 and the partition wall 11 in the storage building 2. The radiation shielding wall 17 extends downward from the ceiling 32 of the storage building 2, and both ends thereof are attached to the side wall 8 </ b> A and the partition wall 35. A pressure equalizing chamber 19 that also serves as a transport passage for the radioactive substance storage container 24 is formed between the partition wall 11 and the radiation shielding wall 17. A cooling air flow path 21 communicated with the air supply port 5 is formed between the radiation shielding wall 17 and the air side wall 4. The cooling air passage 21 extends in a range from the partition wall 35 located on the extension line of the partition wall 10 to the side wall 8A. Between the lower end of the radiation shielding wall 17 and the floor 23, an opening 33 for supplying cooling air from the cooling air flow path 21 to the pressure equalizing chamber 19 is formed. The opening 33 also extends from the partition wall 35 to the side wall 8A. The air supply port 5 is connected to an outside air intake passage 28 formed outside the supply side wall 4.

  A partition wall 14 that defines the storage area 3 is installed between the storage area 3 and the supply side wall 6. A plurality of openings 16 for supplying cooling air are formed in the partition wall 14. A portion of the partition wall 14 between the openings 16 serves as a support wall 15 and reaches the floor 23 of the storage area 3. A radiation shielding wall 18 is disposed between the air supply side wall 6 and the partition wall 14 in the storage building 2. The radiation shielding wall 18 extends downward from the ceiling 32 of the storage building 2, and both ends are attached to the side wall 8 </ b> A and the partition wall 36. A pressure equalizing chamber 20 that also serves as a transport passage for the radioactive substance storage container 24 is formed between the partition wall 14 and the radiation shielding wall 18. A cooling air supply flow path 22 communicated with the air supply port 7 is formed between the radiation shielding wall 18 and the air side wall 6. The cooling air flow path 22 extends in a range from the partition wall 36 located on the extension line of the partition wall 10 to the side wall 8A. Between the lower end of the radiation shielding wall 18 and the floor 23, an opening 34 for supplying cooling air from the cooling air supply flow path 22 to the pressure equalizing chamber 20 is formed. The opening 34 also extends from the partition wall 36 to the side wall 8A. The air supply port 75 is connected to an outside air intake passage 29 formed outside the air supply side wall 6.

  The support walls 12 and 15 are disposed so as to face a gap formed between the radioactive substance storage containers 24 adjacent to each other in a direction parallel to the supply side wall. A container receiving area 27 is formed between the partition wall 10 and the side wall 8B. An exhaust pipe 25 extending upward is installed on the roof 9. The exhaust cylinder 25 is disposed in the central portion between the air supply side wall 4 and the air supply side wall 6. The cooling air exhaust passage 26 formed in the exhaust cylinder 25 is connected to the storage area 3 and is also connected to the exhaust port 30 of the exhaust cylinder 25.

  The spent fuel assembly stored in the storage pool is stored in a radioactive substance storage container (for example, a metal cask) 24 in the nuclear power plant. The radioactive material storage container 24 that contains the spent fuel assembly and is sealed is transported to a container receiving area 27 in the storage building 2 of the radioactive material storage facility 1 by a transport truck. The radioactive substance storage container 24 is moved from the truck to a container transfer device (not shown) in the container receiving area 27. The radioactive substance storage container 24 is transported to the storage area 3 through the pressure equalizing chamber 19 (or the pressure equalizing chamber 20) by the movement of the container transport device, and stored in a predetermined position in the storage area 3.

  Due to the chimney effect of the exhaust cylinder 25, the air (outside air) taken in from the outside air intake passage 28 passes through the air supply port 5, the cooling air passage 21, the opening 33, the pressure equalizing chamber 19, and the opening 13, and the storage area 3 flows in. The radioactive substance storage container 24 placed in the storage area 3 is cooled by the inflowing cooling air. That is, the heat generated in the spent fuel assembly in the radioactive substance storage container 24 is removed by the cooling air. The cooling air that has cooled the radioactive substance storage container 24 is warmed and ascends in the cooling air exhaust passage 26 and is exhausted to the outside through the exhaust port 30. The air (outside air) taken in from the outside air intake passage 29 flows into the storage area 3 through the air supply port 7, the cooling air passage 22, the opening 34, the pressure equalizing chamber 20 and the opening 16, and is radioactive material. The storage container 24 is cooled. This cooling air is also warmed and flows into the cooling air exhaust passage 26. The air supply ports 5 and 7 have an opening area capable of supplying a cooling air amount necessary for cooling the radioactive substance storage container 24 stored in the storage area 3.

