JP7340654B2 - Nuclear power plant fire extinguishing system - Google Patents

Description

The present invention relates to a fire extinguishing system for a nuclear power plant.

Conventionally, a wet sprinkler is disclosed in Japanese Patent No. 3264939.

Patent No. 3264939

Conventional sprinkler systems have a problem in that when a sprinkler head malfunctions, water is sprayed from the sprinkler head.

A fire extinguishing system at a nuclear power plant has a sprinkler head and sprinkler piping for supplying water to the sprinkler head, and is a negative pressure sprinkler system in which the sprinkler piping is normally maintained in a negative pressure state, and a sprinkler system. Negative pressure piping connected to the sprinkler piping, a negative pressure device that can supply negative pressure to the sprinkler piping and the negative pressure piping, and a tank that supplies water to the sprinkler piping and is located higher than the sprinkler head. Equipped with.

Note that "normal state" refers to a normal state and a state in which no fire occurs. A nuclear power plant is a facility that uses the energy produced by nuclear transmutation to generate electricity.

In the fire extinguishing system of a nuclear power plant configured in this way, the sprinkler piping is normally maintained in a negative pressure state, so there is less water in the sprinkler piping than when it is filled with pressurized air. Since the tank can be filled quickly, water can be discharged quickly. The tank is located higher than the sprinkler head, so even if the pump that supplies water from the tank to the sprinkler head stops, gravity will continue to supply water from the tank to the sprinkler head, preventing power loss. Water can be sprayed from the sprinkler head even at times. Note that the negative pressure state refers to a state lower than normal pressure (1 atmosphere). Liquid may be present in the sprinkler piping as long as it is under negative pressure.

1 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to Embodiment 1. FIG. FIG. 3 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a third embodiment. FIG. 7 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a fourth embodiment. FIG. 7 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a fifth embodiment. FIG. 7 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a sixth embodiment.

(Embodiment 1)
(Configuration of nuclear power plant fire extinguishing system)
FIG. 1 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a first embodiment. As shown in FIG. 1, a fire extinguishing system 1 for a nuclear power plant is installed in a building 10 of a nuclear power plant. The building 10 has a first section 11 that is a lower floor and a second section that is an upper floor.

The negative pressure sprinkler system 100 includes a primary pipe 101, a secondary pipe 102 connected to the primary pipe 101, a sprinkler head 103 provided on the secondary pipe 102, and a boundary between the primary pipe 101 and the secondary pipe 102. It has a valve 105 provided and a water pump 106 for delivering water to the primary pipe 101.

The primary pipe 101 is filled with water. This water is pressurized by a water pump 106. The water pump 106 is supplied with water from a fire extinguishing water tank (not shown). Water may be supplied to the water pump 106 from an elevated water tank on the top floor of the building 10.

The primary pipe 101 rises vertically from the water pump 106 to the top of the building 10, and branches at each floor. Although this embodiment describes a two-story building 10, the floor of the building 10 is not limited to the second floor.

The water in the primary pipe 101 is stopped by a valve 105, and when the valve 105 opens, the water in the primary pipe 101 is sent to the secondary pipe 102. Opening and closing of valve 105 is controlled by computer 302.

Secondary pipe 102 is connected to valve 105. Secondary piping 102 is arranged in second compartment 12 . Note that although this embodiment shows an example in which the valve 105 is arranged in the second section 12, the valve 105 may be arranged in the first section 11.

The secondary pipe 102 is arranged on the ceiling of the second compartment 12. A plurality of sprinkler heads 103 are provided in the secondary pipe 102. The number of sprinkler heads 103 is determined by the width of the second section 12.

Although this embodiment shows an example in which the sprinkler head 103 is provided in the second section 12, the secondary pipe 102 and the sprinkler head 103 may be arranged in the first section 11.

The sprinkler head 103 is a closed type sprinkler head, and is provided with a plurality of holes for discharging water. The sprinkler head 103 has a heat sensitive mechanism (fusible metal piece). Under normal conditions, the space between the hole through which water is discharged and the primary pipe 101 is shielded within the sprinkler head 103 . When the heat-sensitive mechanism is melted by the flames of a fire, the shutoff is released. The valve 105 is opened and water is discharged from the holes in the sprinkler head 103 via the primary pipe 101 and the secondary pipe 102.

