JPH0312595A - Nuclear reactor stopping device outside central control room - Google Patents

Abstract

PURPOSE:To prevent electrical influence such as short-circuit and grounding at the control side of a central control room affected on a load side by performing the transmission of an operation signal between a central control room control board and a remote operation stopping control board outside central control room in optical multiplex transmission. CONSTITUTION:When a state where an operator cannot approach the central control room occurs, the operator switches a mode change-over switch 5 arranged at the remote operation stopping control board 42 outside central control room to an (RSS) side. Thereby, the contacts 14, 19 and 21 of the mode change-over switch 5 are closed, and the contacts 15, 18 and 20 are opened. As a result, a green lamp 32 and a red lamp 33 for operation display are connected to a DC motor control center 3 similarly as the operating switch 31 of a DC pump motor 4 arranged on the control board 42. Instead of that, since the operation signal from the control board 41 at the central control room is separated, the motor 4 can be operated and controlled with the control board 42 hereafter similarly as in the operation of the control board 41. Since the contact of the switch 5 is opened, no influence of an error signal is applied on the control center 3 even when it is outputted due to a fault in a multiplex transmitter 43, etc.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention provides remote manual control from a remote control stop control panel outside the central control room when a situation occurs where operators cannot access the main control room. This invention relates to a central control room outdoor nuclear reactor shutdown device that controls auxiliary equipment required for reactor shutdown through operation and safely brings the reactor to a cold shutdown from a scram state.

(Prior Art) FIG. 2 shows a circuit diagram of a conventional nuclear reactor shutdown device outside a central control room, and shows, for example, a case where one of a plurality of pump motors is driven by a DC power source.

That is, a central control room control panel 1 disposed inside the central control room, a central control room external remote control stop control panel 2 disposed outside the central control room, a load DC pump motor 4, and a control device for this load. The DC motor control center 3 is a direct current motor control center 3, and the operator's operation is transferred from the central control room control panel 1 to the remote control stop control panel 2 outside the central control room, or from the remote control stop control panel 2 outside the central control room to the central control room control panel 1. A mode changeover switch 5 disposed on the remote control stop control panel 2 outside the central control room for switching, and a control multicore cable 6 connecting between the central control room control panel 1 and the remote control stop control panel 2 outside the central control room.
The main part is composed of a control multi-core cable 7 that connects the remote control stop control panel 2 outside the central control room and the DC motor control center 3.

The DC motor control center 3 includes a DC bus 22 that drives the DC pump motor 4 and a main contact 2 of an electromagnetic contactor that controls the supply of DC power to the DC pump motor 4.
6, a control center control circuit 27 that controls opening and closing of the main contact 26 of the electromagnetic contactor by energizing and de-energizing the coil of the electromagnetic contactor, this control center control circuit 27, and a control multicore cable. 7. A fuse 24 for preventing short circuits, ground faults, etc. in the remote control stop control panel 2 outside the central control room, the control multicore cable 6, and the central control room control panel 1 from spreading to the DC bus 22;
25, and an electromagnetic breaker 23 that prevents short circuits, ground faults, etc. between the DC motor control center 3 and the DC pump motor 4 from spreading to the DC bus 22.

The central control room control panel 1 also includes the DC pump motor 4.
and the main contact 2 of the electromagnetic contactor to indicate that the DC pump motor 4 is stopped.
A green lamp 29 that lights up when the contactor 6 is in an open state, and a red lamp 30 that indicates that the DC pump motor 4 is activated and lights up when the main contact 26 of the electromagnetic contactor is in a closed state are provided. These are connected to contacts 12, 15, 16, 18, 20 of the mode changeover switch 5 in the remote control stop control panel 2 outside the central control room via a control multi-core cable 6.

