JPH05333195A - Reactor remote shut down device - Google Patents

Abstract

PURPOSE:To provide a reactor remote shut down device capable of switching a control circuit after confirming the operation state of apparatuses when a switching means is switched. CONSTITUTION:A reactor remote shut down device, which performs the shutdown action of a reactor when a control panel 20 installed in a main control room to operate and monitor the apparatuses in a nuclear power plant can not be operated, has a switching means 35 switching the control circuit and the monitoring circuit of apparatuses between the control panel 20 and a shut down device main body 30. The switching means 35 is provided with switching position to set the control circuit to the control panel 20 side and the monitoring circuit to the shutdown device main body 30 side, and the control circuit and the monitoring circuit can be switched in steps.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote reactor shutdown device for shutting down a nuclear reactor from a place other than a central operating room in a nuclear power plant.

[0002]

During normal operation of a nuclear power plant, equipment in the power plant is operated and monitored in a central operating room. Then, the operator of the nuclear power plant monitors the state of valves and pumps deployed on site with the control panel installed in the central operation room, and uses the operation switches installed in the control panel as necessary. Open / close the above valves and start / stop the pump.

Although the central operation room can intensively monitor and operate the nuclear power plant, there is a risk that the nuclear power plant will become inoperable if the operation from the control panel becomes impossible due to a fire or the like. ing.

In particular, since the heat source of a nuclear power plant is a nuclear reactor, even after the nuclear reaction is stopped by scrum or the like,
The operation and monitoring of the equipment for a long time is required to remove the decay heat of the fuel. Therefore, in order to maintain the cold shutdown state after the scrum in the nuclear power plant, the remote reactor shutdown device (RSS) is installed so that the minimum operation and monitoring of the equipment can be performed from other than the central operation room. ..

This remote reactor shutdown device is installed in a place other than the central operation room, and by switching from the central operation room to the remote reactor shutdown device with a changeover switch provided in the remote reactor shutdown device, The device can be operated and monitored from the stop device. That is, the circuit is switched by the above-mentioned changeover switch so that the device can be controlled by the circuit from the control panel under normal conditions and the device can be controlled by the circuit from the reactor remote stop device under abnormal conditions.

FIG. 4 shows the contact development of a changeover switch 40 provided in the remote reactor stop device. The changeover switch 40 includes a control panel (central operation) in the central operation room and a remote reactor stop device (RSS). ), There are two switching positions, and the contact connection state at each position is as shown in the contact development 41. That is, at the position of the control panel (central operation), both the excitation circuit of the solenoid valve and the lamp display circuit are connected to the control panel side, and at the position of the RSS side, the contacts 1b, 2b, ... 6b.
They are connected to the remote reactor shutdown as shown in.

[0007]

However, as described above, the changeover switch 40 of the nuclear reactor remote stop device installed in the nuclear power plant is the excitation circuit (control circuit) of the solenoid valve and the lamp display circuit (monitoring circuit). To switch at the same time,
You cannot check the operating status of the equipment before switching. Therefore, even if the operation switch of the control panel and the operation switch of the reactor remote stop device are in different states, the changeover switch may be changed, and this changeover operation causes unnecessary start / stop of equipment. There is a defect.

The present invention has been made in consideration of the above-mentioned circumstances, and it is an object of the present invention to provide a remote reactor shutdown device capable of switching the control circuit after confirming the operating state of the equipment when switching the switching means. To aim.

[0009]

In order to solve the above-mentioned problems, a nuclear reactor remote stop system according to the present invention comprises a control panel installed in a central operation room for operating and monitoring equipment in a nuclear power plant. When the operation becomes impossible, in the reactor remote shutdown device for shutting down the reactor, it has a switching means for switching the control circuit and the monitoring circuit of the equipment between the control panel and the shutdown device body. The switching means is provided with a switching position where the control circuit is on the control panel side and the monitoring circuit is on the stop device body side, and the control circuit and the monitoring circuit can be switched stepwise.

