JP6264694B2 - Nuclear plant control system dismantling method, nuclear plant control system - Google Patents

Description

  The present invention relates to a method for dismantling a nuclear power plant control system and a nuclear power plant control system.

  Nuclear power plants need to be dismantled when problems such as aging occur. A technique related to a computer system configuration of a nuclear power plant is disclosed in Patent Document 1.

JP 2012-233705 A

  In the dismantling of the whole nuclear power plant as described above, it is necessary to perform the dismantling work while maintaining and managing the cooling of the decay heat (heat generation) of the nuclear fuel. The power supply for the maintenance and sensing signal acquisition of each predetermined sensor are also required during the dismantling operation. In the dismantling process of a large-scale nuclear plant, it is required to efficiently dismantle while reducing the power demand as much as possible and maintaining the acquisition of necessary sensing signals.

  Accordingly, an object of the present invention is to provide a nuclear plant control system disassembly method and a nuclear plant control system that can solve the above-described problems.

  In order to achieve the above-mentioned object, the present invention provides an ordinary system control device that performs a control process of a normal operation control of a nuclear power plant, a safety system control device that performs a control process of a safe operation control at the time of abnormality of the nuclear power plant, A dismantling method for a nuclear power plant control system, comprising: a central control device that performs at least input interface processing between the regular system control device and the safety system control device and recording processing of the control processing, wherein the regular system control device Among the sensor signals input to the safety system control device, the sensor signal necessary for the decommissioning measures of the nuclear power plant is input, the control processing of the normal system control device, and the control processing of the safety system control device And a dedicated control device for decommissioning measures that performs processing of the central control device in a central control room in which the central control device is disposed And purifying or adjusting the temperature of the space in which the normal system control device and the safety system control device are disposed, and the space related to the regular system control device and the safety system control device is disposed. A dismantling method for a nuclear power plant control system, including an unnecessary facility handling step of stopping or removing unnecessary facilities installed in the space including the air conditioning facility.

  Further, the present invention provides a normal system control device that performs a control process of a normal operation control of a nuclear power plant, a safety system control device that performs a control process of a safe operation control when the nuclear power plant is abnormal, the normal system control device, and the A nuclear power plant control system dismantling method comprising: a central control device that performs at least an input interface process with a safety system control device and a recording process of the control process, wherein the regular system control device, the safety system control device, The sensor signals necessary for decommissioning measures of the nuclear power plant are input, the control processing of the regular system control device, the control processing of the safety system control device, and the central control device A dedicated control device for decommissioning measures that performs processing, a space in which the central control device is disposed, an empty space in which the regular system control device and the safety system control device are disposed. Decommissioning measures dedicated control device placement step to be placed in an external space other than the above, a space in which the regular system control device and the safety system control device are disposed in the regular system control device and the safety system control device A dismantling method for a nuclear power plant control system comprising: an unnecessary equipment handling step of stopping or removing unnecessary equipment installed in the space provided with an air conditioning equipment for purifying or adjusting the temperature of a space in which related devices are arranged.

  Further, the present invention provides a method for disassembling a nuclear power plant control system, wherein the dedicated control device for decommissioning measures inputs one or more of the plurality of sensor signals and converts them into digital signals. A card mounting mechanism for detachably mounting a plurality of circuit mounting cards, and using the digital signal output from the conversion circuit mounting card mounted on the card mounting mechanism, the control processing of the regular system control device, A control processing unit that performs control processing of a safety system control device and processing with the central control device, and converts a sensor signal input from a sensor disposed in a dismantled space into the digital signal Removing the conversion circuit mounted card from the card mounting mechanism.

  Further, according to the present invention, in the dismantling method of the nuclear power plant control system described above, the control processing unit of the decommissioning measures dedicated control device is provided corresponding to one or a plurality of the conversion circuit mounted cards. A control unit for exclusive use of the decommissioning measure, and a power shut-off step for shutting off the power of the control processing unit provided corresponding to the removed conversion circuit mounted card.