Furthermore, the remote control stop control panel 2 outside the central control room also includes an operation switch 31, a green lamp 32, and a red lamp 3 for operating the DC pump motor 4, similar to the central control room control panel 1.
3 are arranged, and these are the contacts of the mode changeover switch 5! 3.14.17.1.9.2]. And the contacts 12.13.1 of the mode changeover switch 5
．． 4.15.16.17.18.19.20.21 are connected to a control center control circuit 27 in the DC motor control center 3 via a control multicore cable 7.

The control power supply for the control center control circuit 27 is connected to the contacts 8, 9, 10, 1 of the mode changeover switch 5 in the remote control stop control panel 2 outside the central control room via the control multi-core cable 7.
1, and the contact 8 of the mode selector switch 5,
Reference numeral 9 denotes a DC power supply 3 independent from the DC motor control center 3 installed in the remote control stop control panel 2 outside the central control room.
Connected to 4.

In addition, contacts 10 and 11 of the mode changeover switch 5 are connected to the DC motor control center 3 via a control multicore cable 7.
It is connected to fuses 24 and 25 in
4.25 is connected to the DC bus 22 via the electromagnetic circuit breaker 23.

The mode selector switch 5 disposed on the remote control stop control panel outside the central control room 2 is a two-position switch of "R85-Central Control"("R5S" indicates the remote control stop control panel outside the central control room, "Central Control"). indicates the central control room), and this mode selector switch 5 is turned on to the ``central operation'' side during normal operation of the nuclear reactor plant. In addition, in FIG. 2, the contact, convex 8, 9, to, 1 of the mode changeover switch 5
1.12.13.14.15.16.17゜18, 19
．． 20.21 is open/closed when the mode selector switch 5 is
The figure shows the case where the switch is switched to the central operation side. At this time, contacts 10.11.12.15.J, 6.' 18°20 are closed, and contacts 8.9.13.14.17. 19
．． 21 is open circuited.

That is, in this case, the control center control circuit 27
The control power source is connected to contacts 10 and 11 of the mode selector switch 5.
Power is supplied from a DC bus 22 in the DC motor control center 3 via the DC motor control center 3.

Moreover, the opening and closing of the operation switch 28 of the central control room control panel 1 is transmitted as an electric signal to the control center control circuit 27, which controls the opening and closing of the main contact 26 of the electromagnetic contactor. The open/close state of the main contact 26 of the electromagnetic contactor (indicating the running or stopping state of the DC pump motor 4) is determined by the electrical signal from the control center control circuit 27, and the green lamp 29 or The information is displayed to the operator by turning on and off the red lamp 30. At this time, the contacts 13, 14, 17, 19, 2 of the mode changeover switch 5
1 is open, so the control center control circuit 2
7, the DC pump motor 4 does not start or stop even if the operation switch 31 of the remote control stop control panel 2 outside the central control room is operated, and the green lamp 32 does not start or stop.
Both the red lamp 33 and the red lamp 33 are off.

In the main control room external reactor shutdown system configured as described above, if a situation arises in which the operator cannot access the main control room, the mode selector switch 5 of the central control room external remote operation shutdown control panel 2 can be turned on. By inputting the power to the R5S side, the DC pump motor 4 can be controlled from the remote control stop control panel 2 outside the central control room.

That is, in this case, the contact 12. of the mode changeover switch 5.
15, 16, 18, and 20 are opened, the central control room control panel 1 is electrically disconnected from the control center control circuit 27, and the central control room control panel 1 and control multicore cable 6 are short-circuited, grounded, Mode selection switch 5 regardless of whether it is open or not
The contacts 13, 14, 17, 19, and 21 are closed, and the operation switch 31, green lamp 32, and red lamp 33 provided on the remote control stop control panel 2 outside the central control room are connected to the control center control circuit 27, respectively. be done.

