JP2016156749A - Fuel storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress occurrence of uneven supply of an auxiliary cooling water to a nuclear fuel.SOLUTION: A fuel storage facility 31 includes: a fuel pool 32 that can store a cooling water W1 with more than one type of nuclear fuel 38 immersed therein; and an auxiliary cooling water supply unit supplying an auxiliary cooling water W2 to all of the region in the fuel pool 32 where the nuclear fuels 38 are stored.SELECTED DRAWING: Figure 3A

Description

  The present invention relates to a fuel storage facility for temporarily storing spent fuel taken out of a nuclear reactor.

  One of the nuclear power plants is a pressurized water reactor. This pressurized water reactor uses light water as a reactor coolant and neutron moderator, and makes this high temperature and pressure water that does not boil throughout the primary system. Water is sent to a steam generator to generate steam by heat exchange, and this steam can be sent to a turbine generator to generate electricity.

  Such a nuclear power plant is provided with a fuel storage facility for temporarily storing nuclear fuel (fuel assembly) such as spent fuel taken out from the pressurized water reactor. The fuel storage facility has a fuel pool in which a plurality of nuclear fuels are arranged. This fuel pool cools these nuclear fuels by immersing the nuclear fuel in cooling water stored inside. Cooling water stored in the fuel pool is supplied by an electric pump. This electric pump is supplied with electric power from an external power source and also has a backup power source. However, since this electric pump may not operate in an emergency when power from an external power source and a backup power source is not supplied, the fuel storage facility may have another means for cooling nuclear fuel in an emergency. For example, Patent Document 1 describes an emergency cooling water supply facility that supplies emergency cooling water (auxiliary cooling water) for cooling nuclear fuel in a fuel pool in an emergency. An emergency cooling water supply facility may have a sprinkler for discharging auxiliary cooling water toward the nuclear fuel. This sprinkler is generally provided on the ceiling or wall surface of the fuel pool building.

Japanese Patent Application Laid-Open No. 2014-181982

  However, in the sprinkler, when a plurality of nuclear fuels are arranged in the fuel pool, there is a possibility that the supply of auxiliary cooling water to the nuclear fuel becomes uneven. For example, if the sprinkler is installed on the ceiling of the building, a sufficient amount of auxiliary cooling water can be supplied to the nuclear fuel located near the lower part of the sprinkler, but the nuclear fuel away from the lower part of the sprinkler can be supplied from the sprinkler. Auxiliary cooling water supply may be insufficient. Similarly, when a sprinkler is provided on the wall surface of a building, for example, there is a risk that the nuclear fuel distant from the wall surface is insufficiently supplied with auxiliary cooling water from the sprinkler.

  Therefore, the present invention suppresses uneven supply of auxiliary cooling water to nuclear fuel even when a plurality of nuclear fuels are arranged in the fuel pool in an emergency such as loss of external power. The object is to provide a fuel storage facility.

  In order to solve the above-described problems and achieve the object, a fuel storage facility according to the present invention includes a fuel pool capable of storing a plurality of nuclear fuels immersed in cooling water stored therein, and a plurality of fuel pools in the fuel pool. An auxiliary cooling water supply unit for supplying auxiliary cooling water to the entire fuel storage area, which is an area in which the nuclear fuel is stored.

  In this fuel storage facility, since the auxiliary cooling water supply unit supplies auxiliary cooling water to the entire fuel storage area where the nuclear fuel is arranged, the auxiliary cooling water is supplied to each nuclear fuel arranged in the fuel storage area. It can suppress that supply becomes uneven.

  In the fuel storage facility, the auxiliary cooling water supply unit has a supply port portion that is an opening for supplying the auxiliary cooling water into the fuel pool, and the supply port portion is provided in the fuel pool. It is preferable that the plurality of nuclear fuels are provided below the upper ends in the vertical direction. The auxiliary cooling water supply unit has a supply port provided below the upper end in the vertical direction of the nuclear fuel. Therefore, this fuel storage facility can fill the auxiliary cooling water from the bottom of the fuel pool. Therefore, this fuel storage facility can suitably suppress the supply of auxiliary cooling water from becoming uneven.

  In the fuel storage facility, the fuel pool is provided in a fuel storage building, and the auxiliary cooling water supply unit has a water injection port portion at one end portion which is the supply port portion and the other end portion. An auxiliary cooling water pipe portion that is a pipe provided outside the fuel storage building, and the auxiliary cooling water pipe portion is supplied with the auxiliary cooling water from the water injection port portion, so that the fuel pool It is preferable that the auxiliary cooling water can be supplied inside. Since this fuel storage facility has an auxiliary cooling water piping section, it is possible to cool the nuclear fuel in the fuel pool safely and while suppressing unevenness in the supply of auxiliary cooling water.

  In the fuel storage facility, the fuel pool is provided inside a fuel storage building, and the auxiliary cooling water supply unit has one opening, the supply port portion opening at the bottom of the fuel pool, and the other The water injection port part which is an opening has an auxiliary cooling water pipe part which is a pipe line opened to the outside of the fuel storage building, and the auxiliary cooling water pipe part receives the auxiliary cooling water from the water injection port part. It is preferable that the auxiliary cooling water can be supplied into the fuel pool by being supplied. Since this fuel storage facility can supply auxiliary cooling water from the bottom of the fuel pool, the auxiliary cooling water can be filled from the bottom of the fuel pool. Therefore, this fuel storage facility can preferably suppress the supply of auxiliary cooling water from becoming uneven.

  In the fuel storage facility, it is preferable that the water injection port is provided vertically above the supply port. Since this fuel storage facility can supply the auxiliary cooling water using the water head, the auxiliary cooling water can be supplied more suitably.

  In the fuel storage facility, the auxiliary cooling water piping section circulates around a plurality of the nuclear fuels from an intermediate portion that is a portion between the water injection port portion and the supply port portion to the supply port portion. It is preferable to have a plurality of hole portions that extend downward in the vertical direction and are holes for dropping the auxiliary cooling water into the fuel pool between the intermediate portion and the supply port portion. . This fuel storage facility can supply auxiliary cooling water around the nuclear fuel through a plurality of holes. Therefore, this fuel storage facility can more suitably suppress the supply of auxiliary cooling water from becoming uneven.

  In the fuel storage facility, the auxiliary cooling water supply unit includes a water tank unit that is disposed at an upper portion of the fuel pool and is supplied with auxiliary cooling water therein, and the water tank unit has an upper part of the fuel storage region. It is preferable to have a bottom part to cover and a plurality of holes provided in the bottom part, and to drop auxiliary cooling water from the plurality of holes to the plurality of nuclear fuels. As for this water tank part, the bottom face part has covered the upper part of the fuel storage area | region, and auxiliary cooling water is dripped from the several hole provided in the bottom face part. Accordingly, the water tank portion can drop the auxiliary cooling water over the entire fuel storage region spreading in a planar shape. Therefore, this fuel storage facility can preferably suppress the supply of auxiliary cooling water from becoming uneven.

  In the fuel storage facility, it is preferable that the plurality of holes are provided at a predetermined interval over the entire region above the fuel storage region. In this fuel storage facility, since the hole portion is provided over the entire region above the fuel storage region, it is possible to more suitably suppress the supply of auxiliary cooling water from becoming uneven.

  In the fuel storage facility, the auxiliary cooling water supply unit preferably includes a water tank auxiliary cooling water supply unit that supplies the auxiliary cooling water to the water tank unit. Since this fuel storage facility has a water tank auxiliary cooling water supply unit, it is possible to appropriately supply auxiliary cooling water to the water tank unit.

