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 header having nozzles which are arranged at positions facing the inside of the upper part of the reactor containment vessel so as to inject gas toward the inside of the upper part; and a gas introduction flow channel for introducing the gas inside the nuclear reactor to the header 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 nuclear reactor containment vessel that improves cooling performance. [Means for solving the problem]

[0006] In order to achieve the above-mentioned objective, 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 header that is positioned opposite the upper inner surface of the reactor containment vessel and has a nozzle capable of injecting gas toward the upper inner surface, and a gas introduction passage that introduces gas inside the reactor into the header 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 front view showing the cooling system 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 of a main part of a cooling device for a containment vessel according to the fourth embodiment. [Figure 7] FIG. 7 is a schematic front view showing a cooling system for a reactor containment vessel according to the fifth 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, 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 header 32 and a gas introduction passage 33 in addition to the cooling water supply device 31.

[0024] The header 32 is disposed at a position facing the upper inner surface 12a, a predetermined distance away from the upper inner surface 12a of the reactor containment vessel 12. The header 32 is hollow and has a nozzle 34 that injects gas toward the upper inner surface 12a of the reactor containment vessel 12. The header 32 has a plurality of divided headers 51 that are disposed radially downward from the top of the reactor containment vessel 12. The nozzles 34 are attached to the upper parts of the divided headers 51 in the vertical direction.

[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 multiple split headers 51 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 tips of the multiple split headers 51 are closed. And, the multiple split headers 51 each have a plurality of nozzles 34 attached to their upper portions at intervals.

[0026] The gas introduction passage 33 introduces gas inside the reactor 13 into the header 32 when an accident occurs in the reactor 13. The gas introduction passage 33 is disposed vertically at a position on 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 headers 51 at the position of the axis O. Note that, although the gas introduction passage 33 and the steam discharge passage 25 have been 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 thereon.

[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 header. 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 discharge passage 25 through the gas introduction passage 33 and is supplied to the header 32. When the air A is supplied to the header 32, the air A is sprayed from the multiple nozzles 34 toward the upper inner surface 12a of the reactor containment vessel 12. Next, the steam (condensed gas) S of the reactor 13 rises from the steam discharge passage 25 through the gas introduction passage 33 and is supplied to the header 32. When the steam S is supplied to the header 32, the steam S is sprayed from the multiple nozzles 34 toward the upper inner surface 12a of the reactor containment vessel 12.

[0029] Here, the air A initially sprayed from the nozzle 34 toward the upper inner surface 12a of the reactor containment vessel 12 temporarily remains near the upper inner surface 12a, but the air A is subsequently diffused by the steam S sprayed from the nozzle 34 toward the upper inner surface 12a of the reactor containment vessel 12. Therefore, the air A is prevented from remaining near the ceiling portion of the reactor containment vessel 12, i.e., the upper inner surface 12a.

[0030] Furthermore, when the air A is removed from the ceiling portion of the reactor containment vessel 12, the steam S injected from the nozzle 34 directly collides with the upper inner surface 12a of the reactor containment vessel 12. The upper outer surface 12b of the reactor containment vessel 12 is cooled by cooling water, and when the steam S comes into contact with the cooled upper inner surface 12a of the reactor containment vessel 12, the steam S is cooled and condensed, and falls as water. As a result, the reactor containment vessel 12 is appropriately cooled without being hindered by the air A remaining in the ceiling portion and thus cooled by the cooling water.

[0031] [Second embodiment] 4 is a schematic diagram of a main part of a cooling device for a reactor containment vessel according to a second 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.

[0032] 4, the cooling device 14 includes a cooling water supply device 31, a header 32, and a gas introduction passage 33. The basic configurations of the cooling water supply device 31, the header 32, and the gas introduction passage 33 are similar to those in the first embodiment.

[0033] In the second embodiment, a water-repellent layer 61 is provided on the upper inner surface 12a of the reactor containment vessel 12. The water-repellent layer 61 is formed by applying a water-repellent paint to the upper inner surface 12a of the reactor containment vessel 12. For example, a fluorine coating agent is used as the water-repellent paint.