  Further, the present invention provides a normal system control device that performs a control process of a normal operation control of a nuclear power plant, a safety system control device that performs a control process of a safe operation control when the nuclear power plant is abnormal, the normal system control device, and the A nuclear power plant control system comprising: a central control device that at least performs input interface processing with a safety system control device and recording processing of the control processing, and is input to the normal system control device and the safety system control device Sensor signals necessary for decommissioning measures of the nuclear power plant are input, control processing of the regular system control device, control processing of the safety system control device, and processing of the central control device, It is a nuclear power plant control system provided with a dedicated control device for decommissioning measures.

  According to the present invention, in the above-described nuclear power plant control system, the dedicated control device for decommissioning measures includes a monitoring operation device and a recording device.

  Further, the present invention provides the above-described nuclear power plant control system, wherein the dedicated control device for decommissioning measures includes a central control room in which the central control device is disposed, or the regular system control device and the safety system control device. Placed in the control panel room.

  Further, the present invention provides the above-described nuclear power plant control system, wherein the dedicated control device for decommissioning measures inputs one or a plurality of sensor signals among the plurality of sensor signals and converts them into digital signals. A card mounting mechanism in which a plurality of cards can be inserted and removed, and a digital signal output from the conversion circuit mounted card mounted in the card mounting mechanism, the control processing of the regular system control device, and the safety system control And a control processing unit that performs processing with the central control device.

  Further, the present invention is the above-described nuclear power plant control system, wherein the control processing unit includes the dedicated control device for decommissioning measures provided corresponding to one or a plurality of the conversion circuit mounted cards.

  Further, the present invention is the above-described nuclear power plant control system, wherein the dedicated control device for decommissioning measures is a power source for a plurality of the control processing units provided corresponding to one or a plurality of the conversion circuit mounted cards. Are provided with a power shutoff circuit for shutting off each of them separately.

  ADVANTAGE OF THE INVENTION According to this invention, the dismantling operation | work can be performed efficiently, reducing the power demand, the installation space of various control facilities, and the air-conditioning equipment accompanying the said control facility, and maintaining acquisition of a required sensing signal.

It is a figure which shows the nuclear power plant control system by one Embodiment of this invention. It is a 1st figure which shows the outline | summary of the connection process of the cable to the control apparatus only for decommissioning measures by one Embodiment of this invention. It is a 2nd figure which shows the outline | summary of the connection process of the cable to the control apparatus only for decommissioning measures by one Embodiment of this invention.

(First embodiment)
Hereinafter, a nuclear plant control system and a nuclear plant control system disassembly method according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a nuclear plant control system according to a first embodiment of the present invention.
In this figure, the code | symbol 100 has shown the plant building. A central control room 10 is arranged in the plant building 100. A central control device (central control panel) 11 is disposed in the central control room 10. In the plant building 100, an ordinary system control device (ordinary system control panel) 12 and a safety system control device (safety system control panel) 13 are arranged in a space different from the central control room 10.

The central control device 11 is a computer device that at least performs input interface processing between the normal system control device 12 and the safety system control device 13, and recording processing of control processing results in the central control device 11, the normal system control device 12, and the like.
The regular system control device 12 is a computer device that performs control processing for regular operation control of a nuclear power plant.
The safety system control device 13 is a computer device that performs a control process of safe operation control when the nuclear power plant is abnormal.
The central control device 11 is connected to the regular system control device 12 and the safety system control device 13 via a communication network.

The regular system control device 12 is connected to a controlled object such as regular instruments, accessories, valves, etc. by a cable or the like. The normal system control device 12 acquires a signal from a normal system instrument by a signal transmitted via a cable or the like, and controls controlled objects such as auxiliary machines and valves. In FIG. 1, reference numerals 14 denote common-use instruments and controlled objects.
The safety system control device 13 is connected to a controlled object such as safety-related instruments, auxiliary machines, and valves by a cable or the like. The safety system control device 13 acquires signals from safety-related instruments using signals transmitted via cables and the like, and controls controlled objects such as auxiliary machines and valves. In FIG. 1, reference numerals 15 denote safety-related instruments and controlled objects.