  In the fuel storage facility, it is preferable that the bottom portion of the water tank portion is inclined downward in the vertical direction as the water tank portion is separated from the water tank auxiliary cooling water supply unit. In this water tank part, the auxiliary cooling water is easily guided to a place away from the place where the auxiliary cooling water is supplied, and the amount of the auxiliary cooling water dripped from the hole part is not uniform. Suppress. Therefore, this fuel storage facility can more suitably suppress the supply of auxiliary cooling water to the nuclear fuel from becoming uneven.

  In the fuel storage facility, the fuel pool and the water tank unit are provided inside the fuel storage building, and the water tank auxiliary cooling water supply unit has a supply port portion which is one end portion inside the fuel storage building. A water injection port portion provided at the other end of the fuel storage building has an auxiliary cooling water piping portion, and the auxiliary cooling water piping portion is connected to the water injection port portion from the water injection port portion. It is preferable that the auxiliary cooling water can be supplied to the water tank section by supplying the auxiliary cooling water. Since this fuel storage facility has an auxiliary cooling water piping section, it is possible to cool the nuclear fuel in the fuel pool safely and while suppressing unevenness in the supply of auxiliary cooling water.

  In the fuel storage facility, it is preferable that the water injection port is provided vertically above the supply port. Since this fuel storage facility can supply the auxiliary cooling water using the water head, the auxiliary cooling water can be supplied more suitably.

  The fuel storage facility generates condensed water by cooling the cooling water or the auxiliary cooling water that has become steam due to heat of the nuclear fuel, and drops the condensed water to the fuel pool. It is preferable to have a heat exchanger. In this fuel storage facility, the nuclear fuel can be cooled again by the condensed water obtained by condensing the vapor in the heat exchanger. Therefore, the fuel storage facility can cool the nuclear fuel more appropriately in an emergency.

  According to the present invention, it is possible to suppress uneven supply of auxiliary cooling water to nuclear fuel in an emergency such as loss of an external power source.

FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant. FIG. 2 is a schematic view showing a reactor containment vessel. FIG. 3A is a diagram schematically illustrating the configuration of the fuel storage facility according to the first embodiment. FIG. 3B is a top view of the fuel pool according to the first embodiment as viewed from above. FIG. 4 is a diagram schematically showing the structure of the fuel rack. FIG. 5 is a diagram schematically illustrating the configuration of the fuel storage facility according to the second embodiment. FIG. 6 is a top view of a part of the auxiliary cooling water piping section according to the second embodiment as viewed from above. FIG. 7A is a diagram schematically illustrating the configuration of the fuel storage facility according to the third embodiment. FIG. 7B is a top view of the fuel pool according to the third embodiment as viewed from above. FIG. 8A is a diagram schematically illustrating the configuration of the fuel storage facility according to the first modification. FIG. 8B is a diagram schematically illustrating the configuration of another example of the fuel storage facility according to the first modification. FIG. 8C is a diagram schematically illustrating a configuration of another example of the fuel storage facility according to the first modification. FIG. 9 is a diagram schematically illustrating the configuration of the fuel storage facility according to the fourth embodiment. FIG. 10 is a top view of the water tank unit according to the fourth embodiment as viewed from above. FIG. 11 is a schematic diagram showing a configuration of a water tank unit of another example. FIG. 12 is a top view of another example of the water tank portion as viewed from above. FIG. 13 is a diagram schematically illustrating the configuration of the fuel storage facility according to the second modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment, Moreover, when there are two or more embodiments, what comprises a combination of each Example is also included.

(First embodiment)
FIG. 1 is a schematic configuration diagram illustrating a nuclear power plant. FIG. 2 is a schematic view showing a reactor containment vessel. The nuclear reactor applied to the nuclear power plant of the present embodiment uses light water as a reactor coolant and a neutron moderator to produce high-temperature and high-pressure water that does not boil over the entire primary system, and sends this high-temperature and high-pressure water to a steam generator. This is a pressurized water reactor (PWR) that generates steam by heat exchange and sends the steam to a turbine generator to generate electricity.

  That is, in a nuclear power plant having this pressurized water reactor, as shown in FIG. 1, a pressurized water reactor 12 and a steam generator 13 are stored in a reactor containment vessel 11, and this pressurized water atom is stored. The furnace 12 and the steam generator 13 are connected via cooling water pipes 14 and 15, a pressurizer 16 is provided in the cooling water pipe 14, and a cooling water pump 17 is provided in the cooling water pipe 15. In this case, light water is used as the moderator and the primary cooling water, and the primary cooling system is controlled by the pressurizer 16 so as to maintain a high pressure state of about 160 atm in order to suppress boiling of the primary cooling water in the core. Yes. Accordingly, in the pressurized water reactor 12, light water is heated as primary cooling water using low-enriched uranium or MOX as nuclear fuel, and the cooling water pipe 14 is maintained in a state where the high-temperature primary cooling water is maintained at a predetermined high pressure by the pressurizer 16. To the steam generator 13. In the steam generator 13, heat exchange is performed between the high-temperature and high-pressure primary cooling water and the secondary cooling water, and the cooled primary cooling water is returned to the pressurized water reactor 12 through the cooling water pipe 15.

  The steam generator 13 is connected to a turbine 18 and a condenser 19 provided outside the reactor containment vessel 11 through cooling water pipes 20 and 21, and a water supply pump 22 is provided in the cooling water pipe 21. ing. Further, a generator 23 is connected to the turbine 18, and a condenser pipe 19 is connected to a water intake pipe 24 and a drain pipe 25 for supplying and discharging cooling water (for example, seawater). Accordingly, the steam generated by exchanging heat with the high-pressure and high-temperature primary cooling water in the steam generator 13 is sent to the turbine 18 through the cooling water pipe 20, and the turbine 18 is driven by this steam to generate the generator 23. To generate electricity. The steam that has driven the turbine 18 is cooled by the condenser 19, and then returned to the steam generator 13 through the cooling water pipe 21.

  As shown in FIG. 2, the reactor containment vessel 11 of the nuclear power plant configured as described above accommodates the above-described pressurized water reactor 12, the steam generator 13, the pressurizer 16, and the like. Further, a fuel storage building 30 is provided adjacent to the reactor containment vessel 11. The fuel storage building 30 is provided with a fuel storage facility 31 according to the present embodiment. Hereinafter, the fuel storage facility 31 will be described.

  FIG. 3A is a diagram schematically illustrating the configuration of the fuel storage facility according to the first embodiment. FIG. 3B is a top view of the fuel pool according to the first embodiment as viewed from above. FIG. 4 is a diagram schematically showing the structure of the fuel rack. As shown in FIG. 3A, the fuel storage building 30 is provided with a fuel storage facility 31 that is a facility for storing nuclear fuel. As illustrated in FIG. 3A, the fuel storage facility 31 includes a fuel pool 32, a cooling water supply unit 34, a pipe 35, and an auxiliary cooling water pipe unit 40. The fuel storage facility 31 is also provided with a transport device (not shown) that moves nuclear fuel.

  As shown in FIGS. 3A and 3B, the fuel pool 32 has a bottom portion 32a that is a bottom surface along the horizontal direction and four wall surfaces 32b along the vertical direction, and is filled with cooling water W1. Yes. The cooling water W1 is water for cooling the nuclear fuel 38. The fuel pool 32 is provided in the fuel storage building 30. In the present embodiment, the fuel pool 32 has a bottom 32a provided below the ground surface Gr in the vertical direction X. However, the bottom 32a of the fuel pool 32 may be provided above the ground surface Gr in the vertical direction X.

