Cooling device of reactor containment vessel

Abstract

To provide a cooling device of a reactor containment vessel, which achieves the improvement in cooling performance.SOLUTION: In a nuclear reactor facility having a nuclear reactor inside a reactor containment vessel, a cooling device of the reactor containment vessel includes: a cooling water supply unit for supplying cooling water to the outside of an upper part of the reactor containment vessel at the time of occurrence of an accident in the nuclear reactor; a flow channel formation member forming a flow channel along the inside of the upper part of the reactor containment vessel; and a gas introduction flow channel for introducing gas inside the nuclear reactor to the flow channel at the time of occurrence of the accident in the nuclear reactor.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a cooling system for a nuclear reactor containment vessel. [Background technology]

[0002] The reactor is disposed inside a reactor containment vessel. When a reactor accident occurs, the reactor containment vessel becomes filled with steam, becomes hot, and the pressure increases, which may cause damage. For this reason, a cooling device is provided to cool the reactor containment vessel. An example of a cooling device for a reactor containment vessel is described in Patent Document 1 below. The cooling device for a reactor containment vessel described in Patent Document 1 has a pool section that stores cooling water in the upper part of the reactor containment vessel, and in the event of a reactor accident, the cooling water from the pool section falls to cool the reactor containment vessel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2023-78930 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a reactor accident occurs, steam inside the reactor is released into the reactor containment vessel. The steam released into the reactor containment vessel accumulates inside the ceiling of the reactor containment vessel and heats the reactor containment vessel. Here, the reactor containment vessel is flooded with cooling water that falls from the pool onto the outside of the ceiling, so that the steam that accumulates inside the ceiling is condensed and cooled by dissipating heat. However, the reactor contains air as a non-condensable gas, and in the early stage of a reactor accident, the air inside the reactor is released into the reactor containment vessel and accumulates inside the ceiling. Therefore, even if the ceiling of the reactor containment vessel is flooded with cooling water, it becomes difficult to efficiently cool and condense the steam due to the air that accumulates inside the ceiling, and there is a risk of a decrease in cooling performance.

[0005] The present disclosure is devised to solve the above-mentioned problems, and has an object to provide a cooling device for a reactor containment vessel that improves cooling performance. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the cooling device for a reactor containment vessel of the present disclosure is a reactor facility in which a reactor is disposed inside a reactor containment vessel, and includes a cooling water supply device that supplies cooling water to the outside of an upper part of the reactor containment vessel in the event of an accident at the reactor, a flow path forming member that forms a flow path along the inner surface of the upper part of the reactor containment vessel, and a gas introduction flow path that introduces gas inside the reactor into the flow path in the event of an accident at the reactor. Effect of the Invention

[0007] According to the cooling device for a reactor containment vessel of the present disclosure, it is possible to improve the cooling performance. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing a nuclear reactor facility according to a first embodiment. [Diagram 2] FIG. 2 is a schematic front view showing the cooling system for a reactor containment vessel according to the first embodiment. [Diagram 3] FIG. 3 is a schematic plan view showing a cooling system for a reactor containment vessel. [Figure 4] FIG. 4 is a schematic diagram showing a main part of a cooling device for a reactor containment vessel according to the second embodiment. [Diagram 5] FIG. 5 is a schematic diagram showing a main part of a cooling device for a containment vessel according to the third embodiment. [Figure 6] FIG. 6 is a schematic diagram showing the non-condensed gas exhaust section. [Figure 7] FIG. 7 is a schematic front view showing a cooling system for a reactor containment vessel according to the fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Preferred embodiments of the present disclosure will be described in detail below with reference to the drawings. Note that the present disclosure is not limited to these embodiments, and when there are multiple embodiments, the present disclosure also includes a configuration in which each embodiment is combined. In addition, the components in the embodiments include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range.

[0010] [First embodiment] <Reactor equipment> FIG. 1 is a schematic diagram showing a nuclear reactor facility according to a first embodiment.

[0011] Although not shown, the nuclear power plant has a nuclear reactor arranged in a reactor containment vessel and a steam turbine power generation facility. The nuclear reactor in this embodiment is a pressurized water reactor (PWR). However, the nuclear reactor may be any type of nuclear reactor, such as a boiling water reactor (BWR) or a fast breeder reactor (FBR).