  The nuclear power plant control system in the present embodiment newly includes a decommissioning measure dedicated control device 16 and a decommissioning measure monitoring operation device 17 in addition to the central control device 11, the regular system control device 12, and the safety system control device 13. In the present embodiment, the decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 are illustrated and described as different devices, but may be the same device. The decommissioning measure dedicated control device 16 includes a cable relay device 18 connecting the normal system control device 12 to the normal system instruments and the control target 14, a safety system control device 13, the safety system instruments, and the control target 15. Are connected via a separate cable to each of the cable relay devices 19 connecting the two. The cables connecting the decommissioning measures dedicated control device 16 and the relay devices 18 and 19 are necessary for the decommissioning measures of the nuclear power plant among the sensor signals input to the normal system control device 12 and the safety system control device 13, respectively. Are connected via cables and relay devices 18 and 19 for transmitting various sensor signals (ordinary meters, cables to be connected to the control object 14, safety instruments, and the control object 15).

  The decommissioning measure dedicated control device 16 inputs sensor signals necessary for the decommissioning measures of the nuclear power plant among the sensor signals input to the normal system control device 12 and the safety system control device 13, and performs normal system control. Processing equivalent to the control processing of the device 12, processing equivalent to the control processing of the safety control device 13, and processing equivalent to the processing of the central control device 11 are performed.

  The dedicated decommissioning measure control device 16 is connected to the decommissioning measure monitoring operation device 17 via a cable. The decommissioning measure monitoring operation device 17 includes a monitor (display device) and an input device. In the decommissioning measure, the operator controls the input device based on the information displayed on the monitor of the decommissioning measure monitoring operation device 17 to control the regular instrument, the control object 14 and the safety instrument in the decommissioning measure. Monitoring of information from the control object 15 and control of these control objects are performed. The operator can use the monitor provided in the decommissioning measure monitoring operation device 17 with information equivalent to the operations that can be performed by the central control device 11, the regular system control device 12, and the safety system control device 13, or information specialized for decommissioning measures. Can be monitored. Further, the operator uses the input device provided in the decommissioning measure monitoring operation device 17 to perform control operations equivalent to the control operations that can be performed by the central control device 11, the regular system control device 12, and the safety system control device 13. Or control operation specialized in decommissioning measures can be performed. Further, the decommissioning measure dedicated control device 16 has the same recording process (function of the recording device) as the central control device 11.

  The decommissioning measure dedicated control device 16 may be connected to the wireless display terminal 110 via wireless communication. The wireless display terminal 110 is a small computer device that can be carried by an operator. The decommissioning measure dedicated control device 16 transmits the input sensor signal to the wireless display terminal 110 or transmits information calculated based on the sensor signal to the wireless display terminal 110. The wireless display terminal 110 performs arithmetic processing using the received signal and information and displays the information. In addition, the wireless display terminal 110 may have a function that allows a function equivalent to the function of the input device included in the decommissioning measure monitoring operation device 17 to be operated on the screen. As a result, the operator can carry the wireless display terminal 110 away from the decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 to perform monitoring and operation in the decommissioning measure.

Note that the decommissioning measure dedicated control device 16 may be connected to a data center outside the nuclear power plant or each computer device owned by a country, a prefecture, or the like.
The decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 may be newly arranged in the process of the decommissioning measure in the same space as the central control room 10 in which the central control device 11 is arranged. It may be newly arranged outside the control room 10 in the course of the decommissioning measure (such as another space in the plant building 100).