[0034] Therefore, the multiple nozzles 34 provided in the header 32 inject the steam S, followed by the air A, toward the upper inner surface 12a of the reactor containment vessel 12, thereby removing the air A from the ceiling portion of the reactor containment vessel 12. When the steam S injected from the nozzles 34 directly collides with the upper inner surface 12a of the reactor containment vessel 12, the steam S is cooled and condensed by contacting the cooled upper inner surface 12a of the reactor containment vessel 12, and falls as water.

[0035] At this time, the condensed water generated by cooling and condensing the steam S may adhere to the upper inner surface 12a of the reactor containment vessel 12 and form a liquid film. However, the reactor containment vessel 12 has a water-repellent layer 61 on the upper inner surface 12a, which suppresses the formation of the liquid film. As a result, the reactor containment vessel 12 is appropriately cooled by the cooling water to condense the steam S, thereby being appropriately cooled.

[0036] [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. The basic configuration of the third 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.

[0037] 2 and 5, the cooling device 14 includes a cooling water supply device 31, a header 32, and a gas introduction passage 33. The basic configurations of the cooling water supply device 31, the header 32, and the gas introduction passage 33 are similar to those of the first embodiment.

[0038] In the third embodiment, the reactor containment vessel 12 is provided with a partition wall 71 on the upper inner surface 12a. The partition wall 71 is provided on the upper inner surface 12a of the reactor containment vessel 12 along the circumferential direction. The partition wall 71 has a cylindrical shape. A plurality of partition walls 71 are provided at intervals in the radial direction. That is, a plurality of partition walls 71 having different radial dimensions about the axis O are fixed to the upper inner surface 12a of the reactor containment vessel 12. The header 32 is arranged such that the plurality of nozzles 34 face the regions between the plurality of partition walls 71. That is, the gas (air A, steam S) injected from the plurality of nozzles 34 directly impinges on the upper inner surface 12a without impinging on the partition wall 71.

[0039] Therefore, the multiple nozzles 34 provided in the header 32 inject the steam S, followed by the air A, toward the upper inner surface 12a of the reactor containment vessel 12, thereby removing the air A from the ceiling portion of the reactor containment vessel 12. When the steam S injected from the nozzles 34 directly collides with the upper inner surface 12a of the reactor containment vessel 12, the steam S is cooled and condensed by contacting the cooled upper inner surface 12a of the reactor containment vessel 12, and falls as water.

[0040] At this time, the multiple nozzles 34 inject the steam S toward the upper inner surface 12a between the multiple partition walls 71. The steam S then collides with the upper inner surface 12a and is cooled to become condensed water, which flows along each partition wall 71 and drops from the lower end of each partition wall 71. This suppresses the formation of a liquid film of condensed water on the upper inner surface 12a of the reactor containment vessel 12. In addition, the partition walls 71 increase the area of ​​the reactor containment vessel 12 side with which the steam S comes into contact, thereby improving the condensation performance of the steam S.

[0041] As in the second embodiment, it is preferable to provide a water-repellent layer on both the upper inner surface 12a of the reactor containment vessel 12 and the partition wall 71. The water-repellent layer suppresses the formation of a liquid film of condensed water.

[0042] [Fourth embodiment] Fig. 6 is a schematic diagram of a main part of a cooling device for a reactor containment vessel according to a fourth embodiment. The basic configuration of the third 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.

[0043] 2 and 6, the cooling device 14 includes a cooling water supply device 31, a header 32, and a gas introduction passage 33. The basic configurations of the cooling water supply device 31, the header 32, and the gas introduction passage 33 are similar to those of the first embodiment.

