JP5781575B2 - Remote control device and remote control device of nuclear power plant - Google Patents

Description

The present invention relates to a remote control unit of the remote operation apparatus and nuclear power plants, for example, as an air-operated valve installed in nuclear power plants, the solenoid valve is installed in the middle of the pipe system opening and closing operation of the valve for Ru switch It is related with the remote control apparatus suitable for what is, and the remote control apparatus of a nuclear power plant.

  In various plants including nuclear power plants, pipes for flowing gases such as air, nitrogen or steam, and liquids such as water are installed. An electric valve or air or nitrogen operating valve is installed to adjust the flow rate, pressure, etc. by operating with electricity, compressed air, nitrogen, etc., by opening, closing to shut off, or electric or pneumatic signals. Has been.

  In particular, in an air or nitrogen operating valve installed in a nuclear power plant, an electromagnetic valve is provided in the middle of an air piping system in order to switch the opening / closing operation of the valve. For example, a total power loss accident (SBO: At the time of Station Blackout), the solenoid valve's coil is de-excited and the air pressure decreases from the air supply source. However, after that, the air supply cannot be supplied and the air supply device cannot supply the air. The operation of the operation valve becomes impossible, and there is a risk that the subsequent operation of the air or nitrogen operation valve may be hindered.

  As described above, the air-operated valve has the potential of being unable to operate the air-operated valve due to the inability to supply electricity from the power source and the inability to supply air from the air supply device. Therefore, even in an emergency (for example, SBO) Equipment that can be operated remotely is required.

  On the other hand, even if the total power loss occurs and hydrogen generated in the reactor pressure vessel leaks into the reactor building, there is a technology that safely treats hydrogen to prevent hydrogen explosion and damage the reactor building. It is described in Patent Document 1.

JP2012-230058A

  Normally, the opening or closing operation of an air or nitrogen operating valve can be switched by turning on and off the power of a solenoid valve installed in the middle of an air piping system that supplies air or nitrogen to power the valve. At the time of loss, the power supply of the solenoid valve for the opening / closing operation of the air or nitrogen operating valve cannot be turned on / off due to the loss of the power supply or the power source, and the supply of power air or nitrogen becomes impossible. Remote operation from the outside becomes impossible. However, in the event of an accident that exceeds the design standard failure, the necessary air or nitrogen actuated valve must be remotely operated from the outside by a power source / power air source different from the normal power source / power air source. It is necessary to be able to do this without affecting the normal operating characteristics of the air or nitrogen operated valve.

  In particular, in a nuclear power plant, in order to be able to open and close the air or nitrogen operation valve in the reactor containment vessel in an emergency such as SBO, an operation electromagnetic valve is installed outside the reactor containment vessel. In order to open and close the air or nitrogen operating valve by connecting a power source such as a battery other than the normal power source, the operating characteristics such as the operating time required for the air or nitrogen operating valve will not be affected. In addition, it is necessary to consider the exhaust of the operating air to the outside of the containment vessel, and it is necessary to secure the operating source of the air or nitrogen supply device used at the time of power loss considering these things ing.

  However, Patent Document 1 described above describes means for preventing damage to the reactor building even when hydrogen generated in the reactor pressure vessel leaks into the reactor building when all power is lost. However, there is no description about securing the operation source of the air or nitrogen supply device used when power is lost.

The present invention has been made in view of the above points, and an object of the present invention is to provide a remote operation device capable of remotely operating an operation valve such as an air operation valve even when power is lost, and a remote operation device for a nuclear power plant. It is in.

In order to achieve the above object, the remote control device of the present invention remotely operates a gas operated valve that opens and closes by supplying or discharging a body from the outside of a building provided with the gas operated valve. In the apparatus, a first gas supply source provided outside the building, a second gas supply source provided inside the building, and the second gas supply source and the gas operation valve are connected. A switching valve for switching the exhaust from the solenoid valve and the supply of air to the solenoid valve in an exhaust line of the solenoid valve, comprising a solenoid valve that opens and closes a gas flow to the gas actuation valve in the middle of the piping There is provided, said switching valve, the loss of power is exhausted through the building outside of the exhaust line from the air supply line of the switching valve, the gas to create dynamic said switching valve is eliminated, the switching valve It is exhausted from the exhaust line into the building. .
It is characterized by that.