The negative pressure system 200 includes a negative pressure pipe 201, an inlet 203 that is provided in the negative pressure pipe 201 and makes the inside of the building 10 a negative pressure, and a first negative pressure pump 204 that makes the inside of the negative pressure pipe 201 a negative pressure. , a connecting pipe 205 that connects the negative pressure pipe 201 and the secondary pipe 102. A negative pressure sprinkler system can be realized by simply providing a connecting pipe 205 in the compartment and connecting the negative pressure pipe 201 and the secondary pipe 102.

A first negative pressure pump 204 is provided in the first compartment 11 to generate negative pressure. The first negative pressure pump 204 is constituted by a negative pressure pump. In this embodiment, the water pump 106 and the first negative pressure pump 204 are installed in the same first compartment 11, but they may be installed in different compartments.

A negative pressure pipe 201 connected to the first negative pressure pump 204 rises vertically from the first negative pressure pump 204 to the top floor of the building 10, and branches at each floor. Negative pressure piping 201 branches on each floor, and negative pressure piping 201 extends around each room. A second negative pressure pump 214 is connected to the negative pressure piping 201. When the first negative pressure pump 204 is stopped, for example, during maintenance, negative pressure can be supplied to the negative pressure piping 201 using the second negative pressure pump 214. A fire extinguishing system 1 of a nuclear power plant includes a secondary pipe 102 as a sprinkler pipe, a first negative pressure pump 204 as a first negative pressure device for supplying negative pressure to a negative pressure pipe 201, and a negative pressure pipe 201. A second negative pressure pump 214 is provided as a second negative pressure device for supplying negative pressure. Note that in this embodiment, two negative pressure pumps, the first negative pressure pump 204 and the second negative pressure pump, are provided, but it is sufficient that at least the first negative pressure pump 204 is provided.

The building 10 of the nuclear power plant has the function of confining radioactive materials in the event of an accident. Therefore, the building 10 is designed to maintain a negative pressure at all times. For example, entrances and exits have double doors to maintain negative pressure in the building. In this embodiment, air inside the building 10 is sucked in through the suction port 203 to create a negative pressure inside the building 10 . Either the first negative pressure pump 204 or the second negative pressure pump 214 may be used as the vacuum pump for maintaining the inside of the building 10 at negative pressure in this manner. The suction port 203 for creating a negative pressure inside the building 10 may be provided outside the connecting pipe 205. Since the connecting pipe 205 has an inner diameter necessary to create a negative pressure in the secondary pipe 102, it may not be possible to secure the capacity to create a negative pressure in the building 10. Therefore, by providing a pipe separate from the connecting pipe 205, connecting this pipe to at least one of the first negative pressure pump 204 and the second negative pressure pump 214, and providing the suction port 203 in this pipe, the inside of the building 10 can be It is possible to create a negative pressure.

The negative pressure pipe 201 and the secondary pipe 102 are connected by a connecting pipe 205. The connecting pipe 205 and the secondary pipe 102 are connected at a connecting point 202. Thereby, under normal conditions, the inside of the secondary pipe 102 is kept under negative pressure.

Under normal conditions, the inside of the secondary pipe 102 is under negative pressure and no water is present. By creating a negative pressure, it is possible to prevent water from remaining in the secondary pipe 102. Even if water were to remain in the secondary pipe 102, the boiling point of the water would be low under negative pressure. Therefore, the water in the secondary pipe 102 boils and is sucked by the first negative pressure pump 204 via the connecting pipe 205.

Detection system 300 includes a fire detector 301 and a computer 302. When a fire occurs within the second compartment 12, the fire detector 301 detects the heat or smoke. The computer 302 and the valve 105 are connected by a signal line 311. Computer 302 and water pump 106 are connected by signal line 312.

An additional pipe 402 is connected to the primary pipe 101 . Additional piping 402 is connected to tank 401. Water is stored in the tank 401. The direction indicated by an arrow 403 is an upward direction in the vertical direction, and the tank 401 is located above the sprinkler head 103 in the vertical direction.

Even if the water pump 106 fails, if the valve 105 is opened, water in the tank 401 will flow into the secondary pipe 102 via the additional pipe 402 due to the action of gravity, and water will be discharged from the sprinkler head 103.

When the water pump 106 is activated, the water pressure of the water pump 106 is applied to the water in the primary piping 101, and the water in the primary piping 101 may flow into the additional piping 402. Therefore, the tank 401 should be raised high and the water in the primary piping 101 Preventing water from flowing into additional piping 402. Alternatively, by providing a check valve in the additional pipe 402, the flow of water from the primary pipe 101 to the additional pipe 402 can be prevented.