[0012] As shown in Fig. 1, a nuclear reactor facility 10 includes a building 11, a reactor containment vessel 12, and a nuclear reactor 13. The building 11 has the reactor containment vessel 12 disposed therein, and the reactor containment vessel 12 has the reactor 13 disposed therein.

[0013] The reactor 13 has a reactor vessel 21, a fuel core 22, a steam generator 23, and a control rod drive mechanism 24. The reactor vessel 21 is a pressure vessel that can be sealed by fixing a lid to the top of the vessel body. Reactor internals (not shown) are arranged inside the reactor vessel 21. The fuel core 22 is arranged in the lower part of the reactor vessel 21 and supported by the reactor internals. The steam generator 23 is arranged in the middle of the reactor vessel 21 and supported by the reactor internals. The control rod drive mechanism 24 is arranged in the upper part of the reactor vessel 21 and supported by the reactor internals.

[0014] The core fuel 22 heats light water as primary cooling water, and the high-temperature primary cooling water rises and is then sent to the steam generator 23. The steam generator 23 exchanges heat between the high-temperature, high-pressure primary cooling water and the secondary cooling water, and the primary cooling water with a reduced temperature descends by natural circulation and is returned to the core fuel 22. The steam generator 23 also heats the secondary cooling water with the high-temperature, high-pressure primary cooling water to generate steam.

[0015] The reactor 13 is disposed inside a reactor containment vessel 12. The reactor containment vessel 12 is a pressure vessel that can be sealed by fixing a lid to the top of the vessel body. The reactor containment vessel 12 is disposed inside a building 11.

[0016] <Cooling device> FIG. 2 is a schematic front view showing the cooling system for a reactor containment vessel of the first embodiment, and FIG. 3 is a schematic plan view showing the cooling system for a reactor containment vessel.

[0017] As shown in Fig. 1, the nuclear reactor facility 10 includes a cooling system 14 for a reactor containment vessel 12. The cooling system 14 includes a cooling water supply system 31. The cooling water supply system 31 supplies cooling water to the outside of the upper part of the reactor containment vessel 12 in the event of an accident in the reactor 13.

[0018] A steam exhaust passage 25 is provided at the top of the reactor 13. The lower end of the steam exhaust passage 25 communicates with the inside of the reactor vessel 21, and the upper end opens into the inside of the reactor containment vessel 12. An on-off valve 26 is provided in the steam exhaust passage 25. By opening the on-off valve 26, steam inside the reactor vessel 21 is exhausted through the steam exhaust passage 25 into the inside of the reactor containment vessel 12.

[0019] In the building 11, a water tank 41 is disposed above the reactor containment vessel 12. The water tank 41 stores a quantity of cooling water that can submerge the reactor containment vessel 12 inside the building 11. The water tank 41 is provided with a drainage channel 42 capable of supplying cooling water to the area of ​​the building 11 where the reactor containment vessel 12 is disposed. The number of drainage channels 42 is not limited to one, but multiple drainage channels 42 may be provided. The drainage channel 42 is provided with an on-off valve 43. By opening the on-off valve 43, the cooling water in the water tank 41 is supplied through the drainage channel 42 to the area of ​​the building 11 where the reactor containment vessel 12 is disposed.

[0020] The on-off valve 26 and the on-off valve 43 are connected to a control device 44. A detector 45 is connected to the control device 44. The detector 45 can detect the temperature of the reactor 13, that is, the temperature inside the reactor vessel 21. The control device 44 controls the opening and closing of the on-off valve 26 and the on-off valve 43 according to the temperature of the reactor 13 detected by the detector 45. Specifically, the control device 44 closes the on-off valve 26 and the on-off valve 43 when the reactor 13 is stopped or during normal operation of the reactor 13. On the other hand, when the temperature of the reactor 13 reaches a preset predetermined temperature, the control device 44 opens the on-off valve 26 and the on-off valve 43. Here, the predetermined temperature is a temperature at which the reactor vessel 21 may be damaged due to an increase in the internal temperature and internal pressure of the reactor vessel 21 when an accident occurs in the reactor 13.