Next, a dedicated decommissioning measure control device arrangement process and an unnecessary facility handling process in the nuclear power plant control system described above will be described.
In dismantling the nuclear plant control system, as described above, the decommissioning measure control device 16 and the decommissioning measure monitoring operation device 17 are newly arranged in the nuclear plant control system. Implement (step S1). The place to be arranged as described above may be inside the central control room 10 or outside the central control room 10. According to the arrangement process of the dedicated control device for decommissioning measures, the functions of the normal system control device 12, the safety system control device 13, and the central control device 11 are integrated and the space for holding those functions is made compact. Can do.
When the decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 are arranged in the central control room 10, a space (central control room) in which the normal system control device 12 and the safety system control device 13 are arranged. The unnecessary equipment handling process for stopping or removing unnecessary equipment installed in a space different from 10 is prioritized over the unnecessary equipment handling process for stopping or removing unnecessary equipment installed in the space where the central control room 10 is located. (Step S2a). Since the sensor signal necessary for dismantling the nuclear power plant control system can be received by the decommissioning measure dedicated control device 16, it is preferentially placed in the space where the normal system control device 12 and the safety system control device 13 are arranged. The installed unnecessary equipment can be stopped or removed.

  In the space where the regular system control device 12 and the safety system control device 13 are arranged, the space where the regular system control device 12, the safety system control device 13, and devices related to these control devices are arranged is purified. Or the air-conditioning equipment 1a which adjusts temperature is arrange | positioned. By stopping or removing unnecessary equipment installed in the space where the regular system control device 12 and the safety system control device 13 are arranged, the regular system control device 12, the safety system control device 13, and the control devices are provided. The air conditioning equipment 1a that purifies or adjusts the temperature of the space in which the related apparatus is arranged can be stopped or removed together. Since this air conditioning facility 1a is arranged for the purpose of removing a large amount of heat and gas emitted from the service control device 12, the safety control device 13, and the devices related to these control devices, it is large in size and consumes electricity. It is a large amount of air conditioning equipment. According to the above process, necessary monitoring and control can be performed by receiving necessary sensor signals even in the dismantling of the nuclear power plant and the nuclear power plant control system, and the normal system control device 12, the safety system control device 13, and the Along with stopping or removing unnecessary equipment installed in a space where devices related to the control device are arranged, it is possible to greatly reduce the amount of electricity consumed.

  The decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 are arranged in the central control room 10 in which the central control device 11 is arranged, the regular system control device 12 and the safety system control device 13. When arranged outside the space, it is necessary to stop or remove unnecessary facilities installed in the space of the central control room 10 and the space where the regular system control device 12 and the safety system control device 13 are disposed. A process is performed (step S2b). Since the sensor signal necessary for the dismantling of the nuclear power plant and the nuclear power plant control system can be received by the decommissioning measure dedicated control device 16, the arrangement of the central control room 10, the regular system control device 12, and the safety system control device 13 is arranged. It is possible to stop or remove unnecessary equipment installed in the space.

In the central control room 10, a large air-conditioning facility 1b is arranged in the same manner as the space in which the regular system control device 12 and the safety system control device 13 are arranged. Even if the unnecessary equipment installed in the central control room 10 or the space where the normal system control device 12 and the safety system control device 13 are disposed is stopped or removed, the decommissioning measure dedicated control device 16 or the decommissioning measure monitoring operation is performed. While monitoring and controlling by the device 17, the central control device 11, the regular system control device 12, the safety system control device 13, the air conditioning equipment 1 a and 1 b arranged for these control devices, etc., or the equipment accompanying them Unnecessary equipment can be stopped or removed.
By such unnecessary equipment handling process, necessary monitoring and control can be performed by receiving necessary sensor signals even in the dismantling of the nuclear power plant and the nuclear power plant control system, and the space of the central control room 10 and the normal system control can be performed. Along with stopping or removing unnecessary equipment installed in the space where the device 12, the safety system control device 13 and the devices related to these control devices are arranged, the electricity consumption which became unnecessary during the decommissioning measures is greatly increased. Can be reduced.
Note that the decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 are arranged in the control panel room in which the regular system control device 12 and the safety system control device 13 are arranged, and the control panel. Unnecessary equipment installed in a space other than the room may be stopped or removed first.