In the present embodiment, since one air supply port 5 is formed in the air supply side wall 4 at the center in the width direction of the air supply side wall 4 (the direction from the side wall 8A toward the partition wall 35), it is coupled to the side wall 8A. Between one end of the air supply side wall 4 to one end of the air supply port 5 and between the other end of the air supply side wall 4 coupled to the partition wall 35 to the other end of the air supply port 5. The air supply side wall 4 is continuously present. For this reason, the length of the air supply side wall 4 from the end connected to the side wall 8 </ b> A of the air supply side wall 4 in which the air supply port 5 is formed to the one end of the air supply port 5, and the air supply side wall 4. The length of the air supply side wall 4 from the end coupled to the partition wall 35 to one end of the air supply port 5 can be increased. Such a structure can increase the seismic load that the supply side wall 4 can handle with respect to earthquake motion parallel to the supply side wall 4 during an earthquake. That is, the earthquake resistance of the storage building 2 is improved. Since the air supply side wall 6 also has one air supply port 7 at the center in the width direction (the direction from the side wall 8A to the partition wall 36), as in the case of the air supply side wall 4, the above-mentioned earthquake motion On the other hand, the seismic load that the supply side wall 6 can handle can be increased. The earthquake resistance of the storage building 2 is further improved. (Based on the above effects, “the air supply port is arranged at the center of the air supply side wall, and the air supply side wall continuously exists from both ends of the air supply side wall to both ends of the air supply port”. However, this configuration also includes cases where the earthquake resistance of the storage building is not improved, and conversely, the case where the earthquake resistance of the storage building is lower than before is included. However, in this example, it is included in the ground motion parallel to the supply side wall 4 even if an intake port having a width of 0.5 is formed with respect to the supply side wall of 10. On the other hand, is the seismic load that the supply side wall can handle less reduced than before, and the concept of “central part” is also differently interpreted by people? Assuming that the width of the air supply port is smaller than the width of the air supply side wall (For example, “the ratio of the width of the air inlet to the air supply side wall is A% to B%” or “the air supply side relative to the air supply side wall width”) The length from one end of the side wall to one end of the air supply port is C% to D% ”), and this range should be described in the dependent claims of claims 1 and 2 and also in the examples. Please let us know the range where the accuracy of realization is high.
The radiation shielding wall (for example, made of concrete or iron) 17 disposed between the storage area 3, that is, the partition wall 11 and the air supply side wall 4 is supplied to the radiation shielding wall 17 when viewed from the storage area 3. Since the front surface of the mouth 5 is covered, γ rays emitted from the spent fuel assembly in the radioactive substance storage container 24 stored in the storage area 3 are shielded by the radiation shielding wall 17. Depending on the arrangement of the radiation shielding wall 17, a passage including the opening 33, the cooling air flow path 21 and the air supply port 5, which connects the pressure equalizing chamber 19 and the outside of the storage building 2 and guides the cooling air, is bent and formed. The For this reason, it can also prevent that said gamma ray leaks outside through this channel | path. Two such shielding functions for gamma rays can also be achieved by the arrangement of the radiation shielding wall 18.

  The radiation shielding walls 17 and 18 not only have a function of shielding γ rays, but also a function of evenly distributing the cooling air flowing from the air supply ports 5 and 7 in the pressure equalizing chambers 19 and 20 in the width direction of the air supply side wall. Also have. The function of uniformly distributing the cooling air will be described by taking the radiation shielding wall 17 as an example. The cooling air flowing in from the air supply port 5 is blocked by the radiation shielding wall 17 and flows downward along the radiation shielding wall 17 in the cooling air flow path 21. Since the radiation shielding wall 17 that defines the cooling air flow path 21 exists in the range from the side wall 8A to the partition wall 35, the cooling air that has flowed into the cooling air flow path 21 falls when the cooling air flow path 21 descends. The air supply port 5 is wider than the horizontal width, and is distributed to the vicinity of the side wall 8A and the partition wall 35. Accordingly, the cooling air supplied from the opening 33 to the pressure equalizing chamber 19 does not concentrate at the position of the horizontal width of the air supply port 5, and the entire width of the pressure equalizing chamber 19 from the side wall 8 </ b> A to the partition wall 35. Has spread. Thus, the radiation shielding wall 17 can distribute the cooling air more uniformly into the pressure equalizing chamber 19 in the width direction.

  In this embodiment, since the partition wall 11 having the opening 13 is provided, the distribution of the cooling air from the pressure equalizing chamber 19 into the storage area 3 can be made more uniform, and the partition having the opening 16 formed therein. Since the wall 14 is provided, the distribution of the cooling air from the pressure equalizing chamber 20 into the storage area 3 can be made more uniform. The effect of this embodiment that can make the distribution of the cooling air supplied from the pressure equalizing chamber to the storage area 3 more uniform will be described in detail by taking the partition wall 11 as an example. The partition wall 11 including a plurality of support walls 12 is arranged at the boundary between the storage area 3 and the pressure equalizing chamber 19, and the pressure loss from the pressure equalizing chamber 19 to the storage area 3 increases. Thereby, the pressure in the pressure equalizing chamber 19 into which the cooling air has flowed from the opening 33 can be made uniform in the width direction. The pressure of the respective cooling air supplied from the pressure equalizing chamber 19 to the storage area 3 through each opening 13 is substantially the same, and the cooling air in the entire area from the side wall 8 </ b> A to the partition wall 10 in the storage area 3. Can be more evenly distributed. Therefore, each radioactive substance storage container 24 in the storage area 3 is cooled substantially uniformly in the width direction.