In addition, in the reactor shutdown system outside the central control room configured as described above, while the operator moves from the central control room to the remote control shutdown control panel 2 outside the central control room, the central control room control panel 1 and the control multi-core cable Even if the fuses 24 and 25 in the DC motor control center 3 are blown out due to a short circuit or a ground fault in the main control room 6, and the power supply for control of the control center control circuit 27 is lost, the remote control stop control panel 2 outside the central control room By turning the selector switch 5 to the "R3S" side, the contacts 10 and 11 are opened regardless of the state of the fuses 24 and 25, and the control center control circuit 27 is connected to the DC bus 22 power supply in the DC motor control center 3. By closing the contact 8.9 without supplying power to the main control room, the control power is supplied to the control center control circuit 27 from the DC power supply 34 provided in the remote control stop control panel 2 outside the central control room. The DC pump motor 4 can be controlled by a remote control stop control panel 2 outside the central control room.

(Problem to be Solved by the Invention) However, in an actual nuclear reactor plant, a large number of auxiliary equipment such as pumps and circuit breakers are required to safely bring the reactor to cold shutdown from the scram state. It is necessary to apply a reactor shutdown device outside the central control room as shown in the figure to each of these auxiliary machines.

For this reason, in the conventional nuclear reactor shutdown system outside the central control room, DC and AC power supplies are provided as control power supplies for the control center control circuit 27 in the remote control shutdown control panel 2 outside the central control room, and one mode switching Since there is a limit to the number of contacts of the switch 5, it is necessary to install one mode changeover switch for one to three auxiliary machines, and at the same time the size of the remote control stop control panel 2 outside the central control room increases.
When an operator operates the system using the remote control stop control panel 2 outside the central control room, it is necessary to switch a large number of mode changeover switches S, which poses a problem in that the burden on the operator becomes extremely large. Furthermore, the control center control circuit 2
7 with a control center control circuit that does not require a remote stop operation outside the central control room, it requires a circuit that receives DC power from the remote stop control panel 2 outside the central control room, which poses the problem of loss of compatibility. Ta.

The present invention has been made in response to such conventional circumstances,
The first purpose is to reduce the number of all mode changeover switches, reduce the size of the remote control stop control panel outside the central control room, and reduce the burden on the operators who operate it. The third purpose is to eliminate the DC power supply and AC power supply required in the remote control stop control panel outside the central control room, or to reduce their capacity; and the third purpose is to eliminate the need for remote stop control outside the central control room. An object of the present invention is to provide a nuclear reactor shutdown device outside a central control room, which is equipped with a control center control circuit, etc., which is compatible with switch gears, control center control circuits, etc. used to control various loads.

[Structure of the invention]

(Means for solving the problem) A central control system equipped with a multiplex transmission device that identifies and separates the contents of signals that indicate the status within the control panel and signals from the outside, and performs optical multiplexing to send and receive signals to and from the outside. A central control room control panel located indoors that remotely controls the reactor, as well as signals that indicate the status within the control panel and signals from outside, are identified and separated, optically multiplexed, and exchanged with the outside. a remote control stop control panel outside the central control room that is disposed outside the central control room and is equipped with a multiplex transmission device for remotely shutting down the reactor; a multiplex transmission device for the remote control stop control panel outside the central control room; It is equipped with an optical fiber cable that connects to the multiplex transmission device of the control room control panel.

(Operation) The operation location is selected using the mode selector switch located on the remote control stop control panel outside the central control room. Normally, when an operator operates an operation switch on the central control room control panel in the central control room, this operation switch and its opening/closing information are identified and separated in a multiplex transmission device, encoded, and then converted into an optical multiplex signal and sent to an optical fiber. It is transmitted via a cable to the multiplex transmission device of the remote control stop control panel outside the central control room. In the multiplex transmission equipment of the remote control stop control panel outside the central control room,
This signal is converted into an electric signal to control the operation switch of a predetermined load and its opening/closing information, and operates the corresponding output contact.
The operation and stop control of a load such as a DC pump motor is performed via the DC motor control center. At this time, the signal indicating the status of the DC pump motor is also transmitted in the same way as the opening/closing information of the operation switch, etc., and a predetermined indicator lamp is lit. do. In addition, when operating the remote control stop control panel outside the central control room,
After switching the mode changeover switch to the "'R5S" side, the operating switch on the remote control stop control panel outside the central control room is operated to directly control the DC motor control center without using the multiplex transmission device.

