Remote valve operating device and nuclear plant

Abstract

To provide a valve remote control device capable of remotely controlling a plurality of operation object valves by an operation of one preliminary operation part.SOLUTION: A valve remote control device 100 for remotely controlling a plurality of operation object valves 10 operated by a main operation part, by a preliminary operation part, includes: a pressure pump used as the preliminary operation part, for circulating a working fluid; a plurality of rod rotary cylinders 105 provided corresponding to each operation object vale, for opening / closing the operation object valves by rotating in the direction corresponding to the circulation direction of the working fluid; and pipelines 102s, 102r for circulating the working fluid between the pressure pump 101 and the plurality of rod rotary cylinders.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a valve remote control device and a nuclear power plant. [Background technology]

[0002] A technology for remotely operating the opening and closing of an on-off valve for a pipe material is disclosed in the following Patent Document 1. This Patent Document 1 describes that "the system includes an actuator for opening and closing the valve, a main torque input means that is driven by a main operating source and inputs torque to the actuator, and a backup torque input means that is driven by a backup operating source that can be used in the event of a loss of the main operating source and inputs torque to the actuator via a flexible shaft, and the actuator is equipped with an auto-declutch mechanism that automatically switches input between the main torque input means and the backup torque input means." [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-118995 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the above-mentioned technology, it is necessary to provide a backup torque input means for each valve to be operated, so if there are multiple valves to be operated, it is necessary to operate multiple backup torque input means corresponding to the number of valves to be operated, making it difficult to respond quickly in an emergency.

[0005] Therefore, an object of the present invention is to provide a valve remote control device that can remotely control multiple valves to be operated by operating a single standby operating unit, and a nuclear power plant equipped with this valve remote control device. [Means for solving the problem]

[0006] In order to solve the above problems, for example, the configurations described in the claims are adopted. The present application includes multiple means for solving the above-mentioned problems. One example is a remote valve control device for remotely controlling, by an auxiliary control unit, multiple valves to be operated by a main control unit, the remote valve control device including: a pressure pump used as the auxiliary control unit for circulating a working fluid; multiple rotating rod cylinders provided corresponding to each of the valves to be operated, which rotate in a direction corresponding to the circulation direction of the working fluid to open and close the valves to be operated; and piping for circulating the working fluid between the pressure pump and the multiple rotating rod cylinders. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a valve remote control device capable of remotely controlling a plurality of valves to be operated by operating one standby operating unit, and a nuclear power plant equipped with this valve remote control device. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram of a valve remote control device according to an embodiment. FIG. [Figure 2] 10A to 10C are diagrams illustrating the operation of the valve remote control device according to the embodiment. [Figure 3] 1 is a configuration diagram of a nuclear power plant according to an embodiment; [Figure 4] 1 is a diagram for explaining remote control (part 1) of an isolation valve by a valve remote control device according to an embodiment. FIG. [Figure 5] 10 is a diagram for explaining remote control of an isolation valve (part 2) by a valve remote control device according to an embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings, in the order of a valve remote control device, a valve remote control method, and a nuclear power plant. In the drawings used in the embodiments described below, the same components are designated by the same reference numerals, and some of the overlapping descriptions may be omitted.

[0010] ≪Valve remote control device 100≫ Fig. 1 is a configuration diagram of a valve remote control device 100 according to an embodiment. The valve remote control device 100 shown in Fig. 1 is a manual valve remote control device 100 that uses fluid pressure to remotely control a plurality of valves 10 to be operated.

[0011] The control valve 10 is, for example, an isolation valve installed in a nuclear power plant in the event of a loss of power to the nuclear power plant. Although two control valves 10 are illustrated in FIG. 1, the control valve 10 may be three or more. The control valve 10, which is remotely controlled by the valve remote operating device 100, opens and closes by torque input from one of two torque input terminals. Torque is input to one of the torque input terminals from a motor driven by an AC power source, which is the main operating unit. Torque is input to the other torque input terminal from the valve remote operating device 100, which will be described next. In each control valve 10, the input terminal to which torque is input from the valve remote operating device 100 is, for example, a valve handle or a power transmission gear inside the drive unit.

