JPH0350240B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation guide device for providing operation guidance to a system to be manually activated after a nuclear reactor accident occurs in a nuclear power plant.

In general, boiling water nuclear power plants are configured so that when a reactor accident occurs, the emergency core cooling system (ECCS) is automatically activated in response to the accident signal to prevent the accident from spreading. and above
After the reactor core is submerged to some extent due to the operation of the ECCS system, for systems that need to be restarted or for certain operating modes, operators will be required to review the details of the accident, the response status after the accident, The system is designed to be activated manually after fully understanding the status of the reactor and reactor containment vessel after an accident and making an accurate judgment of the situation. Examples of systems and modes that need to be activated by manual operation include the flammable gas concentration control system (FCS), main steam leakage suppression system (MSIV-LCS), and reactor residual heat removal system (RHR system). Containment vessel spray mode, etc.

By the way, when performing such a manual startup, conventionally there was no special device to inform the operator of the startup timing and guide the operation, and to some extent it was necessary to use process signals that could determine the core state etc. There was simply an interlock. Moreover, immediately after an accident, it is necessary to understand the main process quantities such as the reactor water level, reactor pressure, pressure inside the reactor containment vessel, atmospheric temperature inside the containment vessel, and suppression pool water temperature, and to check the startup of the ECCS system. Operators have an extremely large number of monitoring and inspection items. For this reason, we are busy carrying out each of the above tasks,
There is a risk that it may not be possible to confirm the progress after the accident, or that it may not be possible to perform the containment vessel spray mode, FCS, and MSIV-LCS manual activation at the appropriate time, which should be done immediately after ensuring the integrity of the reactor core. It was hot.

The present invention has been made in consideration of such circumstances, and its purpose is to provide an operation guide device that can inform operators of the details of operation operations after a nuclear reactor accident occurs.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of the apparatus of the present invention, and numerals 1 to 4 in the figure are reactor accident signal introduction sections. That is, 1 is a reactor water level low signal introduction part, and 2 is a reactor containment vessel internal pressure high signal introduction part. Further, numerals 3 and 4 are a reactor water level low signal introduction section and a containment vessel pressure high signal introduction section of different sections, which constitute the redundant systems 1 and 2, respectively. Reference numeral 5 denotes a test signal introducing section for introducing a simulated test signal used in surveillance tests of this device from a bench board of a nuclear power plant or the like.

The signals introduced by each of the signal introducing sections 1 to 4 and 5 are input to the driving guide control section 10. A process signal indicating the reactor operating state introduced by the process signal introduction section 6 is also input to the operation guide control section 10 . In addition, the driving guide control section 10
A display signal is outputted to the driving guide display 8 of the monitoring panel 7.

The driving guide control section 10 includes the signal introducing section 1,
Signal determination circuit 11 that inputs the reactor water level signal and reactor containment vessel pressure signal from 2, 3, and 4 to determine whether an accident has occurred in the reactor.
, a time counter 12 that starts timing based on the output signal of this signal determination circuit 11, and this counter 1.
a time elapsed display 13 that displays the passage of time after the accident based on a time signal from the time counter 12; a time signal output from the time counter 12 at predetermined intervals; and a process signal input from the process signal introducing section 6; A logic circuit 14 that makes a logical judgment as to whether or not the conditions (time, system type, etc.) for manually performing a start operation according to the above are satisfied, and sends out a start command signal when the conditions are met; and this logic circuit. 14
The output circuit 15 forms a predetermined driving operation guide signal in response to a start command signal sent from the driving guide display 8 and supplies the signal to the driving guide display 8.

