JP2012233700A - Method for cooling reactor containment vessel and apparatus for cooling reactor containment vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for cooling a reactor containment vessel capable of cooling the outer surface of the reactor containment vessel and reusing cooling water used for the cooling.SOLUTION: A reactor containment vessel 6 has: a dry-well vessel 44 forming a dry well 43 in which a reactor pressure vessel 2 is disposed; a plurality of exhaust pipes 9 that are connected to the dry-well vessel 44 and in communication with the dry well 43; and an annular pressure suppression chamber 8 into which each exhaust pipe 9 is inserted, and which surrounds the bottom of the dry-well vessel 44 and forms a pressure suppression pool 11. Cooling water is supplied into an annular gap 26 formed between a biological shield wall 16 and the dry-well vessel 44 surrounding the dry-well vessel 44. The cooling water that has dropped into the gap 26 while cooling the dry-well vessel 44 is collected into an annular chamber for installing a pressure suppression chamber 28 in which a pressure suppression chamber 8 is installed. The cooling water collected in the chamber for installing a pressure suppression chamber 28 is supplied into the gap 26, and the cooling water is reused for cooling of the dry-well vessel 44.

Description

  The present invention relates to a reactor containment vessel cooling method and a reactor containment vessel cooling apparatus, and more particularly to a reactor containment vessel cooling method and a reactor containment vessel cooling apparatus suitable for application to a boiling water reactor. .

  In a boiling water reactor, a nuclear reactor containing a core loaded with a plurality of fuel assemblies is arranged in a reactor containment vessel that is a sealed vessel. The reactor containment vessel is arranged in the reactor building. In this way, the nuclear reactor is surrounded by the reactor containment vessel and the reactor building, and in the unlikely event that radioactive material leaks from inside the reactor, this radioactive material is prevented from leaking to the outside environment. .

  For example, a loss of coolant accident (LOCA) occurs, and high-temperature and high-pressure cooling water in the nuclear reactor becomes steam from a breakage point of a pipe (for example, main steam pipe) connected to the nuclear reactor. Spouts into the dry well. At this time, an example of cooling the reactor containment vessel in which the temperature rises is described in JP-A-6-59073.

  In cooling the containment vessel of a boiling water reactor described in JP-A-6-59073, a plurality of annular passages formed by cylindrical first and second enclosures installed in the reactor building Cooling air is flowing inside. A first enclosure (made of concrete) surrounds the reactor containment vessel, and an annular first cooling air flow path is formed between the outer surface of the reactor containment vessel and the inner surface of the first enclosure. A second enclosure surrounds the first enclosure, and an annular second cooling air flow path is formed between the outer surface of the first enclosure and the inner surface of the second enclosure. The upper end of the first cooling air channel is connected to the air outlet provided on the roof of the reactor building, and the upper end of the second cooling air channel is connected to the air inlet provided on the roof of the reactor building. Is done. The first cooling air flow path and the second cooling air flow path are in communication with each other at their lower ends.

  When LOCA occurs, the reactor containment vessel is heated by the steam released to the dry well in the reactor containment vessel, and the air in the first cooling air flow path is heated by the heat of the reactor containment vessel and rises. This air is exhausted to the external environment from the air outlet provided on the roof of the reactor building. When air rises in the first cooling air flow path, external low-temperature air (cooling air) flows into the second cooling air flow path from the air inlet provided on the roof of the reactor building. The second cooling air flow path descends and then flows into the first cooling air flow path at the lower end of the second cooling air flow path. This low temperature air cools the reactor containment vessel as it rises in the first cooling air flow path.

  As for the reactor containment vessel of the pressurized water reactor, it has been proposed to cool the outer surface of the reactor containment vessel with air (see JP-A-2-296196 and JP-A-5-87967). In both cases, an annular second cooling air flow path for lowering the cooling air and an annular first cooling air flow for raising the cooling air are provided between the reactor containment vessel and the shielding building containing the reactor containment vessel. Forming a road. The first cooling air channel is in contact with the outer surface of the reactor containment vessel, and the second cooling air channel surrounds the first cooling air channel. Cooling air descending in the second cooling air channel flows into the first cooling air channel at the lower end of the second cooling air channel, and cools the reactor containment vessel while passing through the first cooling air channel. It rises and is exhausted to the outside environment.