  A plurality of fuel racks 36 are disposed in the fuel pool 32. The fuel rack 36 is a container that stores a plurality of nuclear fuels 38 therein. As shown in FIG. 4, the fuel rack 36 has a rectangular tube shape, has a bottom surface portion, and is open upward. In the fuel rack 36, a plurality of square tubes along the vertical direction are arranged at equal intervals in the horizontal direction, and a plurality of cell storage portions 37 are formed by fixing each square tube by welding. The fuel rack 36 can be stored by inserting the nuclear fuel 38 into the plurality of cell storage portions 37 from above, which is open along the vertical direction. Since the fuel rack 36 has a bottom surface portion, the bottom surface of the nuclear fuel 38 is positioned above the bottom surface of the fuel rack 36 in the vertical direction. However, the configuration of the fuel rack 36 is not limited to this as long as it stores the nuclear fuel 38. Here, the nuclear fuel 38 is a fuel assembly in which a plurality of fuel rods are bundled. The nuclear fuel 38 is a used fuel assembly taken out from the nuclear reactor or an unused fuel assembly installed in the nuclear reactor.

  As shown in FIGS. 3A and 3B, the plurality of fuel racks 36 are arranged in the fuel storage region 33 in the fuel pool 32 at a predetermined interval. In the present embodiment, a total of six fuel racks 36 in three rows and two columns are arranged, but the number of arrangements is not limited to six and is arbitrary. As shown in FIG. 3B, the fuel storage region 33 is a region parallel to the bottom 32a, and is a region where a plurality of fuel racks 36, that is, a plurality of nuclear fuels 38 are stored. In the fuel pool 32, the nuclear fuel 38 is not disposed outside the fuel storage region 33. As shown in FIG. 3B, the fuel storage area 33 is an area having four sides at positions separated from the four wall surfaces 32b of the fuel pool 32 by a predetermined distance S. However, the fuel storage area 33 may be a predetermined area in the fuel pool 32. Any position may be used.

  The amount of water in the cooling water W1 in the fuel pool 32 is adjusted so that all the fuel racks 36 are immersed in the cooling water W1. The fuel rack 36 is open at the top, and a plurality of nuclear fuels 38 are arranged at predetermined intervals. Accordingly, the fuel rack 36 is filled with the cooling water W <b> 1 between the nuclear fuels 38.

  The cooling water supply unit 34 supplies the cooling water W <b> 1 to the fuel pool 32. The cooling water supply unit 34 is an electric pump and is operated by an external power source. Moreover, the cooling water supply unit 34 has a backup power source that can operate even when the external power source does not operate. The cooling water supply unit 34 circulates the cooling water W1 in the fuel pool 32 through the two pipes 35 to cool the cooling water W1. In the present embodiment, the cooling water supply unit 34 is provided in the fuel storage building 30, but may be provided outside the fuel storage building 30.

  The auxiliary cooling water piping unit 40 constitutes an auxiliary cooling water supply unit that supplies the auxiliary cooling water W <b> 2 to the entire fuel storage region 33. The auxiliary cooling water W2 is cooling water supplied as an auxiliary to cool the nuclear fuel 38 in the fuel pool 32 when the cooling water supply unit 34 becomes inoperable. As shown in FIG. 3A, the auxiliary cooling water piping section 40 is a pipe having a supply port portion 42 that is one end portion that opens and a water injection port portion 44 that is the other end portion that opens. The supply port portion 42 is an opening portion for supplying the auxiliary cooling water W2 into the fuel pool 32, and the water injection port portion 44 is an opening portion for pouring the auxiliary cooling water W2 into the auxiliary cooling water pipe portion 40. is there. The auxiliary cooling water piping section 40 has a valve 45 that can be opened and closed.

  The auxiliary cooling water piping part 40 has a water injection port part 44 provided outside the fuel storage building 30. The auxiliary cooling water piping part 40 extends into the fuel storage building 30 from the water injection port part 44 toward the supply port part 42. The water injection port 44 is provided above the supply port 42 in the vertical direction X. The water injection port 44 has a connection mechanism that can be connected to the supply mechanism of the auxiliary cooling water W2 outside the fuel storage building 30.

  In the auxiliary cooling water piping section 40, the supply port section 42 is provided inside the fuel pool 32 and in the vicinity of the bottom section 32 a of the fuel pool 32. More specifically, the supply port portion 42 is provided below the lower end portion 38 b, which is the lower end in the vertical direction X, of the nuclear fuel 38 in the fuel pool 32. In addition, the auxiliary cooling water piping section 40 extends in the vertical direction X along the wall surface 32 b of the fuel pool 32 from the intermediate section 46, which is a location between the water injection port section 44 and the supply port section 42, toward the supply port section 42. Extending below. However, if the supply port portion 42 is provided inside the fuel pool 32 and below the upper end portion 38a that is the upper end in the vertical direction X of the nuclear fuel 38 in the fuel pool 32, It is not restricted to such a structure. Further, it is preferable that the supply port portion 42 of the auxiliary cooling water piping portion 40 is located inside the fuel storage region 33. Further, the auxiliary cooling water piping section 40 may have a plurality of supply port portions 42 branched, and the plurality of supply port portions 42 may be arranged at different positions inside the fuel storage region 33.

  In the auxiliary cooling water piping part 40, the water injection port part 44 is connected to the auxiliary cooling water injection part 100 in an emergency when the cooling water supply part 34 does not operate. The auxiliary cooling water injection unit 100 is an external facility that does not use a power source in the nuclear power plant, and is an facility that can supply the auxiliary cooling water W2 even in an emergency in which the cooling water supply unit 34 does not operate. The auxiliary cooling water injection unit 100 is an external pump such as a fire truck or a portable pump. The auxiliary cooling water piping unit 40 is supplied with the auxiliary cooling water W2 from the water injection port 44 by the auxiliary cooling water injection unit 100 and supplies the auxiliary cooling water W2 into the fuel pool 32 from the supply port 42 in an emergency. Can do. In addition, the auxiliary cooling water piping unit 40 is not connected to the auxiliary cooling water injection unit 100 and does not supply the auxiliary cooling water W2 at the normal time when the cooling water supply unit 34 operates.

  Further, in the auxiliary cooling water piping part 40, the water injection port part 44 may be connected to the high place water injection part 110 in an emergency. The high water injection unit 110 is a water tank that is provided above the water injection port 44 in the vertical direction X and in which auxiliary cooling water W2 is stored. When the auxiliary cooling water piping section 40 is connected to the high-place water injection section 110, gravity water injection is possible, and no power source is required for water injection. The high water injection section 110 may be a high water source such as a pond above the water injection port 44 in the vertical direction X. The water injection port 44 is connected to the high water injection section 110 via the high water injection pipe 112. In this case, the auxiliary cooling water piping unit 40 is supplied with the auxiliary cooling water W2 from the water injection port 44 by the high water injection unit 110 and supplies the auxiliary cooling water W2 from the supply port 42 into the fuel pool 32 in an emergency. can do. The auxiliary cooling water piping unit 40 is not connected to the high-place water injection unit 110 and does not supply the auxiliary cooling water W2 in normal times. However, the auxiliary cooling water piping section 40 may be connected to the high-place water injection section 110 even during normal times. In this case, the auxiliary cooling water piping unit 40 normally closes the valve 45 and does not supply the auxiliary cooling water W2 into the fuel pool 32, and opens the valve 45 in an emergency to supply the auxiliary cooling water W2 into the fuel pool 32. Supply. Moreover, although the auxiliary cooling water piping part 40 is connected to either the auxiliary cooling water injection part 100 or the high place water injection part 110, it may be connected to both. Further, the fuel storage facility 31 may include a plurality of auxiliary cooling water piping sections 40, and the auxiliary cooling water W2 may be supplied from the plurality of auxiliary cooling water injection sections 100 and the high place water injection sections 110.