In order to achieve the above object, the remote control device for a nuclear power plant of the present invention is a pipe branched from a main steam pipe for supplying steam from a reactor pressure vessel stored in a reactor containment vessel to a turbine building. In a nuclear power plant remotely operating a cylinder for operating a safety valve for releasing steam in the main steam pipe, wherein the nuclear power plant remote operating device is configured as described above. A device is provided .

In order to achieve the above object, the remote control device for a nuclear power plant according to the present invention opens and closes an emergency gas treatment system that discharges gas from a reactor containment vessel in which a reactor pressure vessel is contained from an exhaust tower. A gas-operated valve that is provided with a valve and opens the on-off valve when the pressure in the reactor containment vessel exceeds a predetermined value to exhaust the gas in the reactor containment vessel from the emergency gas processing system In a remote control device for a nuclear power plant that remotely operates a cylinder for operating the nuclear power plant, the remote control device for the nuclear power plant includes the remote control device having the above-described configuration .

  According to the present invention, there is an effect that an operation valve such as an air operation valve can be remotely operated even when the power supply is lost.

It is Example 1 of the remote control apparatus of this invention, and is a figure which shows the state by which the switching valve is connected to the exhaust side of the solenoid valve. It is a figure which shows the state which the switching valve switched from the state of FIG. 1 to the supply side of a solenoid valve. It is a figure which shows the standby state at the normal time in Example 1 of the remote control apparatus of this invention. It is a figure which shows the normal air supply state in Example 1 of the remote control apparatus of this invention. It is a figure which shows the normal exhaust state in Example 1 of the remote control apparatus of this invention. It is a figure which shows the standby state at the time of the power loss in Example 1 of the remote control apparatus of this invention. It is a figure which shows the air supply state at the time of the power loss in Example 1 of the remote control apparatus of this invention. It is a figure which shows the exhaust condition at the time of the power loss in Example 1 of the remote control apparatus of this invention. It is a figure which shows the flow of the air supply state in the normal time of the remote control apparatus shown in FIG. It is a figure which shows the flow of the exhaust_gas | exhaustion state at the normal time of the remote control apparatus shown in FIG. It is a figure which shows the flow of the air supply state at the time of the power loss of the remote control apparatus shown in FIG. It is a figure which shows the flow of the exhaustion state at the time of the power loss of the remote control apparatus shown in FIG. It is a figure which shows Example 2 of the remote control apparatus of this invention. It is a figure which shows the remote control apparatus of the nuclear power plant which is Example 3 of this invention. It is a figure which shows the remote control apparatus of the nuclear power plant which is Example 4 of this invention. It is a figure which shows the case where the remote control apparatus which is Example 5 of this invention is applied to the pressurizer relief valve and main steam relief valve in a pressurized water reactor.

Hereinafter, the remote control unit of the remote operation apparatus and nuclear power plants of the present invention will be described with reference to the embodiments shown. In each figure, the black display of the valve indicates the “closed” state, and the white display indicates the “open” state. Further, the same reference numerals are used for the same component parts, and the description of the parts already described is omitted.

1 and 2 show a first embodiment of a remote control device according to the present invention. For example, there is an air-operated valve actuator 1 that opens and closes a valve main body (not shown). It is operated by the electromagnetic valve 2 installed in the middle of the inner pipe 20A. That is, the solenoid valve 2 is supplied with control air or nitrogen from the IA system (instrument air supply system equipment) which is a supply port when the power is turned on and off, so that the air actuated valve actuator 1 operates. When the operation of the solenoid valve 2 is turned off after the operation is completed, the control air or nitrogen of the air-actuated valve actuator 1 is exhausted from the exhaust port of the solenoid valve 2 through the path A → E of the switching valve 3, and the air-actuated valve The actuator 1 returns to the state before the operation.

  Outside the building 21 in a situation where it is difficult to energize the solenoid valve 2 or when it is difficult to supply control air or nitrogen from the IA system (instrument air supply system equipment) to the supply port of the solenoid valve 2 When a power source of a second electromagnetic valve 5 described later is turned on from a cylinder 4 which is a gas supply source in which air or nitrogen is stored, control air or Nitrogen is supplied to the switching valve 3. Thereby, the flow path of P⇔A is formed in the switching valve 3, and the flow path of the second electromagnetic valve 5, the switching valve 3, the electromagnetic valve 2, and the air operated valve actuator 1 is formed from the cylinder 4. When the actuator 1 is activated and the solenoid valve 5 is turned off after the operation is completed, the pressure between the second solenoid valve 5, the switching valve 3, the solenoid valve 2, and the air-actuated valve actuator 1 is reduced. The flow path is switched from A to E. Further, the control air or nitrogen of the air actuated valve actuator 1 is discharged from the exhaust port of the electromagnetic valve 2 through the path A → E of the switching valve 3, and the air actuated valve actuator 1 returns to the state before the operation.