[0012] Such a valve remote control device 100 includes a pressure pump 101, a working fluid supply line 102s, a working fluid return line 102r, a working fluid branching mechanism 103, a first circulation line 104a, a second circulation line 104b, and a rod rotating cylinder 105. This valve remote control device 100 is manually driven. Each component of the valve remote control device 100 will be described below.

[0013] <Pressure Pump 101> The pressure pump 101 is a pump for circulating the working fluid [F] and serves as a backup operating unit for simultaneously operating multiple valves 10. The pressure pump 101 may be a portable pressure pump, a manual pump, or a pump that can be switched between manual and electric operation. If the pressure pump 101 is electric, it must be capable of being driven using a portable backup power source. The working fluid [F] circulated by the pressure pump 101 is an incompressible fluid such as oil or water, and is preferably made of a phosphate ester-based material. Because phosphate ester-based materials have a flash point of 230°C or higher, using this as the working fluid [F] can prevent ignition in the event of a leak of the working fluid [F]. If hydraulic oil is used as the working fluid [F], a hydraulic pump is used as the pressure pump 101.

[0014] <Working fluid supply line 102s and working fluid return line 102r> The working fluid supply line 102s and the working fluid return line 102r are part of the piping for circulating the working fluid [F] between the pressure pump 101 and each rod rotating cylinder 105. The working fluid supply line 102s and the working fluid return line 102r are high-pressure hoses connected to the pressure pump 101. Of these, the working fluid supply line 102s sends the working fluid [F] from the pressure pump 101 to the working fluid branching mechanism 103. The working fluid return line 102r sends the working fluid [F] back from the working fluid branching mechanism 103 to the pressure pump 101. A check valve 102rv is provided in this working fluid return line 102r. The working fluid supply line 102s and the working fluid return line 102r described above are configured to branch into multiple lines within the working fluid branching mechanism 103, which will be described next.

[0015] The working fluid supply line 102s and working fluid return line 102r are preferably made of high-pressure hoses made of silicone rubber, which can withstand heat up to 200°C and radiation up to 100 kGy, and are therefore expected to maintain their functionality even under severe conditions, such as in the event of a nuclear power plant accident.

[0016] <Working fluid branching mechanism 103> The working fluid branching mechanism 103 is a mechanism for distributing and circulating the working fluid [F] circulated by the pressure pump 101 to each of the multiple target valves 10. The working fluid branching mechanism 103 is arranged between the working fluid supply line 102s and the working fluid return line 102r and the first circulation line 104a and the second circulation line 104b, and has multiple valve units 103u provided corresponding to each target valve 10. Each valve unit 103u is connected in parallel to the working fluid supply line 102s and the working fluid return line 102r, and each branch line branched from the working fluid supply line 102s and the working fluid return line 102r is connected to each valve unit 103u.

[0017] Each valve unit 103u includes a first on-off valve 31a, a second on-off valve 31b, a first branch pipe 32a, a second branch pipe 32b, a first three-way valve 33a, and a second three-way valve 33b. These will be described in order below.

[0018] [First on-off valve 31a and second on-off valve 31b] The first on-off valve 31a and the second on-off valve 31b are used to control the connections between the working fluid supply line 102s and the working fluid return line 102r and the first circulation line 104a and the second circulation line 104b. The first on-off valve 31a and the second on-off valve 31b are manual stop valves. Of these, the first on-off valve 31a is provided in the working fluid supply line 102s and opens and closes the working fluid supply line 102s. The second on-off valve 31b is provided in the working fluid return line 102r and opens and closes the working fluid return line 102r.

