JP2017067557A - Reactor containment vessel cooling system and cooling method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling technology of a reactor containment vessel capable of supplying cooling water into the reactor containment vessel even without human assistance.SOLUTION: A reactor containment vessel cooling system 10 comprises: an injection pipe system 11 of which one opening end is positioned outside a reactor containment vessel 54 and inside a reactor building 51, and which guides sea water flowing from the opening end into the reactor containment vessel 54; a check valve 12 provided in the injection pipe system 11, and for restraining a flow of sea water in a direction from the inside of the reactor containment vessel 54 to the one opening end; a section immersion detection sensor 14 provided in an installation section 57 of a reactor core cooling device for supplying water to a reactor core, and for detecting water immersion in the installation section 57; a bypass pipe 15 provided so as to bypass a vent valve 62 for discharging steam from the reactor containment vessel 54; and a bypass valve 16 provided in the bypass pipe 15, and opened when water immersion is detected by the section immersion detection sensor 14.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a reactor containment vessel cooling technique.

Tsunami countermeasures at nuclear power plants include outer protective equipment that prevents tsunami inundation into the power plant site and inner protective equipment that prevents tsunami inundation into the power plant building.
To strengthen the tsunami countermeasures, for example, the seawalls that are the outer protection equipment are raised, and the outer wall doors of the reactor building and the building piping through-holes that are the inner protection equipment are watertight and closed. Water countermeasure work is being carried out.

  In addition, in case of tsunami inundation in the reactor building, core cooling such as providing a watertight door in the installation area of important equipment where dynamic equipment (for example, water injection pump) to maintain core cooling is installed Measures are taken to prevent loss of function.

  In addition, a method for injecting water into a nuclear reactor from a water tank installed on a high ground is also being studied in case the core cooling function of the dynamic equipment in the reactor building is lost. In this method, when an out-of-core cooling pool is installed at the outer bottom of the reactor pressure vessel and the core cooling function by dynamic equipment is lost, the water stored in the water storage tank is allowed to flow into the out-of-core cooling pool. By cooling the reactor pressure vessel, melting damage of the core is prevented.

JP 2014-1953 A

  By the way, in a probabilistic risk assessment caused by a large-scale tsunami in recent years, a large amount of water was flooded into the building site due to a tsunami that overwhelmed the seawall, and the inundation path was higher than the expected height of the inner protective equipment. It has been pointed out that there is a risk that an unexpected situation may occur if a large-scale tsunami occurs, such as flooding into a building or flooding from a watertight door in an accidentally opened reactor building.

  When such a situation occurs, a situation that exceeds the assumption of water stoppage countermeasures in the building, such as the flooding of the ground floor from the basement floor of the reactor building, has occurred. All devices can lose function.

  In this case, access to the reactor building becomes difficult, and even if cooling water is injected into the reactor core from a water tank installed outside the reactor building, it takes time to prepare piping connection for water injection. Furthermore, there is a possibility that the valve cannot be opened when the external power source is lost. In addition, it is assumed that the water tank itself will be washed away by the tsunami.

  If water injection into the reactor core is delayed, the reactor core may be damaged, and if the inside of the reactor containment vessel cannot be cooled, the reactor containment vessel will be damaged by the molten reactor core, and a large amount of radioactive material will be generated. There is a risk of being released outside the reactor containment vessel. For this reason, it is necessary to take measures to stop the progress of the accident at some point.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a reactor containment vessel cooling technique capable of injecting cooling water into the reactor containment vessel without human assistance.

  In the reactor containment vessel cooling system according to the embodiment of the present invention, one open end is disposed outside the reactor containment vessel and inside the reactor building, and seawater flowing from the open end is supplied to the reactor containment vessel. An injection piping system that guides the inside of the reactor, a check valve that is provided in the injection piping system and regulates the flow of the seawater in the direction from the inside of the reactor containment vessel to the one open end, and the core Provided in the installation section of the core cooling device for supplying water, bypassing the section inundation detection sensor for detecting inundation in the installation section and the vent valve for discharging the steam of the reactor containment vessel And a bypass valve that is provided in the bypass pipe and is opened when water is detected by the partition water detection sensor.