Although the additional piping 402 is provided outside the building 10 in this embodiment, the additional piping 402 may be provided inside the building 10. In this case, freezing of the water in the additional pipe 402 can be prevented.

The tank 401 may be provided within the building 10 or may be provided outside the building 10. When the tank 401 is provided inside the building 10, all of the additional piping 402 can be provided inside the building 10. As a result, additional piping 402 can be protected. Further, the building 10 shakes during an earthquake, but since the period of shaking of the building 10 and the period of shaking of the water in the tank 401 are different, it is possible to attenuate the shaking of the building 10.

An antenna 410 is connected to the computer 302. Antenna 410 can receive information related to disasters, such as information related to earthquakes. For example, since earthquake early warnings can be obtained from a receiving terminal as well as from television, radio, mobile phones, etc., the antenna 410 is configured to receive emergency earthquake early warnings. Information on disasters includes information on tsunamis, tornadoes, and hijackings. These are provided as disaster information by, for example, the Japan Meteorological Agency, the Ministry of Land, Infrastructure, Transport and Tourism, and the National Police Agency.

Computer 302 can control the output of water pump 106 and first vacuum pump 204 and second vacuum pump 214. When the antenna 410 receives earthquake information, the computer 302 increases the output of at least one of the first negative pressure pump 204 and the second negative pressure pump 214. In other words, there is a high possibility that a fire will occur within the building 10 after an earthquake. The lower the pressure in the secondary pipe 102, the faster the secondary pipe 102 is filled with water. Therefore, by increasing the output of at least one of the first negative pressure pump 204 and the second negative pressure pump to increase the degree of vacuum in the secondary pipe 102 (lower the pressure in the secondary pipe 102), a fire can be prevented. If this occurs, the secondary pipe 102 can be immediately filled with water.

Further, after an earthquake, the first negative pressure pump 204 and the second negative pressure pump 214 may not be driven due to power loss or the like. In this case, the pressure inside the secondary pipe 102 gradually increases and eventually reaches atmospheric pressure. The time it takes for the pressure in the secondary pipe 102 to reach atmospheric pressure is related to the pressure in the secondary pipe 102 when the first negative pressure pump 204 and the second negative pressure pump 214 are no longer driven. The lower the pressure in the secondary piping 102 when the first negative pressure pump 204 and the second negative pressure pump 214 stop driving, the longer it will take for the pressure in the secondary piping 102 to reach atmospheric pressure after power loss. It takes longer.

Since the seismic intensity of the building 10 changes depending on the magnitude of the earthquake and the distance from the epicenter to the building 10 of the nuclear power plant, the first negative pressure pump 204 and the second negative pressure Change the output of pump 214. As an example, it is possible to change the output of the first negative pressure pump and the second negative pressure pump based on a table as shown below.

In Table 1, "A" indicates that the outputs of the first negative pressure pump 204 and the second negative pressure pump 214 are maximum. "B" indicates that the output of the first negative pressure pump 204 and the second negative pressure pump 214 is moderate. "C" indicates that the outputs of the first negative pressure pump 204 and the second negative pressure pump 214 are greater than before receiving the disaster information, but are smaller than "B". In either case, the output of either the first negative pressure pump 204 or the second negative pressure pump 214 is increased compared to before the disaster information is received by the antenna 410, and the secondary piping 102 pressure is reduced.

In this way, by determining the output of the first negative pressure pump 204 and the second negative pressure pump 214 according to the seismic intensity expected in the building 10, the first negative pressure pump 204 and the second negative pressure pump 214 can be used to Energy consumption can be prevented.

When the computer 302 receives information regarding a disaster via the antenna 410, the output of the water pump 106 may be increased to increase the water pressure within the primary pipe 101. Thereby, when the valve 105 is opened, the secondary pipe 102 is quickly filled with water.

If computer 302 receives information regarding a disaster via antenna 410, it may increase the output of water pump 106 to move water from a pool (not shown) to tank 401. Thereby, even if the power supply is lost after a disaster, water in the tank 401 can be reliably filled into the secondary pipe 102.

The fire extinguishing system 1 for a nuclear power plant described above includes a sprinkler head 103 and a secondary pipe 102 as a sprinkler pipe for supplying water to the sprinkler head 103, and the secondary pipe 102 is normally in a negative pressure state. a negative pressure sprinkler system 100 maintained at It includes a pressure pump 204 and a tank 401 that supplies water to the secondary pipe 102 and is provided at a higher position than the sprinkler head 103.