  That is, in the present embodiment, the solenoid valve 2 includes two systems of an IA system (instrumented air supply system facility) and a cylinder 4 as gas supply sources for supplying gas (air or nitrogen).

  In this embodiment, the air operated valve actuator 1 is operated in this way to open and close the valve body. 1 and 2, the notation of the switching valve 3 is similar to the JIS symbol notation of the air hydraulic circuit diagram.

  In the present embodiment, a switching valve 3 for switching between exhaust from the solenoid valve 2 and supply of air to the solenoid valve 2 is installed in the middle of the pipe 20 </ b> A in the building 21 between the solenoid valve 2 and the cylinder 4. This switching valve 3 is switched to connection with the cylinder 4 in order to supply air or nitrogen to the electromagnetic valve 2 when the power is lost.

  In other words, the switching valve 3 is installed in the middle of the pipe 20A in the building 21 on the exhaust line side of the solenoid valve 2, and the switching valve 3 is connected to the pipe 20B from the cylinder 4 provided outside the building 21 with operating air or nitrogen. In normal times, as shown in FIG. 1, the switching valve 3 connected to the exhaust side of the electromagnetic valve 2 is switched to the air supply side as shown in FIG. Nitrogen can be supplied to the electromagnetic valve 2, and air can be supplied to the air-operated valve actuator 1 even when power is lost.

  Further, in the middle of the pipe 20 </ b> B outside the building 21 on the cylinder 4 side of the switching valve 3, the atmosphere in the normal building 21 is prevented from leaking out of the building 21 due to a leakage on the air supply side of the switching valve 3. An isolation valve 6 is installed.

  Furthermore, the facility for supplying air or nitrogen to the switching valve 3 can have improved safety by having a power source type different from the power source in the building 21, for example, a battery. You may be supplied with air.

  In other words, in the present embodiment, the second electromagnetic valve 5 installed in the pipe 20B outside the building 21 that supplies the switching valve 3 from the cylinder 4 has an AC power source or a DC power source, a DC power source, and a manual power source. It consists of three solenoid valves. That is, as shown in FIGS. 1 and 2, the second electromagnetic valve 5A uses an AC power source or a DC power source as a power source in an emergency (part 1), and the second electromagnetic valve 5B has an emergency ( In the case of 2), a DC power source (for example, a battery) is operated as a power source, and the second electromagnetic valve 5C is manually operated as a backup.

  When the power source is lost, the second electromagnetic valve 5B using a DC power source (battery) as a driving source is driven, and air or nitrogen is supplied from the cylinder 4 to the electromagnetic valve 2. Leakage to the supply side of the switching valve 3 is prevented by the isolation valve 6.

Next, specific examples of each state in the above-described remote control device according to the first embodiment will be described with reference to FIGS.

  3 to 12, the valve body 7 is an angle valve having a cylinder 8 that is a drive device with a link using air or nitrogen as a power source (when air or nitrogen is not supplied by the spring force, The notation of the switching valve 3 is not the JIS symbol notation of the air hydraulic circuit diagram, but the open / closed state is indicated by white / black as in the case of other valves.

FIG. 3 shows a standby state during normal use of the remote control device of this embodiment. As shown in the figure, during normal use, the solenoid valve 2 connected to the cylinder (pneumatically operated valve actuator) 8 is open on the exhaust line 11 side in a standby state. The switching valve 3 is open on the exhaust line 13 side.

4 and 9 show the state and flow at the time of air supply during normal use of the remote control device of this embodiment. As shown in the figure, when a valve operation signal enters the solenoid valve 2 (step 19), the solenoid valve 2 closes the exhaust line 11 and opens the supply line 10 (step 20). Then, gas such as compressed air or compressed nitrogen is supplied to the cylinder 8 from the air supply line 10 of the electromagnetic valve 2 (step 21), and the valve body 7 is activated (step 22).