[0010]

In the present invention having the above-mentioned structure, when the control panel installed in the central operation room is switched from the state of controlling / monitoring the equipment on site to the stop device main body, only the monitoring circuit is connected to the stop device main body side. Via the switch position. As a result, it is possible to confirm the difference between the state of the device and the operation switch of the main body of the stopping device, and prevent malfunction of the device when the switching means is switched to the main body of the stopping device.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a control / monitoring mechanism of a nuclear power plant to which an embodiment of a remote reactor shutdown device according to the present invention is applied. This control / monitoring mechanism is installed in a central operation room for operating / monitoring the valve mechanism 10 installed on site during normal operation of a nuclear power plant, and a control panel 20 installed in a place other than the central operation room and at least It is composed of a reactor remote stop device (RSS) 30 as a stop device main body for operating and monitoring the limited equipment. The control panel 20 is provided with an operation switch 21 of the valve mechanism 10. By operating this operation switch 21, the valve mechanism 10 is opened and closed, and by this opening and closing operation, the red lamp (R) 22a or the green lamp (G). ) 23a lights up. Further, the remote reactor stop device (RSS) 30 has an operation switch 31 like the control panel 20.
The valve mechanism 10 is opened / closed by operating the operation switch 31, and the red lamp (R) 32b or the green lamp (G) 33b is turned on by the opening / closing operation.

Further, a remote reactor shutdown device (RSS) 30
Has a changeover switch 35 as a changeover means, and this changeover switch 35 switches the opening / closing operation of the valve mechanism 10 to the reactor remote stop device 30 when the control panel 20 cannot be operated due to a fire or the like. Thus, the remote reactor stop device 30 operates and monitors the valve mechanism 10. That is, the valve mechanism 10 is controlled by the circuit from the control panel 20 at normal times, and the circuit is switched by the changeover switch 35 so that the valve mechanism 10 can be controlled by the circuit from the reactor remote stop device 30 at the time of abnormality. Next, the operation will be described.

The valve mechanism 10 installed at the site is normally opened and closed by the operation switch 21 attached to the control panel 20. At this time, the changeover switch 35 installed in the reactor remote stop device 30 is at the “middle operation” position of the control panel 20, and the opening / closing signal of the valve mechanism 10 from the operation switch 21 is transmitted via the changeover switch 35. The mechanism 10 is opened and closed. On the contrary, the open / closed state of the valve mechanism 10 is a red lamp 2 for indicating the state from the valve mechanism 10 via the changeover switch 35.
2a, transmitted to the green lamp 23a.

Next, when the control panel 8 becomes unusable due to a fire or the like, the changeover switch 35 is first switched from the "middle operation" position to the "display" position. In this state, the opening / closing signal of the valve mechanism 10 remains the operation switch 21, but the signal of the opening / closing state of the valve mechanism 10 passes from the valve mechanism 10 through the changeover switch 35 and then the reactor remote stop device 30.
The status is switched to the red lamp 32b and the green lamp 33b, and the equipment status can be monitored on the side of the remote reactor shutdown device 30.

Then, the operator of the nuclear power plant "displays"
At the position, the operation switch 31 of the remote reactor stop device 30 is compared with the red lamp 32b and the green lamp 33b, and after confirming that there is no difference between the operation switch 31 and the equipment state, the changeover switch 35 is moved from the "display" position. Reactor remote shutdown device 3
Switch to the "RSS" side, which is the 0 side. Due to this switching, the opening / closing signal of the valve mechanism 10 is also applied to the remote reactor stop device 30.
To the operation switch 31 side, and both the control circuit and the monitoring circuit are switched to the reactor remote stop device 30 side.