In any case, during operation, the operation switches in locations other than the relevant control panel are separated from the control circuit of the DC motor control, so they cannot be operated from multiple locations, and the operator is not present. For example, the effects of electrical circuit short circuits, ground faults, etc. in the central control room, which have become difficult, will not affect the operating DC motor control center, and since only one mode selector switch contact is required for one load. , the number of contacts in the mode changeover switch can be significantly reduced, the number of all mode changeover switches can be reduced, the shape of the installed control panel can be made smaller, and the burden on the operator can also be reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Note that the same components as those in the prior art described above are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 is a circuit diagram showing a central control room control panel 41 disposed in the central control room, a central control room external remote control stop control panel 42 disposed outside the central control room, and one of the plurality of loads, for example. The DC pump motor 4 of the stand, the DC motor control center 3 which is the control device for this load, and the operation of the operator are transferred from the central control room control panel 41 to the remote control stop control panel 42 outside the central control room, or by remote control outside the central control room. Remote operation outside the central control room for switching from the stop control panel 42 to the central control room control panel 41 Consists of a mode changeover switch 5 disposed on the stop control panel 42, which switches between the central control room control panel 41 and the remote control outside the central control room. Electrical/optical conversion multiplex transmission devices 43 and 44 are respectively installed on the panel 42, and signals are exchanged via optical fiber cables 45, which are interconnected transmission paths.

Further, the remote control stop control panel 42 outside the central control room and the DC motor control center 3 are connected by a control multi-core cable 7, and a DC bus 22 that drives the DC pump motor 4,
The main contact 26 of the electromagnetic contactor that controls the supply of DC power to the DC pump motor 4, and the control that controls the opening and closing of the main contact 26 of the electromagnetic contactor by energizing and de-energizing the coil of the electromagnetic contactor. Short circuits, ground faults, etc. in the center control circuit 27, this control center control circuit 27, the control multi-core cable 7, the central control room external remote control stop control panel 42, and the central control room control panel 41 may occur on the DC bus 2.
Fuse 24゜25 to prevent it from spreading to 2.
and an electromagnetic breaker 23 that prevents short circuits, ground faults, etc. between the DC motor control center 3 and the DC pump motor 4 from spreading to the DC bus 22.

Further, the central control room control panel 41 includes, for example, an operation switch 28 for operating the DC pump motor 4, a display indicating that the DC pump motor 4 is stopped, and a main contact 26 of the electromagnetic contactor in an open state. A green lamp 29 lights up when the DC pump motor 4 is activated, and a red lamp 3 lights up when the main contact 26 of the electromagnetic contactor is closed.
0, operation switches for various auxiliary equipment (not shown),
Indicator lights etc. are installed.

Furthermore, like the central control room control panel 41, the central control room external remote control stop control panel 42 is also provided with an operation switch 31, a green lamp 32, and a red lamp 33 for the DC pump motor 4, and these are used for mode switching. Contact 14 of switch 5
．． 15.1g, connected to 19.20.21.

And this contact point 14.15.18.19.20°21
is connected to a control center control circuit 27 in the DC motor control center 3 via a control multi-core cable 7.

In addition, the operation switch 28 in the central control room control panel 41
The information on opening/closing is input to the multiplex transmission device 43 as an electrical signal indicating the presence or absence of voltage, and within this multiplex transmission device 43, information indicating which auxiliary equipment (in this case, the operation switch is for the DC pump motor 4) and , and information indicating its open/closed status.Then, these codes are time-division multiplexed, converted to optical signals, and sent to the remote control stop control panel 42 outside the central control room via the optical fiber cable 45 of the transmission path. The multiplex transmission device 44 converts the multiplexed signal into an electrical signal, and also divides the multiplexed signal into individual codes, and each code contains information indicating which operating switch it is and whether it is open or closed. The output contact 4 in the multiplex transmission device 44 corresponding to the operation switch 28 is restored to the information representing the state.
6 to open and close. The output contact 46 and the contact 15 are connected in series, and the series circuit of the operating switch 31 and the contact 14 is connected in parallel. Furthermore, since the control center control circuit 27 is connected via the control multi-core cable 7, the operation of the DC pump motor 4 is controlled by opening and closing the output contact 46 or the operation switch 31.