  In the reactor containment vessel cooling method according to the embodiment of the present invention, one open end flows from the open end using an injection piping system disposed outside the reactor containment vessel and inside the reactor building. Guiding the seawater into the reactor containment vessel; regulating the flow of the seawater in the direction from the interior of the reactor containment vessel to the one open end of the injection piping system; A step of detecting inundation in the installation section with a section inundation detection sensor provided in the installation section of the core cooling device for supplying water, and a detour for bypassing the vent valve for discharging the steam of the reactor containment vessel Opening a bypass valve provided in the pipe when water is detected by the section water detection sensor.

  The embodiment of the present invention provides a cooling technique for a reactor containment vessel that can inject cooling water into the reactor containment vessel without human assistance.

1 is a configuration diagram of a nuclear power plant to which a reactor containment cooling system according to a first embodiment is applied. FIG. The figure explaining the cooling operation of the reactor containment when the dynamic cooling function is lost in the reactor containment cooling system according to the present embodiment. The block diagram which shows the modification of the cooling system of the reactor containment vessel which concerns on 1st Embodiment. The block diagram which shows the modification of the cooling system of the reactor containment vessel which concerns on 1st Embodiment. The block diagram of the nuclear power plant to which the cooling system of the reactor containment vessel which concerns on 2nd Embodiment was applied. The block diagram which shows the modification of the cooling system of the reactor containment vessel which concerns on 2nd Embodiment. The block diagram of the nuclear power plant to which the cooling system of the reactor containment vessel which concerns on 3rd Embodiment was applied. The block diagram of the nuclear power plant to which the cooling system of the reactor containment vessel which concerns on 4th Embodiment was applied. The block diagram which shows the modification of the cooling system of the reactor containment vessel which concerns on 4th Embodiment. The block diagram which shows the modification of the cooling system of the reactor containment vessel which concerns on 4th Embodiment.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a configuration diagram of a nuclear power plant 50 to which a cooling system 10 (hereinafter, abbreviated as a cooling system 10) of a reactor containment vessel 54 according to the first embodiment is applied. Here, a case where the present invention is applied to a boiling water nuclear power plant (BWR) will be described as an example. Reference numeral 65 indicates a part of the floor on the ground floor in the reactor building.

First, a general tsunami countermeasure facility in the nuclear power plant 50 will be described.
The nuclear power plant 50 includes a tide embankment 52 provided outside the reactor building 51 to prevent the progress of the tsunami in the direction of the reactor building 51 when a tsunami occurs due to an earthquake, and an atom to prevent the intrusion of seawater. And an outer wall watertight door 53 provided in the furnace building 51.

  The reactor building 51 is provided with a core cooling device installation section 57 having a cooling pump 58 therein. The cooling pump 58 injects cooling water into the reactor pressure vessel 56 through the core cooling pipe 59 in an emergency such as when the circulation tower of the cooling water is damaged by an earthquake or a tsunami is inundated in the building. This is a core cooling device for maintaining the core cooling. A partition watertight door 60 is installed at the entrance of the core cooling device installation section 57 to prevent water from entering the section.

  The vent pipe 61 is a pipe whose one open end is opened inside the reactor containment vessel 54 and guides the steam inside the containment vessel to the exhaust tower 64 installed in the outdoor part of the building. The filter equipment 63 has an adsorption filter that adsorbs particulate radioactive materials (such as cesium). The filter facility 63 is installed on a steam discharge line guided to the exhaust tower 64 by the vent pipe 61, and adsorbs and removes radioactive substances contained in the discharged steam.

  The vent valve 62 is provided in the vent pipe 61. The vent valve 62 is normally closed, and is released from the closed state by an operation of a security worker in an emergency. By opening the vent valve 62, the steam inside the containment vessel is discharged to the outside from the exhaust tower 64, and the inside of the reactor containment vessel 54 is decompressed.

  Thus, in a general nuclear power plant 50, in an emergency, the vent valve 62 is opened to depressurize the reactor containment vessel 54, and cooling water is injected from the cooling pump 58 into the reactor pressure vessel 56. This maintains the cooling function.