The fire extinguishing system 1 of a nuclear power plant includes a computer 302 as a control means that receives information regarding a disaster and controls the negative pressure generated by the first negative pressure pump 204 in accordance with the information regarding the disaster.

A fire extinguishing system 1 for a nuclear power plant includes a first negative pressure pump 204 that can supply negative pressure to a secondary pipe 102 and a negative pressure pipe 201 and makes the inside of the building a negative pressure.

Note that the tank 401 and the additional piping 402 do not necessarily have to be provided. Antenna 410 does not necessarily have to be provided.

(Operation of fire extinguishing system at nuclear power plant)
When a fire occurs in the second compartment 12, the fire detector 301 detects heat or smoke caused by the fire. Detected information is sent from the fire detector 301 to the computer 302. Computer 302 provides a signal to valve 105 to open valve 105. Computer 302 drives water pump 106 or increases the driving force of water pump 106 . As a result, water is filled into the secondary pipe 102, which normally has no water and is in a negative pressure state.

The heat from the fire melts the heat sensitive mechanism of the sprinkler head 103. Thereby, the water discharge hole of the sprinkler head 103 and the secondary pipe 102 are connected. Water can be sprayed from the water spray holes of the sprinkler head 103 to extinguish the fire.

If the power is lost, the valve 105 can be opened manually. Or prepare a separate power source to open the valve. By opening the valve 105 manually or using a separate power source, water in the tank 401 flows to the secondary pipe 102 via the additional pipe 402. Thereby, water can be sprayed from the sprinkler head 103.

(effect)
In the nuclear power plant fire extinguishing system 1 configured in this way, the first negative pressure pump 204 is a pump for making the inside of the building 10 negative pressure, and is also a pump for making the secondary pipe 102 negative pressure. . Since the pump for reducing the pressure in the building 10 is originally provided in nuclear power plants, it is possible to create a negative pressure in the secondary pipe 102 without adding new equipment.

By opening the valve 105 manually or using a separate power supply when power is lost, water in the tank 401 is sent to the secondary pipe 102 via the additional pipe 402, thereby allowing water to be discharged from the sprinkler head 103. As a result, it is possible to respond to a fire even when power is lost.

The connecting pipe 205 is provided in the second section 12 where the negative pressure pipe 201 and the secondary pipe 102 are provided. Therefore, the connection pipe 205 between the negative pressure pipe 201 and the secondary pipe 102 can be shortened, and the construction cost can be reduced.

Furthermore, the negative pressure sprinkler system 100 according to the first embodiment (nuclear power plant fire extinguishing system 1) has the following effects. In normal pressure dry sprinkler systems, in the event of a fire, the pump operates and fills the secondary piping with water, but at this time, the air in the secondary piping is compressed by the water, so the water is filled smoothly (in a short period of time). Water does not fill up in the secondary piping. On the other hand, in the negative pressure sprinkler system 100, since the inside of the secondary pipe 102 is under negative pressure, water is smoothly filled into the secondary pipe 102. Therefore, it is possible to solve the problem of a delay in sprinkling water from the sprinkler head, which was a drawback of conventional dry sprinklers (pre-action sprinklers).

When the antenna 410 receives disaster information, the output of either the first negative pressure pump 204 or the second negative pressure pump 214 is increased to increase the degree of vacuum in the secondary piping 102. The time it takes to release water becomes shorter. Specifically, when the valve 105 is opened and the degree of vacuum in the secondary pipe 102 is high, water flows into the secondary pipe 102 at once, so water can be sprayed onto the ready-to-use material from the sprinkler head 103. Furthermore, since the amount of air sucked in per unit time from the inlet 203 increases, even if the building 10 is damaged due to a disaster, it is difficult for radioactive substances to leak from the building 10 to the outside.

(Embodiment 2)
In the fire extinguishing system 1 for a nuclear power plant according to the second embodiment, the negative pressure pipe 201 is normally filled with water and maintained in a negative pressure state. The other configurations are common to the nuclear power plant fire extinguishing system 1 of the first embodiment. In order to prevent water from directly flowing into the first negative pressure pump 204 and the second negative pressure pump 214, a membrane that does not allow water to pass through but allows air to pass through the first negative pressure pump 204 and the second negative pressure pump 214; It may be provided between the negative pressure pipe 201 and the negative pressure pipe 201. Further, the secondary pipe 102 is normally filled with water, the negative pressure pipe 201 is not filled with water, and a membrane is provided between the secondary pipe 102 and the negative pressure pipe 201 that does not allow water to pass through but allows air to pass through. Good too. Any of the following embodiments may also be a wet negative pressure sprinkler.