5 and 10 show the state and flow during exhaust of the remote control device of this embodiment during normal use. As shown in the figure, when returning to the standby state, a signal is sent to the solenoid valve 2 (step 23), the supply line 10 side of the solenoid valve 2 is closed, and the exhaust line 11 is opened (step 24). . Then, the gas supplied to the cylinder 8 is exhausted from the exhaust line 11 side of the solenoid valve 2 (step 25), and the exhaust line 13 of the switching valve 3 (connected to the connection port E of the switching valve 3 in FIGS. 1 and 2) side. (Step 26). When there is not enough gas to actuate the cylinder 8, the valve body 7 is actuated (step 27) to return to the standby state. As an example, the standby time is closed and the operation time is open, but the reverse operation is also possible.

FIG. 6 shows a standby state at the time of a severe accident such as loss of all power sources of the remote control device of this embodiment. As shown in the figure, at the time of a severe accident such as loss of all power sources, due to the loss of power sources, the solenoid valve 2 is in a state where the exhaust line 11 side is opened and stands by without being operable from the outside.

FIG.7 and FIG.11 shows the state and flow at the time of the air supply at the time of a severe accident of the remote control apparatus of a present Example. As shown in the figure, due to the loss of power, the solenoid valve 2 opens the exhaust line 11 (connected to the connection port A of the switching valve 3 in FIGS. 1 and 2) and closes the supply side line 10 side. (Step 28). In order to operate the valve body 7 from the outside, the air supply line 17 side of the second electromagnetic valve 5 whose driving source is a battery outside the building 21 is opened, and the exhaust line 18 is closed (step 29). Next, by operating the isolation valve 6 to open (step 30), sufficient gas for operating the switching valve 3 is supplied to the air supply line 14 of the second electromagnetic valve 5 (the switching valve in FIGS. 1 and 2). 3 is connected from the connection port P) (step 31). With the supplied gas, the switching valve 3 closes the exhaust line 13 (the connection port E of the switching valve 3 in FIGS. 1 and 2) and closes the air supply line 14 (the connection port P of the switching valve 3 in FIGS. 1 and 2). Is open. Then, the gas supplied from outside the building 21 is supplied from the air supply line 14 of the switching valve 3 (connected to the connection port P of the switching valve 3 of FIGS. 1 and 2) to the exhaust line 11 of the electromagnetic valve 2 (FIGS. 1 and 2). The valve main body 7 is actuated when the cylinder 8 is filled with sufficient air pressure to actuate the valve main body 7 (step 32). .

8 and 12 show the state and flow during exhaust of the remote control device of this embodiment during a severe accident. As shown in the figure, a valve operation signal is sent to the second electromagnetic valve 5 whose driving source is a battery outside the building 21 (step 33). When returning the valve body 7 to the standby state, the exhaust line 18 side of the second electromagnetic valve 5 outside the building 21 is opened, and the air supply line 17 side is closed (step 34). Then, the gas supplied to the cylinder 8 is exhausted from the exhaust line 11 side of the solenoid valve 2 (step 35), and from the exhaust line 11 of the solenoid valve 2 (connected to the connection port A of the switching valve 3 in FIGS. 1 and 2). The exhausted gas passes from the air supply line 14 of the switching valve 3 (connected to the connection port P of the switching valve 3 in FIGS. 1 and 2) via the exhaust line 18 of the second electromagnetic valve 5 outside the building 21, The air is exhausted (step 36). When there is not enough gas to operate the switching valve 3, the switching valve 3 closes the air supply line 14 (connected to the connection port P of the switching valve 3 in FIGS. 1 and 2) and the exhaust line 13 side (see FIG. Open the connection port E of the switching valves 3 of 1 and 2) (step 37). Then, the gas remaining in the cylinder 8 is exhausted from the exhaust line 11 side of the solenoid valve 2 (step 38), and the exhaust line 13 of the switching valve 3 (connected to the connection port E of the switching valve 3 in FIGS. 1 and 2). To the building 21. When there is not enough gas to actuate the cylinder 8, the valve body 7 is actuated (step 39) to return to the standby state. As an example, the standby time is closed and the operation time is open, but the reverse operation is also possible.

  As described above, in this embodiment, the switching valve 3 is connected in the middle of the piping 21A on the exhaust line 11 side of the solenoid valve 2, and a gas such as air or nitrogen is supplied from the outside of the building 21 by the cylinder 4 or the like when power is lost. Therefore, when operating air or nitrogen is supplied to the switching valve 3, the switching valve 3 connected to the exhaust side is normally switched to the supply side, and air or nitrogen is used as a solenoid valve when the power is lost. It becomes possible to supply. In addition, the pressure at which the switching valve 3 is switched is sufficiently higher than the pressure in the building 21. When the switching valve 3 is operating, the atmosphere in the building 21 is passed through the second electromagnetic valve 5. It will not flow out.