  Here, as a comparative example, a fuel storage facility 31X that supplies the auxiliary cooling water W2 from the sprinkler of the fuel pool 32 will be described. The sprinkler is small in size with respect to the fuel pool 32, and it can be said that the sprinkler is arranged in a dot shape with respect to the fuel storage region 33 that spreads in a planar shape. Therefore, in this case, the auxiliary cooling water W2 discharged from the sprinkler is not supplied to the entire fuel storage area 33 in the fuel pool 32, and the supply of the auxiliary cooling water W2 to the nuclear fuels 38 may become uneven. is there. For example, this sprinkler can supply a sufficient amount of auxiliary cooling water W2 to the nuclear fuel 38 in the vicinity of the sprinkler, but sufficient auxiliary cooling water W2 to the nuclear fuel 38 located away from the sprinkler. There is a risk that a sufficient amount cannot be supplied. Further, for example, when the cooling water W1 cannot be cooled in an emergency, the cooling water evaporates due to the decay heat of the nuclear fuel 38, and the steam of the cooling water W1 rises toward the upper part of the fuel pool 32 in the vertical direction X. When the sprinkler is provided above the vertical direction X of the fuel pool 32, the auxiliary cooling water W2 from the sprinkler is discharged opposite to the direction of the steam. There is a possibility that the region 33 is not properly supplied. Thus, in the fuel storage facility 31X, the supply of the auxiliary cooling water W2 to each nuclear fuel 38 in the fuel pool 32 may be uneven.

  On the other hand, the fuel storage facility 31 according to the first embodiment stores a fuel pool 32 in which a plurality of nuclear fuels 38 can be stored by immersing them in the cooling water W1 stored therein, and a plurality of nuclear fuels 38 stored in the fuel pool 32. An auxiliary cooling water supply unit that supplies the auxiliary cooling water W2 to the entire fuel storage region 33. The auxiliary cooling water supply unit supplies the auxiliary cooling water W2 to the entire fuel storage area 33 in which the nuclear fuel 38 is arranged. Therefore, the auxiliary cooling water W2 is supplied to each nuclear fuel 38 arranged in the fuel storage area 33. It can suppress that supply becomes uneven.

  More specifically, the fuel storage facility 31 includes an auxiliary cooling water piping unit 40 having a supply port 42 that is an opening for supplying the auxiliary cooling water W2 into the fuel pool 32 as an auxiliary cooling water supply unit. I have. The supply port portion 42 is provided in the fuel pool 32 and below the upper end portions 38 a of the plurality of nuclear fuels 38 in the vertical direction X. In the auxiliary cooling water piping section 40, the supply port section 42 is provided below the upper end section 38 a of the nuclear fuel 38, so that the auxiliary cooling water W <b> 2 can be filled from the bottom section 32 a of the fuel pool 32. The auxiliary cooling water W2 filled from the bottom portion 32a reaches the entire fuel storage region 33 spreading in a planar shape. In addition, since the auxiliary cooling water piping section 40 is provided below the upper end portion 38a of the nuclear fuel 38, the auxiliary cooling water piping section 40 suppresses the influence of the steam moving upward of the fuel pool 32, and the steam causes the flow of the flow path. It is possible to prevent the direction from changing. Therefore, the auxiliary cooling water piping section 40 can suitably suppress the supply of the auxiliary cooling water W2 from becoming uneven for each nuclear fuel 38 disposed in the fuel storage region 33.

  In the fuel storage facility 31 according to the first embodiment, the fuel pool 32 is provided inside the fuel storage building 30. And as for the auxiliary cooling water piping part 40 as an auxiliary cooling water supply part which concerns on 1st Embodiment, one edge part is the supply port part 42, and the other edge part is provided in the exterior of the fuel storage building 30. The water mouth portion 44. The auxiliary cooling water piping unit 40 can supply the auxiliary cooling water W <b> 2 into the fuel pool 32 by supplying the auxiliary cooling water W <b> 2 from the water injection port 44. In the fuel storage facility 31, for example, even when all power sources in the nuclear power plant cannot be used in an emergency, the water injection port portion 44 outside the fuel storage building 30 is provided by an external facility that does not use the power source in the nuclear power plant. Therefore, the auxiliary cooling water pipe portion 40 can be injected with the auxiliary cooling water W2. Therefore, the fuel storage facility 31 can reliably cool the nuclear fuel 38 in the fuel pool 32 even in an emergency. Further, the auxiliary cooling water piping section 40 can be easily attached to an existing fuel storage facility that does not have such a piping. Furthermore, the fuel storage facility 31 has the water injection port 44 provided outside the fuel storage building 30, so that the worker can enter the fuel storage building 30 safely and supply the auxiliary cooling water W <b> 2. The nuclear fuel 38 in the fuel pool 32 can be cooled while suppressing the non-uniformity. Furthermore, since the water injection port 44 is provided outside the fuel storage building 30, for example, an auxiliary cooling water injection unit 100 that is a fire truck, for example, a high water tank 110 or a high water injection unit 110 that is a high water source, The supply source of the auxiliary cooling water can be selected flexibly, and the auxiliary cooling water can be appropriately supplied even in an emergency.

  Further, in the auxiliary cooling water piping part 40, the water injection port part 44 is provided above the supply port part 42 in the vertical direction X. Therefore, since the fuel storage facility 31 according to the first embodiment can supply the auxiliary cooling water W2 using the water head, the auxiliary cooling water W2 can be supplied more preferably.

(Second Embodiment)
Next, a second embodiment will be described. The fuel storage facility 31A according to the second embodiment is different from the first embodiment in the shape of the auxiliary cooling water piping section. The description of the same configuration as that of the first embodiment of the fuel storage facility 31A according to the second embodiment will be omitted.

  FIG. 5 is a diagram schematically illustrating the configuration of the fuel storage facility according to the second embodiment. FIG. 6 is a top view of a part of the auxiliary cooling water piping section according to the second embodiment as viewed from above. As shown in FIG. 5, the auxiliary cooling water piping part 40A included in the fuel storage facility 31A according to the second embodiment has a shape of a leading pipe part 47A that is a pipe part from the intermediate part 46A to the supply port part 42A. It differs from the auxiliary cooling water piping part 40 which concerns on 1 embodiment. The intermediate portion 46A is a location between the water injection port portion 44 and the supply port portion 42A, as in the first embodiment, and is a location inside the fuel storage building 30.

  As shown in FIGS. 5 and 6, the leading pipe portion 47 </ b> A circulates around the plurality of fuel racks 36, that is, around the plurality of nuclear fuels 38 (more specifically, around the fuel storage region 33). Extends downward in the vertical direction X toward the supply port portion 42A. The intermediate portion 46A is disposed above the upper end portion 38a of the nuclear fuel 38 in the vertical direction X, and the front pipe portion 47A circulates around the nuclear fuel 38 from above the nuclear fuel 38, but is not limited thereto. The intermediate portion 46A may be provided below the upper end portion 38a in the vertical direction X.