FIG. 2 is a diagram showing a specific example of the logic circuit 14 in relation to the time counter 12, the process signal introducing section 6, and the like. In FIG. 2, 21 and 22 are AND circuits, and 23 and 24 are OR circuits. The AND circuit 21 outputs a signal XA indicating that the RHR pump is "in operation" which is introduced by the process signal introduction section 6 and sent out from the terminal 6A, and which is output from the output terminal 12A of the time counter 12 when 10 minutes have passed since the accident. This is to obtain an output that matches the signal YA. The OR circuit 23 receives a signal XB indicating the reactor water level "0 or more" which is introduced by the process signal introduction section 6 and sent out from the terminal 6B, and a signal XB which is also introduced by the process signal introduction section 6 and sent out from the terminal 6C. Signal XC indicating the containment vessel pressure “at most”
This is to obtain the OR output. Further, the AND circuit 22 obtains a coincidence output between the coincidence output signal of the AND circuit 21 and the OR output signal of the OR circuit 23, and supplies this to the output circuit 15 as a start command signal S1. The OR circuit 24 is connected to the signal YB output from the output terminal 12B of the time counter 12 when 30 minutes have elapsed after the accident, and the hydrogen concentration in the containment vessel introduced by the process signal introduction section 6 and sent from the terminal 6D. High signal
Obtain the OR output with XD and use this as the activation command signal S2
It is given to the output circuit 15 as a signal.

Next, the operation of the apparatus configured as described above will be explained. When a low water level signal and a high PCV pressure signal indicating that the reactor is in an accident are input to the signal introduction units 1, 2 and 3, 4, the operation guide control unit 1
At 0, the signals from each signal introducing section 1, 2 and 3, 4 are input to the signal determination circuit 11, and it is determined that the reactor is in an accident. Then, the signal determination circuit 11
A count start signal is sent to the time counter 12 from. Then, the time counter 12 starts counting the elapsed time after the accident with the time of signal input as time "0". The signal ST indicating the elapsed time counted by the time counter 12 is input to the time elapse display 13 installed in the driving guide control unit 10 on the one hand, and is input to the driving guide installed on the monitoring panel 7 on the other hand. Input on display 8.
Therefore, the elapsed time after the accident is the time elapsed indicator 1.
For example, it is displayed digitally on the driving guide display 8, and is also displayed in analog form, for example, as a bar-like index on the time axis of the driving guide display 8. In this way, the elapsed time after the accident can be clearly indicated to the operator, and a guideline for performing necessary operations can be provided.

On the other hand, the time counter 12 sends out a time signal (contact output) at every predetermined time. That is,
10 minutes after the accident, a signal is output from terminal 12A.
YA is output and applied to one input terminal of the AND circuit 21 of the logic circuit 14. At this time, if a signal XA indicating that the RHR pump is "in operation" is being sent from the terminal 6A of the process signal introducing section 6, this signal is applied to the other input terminal of the AND circuit 21. Therefore, in this case, the AND circuit 21 obtains a coincidence output, which is applied to one input terminal of the other AND circuit 22. On the other hand, a signal XB of the reactor water level "0 or more" indicating water level recovery after the accident is sent from the terminal 6B of the process signal introducing section 6, or a signal of "at most" of the containment vessel internal pressure is sent from the process signal introducing section 6. The OR output of these signals is applied to the other input terminal of the AND circuit 22 via the OR circuit 23. AND circuit 2
Assuming that the coincidence output from the AND circuit 21 has already been applied to one input terminal of the AND circuit 22, the coincidence output is sent from the AND circuit 22. This coincidence output signal becomes the containment vessel spray activation command signal S1 and is input to the output circuit 15. Therefore, the output circuit 15 outputs a driving operation guide signal according to the command signal S1, which is sent to the monitoring panel 7.
Enter into the driving guide display 8 above. the result,
A message commanding activation of the containment vessel spray is displayed on the driving guide display 8, for example, in relation to an elapsed time indicator on the time axis. Thus, 10 minutes after the accident, if the RHR pump is in operation and the reactor water level is above the 0 level, or if the pressure inside the containment vessel is at maximum, the containment of the RHR system is A container spray mode activation command will be automatically displayed on the operation guide display 8.