  In Japanese Patent Application Laid-Open No. 2-296196, a water supply device that discharges water from a water supply source toward the outer surface of the top of the reactor containment vessel above the reactor containment vessel at the outlet of the first cooling air flow path. Is provided.

JP-A-6-59073 JP-A-2-296196 JP-A-5-87967

  The cooling of the reactor containment vessel described in JP-A-6-59073, JP-A-2-296196, and JP-A-5-87967 is mainly based on air cooling using cooling air. For this reason, the second cooling air flow is communicated to the outside of the reactor containment vessel, the second cooling air flow path for lowering the cooling air in the axial direction of the reactor containment vessel, and the lower end of the second cooling air flow path. A first cooling air flow path for raising the cooling air supplied from the passage is formed, the first cooling air flow path is brought into contact with the outer surface of the reactor containment vessel, and the cooling air rising in the first cooling air flow path is The reactor containment is being cooled.

  However, the cooling efficiency of the reactor containment vessel is higher with water cooling than with air cooling. In Japanese Patent Laid-Open No. 2-296196, a water supply device that discharges water from a water supply source is provided near the top of the reactor containment vessel at the outlet of the first cooling air flow path to cool the reactor containment vessel with water. It is described. The water discharged from the water supply device toward the top of the reactor containment vessel is evaporated by the heat of the reactor containment vessel. If the water discharged from the water supply device toward the top of the reactor containment vessel falls along the outer surface of the reactor containment vessel in the first cooling air passage, the water is discharged to the lower end of the first cooling air passage. In the case of accumulation, the accumulated water hinders the inflow of cooling air from the second cooling air flow path to the first cooling air flow path.

  An object of the present invention is to provide a reactor containment vessel cooling method and a reactor containment vessel cooling apparatus capable of cooling the outer surface of a reactor containment vessel with water and reusing the cooling water used for this cooling. There is.

A feature of the present invention that achieves the above-described object is that a dry well container in which a dry well in which a reactor pressure vessel is disposed is formed, a plurality of discharge pipes connected to the dry well container and connected to the dry well, And a method for cooling a reactor containment vessel having an annular pressure suppression chamber in which each discharge pipe is inserted to surround the bottom of the dry well container and a pressure suppression pool is formed therein,
Supplying cooling water into the annular first gap formed between the biological shielding wall that is part of the reactor building surrounding the dry well container and the dry well container;
The bottom part of the dry well container in which the annular pressure suppression chamber is installed through the annular second gap formed around the discharge pipe through which the cooling water falling in the first gap while cooling the dry well container Is recovered in the annular pressure suppression chamber installation room
The cooling water collected in the pressure suppression chamber installation chamber is supplied into the first gap.

  Cooling water is supplied into an annular first gap formed between the biological shielding wall that surrounds the dry well container and is a part of the reactor building and the dry well container, and the first well is cooled while cooling the dry well container. The cooling water falling in the gap is collected in the pressure suppression chamber installation chamber, so that the outer surface of the dry well container can be cooled, and the cooling water used for this cooling is easily collected in the pressure suppression chamber installation chamber. Therefore, the recovered cooling water can be reused for cooling the dry well container. Further, the pressure suppression chamber installed in the pressure suppression chamber installation chamber can be cooled with the cooling water collected in the pressure suppression chamber installation chamber.

  According to the present invention, it is possible to cool the outer surface of the dry well container that houses the reactor pressure vessel, and to reuse the cooling water collected in the pressure suppression chamber installation chamber for cooling the dry well container. it can. Furthermore, the pressure suppression chamber installed in the pressure suppression chamber installation chamber can be cooled with the cooling water collected in the pressure suppression chamber installation chamber.

It is a block diagram of the reactor containment vessel cooling device arranged in the reactor building, which is a preferred embodiment of the present invention. It is an enlarged view of the II section of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1.

  Examples of the present invention will be described below.

  A reactor containment vessel cooling method according to a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3.

  The schematic structure of the boiling water reactor to which the reactor containment vessel cooling method of the present embodiment is applied, and the schematic structure of the reactor building 13 in which the reactor containment vessel cooling device 31 is arranged are shown in FIG. explain.