[0019] These first on-off valve 31a and second on-off valve 31b make it possible to control the circulatory supply of the working fluid [F] to the rod rotating cylinder 105 that opens and closes each of the valves 10 to be operated.

[0020] [First branch pipe 32a and second branch pipe 32b] The first branch pipe 32a and the second branch pipe 32b are part of the piping for circulating the working fluid [F] between the pressure pump 101 and each rod rotation cylinder 105. The first branch pipe 32a and the second branch pipe 32b are high-pressure hoses connected to the working fluid supply line 102s and the working fluid return line 102r via the first on-off valve 31a and the second on-off valve 31b.

[0021] Of these, first branch pipe 32a branches into two from its base end on the first on-off valve 31a side toward its tip, with the branched tips connected to first three-way valve 33a and second three-way valve 33b. Second branch pipe 32b branches into two from its base end on the second on-off valve 31b side toward its tip, with the branched tips connected to first three-way valve 33a and second three-way valve 33b. First branch pipe 32a and second branch pipe 32b are preferably made of high-pressure hoses made of silicone rubber.

[0022] [First three-way valve 33a and second three-way valve 33b] The first three-way valve 33a and the second three-way valve 33b are connected to the first branch pipe 32a and the second branch pipe 32b and the first circulation line 104a and the second circulation line 104b. These first three-way valves 33a and 33b are manually operated ball valves. The first three-way valve 33a is connected to one end of the branched first branch pipe 32a, one end of the branched second branch pipe 32b, and the first circulation line 104a, connecting two of these. The second three-way valve 33b is connected to the other end of the branched first branch pipe 32a, the other end of the branched second branch pipe 32b, and the second circulation line 104b, connecting two of these.

[0023] These first three-way valve 33a and second three-way valve 33b reverse the circulation direction of the working fluid [F] to the rod rotating cylinder 105 described below, allowing the rotational motion of the rod rotating cylinder 105 to be switched between forward and reverse.

[0024] <First Circulation Line 104a and Second Circulation Line 104b> The first circulation line 104a and the second circulation line 104b are part of the piping for circulating the working fluid [F] between the pressure pump 101 and each rod rotating cylinder 105. These first circulation line 104a and second circulation line 104b are provided for each valve unit 103u and are high-pressure resistant hoses for circulating and supplying the working fluid [F] to the rod rotating cylinder 105, which will be described next.

[0025] The first circulation line 104a is connected at its base end to the first three-way valve 33a, and the second circulation line 104b is connected at its base end to the second three-way valve 33b. The first circulation line 104a and the second circulation line 104b are connected to each other at their distal ends and configured as a continuous tubular body. As a result, the working fluid [F] circulating through the first circulation line 104a and the second circulation line 104b can reverse its circulation direction by controlling the first three-way valve 33a and the second three-way valve 33b. The first circulation line 104a and the second circulation line 104b are preferably configured as high-pressure hoses made of silicone rubber.

[0026] The first circulation line 104a and the second circulation line 104b are each provided with a relief valve 104s. The relief valves 104s are valves that open when a predetermined pressure is exceeded, and are provided at positions before and after the rod rotating cylinder 105, sandwiching the rod rotating cylinder. Each relief valve 104s is connected to a discharge line 104e. As a result, when either the first circulation line 104a or the second circulation line 104b becomes overpressurized and the internal pressure exceeds a predetermined pressure, the working fluid [F] in the first circulation line 104a or the second circulation line 104b is discharged from the discharge line 104e via the relief valve 104s.

[0027] <Rod rotating cylinder 105> The rod rotating cylinder 105 converts the fluid pressure of the circulating working fluid [F] into rotational motion, and the direction of rotation is controlled by the direction of circulation of the working fluid [F]. Such a rod rotating cylinder 105 is provided so as to be coupled to the valve handle or the power transmission gear inside the drive unit of the operated valve 10, which is the torque input end 10h of each operated valve 10. In this way, the rotational motion generated by the rod rotating cylinder 105 is transmitted to the operated valve 10, enabling the opened and closed operation of the operated valve 10.