  In this embodiment, the support wall 12 is disposed so as to face the gap formed between the radioactive substance storage containers 24 adjacent to each other in the direction parallel to the air supply side wall 4 as described above. The cooling effect of the radioactive substance storage container 24 located in the vicinity of the support wall 12 is also increased. The cooling effect of the radioactive substance storage container 24 located in the vicinity of the support wall 15 is also increased.

  The lower end of the support wall 12 which is a part of the partition wall 11 is installed on the floor 23 of the storage building 2, and the upper end of the partition wall 11 supports the roof 9. The lower end of the support wall 15 that is a part of the partition wall 14 is installed on the floor 23 of the storage building 2, and the upper end of the partition wall 14 supports the roof 9. The partition walls 11 and 14 can also support the load of the roof 9 and the exhaust stack 25. Therefore, the space | interval of the side wall 8A and the partition 10 and the space | interval of the air supply side wall 4 and the air supply side wall 6 can be expanded, and the storage area 3 can be enlarged. Accordingly, the number of radioactive substance storage containers 24 that can be stored in the storage area 3 can be increased.

  In the present embodiment, the pressure equalization chambers 19 and 20 are used as the transport passages for the radioactive substance storage container 24, so that it is not necessary to separately provide the pressure equalization chamber and the transport passage in the storage building 2. Therefore, the storage building 2 can be made compact.

FIG. 3 is a cross-sectional view taken along the line II of FIG. 2, showing a configuration of a radioactive substance storage facility according to a preferred embodiment of the present invention. It is II-II sectional drawing of FIG. It is an arrow view of the A direction of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Radioactive material storage facility, 2 ... Storage building, 3 ... Storage area, 4, 6 ... Supply side wall, 5, 7 ... Supply port, 11, 14 ... Partition wall, 12, 15 ... Support wall, 13, 16, 33, 34 ... opening, 17, 18 ... radiation shielding wall, 19, 20 ... pressure equalization chamber, 21, 22 ... cooling air supply flow path, 24 ... radioactive substance storage container, 25 ... exhaust pipe, 26 ... cooling Air exhaust flow path, 27 ... container receiving area.

Claims (6)

In a radioactive material storage facility provided with a storage building having a storage area for storing radioactive material storage containers inside,
The storage building has a pair of first side walls facing each other and a second side wall facing and arranged in a direction intersecting the first side walls,
The storage area is surrounded by the pair of first sidewalls and the pair of second sidewalls;
An air supply port for taking in outside air supplied to the storage area is formed in at least one of the pair of first side walls, and at least a part of the air supply port is formed in the first side wall in which the air supply port is formed. Located at the center between both ends,
The first side wall in which the air supply port is formed extends from one end coupled to one of the second side walls to one end of the air supply port located in the central portion, and the other of the first side wall. The radioactive substance storage facility, which is continuously present between the other end coupled to the two side walls and the other end of the air supply port located in the central portion. In a radioactive material storage facility provided with a storage building having a storage area for storing radioactive material storage containers inside,
The storage building has a pair of first side walls facing each other and a second side wall facing and arranged in a direction intersecting the first side walls,
The storage area is surrounded by the pair of first sidewalls and the pair of second sidewalls;
One air supply port for taking in outside air supplied to the storage area is formed in at least one of the pair of first side walls,
The first side wall in which the air supply port is formed is between one end coupled to one of the second side walls and one end of the air supply port, and from the other end coupled to the other second side wall. The radioactive substance storage facility, which is continuously present up to the other end of the air supply port.   A partition wall is installed between the first side wall in which the air supply port is formed and the storage region, and a plurality of first openings for guiding the outside air flowing in from the air supply port to the storage region are formed in the partition wall. 2. A pressure equalizing chamber is formed between the plurality of first openings and the air supply port, and is formed between the partition wall and the first side wall in which the air supply port is formed. Or the radioactive substance storage facility of Claim 2.   The radioactive substance storage facility according to claim 3, wherein the partition wall supports a roof of the storage building.   5. The radioactive substance storage facility according to claim 3, wherein the pressure equalizing chamber also serves as a transfer passage used when transferring the radioactive substance storage container to the storage area.   A radiation shielding wall extending downward from the ceiling of the storage building is installed between the first side wall in which the air supply port is formed and the partition wall, and the lower end of the radiation shielding wall and the floor of the storage building A second opening through which the outside air passes is formed, and an outside air supply passage connecting the supply opening and the second opening is formed between the first side wall in which the supply opening is formed and the radiation shielding. The radioactive substance storage facility according to claim 3, which is formed between the walls.

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