  On the other hand, the cooling system 10 according to the present embodiment loses the cooling function by the dynamic core cooling device (cooling pump 58) due to a large amount of flooding into the reactor building 51 caused by the tsunami, and causes severe core damage. A system that cools the inside of the containment vessel 54 by depressurizing the containment vessel 54 and injecting seawater into the containment vessel without the need for human assistance when there is a possibility of an accident. It is.

  The cooling system 10 according to the first embodiment includes an injection piping system 11, a compartment water intrusion detection sensor 14, a bypass piping 15, and a bypass valve 16.

  In the injection piping system 11, one open end (seawater inlet 27) is disposed outside the reactor containment vessel 54 and inside the reactor building 51, and extends toward the reactor containment vessel 54. The other open end (seawater outlet 28) is opened to the lower part of the pedestal 55 by being inserted into and inserted into the reactor containment vessel 54.

  One open end (inlet 27) is disposed at a position higher than the other open end (outlet 28), and seawater that has flowed into the injection piping system 11 flows through the inside of the piping and enters the reactor containment vessel. 54 is guided inside. One open end (inlet 27) is preferably arranged in a place where seawater tends to stay when the reactor building 51 is flooded in large quantities. For example, it is arranged near the ground floor 65 as shown in FIG. Is done.

  The injection piping system 11 includes a check valve 12 and a first injection valve 13. Both the check valve 12 and the first injection valve 13 are provided outside the reactor containment vessel 54. FIG. 1 shows an example of the arrangement of the check valve 12 and the first injection valve 13, and the arrangement of these valves is not limited to the positions shown in FIG.

  The check valve 12 is a valve that regulates the flow of seawater in the direction from the inside of the reactor containment vessel 54 to the inlet 27 of the injection piping system 11. Since the check valve 12 is opened only when seawater flows toward the inside of the reactor containment vessel 54, the atmosphere of the containment vessel and the outside air do not communicate with each other. Release to the outside of the reactor containment vessel 54 is prevented.

  The first injection valve 13 is a valve that is opened by the head of seawater flowing inside the injection piping system 11. The injection pipe system 11 is opened only when seawater flows in the pipe by the first injection valve 13, so that the steam containing the radioactive substance in the containment vessel is stored in the reactor, as in the effect of providing the check valve 12. Release to the outside of the container 54 is prevented.

  The weir 17 is formed so as to cover the periphery of the opening end of the injection piping system 11 into which the seawater flows, and holds the seawater inside. When the tsunami begins to draw, the seawater that has been submerged in the interior of the building will rapidly begin to be drawn outside the building, but the seawater is held inside for a certain time by the weir 17. For this reason, when the tsunami pulls, the fall of the rapid water injection amount can be suppressed.

  The compartment inundation detection sensor 14 is a sensor for inundation detection that detects inundation in the core cooling equipment installation section 57 and is installed in the core cooling equipment installation section 57. The section inundation detection sensor 14 transmits an inundation detection signal s to the bypass valve 16 when inundation in the core cooling device installation section 57 is detected.

  In addition, it is desirable that the periphery in the horizontal direction of the compartment water intrusion detection sensor 14 is covered with a wall for preventing scattering of water from the horizontal direction. By providing a wall around the compartment inundation detection sensor 14, it is possible to prevent the sensor from being driven by an event other than inundation due to a tsunami such as pipe breakage.

  The bypass pipe 15 is a pipe provided by bypassing the vent valve 62 for discharging the steam of the reactor containment vessel 54.

  The bypass valve 16 is provided in the bypass pipe 15 and is opened when the submersion detection sensor 14 detects inundation. Specifically, the bypass valve 16 is always excited and closed, and when receiving the inundation detection signal s from the section inundation detection sensor 14, the excitation is turned off and the detour valve 16 is opened.

  By opening the bypass valve 16, the steam in the reactor containment vessel 54 is discharged to the outside through the bypass piping 15 and the vent piping 61, and the inside of the reactor containment vessel 54 is decompressed.