That is, the negative pressure sprinkler system 100 according to the second embodiment is a wet type negative pressure sprinkler system. Since the pressure inside the negative pressure pipe 201 is low, the negative pressure pipe 201
The water inside evaporates easily. When the water in the negative pressure pipe 201 evaporates and decreases, a system is employed to replenish the decreased water. For example, if the water in the negative pressure pipe 201 decreases, a sensor detects the decrease in water, the sensor sends a signal to the computer 302, and the computer 302 slightly opens the valve 105 to replenish water in the negative pressure pipe 201. It's okay.

Assume that one sprinkler head 103 is damaged. In this case, since the suction force by the connecting pipe 205 is stronger than the force that causes water to leak from the damaged sprinkler head 103, no water is discharged from the damaged sprinkler head 103. If a large number of sprinkler heads 103 are damaged at the same time, water will be discharged from the damaged sprinkler heads 103, but it is extremely unlikely that a large number of sprinkler heads 103 will be damaged at the same time.

(Embodiment 3)
FIG. 2 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a third embodiment. In Embodiment 3, a fire extinguishing system 1 for a nuclear power plant has a sprinkler head 103 and a secondary pipe 102 as a sprinkler pipe for supplying water to the sprinkler head 103, and the secondary pipe 102 is in a normal state. The sprinkler system includes a negative pressure sprinkler system 100 maintained in a negative pressure state, and a first negative pressure pump 204 as a negative pressure device capable of supplying negative pressure to sprinkler piping. At a connection point 212, the pipe 211 and the secondary pipe 102 are connected. Piping 211 is connected to first negative pressure pump 204 . The first negative pressure pump 204 can supply negative pressure to the piping 211 and the secondary piping 102 .

Also in this embodiment, leakage of water from the sprinkler head 103 within the nuclear power plant can be prevented.

(Embodiment 4)
FIG. 3 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a fourth embodiment. In Embodiment 4, a fire extinguishing system 1 for a nuclear power plant includes a sprinkler head 103 and a secondary pipe 102 as a sprinkler pipe for supplying water to the sprinkler head 103. A negative pressure sprinkler system 100 in which the secondary piping 102 is normally maintained in a negative pressure state, a negative pressure piping 201 for supplying negative pressure used in the nuclear power plant, and a negative pressure piping 201 in the secondary piping 102 and the negative pressure piping 201. A first negative pressure pump 204 and a second negative pressure pump 214 are provided as first and second negative pressure devices capable of supplying pressure.

A first negative pressure pump 204 and a second negative pressure pump 214 are connected to the secondary pipe 102 via a pipe 211 .

A valve 209 is provided on the negative pressure pipe 201. A valve 219 is provided in the pipe 211. The opening and closing of valves 209 and 219 is controlled by computer 302.

During normal operation, the valves 209 and 219 are opened and closed so that the first negative pressure pump 204 supplies negative pressure to the negative pressure piping 201 and the second negative pressure pump 214 supplies negative pressure to the piping 211 and the secondary piping 102. is controlled.

On the other hand, when the first negative pressure pump 204 is stopped for maintenance, the valve 209 and The opening and closing of 219 is controlled.

When the second negative pressure pump 214 is stopped for maintenance, the opening and closing of the valves 209 and 219 is controlled so that the first negative pressure pump 204 supplies negative pressure to the negative pressure piping 201, the piping 211, and the secondary piping 102. be done.

(Embodiment 5)
FIG. 4 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to the fifth embodiment. In Embodiment 5, a fire extinguishing system 1 for a nuclear power plant includes a sprinkler head 103 and a secondary pipe 102 as a sprinkler pipe for supplying water to the sprinkler head 103. Negative pressure sprinkler system 100 in which piping 102 is normally maintained in a negative pressure state, negative pressure piping 201 for supplying negative pressure used in a nuclear power plant, and negative pressure piping 201 capable of supplying negative pressure It includes a first negative pressure pump 204 as a first negative pressure device, and a second negative pressure pump 214 as a second negative pressure device capable of supplying negative pressure to the secondary pipe 102 and the negative pressure pipe 201.

During normal operation, the opening and closing of the valve 209 is controlled so that the first negative pressure pump 204 supplies negative pressure to the negative pressure piping 201 and the second negative pressure pump 214 supplies negative pressure to the piping 211 and the secondary piping 102. be done.