  The nuclear reactor 1 includes a nuclear reactor pressure vessel 2 and a core 4 disposed in the nuclear reactor pressure vessel 2. A plurality of fuel assemblies (not shown) are loaded on the core 4. An upper lid 3 is detachably attached to the flange of the reactor pressure vessel 2. The steel reactor containment vessel 6 surrounding the reactor pressure vessel 2 has a dry well vessel 44 in which a dry well 43 is formed, and a pressure suppression chamber 8. The nuclear reactor pressure vessel 2 is disposed in the dry well 43 and is installed on a cylindrical pedestal 12 installed in the dry well 43. An upper lid 7 is also detachably attached to the upper end of the reactor containment vessel 6. A ring-shaped pressure suppression chamber 8 surrounds the bottom of the dry well container 44. A plurality of discharge pipes 9 connected in the vicinity of the bottom of the dry well container 44 and arranged radially pass through the pressure suppression chamber 8 and reach the pressure suppression chamber 8. A pressure suppression pool 11 filled with cooling water is formed in the pressure suppression chamber 8. The plurality of downcomers 10 are connected to the discharge pipes 9, and the lower parts of these downcomers 10 are immersed in the cooling water of the pressure suppression pool 11. The reactor containment vessel 6 is installed on the concrete mat 30 in the reactor building 13.

  In the reactor building 13, an annular pressure suppression chamber installation chamber 28 is formed on the lowest floor (basement). The pressure suppression chamber 8 is disposed in the pressure suppression chamber installation chamber 28. A biological shielding wall 16 that is a part of the reactor building 13 surrounds the dry well container 44. A reactor well 14 is formed in the reactor building 13 directly above the reactor pressure vessel 2. During operation of the reactor, the cooling water is not filled in the reactor well 14, and the upper lids 3 and 7 are disposed in the reactor well 14. The shielding lid 15 is installed at the upper end of the reactor well 14 so as to cover the upper lid 7 during the operation of the reactor, and the reactor well 14 is released to release the reactor well 14 during the periodic inspection period of the reactor. 14 is removed from the upper end.

  When the periodic inspection of the reactor is performed after the operation of the reactor is stopped, the upper lids 3 and 7 are removed from the reactor pressure vessel 2 and the containment vessel 6, and the reactor well 14 is filled with cooling water. . In order to prevent this cooling water from falling between the reactor pressure vessel 2 and the reactor containment vessel 6 and between the reactor containment vessel 6 and the biological shielding wall 16, a reactor well seal device 17 is provided. ing. The annular reactor well seal device 17 is disposed between the inner surface of the reactor well 14 and the upper end portion of the reactor containment vessel 6 and between the upper end portion of the reactor containment vessel 6 and the upper end portion of the reactor pressure vessel 2. These are sealed between them (see FIG. 2).

  The reactor well seal device 17 will be specifically described with reference to FIG. The reactor well seal device 17 includes annular seal plates 18, 19, 21 and 22 and cylindrical bellows 20 and 23. The seal plates 18 and 19 and the bellows 20 are disposed between the inner surface of the reactor well 14 and the upper end portion of the reactor containment vessel 6 and surround the reactor containment vessel 6. The seal plates 18 and 19 are disposed in a horizontal direction, the outer periphery of the seal plate 18 is attached to the inner surface of the reactor well 14, and the inner periphery of the seal plate 19 disposed below the seal plate 18 is the reactor containment vessel 6. Attached to the outer surface. The upper end of the bellows 20 is attached to the inner periphery of the seal plate 18, and the lower end of the bellows 20 is attached to the outer periphery of the seal plate 19. The seal plates 21 and 22 are disposed in the horizontal direction, the outer periphery of the seal plate 21 is attached to the inner surface of the reactor containment vessel 6, and the inner periphery of the seal plate 22 disposed below the seal plate 21 is the reactor pressure vessel 2. Attached to. The upper end of the bellows 23 is attached to the inner periphery of the seal plate 21, and the lower end of the bellows 23 is attached to the outer periphery of the seal plate 22.

  When the shielding lid 15 and the upper lids 3 and 7 are removed and the reactor well 14 is filled with cooling water during the periodic inspection of the reactor, the cooling water passes above the reactor well seal device 17. And does not fall below the reactor well seal device 17.