[0044] In the fourth embodiment, a partition wall 71 is provided on the upper inner surface 12a of the reactor containment vessel 12. The partition wall 71 is provided along the circumferential direction on the upper inner surface 12a of the reactor containment vessel 12. A plurality of partition walls 71 are provided at intervals in the radial direction. Furthermore, a water storage section 72 is provided at the lower end in the vertical direction of the partition wall 71. A gutter that opens vertically upward is fixed to the lower end in the vertical direction of the partition wall 71, so that the water storage sections 72 are disposed on both sides of the partition wall 71. The water storage sections 72 are provided along the circumferential direction of the reactor containment vessel 12, similar to the partition wall 71.

[0045] Furthermore, the reactor containment vessel 12 is provided with a discharge section 73 that causes the condensed water stored in the water storage section 72 to flow in the radial direction and discharge the same. Similar to the water storage section 72, the discharge section 73 has a gutter shape at its vertical lower end with an opening at the vertical upper side. The discharge section 73 is disposed in the radial direction of the reactor containment vessel 12 and communicates with the multiple water storage sections 72. A plurality of discharge sections 73 may be provided at intervals in the circumferential direction of the reactor containment vessel 12.

[0046] Therefore, the multiple nozzles 34 provided in the header 32 inject the steam S, followed by the air A, toward the upper inner surface 12a of the reactor containment vessel 12, thereby removing the air A from the ceiling portion of the reactor containment vessel 12. When the steam S injected from the nozzles 34 directly collides with the upper inner surface 12a of the reactor containment vessel 12, the steam S is cooled and condensed by contacting the cooled upper inner surface 12a of the reactor containment vessel 12, and falls as water.

[0047] At this time, the nozzles 34 inject the steam S toward the upper inner surface 12a between the partition walls 71. The steam S then collides with the upper inner surface 12a and is cooled to become condensed water, which flows along each partition wall 71 and is received by each water storage section 72. The condensed water received in each water storage section 72 flows radially downward along the upper inner surface 12a of the reactor containment vessel 12 by the discharge section 73 and falls near the side wall. Therefore, the formation of a liquid film of the condensed water on the upper inner surface 12a of the reactor containment vessel 12 is suppressed. In addition, the condensed water of the steam S does not fall in the center of the reactor containment vessel 12, and contact between the rising steam S and the falling condensed water is suppressed, improving the condensation performance of the steam S.

[0048] As in the second embodiment, it is preferable to provide a water-repellent layer on the upper inner surface 12a of the reactor containment vessel 12, both sides of the partition wall 71, the water storage section 72, and the discharge section 73. The water-repellent layer suppresses the formation of a liquid film of condensed water.

[0049] [Fifth embodiment] 7 is a schematic front view showing a cooling device for a reactor containment vessel according to a fifth 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.

[0050] 7, the cooling device 14 includes a blower 81. The cooling device 14 may include a cooling water supply device 31, a header 32, and a gas introduction passage 33, as in the above-described embodiments.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] [Effects of this embodiment] The cooling device for the 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 header 32 that is arranged in a position facing the upper inner surface 12a of the reactor containment vessel 12 and has a nozzle 34 that can inject gas toward the upper inner surface 12a, and a gas introduction passage 33 that introduces gas inside the reactor 13 into the header 32 in the event of an accident in the reactor 13.

[0055] 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 header 32. At this time, first, the air (non-condensed gas) A of the reactor 13 is supplied to the header 32 and injected from the nozzle 34, and then the steam (condensed gas) S of the reactor 13 is supplied to the header 32 and injected from the nozzle 34. Here, the air A injected first accumulates in the ceiling part of the reactor containment vessel 12, but is diffused by the steam S injected subsequently. Therefore, the accumulation of the air A in the ceiling part of the reactor containment vessel 12 is suppressed. In addition, the steam S injected from the nozzle 34 directly collides with the upper inner surface 12a of the reactor containment vessel 12 cooled by the cooling water, and the steam S can be efficiently cooled and condensed. As a result, the cooling performance of the reactor containment vessel 12 can be improved.

[0056] 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 comprising a header 32 having a plurality of divided headers 51 arranged radially downward from the top of the reactor containment vessel 12, and a plurality of nozzles 34 are provided on the divided headers 51. This allows the steam S to be sprayed over a wide range of the ceiling portion of the reactor containment vessel 12 by the plurality of nozzles 34, and the steam S supplied to the ceiling portion of the reactor containment vessel 12 can be efficiently cooled and condensed by the cooling water.