  The cooling operation in the cooling system 10 according to the present embodiment will be described with reference to FIG. Here, a case is considered in which a large amount of the interior of the building is flooded by the tsunami that has flowed into the reactor building 51, and further, the core cooling device installation section 57 is also flooded and the cooling pump 58 cannot be driven.

  When the inside of the core cooling device installation section 57 is flooded, the section flooding detection sensor 14 detects the flooding in the section and outputs the flooding detection signal s to the bypass valve 16. The bypass valve 16 is opened when receiving the inundation detection signal s. When the bypass valve 16 is opened, the steam in the reactor containment vessel 54 is discharged to the outside through the bypass pipe 15. Thereby, the inside of the reactor containment vessel 54 is depressurized.

  On the other hand, a large amount of seawater stays on the ground floor 65 due to the large amount of water in the building. This seawater flows from the inlet 27 into the injection piping system 11. When seawater flows in and seawater flows toward the inside of the reactor containment vessel 54, the regulation by the check valve 12 does not work and it flows.

  Further, the first injection valve 13 is opened by the head of the flowing seawater, and the seawater is guided to the lower part of the pedestal 55. Thereby, the inside of the reactor containment vessel 54 is cooled by seawater.

  In addition, since the seawater is held inside by the weir 17 for a certain period of time, when the tsunami is pulled, a rapid decrease in the water injection amount is suppressed.

  As described above, when the inside of the building is inundated, the reactor containment vessel 54 is decompressed by the bypass valve 16 provided by bypassing the vent valve 62, and generated by the inundation from the injection piping system 11 having an open end in the building. Seawater is poured into the reactor containment vessel 54.

  As a result, even if a core damage event occurs due to the loss of the function of the dynamic cooling equipment due to the large amount of water in the reactor building 51, the cooling water injection line and the pressure discharge line to the reactor containment vessel 54 are generated. Therefore, the reactor containment vessel 54 can be cooled. Since all the seawater injections are performed without the need for human assistance, the reactor containment vessel 54 can be cooled even in an unattended state after an indoor worker evacuates due to a large tsunami.

  In addition, seawater injection into the reactor containment vessel 54 is continued during a period in which seawater remains in the vicinity of the ground floor floor 65, that is, a period in which access to the reactor building 51 is difficult due to a tsunami.

  Further, since the inside and outside of the reactor containment vessel 54 do not communicate with each other by the check valve 12 and the first injection valve 13, the release of radioactive material from the inside of the reactor containment vessel 54 is prevented.

  Furthermore, since seawater flooded by the tsunami is used as a water source, there is no need for a water source such as an outdoor pool outside the reactor building 51, so there is no risk of water source loss due to the tsunami, and the seawater inlet 27 is located in the reactor building. Since it is provided inside 51, the possibility of damage due to drifting objects is reduced.

  FIG. 3 shows a modification of the cooling system 10 for the reactor containment vessel 54 according to the first embodiment. Here, it is assumed that a pedestal lower water injection pipe 66 for supplying cooling water to the lower portion of the reactor containment vessel 54 in an emergency is already installed. The check valve 67 is a valve that regulates the flow of cooling water from the inside of the reactor containment vessel 54 toward the outside of the reactor building 51.

  In this modification, the other open end (seawater outflow side) of the injection piping system 11 is connected to the pedestal lower water injection piping 66. Seawater flowing in from the inlet 27 is guided into the reactor containment vessel 54 through the injection piping system 11 and the pedestal lower water injection piping 66.

  By introducing seawater into the reactor containment vessel 54 using the existing pedestal lower water injection pipe 66, the reactor containment vessel 54 can be cooled without opening any through holes for piping in the reactor containment vessel 54. Can be implemented.

  FIG. 4 shows a modification of the cooling system 10 for the reactor containment vessel 54 according to the first embodiment.

  In this modification, the seawater inlet 27 of the injection piping system 11 has a U-shaped pipe structure. Since the inlet 27 has a U-shaped tube structure, even if the inlet 27 is exposed to the outside air after a tsunami that has been submerged in the reactor building 51 is drawn, the seawater stored in the U-shaped tube causes the reactor to The inside and outside of the storage container 54 can be separated.