  An upper end surface 24 of the biological shielding wall 16 exists below the reactor well seal device 17 between the inner surface of the reactor well 14 and the reactor containment vessel 6. An annular region 25 surrounding the reactor containment vessel 6 is formed surrounded by the inner surface of the reactor well 14, the reactor well seal device 17, the outer surface of the reactor containment vessel 6, and the upper end surface 24 of the biological shielding wall 16. The

  An annular gap 26 surrounding the dry well container 44 of the reactor containment vessel 6 is formed between the inner surface of the biological shielding wall 16 and the outer surface of the dry well container 44. An annular gap 27 surrounding the discharge pipe 9 is also formed around each discharge pipe 9 with the concrete mat 30. The upper end portion of the gap 26 is connected to the region 25, and the upper end of the gap 26 is released to the region 25 over the entire circumference. The lower ends of the gaps 26 are connected to the gaps 27, and the lower ends of these gaps 27 are released to the pressure suppression chamber installation chamber 28.

  A reactor containment cooling device 31 used in the reactor containment cooling method of the present embodiment will be described with reference to FIG. The reactor containment vessel cooling device 31 includes cooling water supply pipes 32 and 37, a cooling water pump 36, on-off valves 34 and 39, a heat exchanger (cooler) 35, branch pipes 33A and 33B, a water storage tank 38, and a control device 40. And a water level gauge 41. The on-off valve 34, the heat exchanger 35, and the cooling water pump 36 are provided in the cooling water supply pipe 32 in this order from upstream to downstream. The upstream end of the cooling water supply pipe 32 is disposed between the inner surface of the pressure suppression chamber installation chamber 28 and the outer surface of the pressure suppression chamber 8 in the pressure suppression chamber installation chamber 28. The cooling water supply pipe 32 is disposed in the reactor building 13.

  A plurality of branch pipes 33 (for example, six branch pipes such as branch pipes 33 </ b> A and 33 </ b> B) are connected to the upstream end of the cooling water supply pipe 32. A plurality of openings (for example, six openings 42 </ b> A to 42 </ b> F) are formed on the upper end surface 24 of the biological shielding wall 16. (See FIG. 3). For example, the number of openings 42 formed in the upper end surface 24 of the biological shielding wall 16 may be four. Six branch pipes 33 such as the branch pipes 33 </ b> A and 33 </ b> B pass through the living body shielding wall 16 and reach the openings 42 </ b> A to 42 </ b> F formed on the upper end surface 24 of the living body shielding wall 16. An end of the branch pipe 33A is connected to an opening 42A formed on the upper end surface 24, and an end of the branch pipe 33B is connected to an opening 42D formed on the upper end surface 24. Similarly, the end portions of the remaining four branch pipes 33 are separately connected to openings 42B, 42C, 42E, and 42F formed in the upper end surface 24.

  A water storage tank 38 is installed on the ground outside the reactor building 13. One end of the cooling water supply pipe 37 provided with the on-off valve 39 is connected to the water storage tank 38, and the other end of the cooling water supply pipe 37 is connected to the cooling water supply pipe 32 between the heat exchanger 35 and the cooling water pump 36. Is done.

  A water level meter 41 is provided on the ceiling of the pressure suppression chamber installation chamber 28 and is disposed between the inner surface of the pressure suppression chamber installation chamber 28 and the outer surface of the pressure suppression chamber 8 through the ceiling. A control device 40 installed outside the reactor building 13 is connected to a water level gauge 41.

  The method for cooling the reactor containment vessel of this embodiment will be described in detail. In the boiling water reactor shown in FIG. 1, it is assumed that a coolant loss accident has occurred. The high-temperature and high-pressure cooling water in the reactor pressure vessel 2 is ejected as high-temperature steam from a broken portion of the main steam pipe connected to the reactor pressure vessel 2 in the dry well 43. The jetted high temperature steam passes through the discharge pipe 9 from the dry well 43 and is guided to the downcomer pipe 10. This steam is discharged from the downcomer pipe 10 into the cooling water of the pressure suppression pool 11 formed in the reactor containment vessel 6 and condensed. Due to the above condensation, the pressure in the reactor containment vessel decreases.

