JPS5833518B2 - Remote shutdown device for nuclear power plants - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a nuclear power generation system that performs cold shutdown of a nuclear reactor by controlling auxiliary equipment of a nuclear reactor shutdown system using a remote shutdown operation panel installed outside the central control room in the event of an abnormality in the central control room. Regarding the remote stop device.

Generally, in a nuclear power plant, the control panel (
If the control system of the central control panel (hereinafter abbreviated as the central control panel) experiences a short circuit, ground fault, open circuit, etc., or if an emergency situation occurs that prevents operators from accessing the central control panel for some reason. The switch on the remote stop operation panel outside the central control room (hereinafter referred to as the R8S panel) installed in a location different from the central control room is connected to the R8 from the central control panel side.
By switching to the S panel side, the R3S panel can control auxiliary equipment such as pump drive motors and bring the reactor to cold shutdown.

In this case, even if the selector switch is switched to the R8S panel side, the control power that has been supplied to the auxiliary control circuit until then will not be cut off.
Care has been taken to supply control power from the S panel to the auxiliary equipment control circuit.

However, in conventional devices, a voltage relay is used to monitor the drive power of the auxiliary equipment and to detect whether the auxiliary equipment control circuit is functioning normally, supplying power to the auxiliary equipment control circuit. Two systems of power supply, that is, via a transformer in the control center that houses the auxiliary equipment control circuit - (
Since it is connected to the confluence of the drive power source introduced and the control power source from the R8S panel, when the changeover switch is switched to the R8S panel side, the voltage relay is energized by the control power source. It turns out.

Therefore, even if the switch circuit breaker that supplies drive power to the auxiliary equipment is open and the power supply to the auxiliary equipment is cut off, the voltage relay is energized, so the power supply is normal. It was determined that there was, and the alarm indicator on the R8S board did not display an alarm.

Therefore, for example, if the circuit breaker is manually opened due to a surveillance test on the central control panel, if the auxiliary equipment is controlled using the R8S panel, the auxiliary equipment may not operate. Regardless, the voltage relay is energized, so the alarm indicator on the R8S panel does not light up.

For this reason, there was a problem in that the operator mistakenly believed that the auxiliary equipment was being controlled normally, and it took time for the operator to realize that the auxiliary equipment was not operating.

Furthermore, in order to realize the above-mentioned fact and turn on the circuit breaker, it is necessary to go to the place where the circuit breaker is installed and operate it, resulting in the problem that it takes even more time to shut down the reactor. .

The present invention has been made in order to solve the above problems, and it is possible to reliably monitor the health of the auxiliary drive power source using the R8S panel, and also to remotely control the breaker closing switch installed on the R8S panel. An object of the present invention is to provide a remote shutdown device for a nuclear power plant that can turn on a switch breaker for supplying drive power to auxiliary equipment.

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

The figure is a circuit configuration diagram of a remote shutdown device for a nuclear power plant according to the present invention.

In the figure, 1 is the central control board, 2 is the R8S board, 3 is the control center, and 4 is the reactor shutdown system auxiliary equipment.

Power bus lines R and S installed in the control center 3,
T is the drive power supply (3-phase AC power supply) bus, and this bus R
, S, and T are connected to an auxiliary machine 4 outside the control center via a switching breaker MCB, an electromagnetic switch MS, and the like.

The switch MS is opened and closed by a switching controller, that is, an electromagnetic coil E in an auxiliary equipment control circuit 5 in the control center 3.

The auxiliary equipment control circuit 5 including the electromagnetic coil E supplies the driving power to the R8S panel 2, which is normally obtained via a unit auxiliary power transformer Ts whose primary side is connected to the intermediate point between the breaker MCB and the switch MS. The power is then supplied as control power.

The electromagnetic coil E is an operation switch swi on the central control panel 1.

It is energized at the appropriate time by closing the operation switch SW2 on the R8S board 2.

A1 to A8 and B1 to B8 on the R8S panel 2 are a group of interlocking type changeover switches, and when an operation is performed on the central control panel 1 side, the A1 to A8 sides are closed all at once, and the R8
When an operation is performed on the S panel 2 side, the B1 to B8 sides are closed all at once.