[0028] The rod rotating cylinder 105 is provided in a one-to-one relationship with the valve 10 to be operated and the valve unit 103u, and the first circulation line 104a and the second circulation line 104b drawn out from the valve unit 103u are connected within the rod rotating cylinder 105. The rod rotating cylinder 105 thus installed is connected to the valve 10 to be operated so as to open the valve 10 to be operated when the working fluid [F] circulates from the first circulation line 104a to the second circulation line 104b, and close the valve 10 to be operated when the working fluid [F] circulates in the opposite direction.

[0029] ≪Valve remote control method-1≫ Next, an operation for opening and closing the target valve 10 will be described as a procedure for remotely operating the target valve 10 using the above-described valve remote operating device 100. Note that this remote operating method assumes that the valves constituting the valve remote operating device 100 are operated manually.

[0030] <Specifying the open / closed state of the valve 10 to be operated> First, an operator instructs whether each of the multiple operation target valves 10 should be opened or closed by switching the first and second on-off valves 31a and 31b, the first and second branch pipes 32a and 32b, and the first and second three-way valves 33a and 33b on and off. Here, it is assumed that the operator manually switches the first and second on-off valves 31a and 31b, the first and second branch pipes 32a and 32b, and the first and second three-way valves 33a and 33b on and off, thereby opening some of the multiple operation target valves 10' and closing other operation target valves 10" in the open state.

[0031] <Control to open the valve 10' to be operated> The first and second on-off valves 31a and 31b, the first and second branch pipes 32a and 32b, and the first and second three-way valves 33a and 33b are manually switched on and off, and the valve unit 103u' corresponding to the target valve 10' designated to be open is controlled as follows.

[0032] Both the first on-off valve 31a and the second on-off valve 31b of the valve unit 103u' are manually opened. If the first on-off valve 31a and the second on-off valve 31b are already opened, this operation is omitted.

[0033] Furthermore, the first branch pipe 32a and the first circulation line 104a are connected by the first three-way valve 33a of the valve unit 103u', and the second branch pipe 32b and the second circulation line 104b are connected by the second three-way valve 33b. The first three-way valve 33a and the second three-way valve 33b may be operated manually, and in this case, if the first three-way valve 33a and the second three-way valve 33b are already in such a state, this operation is omitted.

[0034] <Control to close the valve 10″ to be operated> On the other hand, the valve unit 103u" corresponding to the operation target valve 10" designated to be in the closed state is controlled as follows by manually switching on and off the first on-off valve 31a and the second on-off valve 31b, the first branch pipe 32a and the second branch pipe 32b, and the first three-way valve 33a and the second three-way valve 33b.

[0035] Both the first on-off valve 31a and the second on-off valve 31b of the valve unit 103u" are set to an open state. The first on-off valve 31a and the second on-off valve 31b may be operated manually, and in this case, if the first on-off valve 31a and the second on-off valve 31b are already in an open state, this operation is omitted.

[0036] Furthermore, the first three-way valve 33a of the valve unit 103u″ connects the second branch pipe 32b to the first circulation line 104a, and the second three-way valve 33b connects the first branch pipe 32a to the second circulation line 104b. Note that if the first three-way valve 33a and the second three-way valve 33b are already in such a state, this operation is omitted.

[0037] <Operation of pressure pump 101> After the above-described control, the worker operates the pressure pump 101, which is the standby operating unit. If the pressure pump 101 is a portable pressure pump, the pressure pump 101 is connected to the working fluid supply line 102s and the working fluid return line 102r and operated. The pressure pump 101 is operated manually or electrically using a standby power source.