  The high-temperature steam released from the broken part of the main steam pipe fills the dry well 43 and heats the steel reactor containment vessel 6. As a result, the temperature of the reactor containment vessel 6 rises. When a coolant loss accident occurs, a signal indicating the occurrence of a coolant loss accident (for example, a signal indicating a high pressure in the dry well 43 or a signal indicating a low reactor water level) is input to the control device 40. The control device 40 opens the on-off valve 39 and closes the on-off valve 34 to drive the cooling water pump 36.

  The cooling water in the water storage tank 38 is guided into the cooling water supply pipe 32 through the cooling water supply pipe 37 and discharged from the openings 42 </ b> A to 42 </ b> F through the branch pipes 33. The water storage tank 38 is supplied with cooling water from an external water source in advance, and the water storage tank 38 is filled with cooling water. The cooling water discharged from the openings 42 </ b> A to 42 </ b> F and supplied into the region 25 is supplied from the region 25 into the annular gap 26 and falls along the outer surface of the dry well container 44. The region 25 into which the cooling water discharged from each of the openings 42A to 42F flows functions as a header that supplies the cooling water to the gap 26. For this reason, the cooling water in the region 25 is supplied into the gap 26 over the entire circumference of the reactor containment vessel 6, and the cooling water falling in the gap 26 is distributed over the entire circumference of the reactor containment vessel 6. It contacts the outer surface of the dry well container 44 and reaches the lower end of the gap 26 while cooling the outer surface. The cooling water further flows into the pressure suppression chamber installation chamber 28 while cooling the discharge pipe 27 through the gap 27. In the pressure suppression chamber installation chamber 28, the cooling water is filled in a space between the inner surface of the pressure suppression chamber installation chamber 28 and the outer surface of the pressure suppression chamber 8.

  When the cooling water level in the water storage tank 38 falls below the lower limit due to the supply of the cooling water to the region 25 and the gap 26, the cooling water is supplied into the water storage tank 38 from an external water source.

  Since the cooling water is continuously supplied from the water storage tank 38 to the region 25, the pressure in the pressure suppression chamber installation chamber 28 is reduced by the cooling water that falls in the gaps 26 and 27 and reaches the pressure suppression chamber installation chamber 28. The water level on the outside of the suppression chamber 8 rises. The water level meter 41 measures the water level and outputs a water level signal to the control device 40. When the input water level signal reaches the water level upper limit value, the control device 40 opens the open / close valve 34 and fully closes the open / close valve 39.

  Therefore, the cooling water that has flowed into the pressure suppression chamber installation chamber 28 through the gaps 26 and 27, that is, the cooling water that exists outside the pressure suppression chamber 8 in the pressure suppression chamber installation chamber 28, Then, the pressure is increased by the cooling water pump 36 and supplied into the region 25 through each branch pipe 33. The cooling water in the pressure suppression chamber installation chamber 28 is cooled by the heat exchanger 35 while flowing in the cooling water supply pipe 32, and the temperature decreases. The cooling water whose temperature has been lowered is led into the region 25 from each of the openings 42A to 42F, and flows into the gap 26 from four directions. The cooling water falls along the outer surface of the dry well container 44 and cools the dry well container 44 of the reactor containment vessel 6. Further, the cooling water flows through the gap 27 and cools the outer surface of the discharge pipe 9. Eventually, the cooling water is returned to the pressure suppression chamber installation chamber 28. The cooling water in the pressure suppression chamber installation chamber 28 continues in the reactor containment vessel 6 while circulating in the closed loop constituted by the cooling water supply pipe 32, each branch pipe 33, the region 25 and the gaps 26 and 27. Cooling. The pressure suppression chamber 8 is buried in the cooling water existing in the pressure suppression chamber installation chamber 28. For this reason, the pressure suppression chamber 8 is also cooled by the cooling water present in the pressure suppression chamber installation chamber 28, and the cooling water in the pressure suppression pool 11 whose temperature has increased by condensing the steam flowing in from the dry well 43 is also pressure. Cooled by the cooling water present in the suppression chamber installation chamber 28.

  Since the on-off valve 39 is closed while the cooling water in the pressure suppression chamber installation chamber 28 is supplied to the gap 26, the cooling water in the water storage tank 38 is not supplied to the gap 26. For some reason, when the water level measured by the water level gauge 41 becomes less than the lower limit value, the control device 40 opens the on-off valve 39 to fully close the on-off valve 34. At this time, the cooling water in the water storage tank 38 is supplied to the gap 26.