When 30 minutes have passed after the accident, the signal YB is output from the terminal 12B of the time counter 12. this signal
YB passes through the OR circuit 24 of the logic circuit 14, and the FCS
The signal is input to the output circuit 15 as a system startup command signal S2. Also, even before 30 minutes have passed after the accident,
When the containment vessel hydrogen concentration "high" signal XD is introduced by the process signal introducing section 6 and sent out from the terminal 6D, this signal XD passes through the OR circuit 24,
It is input to the output circuit 15 as the FCS system start command signal S2 similar to the above. When the command signal S2 is input to the output circuit 15, a display signal corresponding to the command signal S2 is output from the output circuit 15, and this is input to the driving guide display 8 on the monitoring panel. As a result, the message instructing the startup of the FCS system is
For example, it is displayed on the driving guide display 8 in relation to an elapsed time indicator on the time axis. Thus, when 30 minutes have passed since the accident, or when the hydrogen concentration in the containment vessel becomes "high," an FCS system activation command is automatically displayed on the operation guide display 8. Become.

In this way, in this device, when an accident occurs in a nuclear reactor, the details of the operation operations to be performed after the accident occurrence are displayed on the display 8 along with the elapsed time since the accident occurrence, so that the operation operations after the accident occurrence are displayed on the display 8. The contents can be informed to the operator, and erroneous operation and erroneous judgment by the operator who is preoccupied with other work can be prevented.

Note that the present invention is not limited to the above-mentioned embodiment. For example, in the embodiment described above, the RHR system containment vessel spray mode activation request command and the FCS activation command were cited as examples of manual activation commands, and a case was shown in which the logic circuit 14 was logically configured to correspond to the above two commands. By incorporating the necessary logic configuration for the MSIV-LCS activation command and other activation commands into the logic circuit 14, these commands can be displayed together with the elapsed time after the accident, as in the above two examples. Further, in the above embodiment, the time related to the timing of the containment vessel spray mode activation command is set to 10 minutes after the accident, the time related to the timing of the FCS activation request command is determined to be 30 minutes after the accident, and the terminal 12A of the timing counter 12, The example above shows the case where signals YA and YB are sent out 10 minutes and 30 minutes after 12B, but the above times are determined based on safety analysis, so they may be changed depending on the implementation situation. In this case, the time counter 12 itself may be configured to have variable output time.
Further, in the above embodiment, a display is used as a means for notifying the operator of a start command, etc., but a sound or other notification means may be used alone or in combination with the display or the like.

As explained above, according to the present invention, when an accident occurs in a nuclear reactor, the details of the operation that should be performed after the accident occurs are displayed on the display means together with the elapsed time after the accident occurs. It is possible to provide a driving guide device that can inform an operator of driving operation details.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing a specific example of a logic circuit of the embodiment in relation to its peripheral parts. 10...Driving guide control unit, 11...Signal determination circuit, 12...Time counter, 13...Time progress indicator, 14...Logic circuit, 15...Output circuit,
21, 22...AND circuit, 23, 24...OR circuit.

Claims (1)

[Claims] 1 A reactor water level signal introduction section that introduces a water level signal inside the reactor, a reactor containment vessel pressure signal introduction section that introduces a pressure signal inside the reactor containment vessel, and input signals from these signal introduction sections. a signal determining means for determining whether or not an accident has occurred in the nuclear reactor; and a timing counter that is activated by a signal from the signal determining means when an accident occurs in the nuclear reactor and sends out a signal at predetermined time intervals. , a process signal introducing section that introduces a process signal of the reactor, and a start command signal when the signal from the process signal introducing section and the signal from the time counter satisfy the conditions for performing a start-up operation after the occurrence of a nuclear reactor accident. an operation guide signal output means for outputting a nuclear reactor operation guide signal based on the signal from the logic means, and an operation guide signal output means for outputting a nuclear reactor operation guide signal based on the signal from the logic means, 1. A driving guide device comprising: display means for displaying the details of the driving operation in the nuclear reactor together with the elapsed time since the occurrence of the nuclear reactor accident.