[0038] <Operation of the valve remote control device 100> As a result of the above, the working fluid [F] is supplied from the working fluid supply line 102s to the working fluid branching mechanism 103, as shown by the arrows in the figure. Then, the rod rotating cylinder 105' connected to the operation target valve 10' designated to be in the open state and the rod rotating cylinder 105" connected to the operation target valve 10" designated to be in the closed state operate as follows.

[0039] [Opening operation of the valve 10' to be operated] That is, in the valve unit 103u' corresponding to the operation target valve 10' designated to be in the open state, the working fluid [F] is supplied to the first circulation line 104a via the first on-off valve 31a and the first three-way valve 33a, and flows from the first circulation line 104a to the second circulation line 104b, as shown by the arrows in the figure. Furthermore, the working fluid [F] flows from the second circulation line 104b to the working fluid return line 102r via the second three-way valve 33b and the second on-off valve 31b, and is returned to the pressure pump 101 from the working fluid return line 102r.

[0040] Then, due to the flow of the working fluid [F] from the first circulation line 104a to the second circulation line 104b as described above, the rod rotating cylinder 105' rotates (forward) in a direction to open the operation target valve 10', and the operation target valve 10' is opened.

[0041] [Closing operation of valve 10] On the other hand, in the valve unit 103u" corresponding to the operation target valve 10" designated to be in the closed state, the working fluid [F] is supplied to the second circulation line 104b via the first on-off valve 31a and the second three-way valve 33b, as shown by the arrows in the figure, and flows from the second circulation line 104b toward the first circulation line 104a. Furthermore, the working fluid [F] flows from the first circulation line 104a toward the working fluid return line 102r via the first three-way valve 33a and the second on-off valve 31b, and is returned to the pressure pump 101 from the working fluid return line 102r.

[0042] Then, due to the flow of the working fluid [F] from the second circulation line 104b to the first circulation line 104a as described above, the rod rotating cylinder 105'' rotates (reversely) in the direction to close the operation target valve 10'', and the operation target valve 10'' is closed.

[0043] [Oil drainage due to overpressure] 2 is a diagram illustrating the operation of the valve remote control device 100 according to the embodiment, and is a diagram illustrating the operation of the relief valve 104s provided in the first circulation line 104a and the second circulation line 104b. Next, based on FIG. 2, the oil draining operation when the inside of the line of the valve remote control device 100 becomes overpressurized will be described.

[0044] By the above-described remote control, the operation target valve 10 is fully opened or fully closed at the respective timing. In this case, the input end 10h of the operation target valve 10, which is in the previous state or the fully closed state, is locked. As a result, excessive torque is generated at the input end 10h due to the driving of the rod rotating cylinder 105 connected to the locked input end 10h. Then, the rotational motion of the rod rotating cylinder 105 stops due to the resistance of the input end 10h, and the working fluid [F] supplied to the rod rotating cylinder 105 has nowhere to escape. As a result, the pressure in the line on the supply side of the working fluid [F] (the first circulation line 104a in the illustrated example) of the first circulation line 104a and the second circulation line 104b is increased.

[0045] When the pressure in the first circulation line 104a exceeds a predetermined pressure, the relief valve 104s provided in the first circulation line 104a opens, and the working fluid [F] in the first circulation line 104a is discharged through the discharge line 104e. This eliminates the overpressure state in the first circulation line 104a, preventing an increase in the pressure of the working fluid [F] supplied to the rod rotating cylinder 105 and an overtorque on the input end 10h of the operated valve 10.

[0046] ≪Valve remote control method-2≫ Next, as a procedure for remotely operating the operation target valve 10 by the above-described valve remote operation device 100, a procedure for confirming whether the operation target valve 10 is fully open or fully closed will be described with reference to Figures 1 and 2. This procedure is performed a predetermined time after the operation for opening or closing the operation target valve 10 has been performed as described above. Here, the predetermined time is, for example, a time sufficient for the operation target valve 10 to be fully opened or fully closed after the pressure pump 101 is operated while the valve unit 103u is controlled.