  According to the present embodiment, the cooling water in the water storage tank 38 and the cooling water in the pressure suppression chamber installation chamber 28 are supplied from the region 25 to the gaps 26 and 27, so the reactor containment vessel 6 such as a coolant loss accident or the like. In the event of an accident in which the temperature of the reactor rises, the reactor containment vessel 6 can be cooled. In particular, an annular region 25 surrounding the reactor containment vessel 6 is formed between the reactor well seal device 17 and the upper end surface 24 of the biological shielding wall 16 over the entire circumference in the circumferential direction. In addition, a plurality of (for example, six) openings 42 for discharging cooling water to the region 25 are formed, so that the cooling water supplied to the region 25 is uniformly supplied in the circumferential direction of the gap 26. can do. Installation of a pressure suppression chamber in which the pressure suppression chamber 8 is disposed for all cooling water that falls while cooling the outer surface of the reactor containment vessel 6 over the entire circumference in the circumferential direction of the reactor containment vessel 6 in the gaps 26 and 27. It can be collected in the chamber 28.

  In the present embodiment, the pressure suppression chamber 8 can be cooled by the cooling water collected in the pressure suppression chamber installation chamber 28, and the cooling water in the pressure suppression pool 11 formed in the pressure suppression chamber 8. Can also be cooled. Since the cooling water in the pressure suppression pool 11 can be cooled, the steam released from the dry well 43 to the cooling water in the pressure suppression pool 11 in the pressure suppression chamber 8 can be efficiently condensed for a long time. For this reason, the reduction degree of the pressure in the dry well 43 can be increased.

  In this embodiment, the pressure suppression chamber installation chamber 28 is used as a region for installing the pressure suppression chamber 8 and a recovery region for cooling water that has cooled the dry well container 44. Furthermore, the pressure suppression chamber installation chamber 28 is used. It is also used to cool the pressure suppression chamber 8 installed inside.

  In this embodiment, since the cooling water supply pipe 32 is installed in the pressure suppression chamber installation chamber 28, the clearance 26 is used to cool the reactor containment vessel 6 from the water storage tank 38 provided outside the reactor building 13. , 27 and recovered in the pressure suppression chamber installation chamber 28 can be reused for cooling the reactor containment vessel 6. For this reason, it is possible to effectively use the cooling water supplied from outside the reactor building 13 to the gap 26 through the cooling water supply pipe 37. Further, since a water level meter 41 for measuring the level of the cooling water in the pressure suppression chamber installation chamber 28 and a control device 40 for switching the opening and closing of the on-off valve 39 and the on-off valve 34 are provided, the clearance 26 from the water storage tank 38 is provided. It is possible to switch the cooling water supply to the cooling water supply from the pressure suppression chamber installation chamber 28 to the gap 26 in a short time.

  The cooling water flowing in the gaps 26 and 27 shields radiation from the dry well 43 to the outside. In addition, since the pressure suppression chamber 8 is submerged in the cooling water existing in the pressure suppression chamber installation chamber 28, the radiation emitted from the pressure suppression chamber 8 can be shielded by the cooling water in the pressure suppression chamber installation chamber 28. it can. In particular, the vapor discharged from the dry well 43 into the cooling water of the pressure suppression pool 11 in the pressure suppression chamber 8 contains a radioactive substance, and the radioactive substance contained in the cooling water of the pressure suppression pool 11 that condenses this vapor. Concentration increases. The radiation emitted from the radioactive material contained in the cooling water of the pressure suppression pool 11 is effectively shielded by the cooling water stored between the pressure suppression chamber 8 and the pressure suppression chamber installation chamber 28 through the gaps 26 and 27. can do.

  DESCRIPTION OF SYMBOLS 1 ... Reactor, 2 ... Reactor pressure vessel, 4 ... Core, 6 ... Reactor containment vessel, 8 ... Pressure suppression chamber, 11 ... Pressure suppression pool, 13 ... Reactor building, 14 ... Reactor well, 16 ... Living body Shielding wall, 17 ... Reactor well seal device, 18, 19, 21, 22 ... Seal plate, 20, 23 ... Bellows, 24 ... Upper end surface of biological shielding wall, 25 ... Region, 26, 27 ... Gap, 28 ... Pressure Suppression chamber installation chamber, 31 ... reactor containment vessel cooling device, 32,37 ... cooling water supply piping, 34,39 ... open / close valve, 35 ... heat exchanger, 36 ... cooling water pump, 38 ... water storage tank, 40 ... control Apparatus, 41 ... Water level gauge, 42A-42F ... Opening, 43 ... Drywell.