[0021] When the on-off valve 26 is opened, the steam S inside the reactor vessel 21 is discharged into the reactor containment vessel 12 through the steam exhaust passage 25, and accumulates inside the ceiling of the reactor containment vessel 12. When the on-off valve 43 is opened, the cooling water in the water tank 41 is supplied to the reactor containment vessel 12 through the drain passage 42, and the outside of the ceiling of the reactor containment vessel 12 is flooded. Therefore, the steam S that accumulates inside the ceiling of the reactor containment vessel 12 is cooled and condensed by the cooling water on the outside of the ceiling of the reactor containment vessel 12. As a result, the reactor containment vessel 12 is cooled.

[0022] However, air A exists as a non-condensable gas inside the reactor 13. In the early stage of an accident occurring in the reactor 13, the air (non-condensable gas) A inside the reactor 13 is released into the reactor containment vessel 12 and accumulates inside the ceiling, hindering cooling by the cooling water outside the ceiling of the reactor containment vessel 12.

[0023] Therefore, in this embodiment, the retention of air (non-condensed gas) A inside the ceiling portion of the reactor containment vessel 12 is suppressed to promote cooling of the reactor containment vessel 12. As shown in Fig. 2 and Fig. 3, the cooling device 14 includes a flow path forming member 32 and a gas introduction flow path 33 in addition to the cooling water supply device 31.

[0024] The flow passage forming member 32 has a hollow shape and forms a flow passage 34 along the upper inner surface 12a of the reactor containment vessel 12. The flow passage forming member 32 has a plurality of divided flow passage forming members 51 arranged radially downward from the top of the reactor containment vessel 12, and the flow passage 34 has a plurality of divided flow passages 52 formed by the plurality of divided flow passage forming members 51.

[0025] That is, the reactor containment vessel 12 has a cylindrical shape centered on an axis O along the vertical direction, and the ceiling portion has a hemispherical shape centered on the axis O. The divided flow passage forming members 51 and the divided flow passages 52 have base ends that gather and communicate at the position of the axis O, and their tips extend radially outward from the position of the axis O of the reactor containment vessel 12. The divided flow passages 52 are provided at their tips with discharge portions 53 that open into the inside of the reactor containment vessel 12.

[0026] The gas introduction passage 33 introduces gas inside the reactor 13 into the passage 34 when an accident occurs in the reactor 13. The gas introduction passage 33 is disposed vertically at the position of the axis O, with one end connected to the tip of the steam discharge passage 25 and the other end connected to a collective portion of the multiple divided passage forming members 51 at the position of the axis O. Note that, although the gas introduction passage 33 and the steam discharge passage 25 are described as separate members in this embodiment, they may be an integrated member. That is, one end of the gas introduction passage 33 may be connected to the upper portion of the reactor vessel 21, and an opening / closing valve 26 may be provided.

[0027] <Cooling system operation> As shown in Fig. 1 and Fig. 2, during normal operation of the reactor 13, the temperature of the reactor 13 is lower than a predetermined temperature, so the control device 44 closes the on-off valve 26 and the on-off valve 43. On the other hand, when an accident occurs in the reactor 13 and the temperature of the reactor 13 reaches a preset predetermined temperature, the control device 44 opens the on-off valve 26 and the on-off valve 43. Then, the gas in the reactor 13 rises from the steam exhaust passage 25 through the gas introduction passage 33 and is supplied to the passage 34 of the passage forming member 32. The cooling water in the water tank 41 is supplied to the outside of the reactor containment vessel 12 through the drain passage 42, and the reactor containment vessel 12 is flooded. At this time, at least the upper half of the reactor containment vessel 12 is flooded.

[0028] At this time, air A exists inside the reactor 13 as a non-condensable gas, and when the on-off valve 26 is closed, first, the air (non-condensable gas) A of the reactor 13 rises from the steam exhaust passage 25 through the gas introduction passage 33 and is supplied to the passage 34 of the passage formation member 32. Next, the steam (condensed gas) S of the reactor 13 rises from the steam exhaust passage 25 through the gas introduction passage 33 and is supplied to the passage 34 of the passage formation member 32.