  Therefore, there is an effect that an operation valve such as an air operation valve can be remotely operated even when the power supply is lost. Further, by differentiating the power source type (AC power source or DC power source) of the second electromagnetic valve 5 from the electromagnetic valve 2 that always uses, there is also an effect that the driving source can be diversified.

  The facility for supplying air or nitrogen to the switching valve 3 can be improved in safety by having a power source (for example, a battery) different from the power source in the building 21, but as a backup, a manual valve You may be supplied with air.

FIG. 13 shows a second embodiment of the remote control device of the present invention. The present embodiment shown in the figure has substantially the same configuration as the above-described embodiment, but the configuration different from the first embodiment is that the exhaust line 13 of the switching valve 3 in the building 21 is connected to the gas processing line 39, The exhaust line 18 of the second electromagnetic valve 5 is connected to a gas processing line 39 via a line 38 provided with a check valve 15 outside the building 21.

  According to the present embodiment, the same effect as that of the first embodiment can be obtained, and the exhaust line 18 of the second electromagnetic valve 5 is gas-treated through the line 38 provided with the check valve 15. Returning to the line 39 can further improve the safety of the operator.

  When the gas treatment line 39 is provided only outside the building 21, the gas outside the building 21 is directly connected to the exhaust line 18 of the second electromagnetic valve 5 without using the line 38 provided with the check valve 15. By connecting to the processing line 39, the safety of the operator can be improved.

FIG. 14 shows a remote control device for a nuclear power plant that is Embodiment 3 of the present invention.

As shown in the figure, the remote control device for the nuclear power plant of this embodiment is a main steam pipe for supplying steam from a reactor pressure vessel 40 stored in a reactor containment vessel 48 to a turbine building (not shown). A main steam relief safety valve 43 that is provided in a pipe 51 branched from 41 and opens when the pressure of the reactor reaches a certain value or more, and releases the main steam in the main steam pipe 41, and the main steam relief safety valve 43 In order to forcibly open the cylinder, a forcible operation cylinder 47 for supplying air or nitrogen to the main steam escape safety valve 43 and a solenoid valve for opening and closing the flow of air or nitrogen to the forcible operation cylinder 47 2 and an air or nitrogen supply source installed outside the reactor containment vessel 48 for supplying air or nitrogen to the air supply port and the exhaust port of the electromagnetic valve 2 independently through a pipe (not shown) High pressure gas accumulation Data and is a schematic configuration and a) supplying nitrogen gas by vaporizing the same cylinder and liquid nitrogen as in Example 1.

  In this embodiment, a switching valve 3 for switching the exhaust from the solenoid valve 2 and the supply of air to the solenoid valve 2 is installed in the exhaust line of the solenoid valve 2 in the reactor containment vessel 48. When the power is lost, in order to supply air or nitrogen to the solenoid valve 2, another air or nitrogen supply source (cylinder) different from the air or nitrogen supply source installed outside the reactor containment vessel 48 through the pipe is used. ) Is switched to the connection of the second electromagnetic valve 5 via the air supply line 17.

  The cylinder as the air or nitrogen supply source described above is connected to the second electromagnetic valve 5 installed in the pipe 20B outside the reactor containment vessel 48 supplied from the cylinder 4 to the switching valve 3 as in the first embodiment. The second solenoid valve 5 is composed of one or more of three valves, each of which is powered by an AC power source or a DC power source, a DC power source (for example, a battery), and a manual power source. These are the same as in Example 1. Further, an isolation valve 6 for preventing leakage of the switching valve 3 to the air supply side is installed in the middle of the piping outside the reactor containment vessel 48 on the cylinder side of the switching valve 3. In this configuration, leakage to the air supply side is prevented.

  Normally, steam is supplied from the reactor pressure vessel 40 to the turbine building through the main steam pipe 41. When a nuclear power plant detects a disaster such as an earthquake, a loss of coolant due to pipe breakage (LOCA: Loss) Of Coolant Accident), the main steam isolation valve 42 provided in the main steam pipe 41 is closed. At that time, the temperature in the reactor continues to rise due to the decay heat of the nuclear fuel, and the pressure in the reactor also rises with the generation of steam. When the reactor pressure exceeds a certain value, the main steam relief safety valve 43 provided in the pipe 51 branched from the main steam pipe 41 is actuated to lower the reactor pressure. At that time, the switching valve 3 does not affect the operation of the main steam relief safety valve 43.