(Second Embodiment)
FIG. 5 shows a configuration diagram of the cooling system 10 of the reactor containment vessel 54 according to the second embodiment. In FIG. 5, parts having the same configuration or function as those of the first embodiment (FIG. 1) are denoted by the same reference numerals, and redundant description is omitted.

  The second embodiment is different from the first embodiment in that a water storage tank 18 is further provided inside the reactor containment vessel 54.

  The water storage tank 18 is provided with its upper part opened inside the reactor containment vessel 54, and the other open end (seawater outlet 28) of the injection piping system 11 is inserted below the storage tank. .

  Seawater that flows in from the inlet 27 of the injection piping system 11 is injected into the water storage tank 18 from the outlet 28. When the water level rises to the upper part of the open water storage tank 18, the seawater overflows into the reactor containment vessel 54 and floods the floor surface of the reactor containment vessel 54.

  And even if a tsunami pulls and the water level in a building falls and the inlet 27 of the injection piping system 11 is exposed in the gas phase, the outlet 28 of the injection piping system 11 is held in the water in the water storage tank 18. . For this reason, the inside and outside of the storage container are isolated by the stored water in the water storage tank 18.

  Therefore, since the inside and outside of the reactor containment vessel 54 do not communicate with each other, the release of radioactive materials from the inside of the reactor containment vessel 54 is more reliably prevented. Moreover, since the water storage tank 18 is installed in the storage container, it is not necessary to make the container airtight, and the installation configuration can be simplified.

  FIG. 6 shows a modification of the cooling system 10 for the reactor containment vessel 54 according to the second embodiment.

  In the present modification, the injection piping system 11 is further provided with a lower injection piping 19 having a siphon structure. The lower injection pipe 19 has one open end inserted into the lower part of the water storage tank 18 and the other open end opened at the lower part of the pedestal 55, and seawater stored in the water storage tank 18 is stored in the pedestal 55. Guide down below.

  The seawater in the water storage tank is guided below the pedestal 55 via the lower injection pipe 19 so that water injection to the lower part of the reactor pressure vessel 56 where the core melt is likely to exist is given priority. Since it can be performed, the core melt can be cooled more reliably.

(Third embodiment)
FIG. 7 shows a configuration diagram of the cooling system 10 of the reactor containment vessel 54 according to the third embodiment. In FIG. 7, parts having the same configuration or function as those of the second embodiment (FIG. 5) are denoted by the same reference numerals, and redundant description is omitted.

  The third embodiment is different from the second embodiment in that a pipe intrusion detection sensor 20 and a second injection valve 21 are further provided.

  The pipe flooding detection sensor 20 is a sensor that is disposed in the vicinity of the injection piping system 11 through which seawater flows, and detects the flooding of the injection piping system 11. Then, a pipe flood detection signal t is transmitted to the second injection valve 21 when the flood of the injection pipe system 11 is detected.

  Further, the section inundation detection sensor 14 transmits the inundation detection signal s together with the bypass valve 16 to the second injection valve 21 when inundation in the core cooling device installation section 57 is detected.

  The second injection valve 21 is provided in the injection piping system 11 outside the reactor containment vessel 54, and when the inundation is detected by the section inundation detection sensor 14 and the inundation is detected by the pipe infiltration detection sensor 20. Opened. Specifically, the second injection valve 21 is always excited and closed, receives the inundation detection signal s from the compartment inundation detection sensor 14, and receives the pipe inundation detection signal t from the pipe inundation detection sensor 20. Sometimes the excitation is cut off and it is released.

  When the second injection valve 21 is opened, the seawater flowing from the injection piping system 11 is guided into the containment vessel. On the other hand, the bypass valve 16 that has received the inundation detection signal s is opened, and the pressure in the storage container is reduced.

  In this way, when the inundation of the injection piping system 11 is detected by the piping intrusion detection sensor 20, and the infiltration of the cooling system equipment installation section sensor and the injection piping system 11 is detected, the second injection valve 21 is opened, The cooling operation of the reactor containment vessel 54 can be executed when it is reliably detected that the building has been flooded in large quantities.