(Second Embodiment)
FIG. 2 is a first diagram showing an outline of a process of connecting a cable to a dedicated control device for decommissioning measures.
As shown in FIG. 2, the decommissioning measures dedicated control device 16 includes a CPU (Central Processing Unit) 161, a ROM (Read Only Memory) 162, a RAM (Random Access Memory) 163, an HDD (Hard Disk Drive) 164, and a conversion circuit mounted card. 165, 166, 167, 168.

Each of the conversion circuit mounted cards 165, 166, 167, and 168 includes a card-like circuit board on which a conversion circuit for converting an analog signal into a digital signal or converting a digital signal into an analog signal is mounted. The decommissioning measure dedicated control device 16 includes a card mounting mechanism that mounts one or more of the conversion circuit mounting cards 165, 166, 167, and 168 in a removable manner. The mechanism may have any structure as long as the conversion circuit mounted cards 165, 166, 167, 168 can be inserted into and removed from the decommissioning measure dedicated control device 16. In other words, any mechanism can be used as long as the conversion circuit mounting cards 165, 166, 167, 168 and the CPU 161 are electrically connected by inserting the conversion circuit mounting cards 165, 166, 167, 168 into the mechanism. It may be a configuration.
The CPU 161 (control processing unit) uses the digital signals output from the conversion circuit mounted cards 165, 166, 167, and 168 mounted in the card mounting mechanism, and controls the safety system control device 12 and the safety system control device. 13 control processes and the process of the central controller 11 are performed.

  In FIG. 2, reference numeral 121 (131) denotes a wiring board provided in the regular system control device 12 (safety system control device 13). The wiring board 121 (131) has an input terminal 2 for connecting a sensor signal cable and an output terminal 3 corresponding to the input terminal 2. The input terminal 2 of the wiring board 121 (131) is connected to a cable for sensor signals to be input to the regular system controller 12 (safety system controller 13). The decommissioning person in charge of the decommissioning process includes an output side terminal 3 corresponding to the input side terminal 2 to which the cable of the sensor signal is connected, and conversion circuit mounted cards 165, 166, and 167 inserted in the decommissioning measure dedicated control device 16. , 168, the connector of the conversion circuit mounted card to which the sensor signal is to be input is connected by a cable. Since the distance between the regular system control device 12 (safety system control device 13) and the dedicated decommissioning measure control device 16 is long, the cable is relayed via a relay device or the like.

  Moreover, in FIG. 2, the code | symbol 181 (191) has shown the wiring board with which the relay apparatus 18 (19) was equipped. The relay device 18 (19) includes an input terminal 4 for connecting a sensor signal cable, and an output terminal 5 corresponding to the input terminal. The input side terminal 4 of the relay device 18 (19) is connected to the other end of the cable connected to the service system (safety system) instruments and the control object 14 (15). The decommissioning person in charge of the decommissioning process includes the output side terminal 5 corresponding to the input side terminal 4 to which the cable of the sensor signal is connected, and the conversion circuit mounted cards 165, 166, and 167 inserted into the decommissioning measure dedicated control device 16. , 168, the connector of the conversion circuit card to which the sensor signal should be input may be connected by a cable. Also in this case, since the distance between the relay device 18 (19) and the decommissioning measure dedicated control device 16 is long, the cable is relayed via the relay device.

  As described above, the conversion circuit mounted cards 165, 166, 167, and 168 inserted into the decommissioning measure dedicated control device 16 can be subjected to a power shut-off process of being independently removed from the decommissioning measure dedicated control device 16. With this configuration, for example, the power supply to the conversion circuit mounted card corresponding to the instruments and the cables connected to the control target that are no longer required for sensing or control during the decommissioning measures can be stopped, and It is possible to reduce the amount of power for the processing of the CPU 161 accompanying sensing and control.