  The reactor is cooled by the high-pressure core water injection system 44 or the low-pressure core water injection system 45, but it is desired that water can be injected from the external water injection line 46 by an emergency pump vehicle or the like when the total power supply is lost (SBO).

  At this time, if the pressure in the reactor is higher than the water injection pressure, it is necessary to lower the pressure in the reactor. However, the safety valve function of the main steam relief safety valve 43 described above provides a constant pressure in the reactor. Therefore, it is necessary to forcibly open the main steam relief safety valve 43 using the relief valve function of the main steam relief safety valve 43.

  Here, the relief valve function of the main steam relief safety valve 43 is to supply a gas such as nitrogen or compressed air stored in the accumulator to the forcible operation cylinder 47 of the main steam relief safety valve 43, and the main steam relief safety valve 43. It is a function to open.

  In this embodiment, in the event of a severe accident such as loss of all power, the solenoid valve 2 for supplying compressed air or compressed nitrogen to the main steam relief safety valve 43 becomes inoperable and waits with the exhaust side open, Thereafter, the switching valve 3 is connected to the exhaust line 11 side of the solenoid valve 2, and operating air or nitrogen is supplied to the switching valve 3 from an air or nitrogen supply source such as a cylinder provided outside the reactor containment vessel 48. In normal times, the switching valve 3 connected to the exhaust side is switched to the air supply side, and the air or nitrogen for operation is supplied to the electromagnetic valve 2, thereby operating the main steam relief safety valve 43 even when the power is lost. Air or nitrogen is supplied to the forcible operation cylinder 47 and can be operated.

  By operating the main steam relief safety valve 43, the pressure in the reactor pressure vessel 40 is released to the suppression chamber connection line and depressurized. By depressurizing the reactor pressure vessel 40, the pressure from the external water injection line 46 is reduced. Water can be injected and the reactor can be shut down cold.

FIG. 15 shows a remote control device for a nuclear power plant that is Embodiment 4 of the present invention.

As shown in the figure, the remote control device for a nuclear power plant according to the present embodiment is an emergency gas processing system (emergency system) that discharges gas from a reactor containment vessel 48 in which a reactor pressure vessel 40 is accommodated from an exhaust tower 54. Connected to an air or nitrogen operating valve 50 for supplying driving force to a driving part (cylinder or the like) for driving an on-off valve 52 installed in the gas processing equipment or filter vent equipment) 53. Solenoid valve 2 that opens and closes to supply and stop the flow of air or nitrogen to the drive unit (cylinder, etc.) of the engine, and atoms that supply air or nitrogen independently to the air supply and exhaust ports of the solenoid valve 2 Air or nitrogen supply source installed outside the reactor containment vessel 48 (not shown in the figure, but a cylinder and liquid nitrogen similar to those in the first embodiment are vaporized to supply nitrogen gas). .

  In this embodiment, the switching valve 3 for switching the supply of air to the solenoid valve 2 is installed in the exhaust line 11 from the solenoid valve 2, and this switching valve 3 supplies air or nitrogen to the solenoid valve 2 when power is lost. In order to supply the air, the supply line of the second solenoid valve 5 is connected to another air or nitrogen supply source (cylinder) different from the air or nitrogen supply source installed outside the reactor building 58 via the pipe 10. 17 is switched to a connection via 17.

  The cylinder which is an air or nitrogen supply source connected to a line for supplying air or nitrogen to the air or nitrogen operating valve 50 through the solenoid valve 2 via the switching valve 3 described above is a cylinder as in the first embodiment. 4 is connected to the second solenoid valve 5 installed in the pipe 20B outside the reactor building 58 to be supplied to the switching valve 3, and the second solenoid valve 5 is connected to an AC power source, a DC power source, a DC power source ( For example, it is composed of one or a plurality of valves out of three valves each having a power source such as a battery) and a manual power source, and the operation is the same as that of the first embodiment. Further, an isolation valve 6 for preventing leakage of the switching valve 3 to the air supply side is installed in the middle of the piping outside the reactor containment vessel 48 on the cylinder side of the switching valve 3. In this configuration, leakage to the air supply side is prevented.