(Fourth embodiment)
FIG. 8 shows a configuration diagram of the cooling system 10 of the reactor containment vessel 54 according to the third embodiment. In FIG. 8, parts having the same configuration or function as those of the first embodiment (FIG. 1) are denoted by the same reference numerals, and redundant description is omitted.

  The fourth embodiment is different from the first embodiment in that the injection piping system 11 includes a first injection piping 23, a watertight container 24, and a second injection piping 25. FIG. 8 shows a configuration in which the watertight vessel 24 is arranged outside the reactor containment vessel 54, and FIG. 9 shows a configuration in which the watertight vessel 24 is arranged inside the reactor containment vessel 54. Yes.

  The watertight container 24 is a container for temporarily storing seawater that has flowed into the first injection pipe 23, and the inside thereof is hermetically sealed to prevent diffusion of radioactive substances to the outside.

  One open end of the first injection pipe 23 is disposed outside the reactor containment vessel 54, and the other open end is inserted below the watertight vessel 24. Seawater flowing into the first injection pipe 23 is stored in the watertight container 24.

  The second injection pipe 25 has one open end connected to the upper part of the watertight vessel 24 and the other open end opened at the lower part of the reactor containment vessel 54. Seawater that reaches the connection port between the watertight container 24 and the second injection pipe 25 as the water level of the watertight container 24 rises is guided to the lower part of the reactor containment vessel 54 through the second injection pipe 25. . The check valve 26 is provided in the second injection pipe 25 to prevent communication between the inside and outside of the containment vessel.

  Even when a tsunami pulls and the water level in the building falls and the inlet 27 of the first injection pipe 23 is exposed in the gas phase, the outlet of the first injection pipe 23 is held in the water in the water storage tank 18. Therefore, the inside and outside of the storage container are isolated by the stored water in the watertight container 24.

  In this way, the injection pipe through which seawater flows is separated into the first injection pipe 23 and the second injection pipe 25, and the watertight container 24 is provided between them, so that the atmospheric gas in the reactor containment vessel 54 is injected into the injection pipe. It can be surely prevented from being released through.

  FIG. 10 is a configuration diagram illustrating a modification of the cooling system 10 according to the fourth embodiment. Here, similarly to the embodiment shown in FIG. 3, it is assumed that a pedestal lower water injection pipe 66 for supplying cooling water to the lower portion of the reactor containment vessel 54 in an emergency is already provided.

  In this modification, the watertight container 24 is provided outside the reactor containment vessel 54, and the other open end of the second injection pipe 25 is connected to the pedestal lower water injection pipe 66. Seawater flowing in from the inlet 27 of the first injection pipe 23 is guided into the reactor containment vessel 54 through the injection pipe system 11 and the pedestal lower water injection pipe 66.

  In this way, by introducing seawater into the reactor containment vessel 54 using the existing pedestal lower water injection pipe 66, the reactor containment vessel 54 can be opened without opening through holes for extra piping in the reactor containment vessel 54. 54 cooling can be performed.

  According to the reactor containment vessel cooling system of each embodiment described above, the reactor containment vessel is depressurized by a bypass valve that bypasses the vent valve during flooding, while the water injection pipe having an open end in the building Injecting seawater generated by inundation from the grid into the reactor containment vessel makes it difficult for people to enter the reactor containment vessel without human assistance even in the situation where a large amount of water is flooded in the building due to the tsunami. Cooling water can be poured into

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. For example, the configurations from the first embodiment (FIG. 1) to the fourth embodiment (FIG. 10) can be combined. Moreover, although the case where it applied to a boiling water nuclear power plant was shown as an example, this embodiment can also be applied to a pressurized water nuclear power plant (PWR).

