JPS6314799B2 - - Google Patents

Description

Detailed Description of the Invention The present invention provides a power source for reactor shutdown auxiliary equipment used to operate a nuclear reactor safely and reliably.
The present invention relates to a nuclear reactor shutdown control device that is economically realized by controlling the opening and closing of circuit breakers.

Traditionally, nuclear power plants have installed remote control panels that can shut down the reactor independently of the central control panel in order to increase system reliability in case the central control panel malfunctions and becomes inoperable. It was set up. Therefore, the circuit breaker that controls the opening and closing of power to the reactor shutdown auxiliary equipment can be operated from either the central control panel or the remote control panel. Therefore, the circuit breaker operating power and the circuit breaker control power are supplied from a predetermined DC power source through two paths. For example, as shown in FIG. 1, the first path is from the DC power source 1. It is connected to switch KS1 of remote control switchboard 2 via cable A, and its output is connected to fuses 8a, 8b, 8g,
8h, and is further input to a changeover switch 6f provided on the remote control panel 6, and the second path is connected to the cable B from the DC power supply 1. It is connected to switch KS2 of remote control panel 6, and its output is sent to changeover switch 6 via fuses 8J, 8K, 8L, and 8M.
It was supposed to be input to f. Further, the output of the changeover switch 6f is input to the circuit breaker closing spring storage motor 9, circuit breaker closing relay 10, and circuit breaker tripping relay 13 of the remote control distribution board 2 via the cable C, and the cable D A changeover switch 6g provided on the remote control panel 6 via
6h, and its output was connected to operation switches 12a and 12b as well as operation switches 11a and 11b provided in central control panel 11 via cable E. . Thus, when the operator operates the operation switches 11a to 12b, the circuit breaker closing spring storage motor 9 and the circuit breaker closing relay 10 or the circuit breaker tripping relay 13 are activated, and the circuit breaker 14 is activated.
Accordingly, the power supply 1' of the reactor shutdown auxiliary equipment 15 was controlled to open and close.

However, the above-mentioned DC power supply 1, remote control distribution board 2, remote control panel 6, etc. are often installed at separate locations, and in particular, the total length of the cable C connecting the remote control panel 6 and the remote control distribution board 2 ( The disadvantage was that the total wiring length (total wiring length) was several thousand meters because the same type of signals were traveling back and forth. Furthermore, the solenoid excitation current for closing the circuit breaker and the starting current for the circuit breaker closing spring storage motor must be supplied to such a long cable, but these currents generally have a large capacity of 60 to 70A. Since large-diameter cables are required, the cable wiring work increases, and the cable wiring equipment becomes huge, resulting in extremely high construction costs. Therefore, an object of the present invention is to provide a nuclear reactor shutdown control system that is free from the above-mentioned drawbacks and problems.

This invention will be explained below.

In FIG. 2 showing an embodiment of the present invention, a DC power supply 1, fuses 8a to 8h, a circuit breaker closing spring storage motor 9, a limit switch 9a, a circuit breaker closing relay 10, a central control panel 11, and an operation switch 1 are shown.
1a to 12b, circuit breaker tripping relay 13, circuit breaker 1
4. The reactor shutdown auxiliary equipment 15 and its power supply 1' are the same devices as described above, and the output of the DC power supply 1 is input to the contact 4 provided on the remote control switchboard 2' via cable A. cable
It is also input to the changeover switch 6a provided on the remote control panel 6' via B', and its output is sent to the cable
The signal is input to the power switching relay 3 via C' and is also input to the contact 7. Further, the outputs of the contacts 4 and 7 are connected to a limit switch 9a via fuses 8b and 8d provided in the circuit breaker control device 5, and are also connected to a remote control panel 6' via a cable D. It is also input to changeover switches 6b and 6c, the outputs of which are connected to one ends of operation switches 11a and 12a, respectively. The other ends of the operating switches 11a and 12a are connected to each other by a cable E, and are input to the circuit breaker closing relay 10 via the cable D, and the output thereof is connected to the circuit breaker closing spring storage motor 9. It is connected to contacts 4 and 7 via fuses 8e and 8g. In addition, the outputs of contacts 4 and 7 are combined into one via fuses 8a and 8c, and are both input to changeover switches 6d and 6e via cable D, and the output of switch 6d is transferred via cable E to the operation switch. The output of the switch 6e is connected to one end of the operating switch 12b.
Thus, the other ends of the operating switches 11b and 12b are connected to each other by the cable E, and the circuit breaker tripping relay 13 is connected via the cable D.
The outputs thereof are connected to contacts 4 and 7 via fuses 8h and 8f, respectively.