[0029] Here, the air A first supplied to the flow passage 34 of the flow passage forming member 32 is pushed by the steam S subsequently supplied to the flow passage 34 of the flow passage forming member 32, pushed out into each divided flow passage 52 of each divided flow passage forming member 51, and discharged from the discharge portion 53 to the inside lateral side of the reactor containment vessel 12. Therefore, the air A is prevented from accumulating near the ceiling portion of the reactor containment vessel 12, i.e., the upper inner surface 12a.

[0030] In the reactor containment vessel 12, the upper outer surface 12b is cooled by the cooling water, so that the steam S supplied to the upper inner surface 12a side, i.e., the flow passage 34 of the flow passage forming member 32, is cooled and condensed to become water, which is discharged from the discharge part 53 into the inside of the reactor containment vessel 12. As a result, the reactor containment vessel 12 is appropriately cooled without the cooling by the cooling water being hindered by the air A remaining in the ceiling part.

[0031] [Second embodiment] Fig. 4 is a schematic diagram of a main part of a cooling device for a reactor containment vessel according to a second embodiment. The basic configuration of the second embodiment is similar to that of the first embodiment described above, and will be described with reference to Fig. 2. Members having the same functions as those of the first embodiment described above are given the same reference numerals and will not be described in detail.

[0032] 2 and 4, the cooling device 14 includes a cooling water supply device 31, a flow path forming member 32, and a gas introduction flow path 33. The basic configurations of the cooling water supply device 31, the flow path forming member 32, and the gas introduction flow path 33 are similar to those of the first embodiment.

[0033] In the second embodiment, the flow path forming member 32 has a first discharge portion 61 and a second discharge portion 62.

[0034] The first exhaust section 61 exhausts air A as a non-condensed gas. The second exhaust section 62 is disposed upstream of the first exhaust section 61 in the flow direction of the gas (air A, steam S), and exhausts steam S (actually, water condensed from the steam S). The first exhaust section 61 is provided at the tip of the divided flow path 52, and has a configuration substantially similar to that of the exhaust section 53 (see FIG. 2) of the first embodiment.

[0035] The second discharge section 62 has a second casing 63 and a float 64. The second casing 63 has a hollow box shape, and the upper part communicates with the divided flow path 52 through a second inlet path 65. The second casing 63 also has a second discharge path 66 that opens to the outside at the lower part. The second discharge path 66 discharges condensed water to the outside. The float 64 has a spherical shape and floats on the condensed water. The float 64 is disposed inside the second casing 63 and floats to open and close the second discharge path 66 according to the amount of condensed water supplied. That is, when there is little condensed water in the second casing 63, the float 64 closes the second discharge path 66 by its own weight. On the other hand, when there is condensed water in the second casing 63, the float 64 floats on the condensed water and opens the second discharge path 66.

[0036] Therefore, the air A supplied to the flow passage 34 of the flow passage forming member 32 is pushed into each divided flow passage 52 by the steam S supplied to the flow passage 34 of the flow passage forming member 32, and is discharged from the first discharge part 61 to the reactor containment vessel 12. In addition, the steam S flowing through each divided flow passage 52 of the flow passage forming member 32 is cooled by the cooling water on the upper outer surface 12b of the reactor containment vessel 12, condenses, and becomes water, which flows to the second discharge part 62.

[0037] Here, when there is little condensed water in the second casing 63 of the second discharge part 62, the float 64 closes the second discharge path 66. When the second discharge part 62 is closed, the steam S temporarily stays in the divided flow path 52, and the steam S is actively cooled by the cooling water on the upper outer surface 12b of the reactor containment vessel 12, promoting condensation. Then, when the condensed water supplied to the second casing 63 increases and reaches a certain water level, the float 64 floats and opens the second discharge path 66. Then, the condensed water in the divided flow path 52 is discharged from the second discharge part 62.

[0038] [Third embodiment] Fig. 5 is a schematic diagram of a main part of a cooling device for a reactor containment vessel according to a third embodiment, and Fig. 6 is a schematic diagram of a non-condensed gas discharge section. The basic configuration of the third embodiment is similar to that of the first embodiment described above, and will be described using Fig. 2. Members having the same functions as those of the first embodiment described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

[0039] 2 and 5, the cooling device 14 includes a cooling water supply device 31, a flow path forming member 32, and a gas introduction flow path 33. The basic configurations of the cooling water supply device 31, the flow path forming member 32, and the gas introduction flow path 33 are similar to those of the first embodiment.