Among the changeover switches, BI B2 functions as a power switch that supplies AClooV single-phase AC power as a control power source to the auxiliary equipment control circuit 5 in the control center when performing operations using the R8S board.

Further, among the changeover switches, AI and A2 are used to disconnect the secondary side of the transformer Ts from the power supply path of the auxiliary control circuit 5 when the R8S board 2 is operated.

The voltage monitoring relay X1 connected to the secondary side of the transformer Ts in the control center 3 is connected to the changeover switch At,
The voltage monitoring relay X2 connected to the power input terminal of the auxiliary equipment control circuit 5 is for monitoring the drive voltage supplied to the auxiliary equipment 4 via the circuit breaker MCB even when A2 is open. , the voltage applied to either the power supply supplied via the transformer Ts or the AC 100V control power supply is constantly monitored.

x16 and x26 in the control center 3 are normally closed contacts of each of the voltage monitoring relays x1 and x2, and alarm indicators 6 and 7 installed in the central control panel 1 and R8S panel 2 depending on their open/close states. It provides a display signal to the

The switch SW3 in the R8S panel 2 is used to remotely close the breaker MCB according to the display content on the display 7. By closing this switch SW3, the breaker closing relay in the control center 3 is activated. It is designed to energize R.

The switch SW3 and the relay R constitute a breaker closing circuit according to the present invention.

In the above configuration, when the changeover switch provided on the R8S panel 2 is switched to the central control panel side and A1 to A8 are closed, power is supplied to the auxiliary equipment control circuit 5 from the unit auxiliary power transformer Ts through the closed switch. This is done via switch AI A2.

Therefore, the voltage control relay xi, x2 is energized,
Both contacts x1b and x2b are in an open state.

Therefore, no signal is sent to the alarm display 6 of the central control panel 1, indicating that the power supply is normal and the device is in a state in which it can operate normally.

Here, when the operation switch SW1 of the central control panel 1 is operated to close, the electromagnetic coil E is energized, so that the switch MS is closed.

Therefore, the driving power is supplied to the auxiliary machine 4, and the auxiliary machine 4 is activated.

As a result, a cold shutdown of the reactor is performed.

In addition, when the circuit breaker MCB is opened and the voltage monitoring relay x1. Since both x2 are deenergized, contact x1
b and x2b are both closed.

Therefore, an alarm is displayed on the alarm display 6.

Next, when the central control panel 1 is unusable due to a failure or the like, when the selector switch is switched to the R8S panel side and B1 to B8 are closed, the ACCloV of the R8S panel 2 is switched to the compensation switch via the closed selector switch BI B2. The signal is applied to the machine control circuit 5.

Therefore, the voltage supervisor TM'J tree 2 is activated.

On the other hand, the voltage monitoring relay X1 is supplied with power from the unit auxiliary power transformer Ts, so the changeover switch AI
, A2 are still in an energized state regardless of whether they are opened.

Therefore, as in the case described above, no signal is sent to the alarm indicator 7 of the R8S panel 2, indicating that the device is in a state in which it can operate normally.

Then, when the operation switch SW2 on the R8S board 2 is closed, the electromagnetic coil E is energized and the switch MS is closed, as in the case described above.

Therefore, the auxiliary equipment 4 is activated and the reactor is brought into cold shutdown.

By the way, if the circuit breaker MCB is manually opened and left unattended when performing the switching operation to the R8S panel side, B1 to B8 are closed by switching the changeover switch, and the control of ACIIO■ is sent to the auxiliary equipment control circuit 5. Power is applied.

Therefore, voltage monitoring relay X2 is energized.

On the other hand, since the breaker MCB is open, the voltage monitoring relay X1 is connected to the unit auxiliary power transformer T.
Since the input power to s is cut off, the applied voltage disappears and it is deenergized.

Therefore, when the contact x16 closes, a signal is sent to the alarm indicator 7 of the R8S panel 2 via the changeover switch B5, and the operator who displays the alarm knows that the above-mentioned circuit breaker 12 is in the open state. I can know.