  DESCRIPTION OF SYMBOLS 10 ... Reactor containment cooling system, 11 ... Injection piping system, 12 ... Check valve, 13 ... First injection valve, 14 ... Infiltration detection sensor in compartment, 15 ... Detour piping, 16 ... Detour valve, 17 ... Weir , 18 ... Water storage container, 19 ... Lower injection pipe, 20 ... Pipe inundation detection sensor, 21 ... Second injection valve, 23 ... First injection pipe, 24 ... Watertight container, 25 ... Second injection pipe, 26 ... Reverse Stop valve, 27 ... Inlet, 28 ... Outlet, 50 ... Nuclear power plant, 51 ... Reactor building, 52 ... Seawall, 53 ... Outer wall watertight door, 54 ... Reactor containment vessel, 55 ... Pedestal, 56 ... Atom Reactor pressure vessel, 57 ... installation section for core cooling equipment, 58 ... cooling pump (core cooling equipment), 59 ... core cooling piping, 60 ... compartment watertight door, 61 ... vent piping, 62 ... vent valve, 63 ... filter equipment 64 ... Exhaust tower, 65 ... Building floor, 66 ... Desutaru lower water injection pipe, 67 ... check valve, s ... compartment flooding detection signal, t ... injection pipe flooding detection signal.

Claims (9)

One open end is disposed outside the reactor containment vessel and inside the reactor building, and an injection piping system that guides the seawater flowing from the open end to the inside of the reactor containment vessel,
A check valve provided in the injection piping system for regulating the flow of the seawater in the direction from the inside of the reactor containment vessel to the one open end;
A section inundation detection sensor that is provided in an installation section of core cooling equipment that supplies water to the core and detects inundation in the installation section;
A bypass pipe provided to bypass a vent valve for discharging the steam of the reactor containment vessel;
A reactor containment vessel cooling system, comprising: a bypass valve provided in the bypass pipe and opened when water is detected by the compartment water detection sensor.   2. The reactor containment vessel cooling according to claim 1, further comprising a first injection valve provided in the injection piping system and opened by a head of the seawater flowing inside the injection piping system. system.   The injection pipe system has the other open end connected to a pedestal lower water injection pipe for supplying water to the inside of the reactor containment vessel, and the seawater introduced through the pedestal lower water injection pipe is stored in the reactor. The reactor containment vessel cooling system according to claim 1, wherein the reactor containment vessel is guided inside the vessel.   The apparatus further comprises a water storage container provided with an upper part opened inside the reactor containment vessel and into which the other open end of the injection piping system is inserted to inject the seawater. 4. The reactor containment vessel cooling system according to claim 3. The injection piping system is
A first injection pipe provided on the one opening end side;
A watertight container connected to the first injection pipe and storing the seawater introduced from the one open end;
A second injection pipe connected to the upper part of the watertight vessel and guiding the seawater stored in the watertight vessel to the inside of the reactor containment vessel,
The check valve is provided in the middle of the first injection pipe so as to regulate the flow of the seawater in the direction from the inside of the watertight container to the one open end. The reactor containment vessel cooling system according to claim 4. The watertight vessel is provided outside the reactor containment vessel,
In the second injection pipe, the other open end is connected to a pedestal lower water injection pipe for supplying water into the reactor containment vessel, and the seawater stored through the pedestal lower water injection pipe is supplied to the reactor. The reactor containment vessel cooling system according to claim 5, wherein the reactor vessel is guided to the inside of the containment vessel.   2. The water supply apparatus according to claim 1, further comprising a weir that is formed so as to cover the periphery of the one opening end of the injection piping system through which the seawater flows, and holds the seawater inside. The reactor containment vessel cooling system according to claim 6. An infusion pipe inundation detection sensor that is disposed in the vicinity of the infusion pipe system for flowing in the seawater and detects inundation of the infusion pipe system;
A second injection valve provided in the injection piping system and opened when the inundation detection sensor detects inundation and the infusion piping infiltration detection sensor detects inundation; The reactor containment vessel cooling system according to any one of claims 1 to 7. A step of guiding the seawater flowing from the open end to the inside of the reactor containment vessel using an injection piping system in which one open end is arranged outside the reactor containment vessel and inside the reactor building;
Regulating the flow of the seawater in the direction from the inside of the reactor containment vessel to the one open end of the injection piping system;
A step of detecting inundation in the installation section with a section inundation detection sensor provided in the installation section of the core cooling device for supplying water to the core; and
Opening a bypass valve provided in a bypass pipe that bypasses a vent valve for discharging the steam of the containment vessel when the inundation is detected by the compartment inundation detection sensor. Reactor containment vessel cooling method.

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