[0040] In the third embodiment, the flow path forming member 32 has a first discharge portion 71 and a second discharge portion 62.

[0041] The first exhaust section 71 exhausts air A as a non-condensed gas. The second exhaust section 62 is disposed upstream of the first exhaust section 71 in the flow direction of the gas (air A, steam S), and exhausts the steam S (actually, water condensed from the steam S). The second exhaust section 62 is the same as in the second embodiment.

[0042] As shown in FIG. 5 and FIG. 6, the first discharge section 71 has a first casing 72, a communication passage 73, and a valve member 74. The first casing 72 has a hollow box shape, and a communication passage 73 is defined by partition members 75, 76 arranged inside. The partition member 75 is arranged so as to hang down from the ceiling part of the first casing 72. The partition member 76 is arranged in the horizontal direction from the side wall of the first casing 72, and is arranged so that the end part hangs down. In the first casing 72, one end of the communication passage 73 communicates with the divided flow path 52 through the first inlet passage 77, and the other end of the communication passage 73 communicates with the first discharge passage 78. The valve member 74 is arranged below the partition members 75, 76 in the first casing 72. When the valve member 74 reaches a predetermined temperature, it expands and comes into contact with the partition members 75, 76 to close the communication passage 73.

[0043] That is, when high-temperature air A is not supplied to the first casing 72, the valve member 74 is in a contracted state (solid line in FIG. 6) and opens the communication passage 73 without coming into contact with the lower parts of the partition members 75, 76. On the other hand, when high-temperature air A is supplied to the first casing 72, the temperature of the valve member 74 rises and the valve member 74 enters an expanded state (dotted chain line in FIG. 6) and comes into contact with the lower parts of the partition members 75, 76 to close the communication passage 73. The valve member 74 is made of a material that expands when heated, and is formed of, for example, resin.

[0044] Therefore, the air A supplied to the flow path 34 of the flow path forming member 32 is pushed out into each divided flow path 52 by the steam S supplied to the flow path 34 of the flow path forming member 32, and flows to the first discharge section 61. At this time, the valve member 74 is at a low temperature and in a contracted state, and opens the communicating passage 73, so that the air A is discharged by the first discharge section 61. Following the air A, steam S is supplied to the flow path 34 of the flow path forming member 32, and the steam S flows to the first discharge section 61. Then, the valve member 74 is heated by the steam S, the temperature rises, and the valve member 74 enters an expanded state, closing the communicating passage 73, and discharge of the steam S from the first discharge section 61 is prevented.

[0045] Since the steam S is prevented from being discharged from the first discharge part 71 and the second discharge part 62, it temporarily remains in the divided flow passage 52. Then, the steam S is actively cooled by the cooling water on the upper outer surface 12b of the reactor containment vessel 12, and condensation is promoted. Then, when the amount of condensed water supplied to the second casing 63 in the second discharge part 62 increases and reaches a certain water level, the float 64 floats and opens the second discharge passage 66. Then, the condensed water in the divided flow passage 52 is discharged from the second discharge part 62.

[0046] [Fourth embodiment] 7 is a schematic front view showing a cooling device for a reactor containment vessel according to a fourth embodiment. Note that members having the same functions as those in the first embodiment described above are given the same reference numerals and detailed description thereof will be omitted.

[0047] 7, the cooling device 14 includes a blower 81. The cooling device 14 may include a cooling water supply device 31, a flow path forming member 32, and a gas introduction flow path 33, as in each of the above-described embodiments.

[0048] The blower 81 is disposed above the reactor 13 inside the reactor containment vessel 12. A plurality of blowers 81 are disposed below the upper inner surface 12a of the reactor containment vessel 12. The blowers 81 may be disposed below and spaced a predetermined distance from the upper inner surface 12a of the reactor containment vessel 12. It is preferable that the blower 81 blows air toward the upper inner surface 12a of the reactor containment vessel 12.