  Further, the front pipe portion 47A is provided with a plurality of holes 48A from the intermediate portion 46A along the supply port portion 42A. The plurality of holes 48A are open downward in the vertical direction X. As long as a plurality of the holes 48A are provided from the intermediate part 46A along the supply port part 42A, the shape and the number thereof are arbitrary.

  As described above, the auxiliary cooling water piping section 40A according to the second embodiment is configured such that the leading pipe section 47A, which is a location from the intermediate section 46A to the supply port section 42A, circulates around the plurality of nuclear fuels 38, It extends downward in the vertical direction X from 46A toward the supply port portion 42A. The auxiliary cooling water piping part 40A has a plurality of holes 48A in the front pipe part 47A. That is, the auxiliary cooling water piping section 40A is provided with a plurality of holes 48A along the periphery of the plurality of nuclear fuels 38 on the upstream side of the auxiliary cooling water W2 with respect to the supply port section 42A. For example, when the cooling water W1 evaporates due to the decay heat of the nuclear fuel 38 in an emergency, and the water level of the cooling water W1 falls below the intermediate part 46A, the auxiliary cooling water piping part 40A has a plurality of holes 48A. The auxiliary cooling water W <b> 2 is dropped around the nuclear fuel 38. Therefore, the auxiliary cooling water pipe section 40A has the supply port section 42A filling the auxiliary cooling water W2 from the bottom 32a of the fuel pool 32, and also supplies the auxiliary cooling water W2 around the plurality of nuclear fuels 38 from the plurality of holes 48A. Can be supplied. Therefore, the fuel storage facility 31 </ b> A according to the second embodiment can more suitably suppress the supply of the auxiliary cooling water W <b> 2 from becoming uneven with respect to the nuclear fuel 38 disposed in the fuel storage region 33.

(Third embodiment)
Next, a third embodiment will be described. The fuel storage facility 31B according to the third embodiment is different from the first embodiment in that it includes an auxiliary cooling water pipe section 40B. The description of the same configuration as that of the first embodiment of the fuel storage facility 31B according to the third embodiment will be omitted.

  FIG. 7A is a diagram schematically illustrating the configuration of the fuel storage facility according to the third embodiment. FIG. 7B is a top view of the fuel pool according to the third embodiment as viewed from above. As shown in FIG. 7A, the fuel storage facility 31B according to the third embodiment has an auxiliary cooling water pipe section 40B. The auxiliary cooling water pipe section 40 </ b> B constitutes an auxiliary cooling water supply section that supplies the auxiliary cooling water W <b> 2 to the entire fuel storage region 33. The auxiliary cooling water pipe section 40B is a pipe line that is provided below the ground surface Gr in the vertical direction X, that is, underground, and supplies the auxiliary cooling water W2. The auxiliary cooling water pipe portion 40B has a supply port portion 42B that is one end portion that opens and a water injection port portion 44B that is the other end portion that opens.

  In the auxiliary cooling water pipe portion 40B, the water injection port portion 44B is provided outside the fuel storage building 30 and on the ground surface Gr. The water injection port portion 44B is provided above the supply port portion 42B in the vertical direction X. The water injection port 44B has a connection mechanism that can be connected to the supply mechanism of the auxiliary cooling water W2 outside the fuel storage building 30. The water injection port portion 44B has a connection mechanism that can be connected to the supply mechanism of the auxiliary cooling water W2 outside the fuel storage building 30, and can be connected to the auxiliary cooling water injection portion 100 or the high place water injection portion 110.

  As shown in FIGS. 7A and 7B, the auxiliary cooling water pipe section 40 </ b> B has a supply port section 42 </ b> B that branches into a plurality, and the plurality of supply port sections 42 </ b> B open to the bottom 32 a of the fuel pool 32. More specifically, the plurality of supply ports 42 </ b> B are at the bottom 32 a of the fuel pool 32 and open to the inside of the fuel storage region 33. The supply port portion 42B is provided around each fuel rack 36, that is, around the plurality of nuclear fuels 38, and below in the vertical direction X. However, the number and position of the supply ports 42B are arbitrary as long as they are provided at the bottom 32a of the fuel pool 32. For example, the number of the supply ports 42B may be one. As shown in FIG. 7A, when the supply port portion 42B is provided below the fuel rack 36, the fuel rack 36 is disposed on the bottom portion 32a of the fuel pool 32 by the foot portion 36a. The portion 36a may not be provided.

  As in the case of the auxiliary cooling water pipe portion 40 according to the first embodiment, the auxiliary cooling water pipe portion 40B is provided with the auxiliary cooling water W2 from the water injection port portion 44B by the auxiliary cooling water injection portion 100 or the high place water injection portion 110 in an emergency. , And the auxiliary cooling water W2 can be supplied into the fuel pool 32 from the supply port 42.

  As described above, in the fuel storage facility 31B according to the third embodiment, the auxiliary cooling water pipe section 40B serving as the auxiliary cooling water supply section is provided, and the supply opening 42B that is one opening is provided at the bottom 32a of the fuel pool 32. This is a pipe line that is open and has a water inlet 44 </ b> B that is the other opening that opens to the outside of the fuel storage building 30. The auxiliary cooling water pipe portion 40B can supply the auxiliary cooling water W2 into the fuel pool 32 by supplying the auxiliary cooling water W2 from the water injection port portion 44B. In the auxiliary cooling water pipe portion 40B in the third embodiment, the supply port portion 42B opens to the bottom portion 32a of the fuel pool 32. Therefore, the auxiliary cooling water pipe section 40 </ b> B can fill the auxiliary cooling water W <b> 2 from the bottom portion 32 a of the fuel pool 32. Therefore, the auxiliary cooling water pipe section 40B can suitably suppress the supply of the auxiliary cooling water W2 from becoming uneven with respect to the nuclear fuel 38 disposed in the fuel storage region 33. Furthermore, since the auxiliary cooling water pipe section 40B has a plurality of supply ports 42B, the supply of the auxiliary cooling water W2 to the nuclear fuel 38 arranged in the fuel storage region 33 is more uneven. It can suppress suitably.

(Modification 1)
Next, Modification 1 which is a modification of the first embodiment will be described. The modification 1 is different from the first embodiment in that the fuel storage facility 31 includes a heat exchanger 50 and a heat exchange pipe 58. Since other points are common to the first embodiment, description thereof is omitted.

  FIG. 8A is a diagram schematically illustrating the configuration of the fuel storage facility according to the first modification. As shown in FIG. 8A, in the first modification, the fuel storage facility 31 has a heat exchanger 50 above the fuel pool 32 and inside the fuel storage building 30. The heat exchanger 50 includes headers 51 and 52, a plurality of heat transfer tubes 54, and a blower 56. The headers 51 and 52 are containers in which heat exchange water that is water for heat exchange is stored. The headers 51 and 52 are provided outside the fuel storage facility 31. The heat transfer tube 54 is a tube that connects the header 51 and the header 52, and heat exchange water is conducted inside. The heat transfer tube 54 is provided inside the fuel storage facility 31 and above the fuel pool 32 in the vertical direction X. The blower 56 is a blower that sends an air flow to the header 51.