To explain the operation in such a configuration, in the normal state, the changeover switch 6a is opened, and the changeover switches 6b to 6e linked thereto close the switches 6b and 6d, and the central control panel 1
1 operation switches 11a and 11b are selected,
The switches 6c and 6e are opened and the operating switches 12a and 12b of the remote control panel 6' are disconnected from the remote control distribution panel 2'. When the operation switch 11a of the central control panel 11 is closed, the circuit breaker closing relay 10 is energized, the circuit breaker 14 is closed by the accumulated force of the closing spring (not shown), and the reactor shutdown auxiliary equipment 15 is connected to the power source 1. ′ is supplied. Thus,
When the operating state of the closing spring is detected, the limit switch 9a is closed, and the circuit breaker closing spring storage motor 9 is activated. When a predetermined stored force is applied to the closing spring, the limit switch 9a is opened and the circuit breaker is activated. The closing spring energy storage electric motor 9 is stopped. In addition, when stopping the operation of the reactor shutdown auxiliary equipment 15, the operation switch 11b of the central control panel 11 is closed by the operator, and the circuit breaker tripping relay 13 is energized via cable E and cable D. Trip control of the circuit breaker 14 is performed.

On the other hand, if a failure is detected in the signal system of the central control panel 11 and the reactor shutdown auxiliary equipment 15 cannot be started or stopped, the changeover switch 6a of the remote control panel 6' is closed, and the Changeover switches 6c and 6e are also closed, and changeover switch 6
b, 6d are opened. Therefore, the operation switches 11a and 11b are disconnected from the remote control switchboard 2', and the operation switches 12a and 12b are connected to the relays 10 and 13, respectively. Then, the DC power source 1 is input to the power switching relay 3, and the contacts 4 are opened and the contacts 7 are closed.

Thus, when starting the reactor shutdown auxiliary equipment 15, the operation switch 12a provided on the remote control panel 6' is turned on, and the DC power supply 1→cable B'→
Transfer switch 6a → cable C' → contact 7 → fuse 8d → cable D → transfer switch 6c → operation switch 12a → cable D → circuit breaker closing relay 1
The circuit breaker closing control power is supplied through the path 0→fuse 8e, and the same circuit breaker closing control as in the case of the operation switch 11a is executed. On the other hand, when shutting down the reactor shutdown auxiliary equipment 5, the operation switch 12b provided on the remote control panel 6' is closed, and in the same manner as described above, the contact 7 → fuse 8c → cable D → changeover switch 6e → operation Circuit breaker tripping control power is supplied through the path of switch 12b→cable D→breaker tripping relay 13→fuse 8f, and circuit breaker tripping control similar to that of the operation switch 11b is executed.

In FIG. 3, which shows another embodiment of the present invention in correspondence with FIG. 2, devices with the same numbers are similar devices, and the solenoid closing switch 20a is the same as the circuit breaker closing relay 10. The solenoid coil 20 is actuated by an excitation current to supply circuit breaker closing control power to the solenoid coil 20. Therefore, in the control device shown in FIG. 3, when the operating switch 11a or 12a is turned on,
When the relay 10 is energized, the closing switch 20
a is closed, the circuit breaker 14 is closed by operating the solenoid 20, and the reactor shutdown auxiliary equipment 15 is activated.

As explained above, according to the nuclear reactor shutdown control device of the present invention, the number of cables C' required to connect the remote control panel 6' and the remote control distribution panel 2' can be significantly reduced. It is economical because the cable length can be shortened, cable wiring work can be reduced, and cable material costs can also be saved.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of a conventional nuclear reactor shutdown control system, and FIGS. 2 and 3 are circuit diagrams each showing an embodiment of the present invention. 1, 1'...power supply, 2,2'...remote control switchboard,
3,10,13...Relay, 4,7...Contact, 6,
6'...Remote control panel, 6a to 6h, 9a, 11a,
11b, 12a, 12b, 20a...Switch, 8
a~8h... Fuse, 9... Electric motor, 11... Central control panel, 14... Circuit breaker, 15... Reactor shutdown auxiliary equipment, 2
0...Solenoid.

Claims (1)

[Claims] 1. In a reactor shutdown control device that controls the opening and closing of circuit breakers connected to a central control panel and a remote control panel to start and stop specified reactor shutdown auxiliary equipment, the remote control panel is equipped with a power changeover switch. a power supply switching circuit for supplying a predetermined control power to the central control panel or the remote control panel in response to a control signal output from the power supply switching switch; a closing means for the circuit breaker that selects a closing signal output from the central control panel or the remote control panel to start the reactor shutdown auxiliary equipment; 1. A nuclear reactor shutdown control device comprising: a remote control switchboard equipped with tripping means for the circuit breaker that selects a tripping signal output from the control panel and shuts down the reactor shutdown auxiliary equipment.