  Normally, at the time of a severe accident such as loss of all power sources, the solenoid valve 2 for supplying compressed air or compressed nitrogen to the air or nitrogen operating valve 50 becomes inoperable and stands by with the exhaust side opened. In the present embodiment, the switching valve 3 is connected to the exhaust line 11 side of the electromagnetic valve 2, and operating air or nitrogen is connected to the switching valve 3, such as air such as a cylinder provided outside the reactor containment vessel 48, or Supplying from the nitrogen supply source, switching the switching valve 3 connected to the exhaust side to the supply side in normal times, and supplying air or nitrogen for operation to the solenoid valve 3 allows air or By supplying air or nitrogen to the nitrogen operating valve 50 and controlling the flow of air or nitrogen to the air or nitrogen operating valve 50, the opening / closing operation of the on / off valve 52 can be enabled, and the reactor containment vessel 48 can be operated. The internal pressure can be reduced by exhausting from the exhaust tower 54 through the emergency gas processing system (emergency gas processing equipment or filter vent equipment) 53.

FIG. 16 shows a case where the remote control device according to the fifth embodiment of the present invention is applied to a pressurizer relief valve and a main steam relief valve in a pressurized water reactor.

  As shown in the figure, the pressurized water reactor sends hot water generated in the reactor pressure vessel 59 to the steam generator 60 and is installed outside the reactor building 58 by the steam generated in the steam generator 60. A turbine (not shown) is rotated to obtain electric power. At that time, in order to pressurize the hot water generated in the reactor pressure vessel 59 and keep it in a liquid state, the pressurizer 56 that maintains the pressure and water level of the nuclear pressure vessel 59 is connected to the reactor pressure vessel 59 and the steam generator 60. A main steam relief valve 61 is provided in the middle of the main steam pipe 41 that sends steam to the turbine. The main steam relief valve 61 is provided with a forced operation cylinder 47B.

  On the other hand, a pressurizer 56 and a pressurizer relief valve 57 for forcibly reducing the pressure of the pressurizer 56 as necessary are provided, and the pressurizer relief valve 57 is provided with a forcible operation cylinder 47A. .

  Since the pressurizer relief valve 57 and the main steam relief valve 61 cannot be operated during SBO, the pressure reduction of the reactor pressure vessel 59 or the steam generator 60 can be safely performed by providing the switching valve described above. become able to.

That is, the remote control device applied to the pressurized water reactor shown in FIG. 16 is connected to the reactor pressure vessel 59 by the main steam pipe 41, and in the steam generator 60 for supplying cooling water to the reactor pressure vessel 59. A main steam release valve 61 for releasing steam, a forcible operation cylinder 47B for supplying air or nitrogen stored therein to the main steam release safety valve 61 to open the main steam release valve 61, a main steam The solenoid valve 2B is installed in the middle of the pipe 41 and opens and closes the air or nitrogen flow of the main steam pipe 41, and an air or nitrogen supply source such as a cylinder for supplying air or nitrogen to the solenoid valve 2B. ing.

  In this embodiment, a switching valve 3B for switching between exhaust from the solenoid valve 2B and supply of air to the solenoid valve 2B is installed in the exhaust line of the solenoid valve 2B. In order to supply air or nitrogen to the electromagnetic valve 2B, the connection to the air or nitrogen supply source is switched.

  Further, a pressurizer escape is installed in the middle of the piping between the reactor pressure vessel 59 and the pressurizer 56 that holds the pressure and water level of the nuclear pressure vessel 59 and forcibly reduces the pressure of the pressurizer 56 as necessary. In order to open the pressurizer relief valve 57, the valve 57 is installed in the middle of the piping and a forced operation cylinder 47A for supplying air or nitrogen stored therein to the pressurizer relief valve. An electromagnetic valve 2A that opens and closes the flow of air or nitrogen to the operating cylinder 47A is provided, and air or nitrogen is supplied to the electromagnetic valve 2A from an air or nitrogen supply source such as a cylinder.

  In this embodiment, a switching valve 3A for switching between the exhaust from the solenoid valve 2A and the supply of air to the solenoid valve 2A is installed in the exhaust line of the solenoid valve 2A. In order to supply air or nitrogen to the solenoid valve 2A, the connection to the air or nitrogen supply source is switched.

  By adopting such a configuration of the present embodiment, even when the pressurizer relief valve 57 and / or the main steam relief valve 61 becomes inoperable at the time of SBO, by switching the switching valves 3A, 3B, etc. Since a gas such as air or nitrogen can be supplied from the gas supply source, it is possible to obtain the same effect as in the above-described embodiments.