  In an emergency, the cooling water W1 in the fuel pool 32 and the auxiliary cooling water W2 supplied to the fuel pool 32 evaporate due to the decay heat of the nuclear fuel 38 and generate steam V above the fuel pool 32. There is. In the first modification, a heat transfer tube 54 that conducts heat exchange water is disposed above the fuel pool 32. Accordingly, the steam V is condensed by exchanging heat with the heat exchange water in the heat transfer pipe 54 and dropped into the lower fuel pool 32 as condensed water W3. The condensed water W <b> 3 can cool the nuclear fuel 38 in the fuel pool 32. In addition, the heat exchange water heat-exchanged with the vapor | steam V becomes vapor | steam, moves to the header 51, is cooled and condensed with the external air and the airflow from the air blower 56 in the header 51, and is again conducted by the heat exchanger tube 54. In addition, if the heat exchanger 50 condenses the vapor | steam V with heat exchange water, it will not be restricted to the structure demonstrated above. For example, in the heat exchanger 50, a part of the heat transfer tube 54 may be disposed outside the fuel storage facility 31. In this case, the heat transfer tube 54 outside the fuel storage facility 31 can also be cooled by outside air. Moreover, the heat exchanger 50 does not have the air blower 56, and may cool heat exchange water only with external air. In this case, the heat exchanger 50 does not require a power source.

  As shown in FIG. 8A, in the first modification, the fuel storage facility 31 has a heat exchange pipe 58. One end of the heat exchange pipe 58 is open in the fuel storage facility 31 and above the fuel pool 32 in the vertical direction X, and the other end is connected to the high water injection section 110 and opened. It is a pipe. In the heat exchange pipe 58, the steam V is introduced from one end, and the steam V is led into the high-place water injection section 110 from the other end. The steam V is cooled and condensed by the water in the high place water injection section 110. The condensed water is sent to the auxiliary cooling water piping section 40 via the high-place water injection piping 112 and cools the nuclear fuel 38 again as the auxiliary cooling water W2.

  As described above, the fuel storage facility 31 according to the modification 1 is the cooling water W1 or auxiliary cooling that has become the vapor V due to the decay heat of the nuclear fuel 38 in the fuel storage facility 31 above the fuel pool 32 in the vertical direction X. The heat exchanger 50 that cools the water W2 to generate condensed water W3 and drops the condensed water W3 into the fuel pool 32 is provided. In addition, the fuel storage facility 31 in the first modification has one end portion in the fuel storage facility 31 that is open upward in the vertical direction X from the fuel pool 32, and the other end portion is a high water injection portion. A heat exchange pipe 58 that is an open pipe connected to 110 is provided. The fuel storage facility 31 in the first modification can cool the nuclear fuel 38 again with the condensed water W3 obtained by condensing the steam V by the heat exchanger 50 and the heat exchange pipe 58. Therefore, the fuel storage facility 31 in the first modification can cool the nuclear fuel 38 more appropriately in an emergency. In addition, although the fuel storage facility 31 in the first modification includes both the heat exchanger 50 and the heat exchange pipe 58, only one of them may be included.

  The first modification can also be applied to the fuel storage facility 31A according to the second embodiment and the fuel storage facility 31B according to the third embodiment. 8B and 8C are diagrams schematically illustrating the configuration of another example of the fuel storage facility according to the first modification. FIG. 8B shows a configuration in which the first modification is applied to the fuel storage facility 31 </ b> A according to the second embodiment, and the fuel storage facility 31 </ b> A includes a heat exchanger 50 and a heat exchange pipe 58. FIG. 8C shows a configuration in which the first modification is applied to the fuel storage facility 31 </ b> B according to the third embodiment, and the fuel storage facility 31 </ b> B has a heat exchanger 50 and a heat exchange pipe 58.

(Fourth embodiment)
Next, a fourth embodiment will be described. The fuel storage facility 31 </ b> C according to the fourth embodiment is different from the first embodiment in that it includes a water tank unit 60. The description of the same configuration as that of the first embodiment of the fuel storage facility 31C according to the fourth embodiment will be omitted.

  FIG. 9 is a diagram schematically illustrating the configuration of the fuel storage facility according to the fourth embodiment. FIG. 10 is a top view of the water tank unit according to the fourth embodiment as viewed from above. The fuel storage facility 31 </ b> C according to the fourth embodiment includes an auxiliary cooling water piping unit 40 </ b> C and a water tank unit 60.

  The water tank unit 60 constitutes an auxiliary cooling water supply unit that supplies the auxiliary cooling water W <b> 2 to the entire fuel storage region 33. As shown in FIG. 9, the water tank 60 is a container provided in the upper part of the fuel pool 32 in the vertical direction X inside the fuel storage building 30. Although the water tank part 60 is being fixed to the ceiling part of the fuel storage building 30, if it is provided in the upper part of the fuel pool 32, the fixing method is not restricted to this. The water tank portion 60 has a bottom surface portion 62 that is a bottom surface, and four wall surfaces 63a, 63b, 63c, and 63d extending from the bottom surface portion 62, and an upper portion is open.

  As shown in FIGS. 9 and 10, in the water tank unit 60, the bottom surface unit 62 covers the upper part of the fuel storage region 33 in the vertical direction X. Moreover, although mentioned later in detail, the water tank part 60 inclines toward the downward direction in the perpendicular direction X along the direction Y which is the direction where the bottom face part 62 leaves | separates from 40 C of auxiliary cooling water piping parts.

  The water tank portion 60 has a plurality of holes 64 that are open in the bottom surface portion 62. As shown in FIG. 10, the plurality of holes 64 are provided at predetermined intervals over the entire region 33 </ b> C, which is an upper region in the vertical direction X of the fuel storage region 33. The plurality of holes 64 are also provided around the region 33C. More specifically, the region 33C is a region obtained by projecting the fuel storage region 33 upward in the vertical direction X. As long as the plurality of hole portions 64 are provided in the entire region 33C at a predetermined interval, the shape and number of the holes are arbitrary, and the interval between the hole portions 64 may be different from each other. However, the plurality of holes 64 are preferably smaller in diameter than the pipe diameter of an auxiliary cooling water pipe section 40C described later, and are preferably provided at equal intervals over the entire area 33C. Moreover, although the hole part 64 is provided perpendicularly | vertically with respect to the bottom face part 62, you may open in the direction along the vertical direction X, for example. The water tank 60 is supplied with auxiliary cooling water W2 and drops the auxiliary cooling water W2 from the plurality of holes 64 onto the nuclear fuel 38 in the fuel storage region 33.

  The auxiliary cooling water pipe section 40C constitutes an auxiliary cooling water supply section that supplies the auxiliary cooling water W2 to the entire fuel storage area 33, and more specifically, a water tank auxiliary cooling water that supplies the auxiliary cooling water W2 to the water tank section 60. The supply unit is configured. As shown in FIG. 9, the auxiliary cooling water piping portion 40 </ b> C is a pipe having a supply port portion 42 </ b> C that is one end portion that opens and a water injection port portion 44 that is the other end portion that opens. The supply port portion 42C is an opening portion for supplying the auxiliary cooling water W2 into the water tank portion 60, and the water injection port portion 44 is an opening portion for pouring the auxiliary cooling water W2 into the auxiliary cooling water pipe portion 40. is there.

  In the auxiliary cooling water piping part 40 </ b> C, the water injection port part 44 is provided outside the fuel storage building 30. The auxiliary cooling water piping section 40 </ b> C extends into the fuel storage building 30 from the water injection port 44 toward the supply port 42. The auxiliary cooling water piping section 40C has the same structure as the auxiliary cooling water piping section 40 according to the first embodiment in the structure outside the fuel storage building 30 such as the water injection port 44.