In addition, the operating and stopping states of the DC pump motor 4 are input from the control center control circuit 27 to the multiplex transmission device 44 via the control multi-core cable 7, and are multiplex transmitted within the central control room control panel 41 by the reverse procedure to the above. The signal is input to the device 43, and a green lamp 29 or a red lamp 30 is turned on by opening or closing an output contact (not shown).

Next, the effect of the above configuration will be explained.

Normally, an operator is present in the central control room, and the mode selector switch S of the remote control stop panel 42 outside the central control room is turned to the "middle operation" side. Therefore, the operator must use the central control room control panel 41
The DC pump motor 4 is operated by the operation switch 28.
Performs stop control. At this time, contacts 15.18.2 of the mode changeover switch 5 of the remote control stop control panel 42 outside the central control room
0 is closed, and contacts 14, 19 and 21 are open.

In this state, the opening/closing information of the operating switch 28 is transmitted via the multiplex transmission device 43 to which operating switch of the DC pump motor (here, the operating switch 28 of the DC pump motor 4).
It is encoded into information specifying whether the device is open or closed, and information about its open/closed state, and is further transmitted as a time-division multiplexed optical signal to the multiplex transmission device 44 in the remote control stop control panel 42 outside the central control room via the optical fiber cable 47. transmitted to.

The multiplex transmission device 44 divides the optical multiplexed signal into individual codes, restores each code to information indicating that it is an operating switch 28 and information on its open/closed state, and transmits the signal to a predetermined operating switch 28 from a plurality of operating switches. Multiplex transmission equipment corresponding to [44
The output contacts 46 within the terminal are selectively opened and closed according to the commands.

The control I/roll center control circuit 27 is connected to this output contact 46.
The operation of the DC pump motor 4 is controlled by opening and closing.

Furthermore, the operating and stopping states of the DC pump motor 4 at this time are inputted from the control center control circuit 27 to the multiplex transmission device 44 via the control multi-core cable 7, and are sent to the central control room control panel 41 by the reverse procedure to the above. The green lamp 29 or the red lamp 30 is activated by the output signal of the multiplex transmission device 43.
is lit and displayed.

Note that when the mode changeover switch 5 is turned to the "middle layer" side as described above, the operation switch 31 and the green lamp 3 provided on the remote control stop control panel 42 outside the central control room are turned off.
2 and red lamp 33 are open contacts 14.19.21
Since the control center control circuit 27 is separated from the control center control circuit 27, the opening and closing of the operation switch 31 on the remote control stop control panel 42 outside the central control room has no relation to the operation of the pump motor 4, and the green lamp 32. Both red lamps 33 are turned off, and it can be confirmed that the control is currently being performed by the "central operation" side.

Next, when a situation arises in which the operator cannot access the central control room, the operator switches the mode changeover switch 5 provided on the remote control stop control panel 42 outside the central control room to the "RSS" side. As a result, contacts 14, 19, and 21 of mode changeover switch 5 are closed, and contacts 15.
18.20 is open circuit. As a result, the green pump 32 for operation display as well as the operation switch 31 of the DC pump motor 4 disposed on the remote control stop control panel 42 outside the central control room,
The red lamp 33 is connected to the DC motor control center 3, and instead the operation signal from the central control room control panel 41 is disconnected. The pump motor 4 can be operated and controlled in the same way as the operation in .