[0047] In this case, after the above-mentioned time has elapsed, the operator closes the first on-off valve 31a and the second on-off valve 31b of the valve unit 103u corresponding to the remaining operation target valves 10, leaving one operation target valve 10 remaining.

[0048] This closes the first on-off valve 31a and the second on-off valve 31b of the corresponding valve unit 103u, and causes the working fluid [F] to circulate only through the first circulation line 104a and the second circulation line 104b extended from one valve unit 103u.

[0049] When the operation target valve 10 corresponding to the one valve unit 103u is in a fully open or fully closed state due to this operation, the input end 10h of the operation target valve 10 is locked, causing overtorque. Then, the working fluid [F] supplied to the rod rotating cylinder 105 corresponding to the one operation target valve 10 is discharged from the discharge line 104e, as described in the oil discharge operation due to the overpressure state. Therefore, the discharge of the working fluid [F] from the discharge line 104e allows the operator to confirm that the one operation target valve 10 is in a fully open or fully closed state.

[0050] <Nuclear Plant> 3 is a configuration diagram of a nuclear power plant 1 according to an embodiment, which is equipped with the previously described valve remote operation device 100. The nuclear power plant 1 shown in this figure has a reactor pressure vessel 11, a reactor containment vessel 12 that houses the reactor pressure vessel 11, and a reactor building 13 that houses the reactor containment vessel 12. The nuclear power plant 1 also includes a filtered vent device 14, a connecting pipe 15 connected to the filtered vent device 14, an isolation valve 10a provided in the connecting pipe 15, and the valve remote operation device 100.

[0051] <Filter vent device 14> The filtered vent device 14 is installed as a measure to prevent overpressure failure of the reactor containment vessel 12 in the event of an accident in which core damage to the reactor pressure vessel 11 is unavoidable. This filtered vent device 14 is located outside the reactor building 13, and prevents the release of radioactive materials into the atmosphere by venting gas that flows in from the reactor containment vessel 12 via connecting piping 15 through a filter into the atmosphere. The introduction of gas from the reactor containment vessel 12 into the filtered vent device 14 is carried out by operating an isolation valve 10a provided on the connecting piping 15, which will be explained below.

[0052] <Connection pipe 15> The connection pipe 15 connects the reactor containment vessel 12 inside the reactor building 13 to the filter vent device 14 outside the reactor building 13. The connection pipe 15 is connected to, for example, multiple locations on the reactor containment vessel 12, integrated inside the reactor building 13, and pulled out to the outside of the reactor building 13 and connected to the filter vent device 14.

[0053] <Isolation valve 10a> The isolation valve 10a is a target valve that is remotely operated by the previously described valve remote operating device 100. Therefore, detailed description of the isolation valve 10a will be omitted here. This isolation valve 10a is provided for the connecting pipe 15 and allows the connecting pipe 15 to be opened and closed between the reactor containment vessel 12 and the filtered vent device 14. In the illustrated configuration, the isolation valves 10a are arranged in two stages at each branch point of the connecting pipe 15: a primary isolation valve 10a-1 on the reactor containment vessel 12 side and a secondary isolation valve 10a-2 on the filtered vent device 14 side. The branch points of the connecting pipe 15 are configured to be connected between the primary isolation valve 10a-1 and the secondary isolation valve 10a-2.

[0054] As a result, even if all of the isolation valves 10a are not open, only one of the two primary isolation valves 10a-1 is open and only one of the two secondary isolation valves 10a-2 is open, thereby making it possible to establish communication between the reactor pressure vessel 11 and the filter vent device 14.

[0055] During normal operation, such isolation valves 10a are set to cut off the connection between the reactor containment vessel 12 and the filter vent device 14, for example, all of them are used in a closed state, and no gas is released from the filter vent device 14.