  In the auxiliary cooling water piping section 40C, the supply port section 42C is located inside the fuel storage building 30 and in the water tank section 60. More specifically, the supply port portion 42 </ b> C is located on the wall surface 63 a side on the auxiliary cooling water piping portion 40 </ b> C side in the water tank portion 60 and opens toward the bottom surface portion 62. The water tank portion 60 is inclined downward in the vertical direction X as the bottom surface portion 62 moves away from the supply port portion 42C (along the direction from the wall surface 63a to the opposing wall surface 63c). The supply port portion 42 </ b> C is arbitrary as long as it is located inside the fuel storage building 30 and can supply the auxiliary cooling water W <b> 2 into the water tank portion 60. For example, the supply port part 42 </ b> C may be provided outside the water tank part 60.

  As in the case of the auxiliary cooling water piping unit 40 according to the first embodiment, the auxiliary cooling water piping unit 40C is provided with the auxiliary cooling water W2 from the water injection port 44 by the auxiliary cooling water injection unit 100 or the high place water injection unit 110 in an emergency. And the auxiliary cooling water W2 can be supplied into the fuel pool 32 from the supply port portion 42C. As shown in FIG. 9, the auxiliary cooling water piping section 40 </ b> C has the water injection port 44 positioned vertically below the supply port 42 </ b> C, but is not limited thereto, and the water injection port 44 is positioned at the supply port. It may be located vertically above 42C. In this case, the auxiliary cooling water piping section 40C can supply the auxiliary cooling water W2 using the water head.

  As described above, the fuel storage facility 31 </ b> C according to the fourth embodiment includes the water tank unit 60 that is disposed at the top of the fuel pool 32 and is supplied with the auxiliary cooling water W <b> 2 therein. The water tank unit 60 includes a bottom surface part 62 that covers the upper part of the fuel storage region 33 and a plurality of holes 64 provided in the bottom surface part 62. The water tank unit 60 drops the auxiliary cooling water W <b> 2 supplied therein to the nuclear fuel 38 in the fuel storage region 33 from the plurality of holes 64. In this water tank 60, the bottom surface portion 62 covers the upper portion of the fuel storage region 33, and the auxiliary cooling water W <b> 2 is dropped from a plurality of holes 64 provided in the bottom surface portion 62. Therefore, the water tank unit 60 can drop the auxiliary cooling water W2 over the entire fuel storage region 33 spreading in a plane. Therefore, the fuel storage facility 31 </ b> C can suitably suppress the supply of the auxiliary cooling water W <b> 2 from becoming uneven for each nuclear fuel 38 arranged in the fuel storage region 33. Moreover, the water tank part 60 can be easily attached to the existing fuel storage equipment which does not have such a water tank.

  The plurality of holes 64 are provided at predetermined intervals over the entire region 33 </ b> C, which is the region above the fuel storage region 33. Therefore, the water tank 60 can drop the auxiliary cooling water W2 more suitably over the entire fuel storage region 33. Therefore, the fuel storage facility 31 </ b> C can more suitably suppress the supply of the auxiliary cooling water W <b> 2 from becoming uneven with respect to each nuclear fuel 38 disposed in the fuel storage region 33.

  Furthermore, the fuel storage facility 31 </ b> C according to the fourth embodiment includes an auxiliary cooling water pipe part 40 </ b> C as a water tank auxiliary cooling water supply part that supplies the auxiliary cooling water W <b> 2 to the water tank part 60. Therefore, the fuel storage facility 31 </ b> C can reliably supply the auxiliary cooling water W <b> 2 to the water tank unit 60. However, the fuel storage facility 31 </ b> C may not have the water tank auxiliary cooling water supply unit as long as it has the water tank unit 60. Even in such a case, the fuel storage facility 31 </ b> C can supply the auxiliary cooling water W <b> 2 directly to the water tank unit 60 by a fire hose of the auxiliary cooling water injection unit 100 that is a fire truck, for example. For example, the auxiliary cooling water injection unit 100 may supply the auxiliary cooling water W2 directly to the water tank unit 60 through a window or a door provided in the fuel storage facility 31C.

  Moreover, the bottom face part 62 inclines toward the downward direction in the vertical direction X as the water tank part 60 leaves | separates from 40C of auxiliary cooling water piping parts as a water tank auxiliary cooling water supply part. In other words, the water tank unit 60 is inclined downward in the vertical direction X as the distance from the location where the auxiliary cooling water W2 is supplied (along the direction Y). Therefore, in the water tank unit 60, the auxiliary cooling water W2 is easily guided to a place away from the place where the auxiliary cooling water W2 in the water tank part 60 is supplied, and the auxiliary cooling water W2 dripped from the plurality of holes 64 is provided. To prevent the amount of water from becoming uneven. Therefore, the fuel storage facility 31C can more suitably suppress the supply of the auxiliary cooling water W2 to the nuclear fuel 38 from becoming uneven.

  Further, the auxiliary cooling water pipe section 40C as the water tank auxiliary cooling water supply section has a supply port portion 42C as one end portion provided in the fuel storage building 30 and a water injection port portion 44 as the other end portion. It is a pipe provided outside the fuel storage building 30. The auxiliary cooling water pipe portion 40 </ b> C can supply the auxiliary cooling water W <b> 2 to the water tank portion 60 when the auxiliary cooling water W <b> 2 is supplied from the water injection port portion 44. Therefore, the fuel storage facility 31C can supply the auxiliary cooling water W2 to the water tank unit 60 safely and reliably even in an emergency.

  In addition, the water tank part 60 is not restricted to what was demonstrated above. FIG. 11 is a schematic diagram showing a configuration of a water tank unit of another example. FIG. 12 is a top view of another example of the water tank portion as viewed from above. As shown in FIG.11 and FIG.12, the water tank part 60 may have the inner wall part 66 inside, for example. The inner wall portion 66 is a wall extending in the direction Z that is a direction from the wall surface 63b toward the wall surface 63d, and is provided between the wall surface 63a and the wall surface 63c. The direction Z is a direction that intersects the direction Y. The inner wall portion 66 is provided between the side of the region 33C on the wall surface 63a side and the wall surface 63a. More specifically, the inner wall portion 66 is provided between the side on the wall surface 63a side of the region 33C and the supply port portion 42C of the auxiliary cooling water piping portion 40C. Further, the inner wall portion 66 is lower in height than the wall surfaces 63a, 63b, 63c, 63d.

  The inner wall portion 66 forms a sub chamber portion 67 on the inner side together with the wall surfaces 63a, 63b, 63d. The inner wall portion 66 forms a supply chamber portion 68 on the inner side together with the wall surfaces 63b, 63c, and 63d. The sub chamber portion 67 is a room constituting a part of the inside of the water tank portion 60 and is provided outside the region 33C. Inside the sub chamber portion 67, a supply port portion 42C of the auxiliary cooling water piping portion 40C is disposed. Further, the sub chamber portion 67 is not provided with the hole 64. The supply chamber portion 68 is a room constituting another part of the inside of the water tank portion 60, and is provided inside the region 33C. The supply chamber 68 is provided with a plurality of holes 64.

  When the water tank unit 60 includes the sub chamber unit 67 and the supply chamber unit 68, the auxiliary cooling water W <b> 2 discharged from the supply port unit 42 </ b> C is first filled in the sub chamber unit 67. When the water level becomes higher than the inner wall portion 66, the auxiliary cooling water W <b> 2 filled in the sub chamber portion 67 flows into the supply chamber portion 68 beyond the inner wall portion 66. The auxiliary cooling water W <b> 2 that has flowed into the supply chamber 68 is dripped into the fuel pool 32 through the hole 64.