Claims (7)

A dry well container that internally forms a dry well in which a reactor pressure vessel is disposed, a plurality of discharge pipes connected to the dry well container and connected to the dry well, and the respective discharge pipes are inserted A method of cooling a reactor containment vessel that has an annular pressure suppression chamber that surrounds the bottom of the dry well vessel and has a pressure suppression pool formed therein,
Supplying cooling water into an annular first gap formed between a biological shielding wall that is part of a reactor building and surrounding the dry well container, and the dry well container;
The cooling water that falls in the first gap while cooling the dry well container passes through an annular second gap formed around the discharge pipe, and the annular pressure suppression chamber is installed. Recovered in an annular pressure suppression chamber installation room surrounding the bottom of the dry well container,
A method for cooling a reactor containment vessel, wherein the cooling water collected in the pressure suppression chamber installation chamber is supplied into the first gap.   The cooling water is supplied to the first gap in the reactor well that seals between the dry well container and the inner wall of the reactor well formed immediately above the dry well container outside the dry well container. Formed between the sealing device and the upper end surface of the biological shield positioned below the reactor well sealing device, and the upper end of the first gap is on the entire circumference in the circumferential direction of the dry well container The method for cooling a reactor containment vessel according to claim 1, wherein the cooling water is supplied to an annular region that is open over the whole.   The reactor containment vessel cooling according to claim 2, wherein the cooling water is supplied to the annular region through a plurality of openings formed in an upper end surface of the biological shield in the circumferential direction of the dry well vessel. Method.   The reactor containment vessel according to any one of claims 1 to 3, wherein the cooling water recovered in the pressure suppression chamber installation chamber is supplied into the first gap after the cooling water is cooled. Cooling method.   Supply of the cooling water into the first gap is performed by cooling water supplied from the outside of the reactor building, and when the water level of the cooling water collected in the pressure suppression chamber installation chamber reaches set water The supply of the cooling water from the outside of the reactor building to the first gap is stopped, and the cooling water is supplied from the pressure suppression chamber installation chamber to the first gap. The method for cooling a reactor containment vessel according to any one of the above. A dry well container that internally forms a dry well in which a reactor pressure vessel is disposed, a plurality of discharge pipes connected to the dry well container and connected to the dry well, and the respective discharge pipes are inserted A reactor containment vessel having an annular pressure suppression chamber surrounding the bottom of the dry well vessel and having a pressure suppression pool formed therein is installed inside, and an annular shape surrounding the dry well vessel with the dry well vessel An annular pressure suppression chamber installation chamber surrounding the bottom of the dry well container is provided, the annular pressure suppression chamber is installed. It is installed in the reactor building to be formed, one end is inserted into the pressure suppression chamber installation chamber, and the cooling water collected in the pressure suppression chamber installation chamber is Ku: a first cooling water supply pipe,
A first on-off valve and a cooling device provided in the first cooling water supply pipe;
A pump provided in the first cooling water supply pipe downstream of the first on-off valve and the cooling device;
A second on-off valve is provided downstream of the first on-off valve and the cooling device and connected to the first cooling water supply pipe upstream of the pump, and is provided from the outside of the reactor building to the inside of the reactor building. A second cooling water supply pipe extending and guiding cooling water from the outside of the reactor building;
A seal is provided between the inner wall of the reactor well and the dry well container that is connected to the first cooling water supply pipe downstream of the pump and is formed directly above the dry well container on the outside of the dry well container. Formed between the reactor well seal device and the upper end surface of the biological shield positioned below the reactor well seal device, and the upper end of the first gap is in the circumferential direction of the dry well container. A reactor containment vessel cooling apparatus, comprising: a plurality of branch pipes connected to an annular region that is open over the entire circumference.   A water level meter that measures the water level of the cooling water in the pressure suppression chamber installation chamber, and when the water level measured by the water level gauge rises to a set water level, the first on-off valve is opened and the second on-off valve is closed. The reactor containment vessel cooling device according to claim 6, further comprising a control device.

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