  In the above-described embodiment, the air or nitrogen operating valve has been described. However, the present invention can also be applied to a safety valve, a relief valve, or a safety relief valve. Further, the present invention can be applied to chemical plants, petroleum plants, power generation facilities and the like in addition to nuclear plants. In addition to air or nitrogen, carbon dioxide can be considered as the gas to be supplied.

Furthermore, the present invention is not limited to the above-described embodiments, and includes various modifications.
For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Air-operated valve actuator, 2, 2A, 2B ... Solenoid valve, 3, 3A, 3B ... Switching valve, 4 ... Cylinder, 5, 5A, 5B, 5C ... Second solenoid valve, 6 ... Isolation valve, 7 ... Valve body, 8 ... Cylinder, 9 ... Solenoid valve with air operated valve, 10 ... Solenoid valve air supply line, 11 ... Solenoid valve exhaust line, 12 ... Switching valve, 13 ... Switching valve exhaust line, 14 ... Switching valve , 15 ... check valve, 17 ... second solenoid valve supply line, 18 ... second solenoid valve exhaust line, 21 ... building, 21A, 20B, 51, 55 ... piping, 38 ... 39, gas treatment line, 40 ... reactor pressure vessel, 41 ... main steam piping, 42 ... main steam isolation valve, 43 ... main steam relief safety valve, 44 ... high pressure core water injection system, 45 ... low pressure core water injection system, 46 ... External water injection line, 47, 47A, 47B ... Cylinder for forced operation, 48 ... Original Containment vessel, 50 ... Air or nitrogen operation valve, 52 ... Open / close valve, 53 ... Emergency gas treatment facility or filter vent facility, 54 ... Exhaust tower, 56 ... Pressurizer, 57 ... Pressurizer relief valve, 58 ... Reactor Building 59 ... Reactor pressure vessel 60 ... Steam generator 61 ... Main steam relief valve.

Claims (6)

In a remote control device for remotely operating a gas operated valve that opens and closes by supplying or discharging gas from the outside of the building provided with the gas operated valve,
A first gas supply source provided outside the building, a second gas supply source provided inside the building, and a pipe connecting the second gas supply source and the gas operation valve And an electromagnetic valve for opening and closing the flow of gas to the gas actuated valve,
Into the exhaust line before the SL solenoid valve, wherein the switching valve for switching the air supply installation to the exhaust and the solenoid valve from the solenoid valve, the switching valve, the loss of power, building out from the air supply line of the switching valve is exhausted through the exhaust line, the gas to create dynamic said switching valve is eliminated, the remote operation device characterized in that it is exhausted to the inside building from an exhaust line of the switching valve. The remote control device according to claim 1,
The remote control device according to claim 1, wherein the first gas supply source has a plurality of second valves connected to a plurality of driving sources provided outside the building. Provided in the middle of a pipe branched from the main steam pipe for supplying the steam from the reactor pressure vessel stored in the reactor containment vessel to the turbine building, and for operating a safety valve for releasing the steam in the main steam pipe In a remote control device of a nuclear power plant that operates a cylinder remotely,
A remote control device for a nuclear power plant comprising the remote control device according to claim 1 or 2 . When an on-off valve is installed in the emergency gas treatment system that discharges the gas from the reactor containment vessel in which the reactor pressure vessel is stored from the exhaust tower, and the pressure in the reactor containment vessel exceeds a certain value In a remote control device of a nuclear power plant that remotely operates a cylinder for operating a gas operating valve that opens the on-off valve to exhaust gas in the reactor containment vessel from the emergency gas processing system,
A remote control device for a nuclear power plant comprising the remote control device according to claim 1 or 2 . Connected to the reactor pressure vessel by piping, installed in the pressurizer that holds the pressure and water level of the reactor pressure vessel, and operates the pressurizer relief valve that forcibly depressurizes the pressure of the pressurizer as necessary In a remote control device for a nuclear power plant that remotely operates a cylinder for
A remote control device for a nuclear power plant comprising the remote control device according to claim 1 or 2 . Remote operation of a nuclear power plant that is connected to a reactor pressure vessel by piping and remotely operates a cylinder for operating a main steam relief safety valve that escapes steam in a steam generator that supplies cooling water to the reactor pressure vessel. In the device
A remote control device for a nuclear power plant comprising the remote control device according to claim 1 or 2 .

Images