  The water tank 60 stores the auxiliary cooling water W2 in a predetermined amount in the sub chamber 67 and then supplies the auxiliary cooling water W2 to the supply chamber 68 through the inner wall 66. Here, the inner wall portion 66 is a wall extending in the direction Z. Therefore, the auxiliary cooling water W <b> 2 that flows into the supply chamber 68 through the inner wall 66 has a uniform amount of water along the direction Z. Therefore, when the water tank part 60 has the sub chamber part 67, the auxiliary cooling water W <b> 2 can be introduced evenly along the direction Z in addition to the direction Y. Further, the water tank unit 60 may have a lid part that can open and close the openings of the plurality of hole parts 64 instead of the sub chamber part 67. In this case, the hole portion 64 is initially closed by the lid portion, a predetermined amount of auxiliary cooling water W2 is stored in the water tank portion 60, and then the hole portion 64 is opened by the lid portion, and the auxiliary cooling water is stored in the fuel pool 32. W2 may be dropped.

(Modification 2)
Next, Modification 2 which is a modification of the fourth embodiment will be described. The modification 2 is different from the fourth embodiment in that the fuel storage facility 31C includes a heat exchanger 50 and a heat exchange pipe 58. FIG. 13 is a diagram schematically illustrating the configuration of the fuel storage facility according to the second modification. As illustrated in FIG. 13, in the second modification, the fuel storage facility 31 </ b> C includes the heat exchanger 50 and the heat exchange pipe 58 similar to those in the first modification. That is, in the second modification, the first modification is applied to the fuel storage facility 31C according to the fourth embodiment. However, in the modification 2, the heat exchanger 50 is provided in the upper part of the water tank part 60 in the vertical direction X. The heat exchanger 50 cools the cooling water W <b> 1 or the auxiliary cooling water W <b> 2 that has become steam V due to the decay heat of the nuclear fuel 38 to generate condensed water W <b> 3, and drops the condensed water W <b> 3 into the water tank unit 60. That is, the heat exchanger 50 according to Modification 2 drops the condensed water W <b> 3 into the fuel pool 32 via the water tank unit 60.

  As mentioned above, although embodiment of this invention was described, embodiment is not limited by the content of this embodiment. In addition, the above-described constituent elements include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, various omissions, substitutions, or changes of the components can be made without departing from the spirit of the above-described embodiment.

DESCRIPTION OF SYMBOLS 11 Reactor containment vessel 12 Pressurized water reactor 13 Steam generator 14, 15 Cooling water piping 16 Pressurizer 17 Cooling water pump 18 Turbine 19 Condenser 20, 21 Cooling water piping 22 Water supply pump 23 Generator 24 Intake pipe 25 Drainage Pipe 30 Fuel storage building 31, 31A, 31B, 31C Fuel storage facility 32 Fuel pool 32a Bottom 32b Wall surface 33 Fuel storage area 33C area 34 Cooling water supply part 35 Piping 36 Fuel rack 36a Leg part 37 Cell storage part 38 Nuclear fuel 38a Top part 38b Lower end part 40, 40A, 40C Auxiliary cooling water pipe part 40B Auxiliary cooling water pipe part 42, 42A, 42B, 42C Supply port part 44, 44B Water injection part 45 Valve 46, 46A Intermediate part 47A Front pipe part 48A Hole part 50 Heat exchanger 51, 52 Header 54 Heat transfer tube 56 Blower 58 Heat Replacement pipe 60 Water tank part 62 Bottom face part 63a, 63b, 63c, 63d Wall surface 64 Hole part 66 Inner wall part 67 Sub chamber part 68 Supply chamber part 100 Auxiliary cooling water injection part 110 High place water injection part 112 High place water injection part piping Gr Ground surface S Distance V Steam W1 Cooling water W2 Auxiliary cooling water W3 Condensed water X Vertical direction Y, Z direction

Claims (13)

A fuel pool capable of storing a plurality of nuclear fuels immersed in cooling water stored therein;
A fuel storage facility, comprising: an auxiliary cooling water supply unit that supplies auxiliary cooling water to an entire fuel storage region that is a region in which the plurality of nuclear fuels are stored in the fuel pool. The auxiliary cooling water supply unit has a supply port that is an opening for supplying the auxiliary cooling water into the fuel pool,
2. The fuel storage facility according to claim 1, wherein the supply port portion is provided in the fuel pool and below the upper ends in the vertical direction of the plurality of nuclear fuels. The fuel pool is provided inside the fuel storage building,
The auxiliary cooling water supply section includes an auxiliary cooling water piping section in which one end portion is the supply port portion and a water injection port portion which is the other end portion is a pipe provided outside the fuel storage building. Have
3. The fuel storage facility according to claim 2, wherein the auxiliary cooling water pipe unit is capable of supplying the auxiliary cooling water into the fuel pool by being supplied with the auxiliary cooling water from the water injection port. The fuel pool is provided inside the fuel storage building,
The auxiliary cooling water supply section has a pipe in which the supply port portion which is one opening portion opens to the bottom of the fuel pool and the water injection port portion which is the other opening portion opens to the outside of the fuel storage building. Having an auxiliary cooling water pipe section that is a road,
The fuel storage facility according to claim 2, wherein the auxiliary cooling water pipe part is capable of supplying the auxiliary cooling water into the fuel pool when the auxiliary cooling water is supplied from the water injection port part.   The fuel storage facility according to claim 3 or 4, wherein the water injection port is provided vertically above the supply port.   The auxiliary cooling water piping section is directed downward in the vertical direction while circling around the plurality of the nuclear fuels from an intermediate portion that is a portion between the water injection port portion and the supply port portion to the supply port portion. 4. The fuel storage according to claim 3, wherein the fuel storage has a plurality of holes that are extended and are holes for dripping the auxiliary cooling water into the fuel pool between the intermediate part and the supply port part. 5. Facility. The auxiliary cooling water supply unit has a water tank unit that is disposed at an upper portion of the fuel pool and into which auxiliary cooling water is supplied.
The water tank portion has a bottom surface portion that covers an upper portion of the fuel storage region, and a plurality of holes provided in the bottom surface portion, and drops auxiliary cooling water to the plurality of nuclear fuels from the plurality of holes. The fuel storage facility according to claim 1.   The fuel storage facility according to claim 7, wherein the plurality of holes are provided at a predetermined interval over the entire region of the upper portion of the fuel storage region.   The fuel storage facility according to claim 7 or 8, wherein the auxiliary cooling water supply unit includes a water tank auxiliary cooling water supply unit that supplies the auxiliary cooling water to the water tank unit.   The fuel storage facility according to claim 9, wherein the bottom portion of the water tank portion is inclined downward in the vertical direction as the water tank portion moves away from the water tank auxiliary cooling water supply unit. The fuel pool and the water tank are provided inside the fuel storage building,
The water tank auxiliary cooling water supply unit has a supply port portion that is one end portion provided inside the fuel storage building, and a water injection port portion that is the other end portion is provided outside the fuel storage building. Having an auxiliary cooling water pipe that is a pipe,
The fuel storage according to claim 9 or 10, wherein the auxiliary cooling water pipe part is capable of supplying the auxiliary cooling water to the water tank part by being supplied with the auxiliary cooling water from the water injection port part. Facility.   The fuel storage facility according to claim 11, wherein the water injection port portion is provided vertically above the supply port portion.   A heat exchanger that cools the cooling water or the auxiliary cooling water that has become steam due to the heat of the nuclear fuel to generate condensed water at the top of the fuel pool, and drops the condensed water into the fuel pool. The fuel storage facility according to any one of claims 1 to 12.

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