(Third embodiment)
FIG. 3 is a second diagram showing an outline of a process of connecting a cable to the dedicated control device for decommissioning measures.
The third embodiment differs from the second embodiment in that the decommissioning measure dedicated control device 16 in the third embodiment is different in configuration from the decommissioning measure dedicated control device 16 described in the second embodiment. doing. The decommissioning measure dedicated control device 16 according to the third embodiment is provided with one CPU corresponding to one or a plurality of groups of conversion circuit mounted cards. In FIG. 3, when the conversion circuit mounted cards 165, 166, 167, 168 and the CPUs 161-1, 161-2, 161-3, 161-4 are electrically connected in a one-to-one correspondence. An example is shown. The decommissioning measure dedicated control device 16 according to the third embodiment is different from the second embodiment in that it includes a power shut-off circuit 169.

In such a configuration, the decommissioning personnel can control the card equipped with the conversion circuit corresponding to the instruments and the cables connected to the controlled object that no longer require sensing or control during the decommissioning measures. A power shut-off process for removing from the device 16 is performed. Then, the conversion circuit mounted card from which the power cut-off circuit 169 has been removed is detected. For example, it is also possible to detect that the circuit is cut off by removing the conversion circuit mounted card and thereby detect that the conversion circuit mounted card has been removed. The power cut-off circuit 169 stores in advance a CPU to which the removed conversion circuit mounted card is electrically connected in a data table or the like, and the CPU (CPU 161-1, 161-2, 161-3, 161-4). Power supply to any one of the above. Alternatively, the CPU to which the removed conversion circuit mounted card is electrically connected may be detected by the mechanism of the electric circuit, and the supply of power to the CPU may be shut off.
By having such a configuration, for example, it is possible to stop the power supply to the conversion circuit mounted card corresponding to the instruments and the cables connected to the controlled object that are no longer required for sensing and control in the process of decommissioning, In addition, it is possible to reduce the amount of power for the processing of the CPU 161 accompanying the sensing and control.

  As described above, according to the nuclear plant control system and the dismantling method thereof, in the decommissioning measures of a large-scale nuclear power plant, the power demand, the installation space for various control facilities, and the air conditioning facilities associated with the control facilities are The demolition work can be efficiently carried out by monitoring and control using the decommissioning measure dedicated control device 16 and the decommissioning measure monitoring operation device 17 while reducing the number of steps in the process and maintaining necessary sensing signals. it can.

  The above-described central control device 11, normal system control device (normal system control panel) 12, safety system control device (safety system control panel) 13, dedicated decommissioning measure control device 16, decommissioning measure monitoring operation device 17, etc. And a computer system. Each process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

  The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 10 ... Central control room 11 ... Central control unit 12 ... Regular system control device 13 ... Safety system control device 14 ... Regular system instruments, control object 15 ... Safety system instrument Control target 16 ... Decommissioning measure dedicated control device 17 ... Decommissioning measure monitoring operation device 18, 19 ... Relay device 161 ... CPU
162 ... ROM
163 ... RAM
164... HDD
165 to 168... Conversion circuit mounted card 121, 131... Wiring board 181, 191.

Claims (11)