[0049] When an accident occurs in the reactor 13 and the temperature of the reactor 13 reaches a predetermined temperature, the on-off valve 26 and the on-off valve 43 are opened. Then, the gas in the reactor 13 rises up the steam exhaust passage 25 and accumulates near the upper inner surface 12a of the reactor containment vessel 12. In addition, the cooling water in the water tank 41 is supplied to the outside of the reactor containment vessel 12 through the drain passage 42, and the reactor containment vessel 12 becomes flooded.

[0050] At this time, the control device 44 drives the blower 81. Then, the air A stagnating near the upper inner surface 12a of the reactor containment vessel 12 is diffused by the blowing of air by the blower 81, and the stagnation is suppressed. Therefore, the upper outer surface 12b of the reactor containment vessel 12 is cooled by the cooling water, and the steam S is cooled and condensed, so that the reactor containment vessel 12 is appropriately cooled.

[0051] [Effects of this embodiment] The cooling device for a reactor containment vessel in the first embodiment includes a cooling water supply device 31 that supplies cooling water to the outside of the upper part of the reactor containment vessel 12 in the event of an accident in the reactor 13, a flow path forming member 32 that forms a flow path 34 along the upper inner surface 12a of the reactor containment vessel 12, and a gas introduction flow path 33 that introduces gas inside the reactor 13 into the flow path 34 in the event of an accident in the reactor 13.

[0052] According to the cooling device for the reactor containment vessel of the first aspect, when an accident occurs in the reactor 13, the cooling water supply device 31 supplies cooling water to the outside of the upper part of the reactor containment vessel 12, and the gas inside the reactor 13 rises through the gas introduction passage 33 and is introduced into the passage 34 of the passage forming member 32. At this time, the air (non-condensed gas) A of the reactor 13 is first supplied to the passage 34, and then the steam (condensed gas) S of the reactor 13 is supplied to the passage 34. Here, the air A first supplied to the passage 34 is pushed by the steam S subsequently supplied to the passage 34, and is pushed out toward the tip end side of the passage 34. Therefore, the retention of the air A in the ceiling part of the reactor containment vessel 12 is suppressed, and the steam S supplied to the ceiling part of the reactor containment vessel 12 is appropriately cooled and condensed by the cooling water, and the reactor containment vessel 12 can be efficiently cooled. As a result, the cooling performance of the reactor containment vessel 12 can be improved.

[0053] The cooling device for a reactor containment vessel according to the second embodiment is the cooling device for a reactor containment vessel according to the first embodiment, further, the flow path forming member 32 forms flow paths 34 arranged radially downward from the top of the reactor containment vessel 12. This allows the air A first supplied to the flow paths 34 to be quickly removed from the ceiling part of the reactor containment vessel 12 by the steam S subsequently supplied to the flow paths 34, and the steam S supplied to the ceiling part of the reactor containment vessel 12 can be quickly cooled and condensed by the cooling water.

[0054] The cooling device for a reactor containment vessel according to the third aspect is the cooling device for a reactor containment vessel according to the first or second aspect, further comprising a base end of the flow path 34 which is connected to the gas introduction flow path 33, and a tip end of which is provided with an outlet 53, 61, 62, 71 which opens into the inside of the reactor containment vessel 12. This allows the air A initially supplied to the flow path 34 to be discharged to the outside from the outlet 53, 61, 62, 71, and allows the steam S supplied to the ceiling portion of the reactor containment vessel 12 to be quickly cooled and condensed by the cooling water.

[0055] The cooling device for a reactor containment vessel according to the fourth aspect is the cooling device for a reactor containment vessel according to the third aspect, and further includes, as discharge parts, a first discharge part 61, 71 that discharges non-condensable gas, and a second discharge part 62 that discharges condensed water and is disposed upstream of the first discharge part 61, 71. This allows the air A and the steam S to be discharged from different discharge parts 61, 62, 71.

[0056] The cooling device for a reactor containment vessel according to the fifth aspect is the cooling device for a reactor containment vessel according to the fourth aspect, further comprising: a second casing 63 in which a second discharge passage 66 communicating with the flow passage 34 and discharging the condensed water is provided; and a float 64 disposed inside the second casing 63 and floating according to the supply amount of the condensed water to open and close the second discharge passage 66. This allows the steam S to be temporarily retained in the flow passage 34, and the condensation of the steam S can be promoted.