[0056] <Valve remote control device 100> The valve remote control device 100 is used to remotely operate the isolation valve 10a when power is lost in the nuclear plant 1, and has the configuration described above, so a detailed description will be omitted here. In the nuclear plant 1, a portion of this valve remote control device 100 is placed in a shielded area 13a separated by a shielding wall within the reactor building 13, and is configured to ensure the safety of workers during manual operation.

[0057] Therefore, the pressure pump 101 and the working fluid branching mechanism 103 of the valve remote control device 100 are disposed within the shielded area 13a. Although not shown here, the relief valve 104s (see FIGS. 1 and 2) may be provided either within or outside the shielded area 13a.

[0058] Furthermore, in the valve remote control device 100 installed in the nuclear plant 1, the first on-off valve 31a and the second on-off valve 31b (see FIG. 1) are preferably kept closed during normal operation. This stops the circulatory supply of the working fluid [F] to the rod rotating cylinder 105 for opening and closing the isolation valve 10a, and prevents malfunction of the pressure pump 101 during normal operation from affecting the isolation valve 10a.

[0059] Furthermore, in the valve remote control device 100 provided in the nuclear plant 1, the first three-way valve 33a and the second three-way valve 33b (see FIG. 1) may be in either connection state during normal operation. However, in order to quickly switch from the normal operation state to the state when gas is released from the filter vent device 14, it is preferable that the first three-way valve 33a connects the first branch pipe 32a to the first circulation line 104a, and the second three-way valve 33b connects the second branch pipe 32b to the second circulation line 104b.

[0060] <Remote Operation to Open the Isolation Valve 10a (When Gas is Released from the Filter Vent Device 14)> 4 is a diagram for explaining remote operation (part 1) of the isolation valve 10a by the valve remote operation device 100 according to the embodiment, specifically, for explaining remote operation for opening the isolation valve 10a from a normal operation state. This remote operation is performed when an overpressure failure of the reactor containment vessel 12 is predicted, and the reactor containment vessel 12 and the filtered vent device 14 are connected to each other by opening the isolation valve 10a.

[0061] In this case, of all the isolation valves 10a, for example, at least one primary isolation valve 10a-1 and one secondary isolation valve 10a-2 (see FIG. 3) are opened. Alternatively, all the isolation valves 10a may be designated to be opened. As a result, as described in the valve remote control method above, the isolation valves 10a designated to be opened among the isolation valves 10a that are the valves to be operated are opened, and the reactor containment vessel 12 and the filtered vent device 14 are connected by the connecting piping 15. Then, the gas [G] that has flowed from the reactor containment vessel 12 into the connecting piping 15 can be released from the filtered vent device 14, as indicated by the outlined arrow in the figure.

[0062] In the above remote operation, if there are any isolation valves 10a that are not designated to be in the open state, the first opening / closing valves 31a and second opening / closing valves 31b of the valve units 103u corresponding to these isolation valves 10a will be in the closed state.

[0063] <Remote operation to close isolation valve 10a> FIG. 5 is a diagram for explaining remote operation (part 2) of an isolation valve by the valve remote operation device 100 according to the embodiment, and is a diagram for explaining remote operation for closing the isolation valve 10a that is in an open state.

[0064] In this case, the worker closes, for example, all of the isolation valves 10a. As a result, as explained in the previous method for remotely operating a valve, the isolation valves 10a that are the target valves to be operated and that are designated to be closed are opened, and the connecting pipe 15 between the reactor containment vessel 12 and the filtered vent device 14 can be shut off.

[0065] Effect of the embodiment According to the embodiment described above, it is possible to operate multiple target valves 10 by operating one pressure pump 101, which is an auxiliary operating unit. By providing a first three-way valve 33a and a second three-way valve 33b at each branch point of the piping for the working fluid [F] and making it possible to switch the circulation direction of the working fluid [F] relative to the rod rotating cylinder 105, it is possible to remotely open and close multiple target valves simultaneously or individually by operating only one pressure pump 101, which is an auxiliary operating unit. As a result, it is possible to reduce the introduction cost of the valve remote operating device 100 and the number of people required for operation.