On the other hand, when the first negative pressure pump 204 is stopped for maintenance, the valve 209 is turned on so that the second negative pressure pump 214 supplies negative pressure to the negative pressure piping 201, the piping 211, and the secondary piping 102. Opening/closing is controlled.

(Embodiment 6)
FIG. 5 is a schematic diagram of a fire extinguishing system for a nuclear power plant according to a sixth embodiment. In Embodiment 6, a fire extinguishing system 1 for a nuclear power plant has a sprinkler head 103 and a secondary pipe 102 as a sprinkler pipe for supplying water to the sprinkler head 103, and the secondary pipe 102 is in a normal state. a negative pressure sprinkler system 100 that is maintained in a negative pressure state, a negative pressure pipe 201 for supplying negative pressure used in the nuclear power plant, and a first negative pressure device capable of supplying negative pressure to the negative pressure pipe 201. a second negative pressure pump 214 as a second negative pressure device capable of supplying negative pressure to the secondary piping 102 and the negative pressure piping 201, and supplying negative pressure to the secondary piping 102. A third negative pressure pump 218 is provided as a possible third negative pressure device.

During normal operation, the valves 209 and 219 are opened and closed so that the first negative pressure pump 204 supplies negative pressure to the negative pressure piping 201 and the second negative pressure pump 214 supplies negative pressure to the piping 211 and the secondary piping 102. is controlled.

On the other hand, when the first negative pressure pump 204 is stopped for maintenance, the second negative pressure pump 214 supplies negative pressure to the negative pressure piping 201, and the third negative pressure pump 218 supplies negative pressure to the piping 211 and the secondary The opening and closing of valves 209 and 219 are controlled to supply negative pressure to piping 102.

When the second negative pressure pump 214 is stopped for maintenance, the first negative pressure pump 204 supplies negative pressure to the negative pressure piping 201, the piping 211, and the secondary piping 102, and the third negative pressure pump 218 supplies negative pressure to the piping 211 and the secondary piping 102. The opening and closing of valves 209 and 219 are controlled so as to supply negative pressure to secondary pipe 102.

The embodiments disclosed herein are illustrative in all respects and should be considered not to be restrictive. The scope of the present invention is indicated by the claims rather than the embodiments described above, and it is intended that equivalent meanings to the claims and all changes within the scope are included.

1 Nuclear power plant fire extinguishing system, 10 building, 11 first compartment, 12 second compartment, 100 negative pressure sprinkler system, 101 primary piping, 102 secondary piping, 103 sprinkler head, 105, 209, 219 valve, 106 water pump , 200 negative pressure system, 201 negative pressure piping, 202, 212 connection point, 203 suction port, 204 first negative pressure pump, 205 connection pipe, 214 second negative pressure pump, 218 third negative pressure pump, 300 detection system, 301 Fire detector, 302 Computer, 311,312
Signal line, 401 Tank, 402 Additional piping, 403 Arrow, 410 Antenna.

Claims (2)

A fire extinguishing system for a nuclear power plant, the nuclear power plant fire extinguishing system being installed in a building of the nuclear power plant,
A negative pressure sprinkler system comprising a sprinkler head and sprinkler piping for supplying water to the sprinkler head, wherein the sprinkler piping is normally maintained in a negative pressure state;
Negative pressure piping connected to the sprinkler piping;
a negative pressure device capable of supplying negative pressure to the sprinkler piping and the negative pressure piping;
a tank provided in the building for supplying water to the sprinkler piping;
a computer that controls the negative pressure of the negative pressure sprinkler system generated by a negative pressure pump;
Equipped with
the computer receives information regarding a disaster;
All of the additional piping connected to the tank can be provided in the building, the additional piping can be protected, and the period of shaking of the building and the period of shaking of the water in the tank are equal to each other in the event of an earthquake. A fire extinguishing system for a nuclear power plant that attenuates the shaking of the building due to the difference. A fire extinguishing system for a nuclear power plant, the nuclear power plant fire extinguishing system being installed in a building of the nuclear power plant,
A negative pressure sprinkler system comprising a sprinkler head and sprinkler piping for supplying water to the sprinkler head, wherein the sprinkler piping is normally maintained in a negative pressure state;
Negative pressure piping connected to the sprinkler piping;
a negative pressure device capable of supplying negative pressure to the sprinkler piping and the negative pressure piping;
A fire extinguishing system for a nuclear power plant, comprising: a control means for controlling negative pressure generated by the negative pressure device according to an earthquake magnitude and a seismic intensity of the building that is predicted according to a distance from the epicenter to the building.

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