[0057] The cooling device for a reactor containment vessel according to the sixth aspect is the cooling device for a reactor containment vessel according to the fourth or fifth aspect, and further, the first discharge part 71 has a first casing 72 in which a first discharge passage 78 communicating with the flow path 34 and discharging non-condensed gas is provided, a communication passage 73 communicating the flow path 34 and the first discharge passage 78 inside the first casing 72, and a valve member 74 disposed inside the first casing 72 and closing the communication passage 73 when a preset predetermined temperature is reached. As a result, by suppressing the discharge of the steam S from the first discharge part 71 after the air A is discharged from the first discharge part 71, the steam S can be temporarily retained in the flow path 34 and condensation of the steam S can be promoted.

[0058] The cooling device for a reactor containment vessel according to a seventh aspect is the cooling device for a reactor containment vessel according to any one of the first to sixth aspects, and further includes a blower 81 disposed above the reactor 13 inside the reactor containment vessel 12. As a result, the air A remaining in the ceiling portion of the reactor containment vessel 12 is diffused by the blower 81, so that the steam S supplied to the ceiling portion of the reactor containment vessel 12 can be quickly cooled and condensed by the cooling water. [Explanation of symbols]

[0059] 10 Nuclear reactor equipment 11 Building 12 Reactor Containment Vessel 13 nuclear reactor 14 Cooling device 21 Reactor vessel 22 Core fuel 23 Steam Generator 24 Control Rod Drive Mechanism 25 Steam exhaust passage 26 On-off valve 31 Cooling water supply device 32 Flow path forming member 33 Gas introduction channel 34 Flow Path 41 Water Tank 42 Drainage Channel 43 On-off valve 44 Control device 45 Detector 51 Divided flow path forming member 52 Divided Channel 53 Discharge section 61 1st discharge section 62 2nd discharge section 63 Second Casing 64 Float 65 Second inflow channel 66 2nd discharge path 71 1st discharge section 72 First casing 73 Communication path 74 Valve member 75,76 Partition members 77 1st inflow channel 78 1st discharge channel 81 Blower A Air (non-condensable gas) S Steam (condensed gas)

Claims

1. In a nuclear reactor facility in which a nuclear reactor is disposed inside a reactor containment vessel, a cooling water supply device that supplies cooling water to the outside of an upper portion of the reactor containment vessel in the event of an accident at the reactor; a flow passage forming member that forms a flow passage along an upper inner surface of the reactor containment vessel; a gas introduction passage that introduces gas inside the reactor into the passage when an accident occurs in the reactor; A reactor containment vessel cooling system comprising:

2. The flow passage forming member forms the flow passages arranged radially downward from the top of the reactor containment vessel. The cooling system for a nuclear reactor containment vessel according to claim 1.

3. The flow path has a base end connected to the gas introduction flow path, and a tip end provided with an exhaust port that opens into the inside of the reactor containment vessel. The cooling system for a nuclear reactor containment vessel according to claim 2.

4. The discharge section has a first discharge section that discharges non-condensed gas, and a second discharge section that is disposed upstream of the first discharge section and discharges condensed water. The cooling system for a nuclear reactor containment vessel according to claim 3.

5. The second discharge section includes a second casing in which a second discharge passage communicating with the flow path and discharging condensed water is provided, and a float disposed inside the second casing and floating in response to a supply amount of condensed water to open and close the second discharge passage. The cooling system for a nuclear reactor containment vessel according to claim 4.

6. The first discharge section includes a first casing in which a first discharge passage communicating with the flow path and discharging non-condensed gas is provided, a communication passage communicating the flow path and the first discharge passage inside the first casing, and a valve member disposed inside the first casing and closing the communication passage when a preset predetermined temperature is reached. The cooling system for a nuclear reactor containment vessel according to claim 4 or 5.

7. A blower is disposed above the reactor within the reactor containment vessel. The cooling system for a nuclear reactor containment vessel according to claim 1.

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