[0057] 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, and further, the reactor containment vessel 12 is provided with a plurality of partition walls 71 spaced apart in the radial direction along the circumferential direction on the upper inner surface 12a. As a result, the steam S that collides with the upper inner surface 12a of the reactor containment vessel 12 is cooled to become condensed water, which flows along the partition walls 71, and therefore the formation of a liquid film of the condensed water on the upper inner surface 12a of the reactor containment vessel 12 is suppressed, and a decrease in the cooling performance of the steam S by the upper inner surface 12a can be suppressed.

[0058] The cooling device for a reactor containment vessel according to the fourth embodiment is the cooling device for a reactor containment vessel according to the third embodiment, and further includes a water reservoir 72 at a lower end in the vertical direction of the partition wall 71. As a result, the steam S that collides with the upper inner surface 12a of the reactor containment vessel 12 is cooled and becomes condensed water, which flows along the partition wall 71 and is received in the water reservoir 72, and contact between the rising steam S and the descending condensed water is suppressed, thereby improving the condensation performance of the steam S.

[0059] 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, and further includes a discharge section 73 that flows and discharges the water stored in the water storage section 72 along the radial direction of the reactor containment vessel 12. As a result, the condensed water received in the water storage section 72 flows radially downward along the upper inner surface 12a of the reactor containment vessel 12 by the discharge section 73 and is discharged near the side wall, so that the condensed water of the steam S does not fall at the center of the reactor containment vessel 12, and contact between the rising steam S and the falling condensed water is suppressed, thereby improving the condensation performance of the steam S.

[0060] A cooling device for a reactor containment vessel according to a sixth aspect is the cooling device for a reactor containment vessel according to any one of the first to fifth aspects, and further, the reactor containment vessel is provided with a water-repellent layer 61 on the upper inner surface 12a. As a result, the steam S sprayed from the nozzle 34 and colliding with the upper inner surface 12a of the reactor containment vessel 12 is cooled and condensed into water, but the provision of the water-repellent layer 61 on the upper inner surface 12a suppresses the formation of a liquid film due to the condensed water, and thus makes it possible to suppress a decrease in the cooling performance of the steam S by the upper inner surface 12a.

[0061] 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]

[0062] 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 Header 33 Gas introduction channel 34 Nozzle 41 Water Tank 42 Drainage Channel 43 On-off valve 44 Control device 45 Detector 51 Split Header 61 Water-repellent layer 71 Partition Wall 72 Water storage section 73 Discharge section 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 header having a nozzle disposed at a position facing an upper inner surface of the reactor containment vessel and configured to inject gas toward the upper inner surface; a gas introduction passage for introducing gas inside the reactor into the header in the event of an accident in the reactor; A reactor containment vessel cooling system comprising:

2. The header has a plurality of divided headers arranged radially downward from a top portion of the reactor containment vessel, and the nozzle is provided in a plurality of the divided headers. The cooling system for a nuclear reactor containment vessel according to claim 1.

3. The reactor containment vessel has a plurality of partition walls provided on the upper inner surface along a circumferential direction at intervals in a radial direction. The cooling system for a nuclear reactor containment vessel according to claim 2.

4. The partition wall has a water storage section at a lower end in a vertical direction. The cooling system for a nuclear reactor containment vessel according to claim 3.

5. A discharge section is provided to discharge the water stored in the water storage section by flowing it along a radial direction of the reactor containment vessel. The cooling system for a nuclear reactor containment vessel according to claim 4.

6. The reactor containment vessel has a water-repellent layer provided on the upper inner surface. The cooling system for a nuclear reactor containment vessel according to claim 1.

7. A blower is disposed at an upper portion of the interior of the reactor containment vessel and at an upper portion of the exterior of the reactor. The cooling system for a nuclear reactor containment vessel according to claim 1.

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