As mentioned above, the central control room control panel 41 and the central control room external remote operation stop control panel 42 are electrically separated, with optical signals being transmitted through the optical fiber cable 45, so that the operator cannot Even if a short circuit or ground fault occurs in the operation switch 28 or the multiplex transmission device 43 while the main control room control panel 1 cannot be accessed, the remote control stop control panel 42 outside the central control room may be There will be no negative impact.

In addition, if an incorrect signal is output due to a failure of the multiplex transmission device 43, the output contact 46 of the multiplex transmission device 44 of the remote control stop control panel 42 outside the central control room may open or close, but this is also the case with the mode changeover switch. 5 is open, and the DC motor control center 3 is not affected in any way.

In addition, conventionally, as shown in Fig. 2, the central control room control panel 4
Contacts 12 and 15 of the mode selector switch 5 are installed on the reciprocating path of the control multicore cable 7 to ensure that the electrical effects caused by short circuits, ground faults, etc. in the control cable 1 are not transmitted to the operation of the load. etc., so that even if welding or the like occurs at one of the contacts, it will not affect the operation at the remote control stop control panel 42 outside the central control room.

For this reason, an extremely large number of contacts were required for the mode selector switch 5, but in the present invention, since there is no need to consider electrical effects, switching by the mode selector switch 5 can also be performed with one contact per circuit. becomes possible,
The number of all-mode selector switches 5 can be reduced, the amount of operation by the operator is reduced, and reliability is improved without forgetting to switch.

Furthermore, with the above configuration, the fuses 24 and 25 in the DC motor control center 3 will not blow out due to short circuits, ground faults, etc. in the central control room control panel 41, so remote control stop control outside the central control room can be performed. There is no need to provide the DC power supply 34 in the panel 2, and therefore the control center control circuit 27 can be the same as the control center control circuit used when remote stop operation outside the central control room is not required, making it compatible. standardization was expanded.

〔Effect of the invention〕

As described above, according to the central control room external nuclear reactor shutdown device of the present invention, optical multiplex transmission is used for operation signal transmission between the central control room control panel and the central control room external remote operation shutdown control panel. The electrical effects caused by short circuits, ground faults, etc. at the The control panel has been made smaller, simplifying operations, eliminating omissions, and improving operational reliability.

In addition, since there is no need for DC or AC power supplies to power the control circuits of metal floods, power centers, control centers, etc. installed in the remote control shutdown control panel outside the central control room, it is possible to control the inside of nuclear power plants. The capacity of the power supply can be significantly reduced compared to the conventional one.

Furthermore, the control circuits in metal floods, power centers, and control centers, for example, are the same as the control circuits used in cases where remote control outside the central control room is not required, resulting in standardization and compatibility of these control circuits. This has the effect of improving maintainability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a nuclear reactor shutdown system outside a central control room according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional nuclear reactor shutdown system outside a central control room. 3...DC motor control center, 4...DC pump motor, 5...Mode selection switch. 7... Control multicore cable, 14, 15.1g, 19.20.21... Contact, 2
7... Control center control circuit, 28, 31...
・Operation switch. 41... Central control room control panel, 42... Remote control stop control panel outside the central control room, 43, 4
4...Multiple transmission device, 45...Optical fiber cable, 46...8 force contact.

Claims (1)

[Claims] The central control room control panel, which is located in the central control room and remotely controls the reactor, identifies and separates and optically multiplexes the contents of signals that indicate the status within the central control room control panel and signals from outside. A multiplex transmission device for transmitting and receiving data to and from the outside is provided, and a remote control stop control panel located outside the central control room for remotely shutting down the reactor is installed inside the central control room remote control stop control panel. This multiplex transmission device and the multiplex transmission device in the central control room control panel are equipped with a multiplex transmission device that identifies and separates and optically multiplexes the contents of a signal indicating the state of the device and the contents of a signal from the outside, and transmits and receives the same to the outside. A nuclear reactor shutdown device outside a central control room, characterized in that the two are connected by an optical fiber cable.