Therefore, when the breaker closing switch SW3 provided on the R8S panel 1 is closed, the opening/closing breaker closing relay R
is energized, and the circuit breaker MCB is turned on.

As a result, the drive power for the auxiliary machine 4 is quickly restored.

Note that power is also supplied to the auxiliary power transformer Ts,
Voltage monitoring relay X1 is energized.

Therefore, the contact x1b opens and the signal to the alarm indicator 7 of the R3S board 2 is cut off, so that the alarm display is canceled.

Therefore, the operator can confirm that the device has returned to normal operating condition.

If the control power supply AC100V is cut off for some reason, the voltage monitoring relay X2 is deenergized.

In this case, regardless of the operating state of the other voltage monitoring relay X1, the alarm indicator 7 displays an alarm by closing the contact x2b.

Therefore, abnormalities in the power supply can be known.

Note that the present invention is not limited to the embodiments described above.

For example, in the above embodiment, the contacts x1b and x2b of the voltage monitoring relays x1 and x2 are connected in parallel, and the alarm indicator 6 or 7 is operated by the OR gate signal. Central control panel 1
, may be displayed individually on the display of the R8S board 2.

Of course, various modifications can be made without changing the gist of the invention.

As explained above, according to the present invention, since a voltage monitoring relay is provided that monitors the voltage of the drive power supply supplied to the auxiliary equipment via the breaker, regardless of the voltage applied to the auxiliary equipment control circuit, the changeover switch Even if the power supply is switched to the R8S panel side, it is possible to accurately detect whether or not the drive power supplied to the auxiliary equipment via the circuit breaker is normal, and this detection signal is sent to the alarm indicator on the R8S panel. , so you can accurately know if there is an abnormality in the drive power supply.

In addition, when the above alarm is displayed, closing the breaker closing switch provided on the R8S panel will activate the breaker closing relay, allowing you to remotely close the breaker and shutting down the auxiliary equipment. Drive power can be quickly restored.

Therefore, the health of the auxiliary drive power source can be reliably monitored on the R8S panel, and when necessary, the breaker can be remotely turned on using the breaker closing switch on the R8S panel, and the required stopping function can be achieved. We can provide a remote shutdown device for nuclear power plants.

[Brief explanation of the drawing]

The figure is a circuit configuration diagram of an embodiment of the present invention. 1... Central control panel, 2... Remote stop operation panel (R8S panel), 3... Control center, 4... Auxiliary equipment, 5... ...Auxiliary equipment control circuit,
6,7...Alarm indicator, MCB...Switch breaker, MS...Switch, E...
Electromagnetic coil (switching controller), xl, x2...
Voltage monitoring relay, SWI SW2... Operation switch, SW3... Breaker closing switch, R
...... Breaker closing relay, A1-A8, 81-
B8......Choice switch.

Claims (1)

[Scope of Claims] 1. A driving power source, a reactor shutdown system auxiliary equipment to which this driving power is supplied via a breaker and a switch, and a reactor shutdown system auxiliary equipment to which the driving power is supplied via the breaker and the switching device to which the driving power is supplied via the breaker and the switch. A central control panel equipped with an opening/closing controller for opening and closing the equipment, a switch for remotely operating the opening/closing controller, and an operation switch installed separately from the central control panel for remotely operating the opening/closing controller. a remote stop operation panel equipped with the remote stop operation panel; a changeover switch provided in the remote stop operation panel for switching a power supply path and a control path for the controller from the central control panel side to the remote stoppage side; a voltage monitoring relay that is separated from the power supply of the controller and monitors only the voltage of the drive power supplied to the auxiliary equipment via the breaker; The present invention is characterized by comprising a display that displays an alarm on a control panel or a remote stop operation panel, and a breaker closing circuit that performs a closing operation of the breaker from the remote operation stop panel in accordance with the display contents of the display. Remote shutdown device for nuclear power plants. 2. Claim 1, characterized in that the breaker closing circuit is configured such that when the closing switch of the remote stop operation panel is closed, the breaker closing relay is energized by the power supply for the control circuit. Remote shutdown device for the mentioned nuclear power plant.