An ordinary system control device that performs a control process of normal operation control of a nuclear power plant;
A safety control device that performs a control process of safe operation control in the event of an abnormality in the nuclear power plant,
A central control device that at least performs input interface processing between the regular system control device and the safety system control device and recording processing of the control processing;
A method for dismantling a nuclear power plant control system comprising:
Of the sensor signals input to the normal system control device and the safety system control device, a sensor signal necessary for decommissioning of the nuclear power plant is input, the control processing of the normal system control device, and the safety system Decommissioning measures dedicated control device placement step for placing a control device dedicated to the decommissioning measures for performing control processing of the control device and processing of the central control device in a central control room where the central control device is located,
Air conditioning equipment for purifying or adjusting the temperature of the space where the regular system control device and the safety system control device are arranged, and where the system related to the regular system control device and the safety system control device is arranged An unnecessary equipment handling process for stopping or removing unnecessary equipment installed in the provided space;
A method for dismantling a nuclear power plant control system. An ordinary system control device that performs a control process of normal operation control of a nuclear power plant;
A safety control device that performs a control process of safe operation control in the event of an abnormality in the nuclear power plant,
A central control device that at least performs input interface processing between the regular system control device and the safety system control device and recording processing of the control processing;
A method for dismantling a nuclear power plant control system comprising:
Of the sensor signals input to the normal system control device and the safety system control device, a sensor signal necessary for decommissioning of the nuclear power plant is input, the control processing of the normal system control device, and the safety system A dedicated control device for decommissioning measures that performs control processing of the control device and processing of the central control device is arranged in the space where the central control device is arranged, the regular system control device, and the safety system control device. Decommissioning measures dedicated control device placement process to be placed in external space other than the existing space,
Air conditioning equipment for purifying or adjusting the temperature of the space where the regular system control device and the safety system control device are arranged, and where the system related to the regular system control device and the safety system control device is arranged An unnecessary equipment handling process for stopping or removing unnecessary equipment installed in the provided space;
A method for dismantling a nuclear power plant control system. The dedicated control device for decommissioning measures,
A card mounting mechanism for detachably mounting a plurality of conversion circuit mounting cards that input one or a plurality of sensor signals of the plurality of sensor signals and convert them into digital signals;
Using the digital signal output from the conversion circuit mounted card mounted on the card mounting mechanism, the control processing of the regular system control device, the control processing of the safety system control device, and the processing of the central control device A control processing unit for performing
A step of removing from the card mounting mechanism a conversion circuit mounting card that converts a sensor signal input from a sensor disposed in the dismantled space into the digital signal;
The dismantling method of the nuclear power plant control system of Claim 1 or Claim 2 which has these. The control processing unit of the decommissioning measures dedicated control device has the decommissioning measures dedicated control device provided corresponding to one or a plurality of the conversion circuit mounted cards,
A power shut-off step of shutting off the power of the control processing unit provided corresponding to the removed conversion circuit mounted card;
The dismantling method of the nuclear power plant control system of Claim 3 which has these. An ordinary system control device that performs a control process of normal operation control of a nuclear power plant;
A safety control device that performs a control process of safe operation control in the event of an abnormality in the nuclear power plant,
A central control device that at least performs input interface processing between the regular system control device and the safety system control device and recording processing of the control processing;
A nuclear power plant control system comprising:
Of the sensor signals input to the regular system control device and the safety system control device, the sensor signal necessary for decommissioning of the nuclear power plant is input, the control process of the regular system control device, and the safety system control A nuclear power plant control system comprising: a dedicated control device for decommissioning measures that performs control processing of the device and processing of the central control device.   The nuclear power plant control system according to claim 5, wherein the decommissioning measures dedicated control device includes a monitoring operation device and a recording device.   6. The dedicated control device for decommissioning measures is disposed in a central control room in which the central control device is disposed, or in a control panel room in which the regular system control device and the safety system control device are disposed. Or the nuclear power plant control system of Claim 6. The dedicated control device for decommissioning measures is:
A card mounting mechanism for detachably mounting a plurality of conversion circuit mounting cards that input one or a plurality of sensor signals of the plurality of sensor signals and convert them into digital signals;
Using the digital signal output from the conversion circuit mounted card mounted on the card mounting mechanism, the control processing of the regular system control device, the control processing of the safety system control device, and the processing of the central control device A control processing unit for performing
A nuclear power plant control system according to any one of claims 5 to 7.   The nuclear power plant control system according to claim 8, wherein the control processing unit has the decommissioning measure dedicated control device provided corresponding to one or a plurality of the conversion circuit mounted cards. The dedicated control device for decommissioning measures is:
The power supply cutoff circuit which cuts off the power supply with respect to each of the said control processing part provided corresponding to one or several collection of the said conversion circuit mounting card | curd separately, respectively. Nuclear plant control system. The dedicated control device for decommissioning measures is:
The nuclear power plant control system according to any one of claims 5 to 10, wherein the nuclear power plant control system is connected to a wireless display terminal for facilitating maintenance and management of a central control room or the like in the decommissioning work.

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