[0066] Furthermore, since the operation is performed by the fluid pressure of the working fluid [F], which is an incompressible fluid, the loss of driving force is small, so there are few restrictions on the distance that can be remotely controlled, and operation with high response speed is possible.

[0067] The present invention is not limited to the above-described embodiments and modifications, and includes various other modifications. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment, or to add the configuration of another embodiment to the configuration of one embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of each embodiment with other configurations. [Explanation of symbols]

[0068] 1. Nuclear power plant 10, 10', 10"...Operated valve 10a...Isolation valve (operated valve) 10a-1... Primary isolation valve (operated valve) 10a-2...Secondary isolation valve (operated valve) 12...Reactor containment vessel 13a...Shielded area 14...Filter vent device 15...Connecting piping 31a...First opening / closing valve 31b...Second on-off valve 32a...First branch pipe 32b...Second branch pipe 33a...First three-way valve 33b...Second three-way valve 100...Valve remote control device 101...Pressure pump 102r...Working fluid return line 102s...Working fluid supply line 103u, 103u', 103u"...Valve unit 104a...First circulation line 104b...Second circulation line 104s...Relief valve 105, 105', 105"...Rod rotating cylinder

Claims

1. A valve remote control device for remotely controlling a plurality of valves to be operated by a main control unit using a backup control unit, a pressure pump used as the auxiliary operating unit for circulating the working fluid; a plurality of rotating rod cylinders provided corresponding to the valves to be operated, which rotate in a direction corresponding to the circulating direction of the working fluid to open and close the valves to be operated; a pipe for circulating the working fluid between the pressure pump and the plurality of rod rotating cylinders, the piping includes a supply line for sending out the working fluid from the pressure pump, a return line for returning the working fluid to the pressure pump, and a circulation line connected to the supply line and the return line for circulating the working fluid to each of the rod rotation cylinders, an on-off valve is provided at each connection between the supply line and the return line and the circulation line; A relief valve that opens at a certain pressure is provided on the upstream and downstream sides of each of the rod rotating cylinders in the circulation line. Valve remote control device.

2. The piping is provided so as to branch into a plurality of pipes extending from the pressure pump to the plurality of rod rotating cylinders, and distributes and circulates the working fluid to the plurality of rod rotating cylinders. The valve remote control device according to claim 1 .

3. the piping includes a supply line that sends out the working fluid from the pressure pump, a return line that sends the working fluid back to the pressure pump, and a circulation line that is connected to the supply line and the return line and that circulates the working fluid to each of the rod rotation cylinders; a three-way valve for switching the connection of the supply line and the return line to the circulation line to reverse the circulation direction of the working fluid to each of the rod rotation cylinders; The valve remote control device according to claim 1 .

4. The three-way valve is a manually operated ball valve. The valve remote control device according to claim 3.

5. The working fluid is an incompressible fluid The valve remote control device according to claim 1 .

6. The pressure pump is a manual pump. The valve remote control device according to claim 1 .

7. A valve remote control device according to any one of claims 1 to 6; A reactor containment vessel; a filter vent device; a connecting pipe that communicates the reactor containment vessel with the filter vent device; an isolation valve for opening and closing the connecting pipe; The isolation valve is the target valve to be remotely operated by the valve remote operation device. Nuclear power plant.

8. A part of the valve remote control device is isolated from the reactor containment vessel by an isolation wall. The nuclear power plant according to claim 7.

9. The pressure pump is isolated from the reactor containment vessel by an isolation wall. The nuclear power plant according to claim 7.

10. The isolation valve, which is the valve to be operated, is an electric valve that uses the rotational movement of the rod rotating cylinder as a backup torque source. The nuclear power plant according to claim 7.

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