That is, FIG. 2 shows a specific circuit configuration of FIG. As described above, the circuit from the control panel 20 and the circuit from the reactor remote stop device 30 are connected to the valve mechanism 10 installed at the site via the changeover switch 35. The valve mechanism 10 includes a solenoid valve 11 for operating the valve, a fully open contact 12 and a fully closed contact 13 for detecting the state of the valve. The solenoid valve 11 operates by receiving the switching signal of the operation switch 21 or the operation switch 31, and the signal from the fully open contact 12 is transmitted to the red lamp 22a or 32b, and the signal from the fully closed contact 13 is transmitted to the green lamp 23a or 33b, respectively. To be done. Here, the control circuit is an exciting circuit of the solenoid valve 11, and the monitoring circuit is a lamp display circuit.

FIG. 3 shows the connection state of the contacts for performing the switching operation in the changeover switch 35, and shows that the contacts are turned on within the range indicated by the black circles and horizontal bars of the contact development 35a. At the "middle operation" position of the control panel 20 of the changeover switch 35, the contacts 1 and 1a, the contacts 2 and 2a, the contacts 3 and 3a, the contacts 4 and 4a, the contacts 5 and 5a, and the contacts 6 and 6a are turned on in FIG. Next, operation switch 21, red lamp 2
2a, green lamp 23a is connected to the valve mechanism 10 at the site,
Both the control circuit and the monitoring circuit are on the control panel 20 side.

Next, in the "display" position of the changeover switch 35, the contacts 1 and 1a, the contacts 2 and 2a, the contacts 3 and 3b, and the contact 4 are provided.
And 4b, contacts 5 and 5b, and contacts 6 and 6b are turned on, and the operation switch remains the operation switch 21 of the control panel 20, but the red lamp is switched to 32b and the green lamp is switched to 33b. Is the control panel 20, and only the monitoring circuit is on the side of the reactor remote stop device 30.

Finally, when the changeover switch 35 is in the "RSS" position, the contacts 1 and 1b, the contacts 2 and 2b, the contacts 3 and 3b,
The contacts 4 and 4b, the contacts 5 and 5b, and the contacts 6 and 6b are turned on, the operation switch 31 is switched to, the red lamp 32b and the green lamp 33b are connected to the valve mechanism 10 on the site, and both the control circuit and the monitoring circuit are connected. It is on the side of the reactor remote stop device 30.

As described above, in the present embodiment, the changeover switch 35 is used for the control circuit and the monitoring circuit of the device such as the valve mechanism 10.
Is switched between the control panel 20 and the stop device main body 30 by means of the changeover switch 35.
A switching position is provided on the side where the monitoring circuit is on the side of the remote reactor stop device 30 so that the control circuit and the monitoring circuit can be switched in stages.

[0022]

As described above, according to the reactor remote shutdown device of the present invention, when switching from the control panel to the shutdown device body, first, only the equipment state monitoring circuit is switched, and then the control is performed. Since the circuits can be switched, the state of the device and the state of the operation switch can be matched before switching the control circuit, and unnecessary operation of the device can be prevented when the switching means is switched to the main body of the stop device. It will be possible. Thereby, the reliability of the remote reactor shutdown device can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a control / monitoring mechanism of a nuclear power plant to which an embodiment of a remote reactor shutdown device according to the present invention is applied.

FIG. 2 is a circuit diagram showing a specific configuration of FIG.

FIG. 3 is a contact development view of the changeover switch of FIG.

FIG. 4 is a contact development view of a conventional changeover switch.

[Explanation of symbols]

 1 to 6 contacts 1a to 6a contacts 1b to 6b contacts 10 valve mechanism 11 solenoid valve 20 control panel 21 operation switch 22a red lamp 23a green lamp 30 reactor remote stop device 31 operation switch 32b red lamp 33b green lamp 35 changeover switch (changeover) means)

Claims (1)

[Claims] 1. A nuclear reactor remote shutdown device for shutting down a reactor when operation of a control panel installed in a central operation room for operating and monitoring the equipment in a nuclear power plant becomes impossible, Has a switching means for switching between the control circuit and the monitoring circuit between the control panel and the main body of the stopping device, and the switching means has a switching position where the control circuit is on the control panel side and the monitoring circuit is on the main body side of the stopping device. Is provided, and the control circuit and the monitoring circuit can be switched in stages.