JP6822992B2 - Central control outdoor reactor shutdown system - Google Patents

Description

The present invention is necessary for maintaining a high temperature shutdown of a nuclear reactor related to a safe shutdown of the reactor and for shifting to and maintaining a low temperature shutdown from outside the central control room when an operator cannot access the central control room. The present invention relates to a central control outdoor reactor shutdown device installed for the purpose of safely shutting down a reactor in a scrum state from outside the central control room by monitoring and controlling various equipment.

The central control outdoor reactor shutdown system (Remote Shutdown System, hereinafter referred to as "RSS") is related to the safe shutdown of the reactor from outside the central control room when the operator cannot access the central control room. It is installed for the purpose of safely shutting down a reactor in a scrum state from outside the central control room by monitoring and controlling the equipment necessary for maintaining the high temperature shutdown of the reactor and shifting to and maintaining the low temperature shutdown. RSS has a control panel dedicated to RSS (hereinafter referred to as "RSS board") installed in a dedicated room (hereinafter referred to as "RSS room") to perform monitoring operations.

For example, as disclosed in Patent Document 1, the equipment to be monitored and operated to achieve the RSS function is usually monitored and cooled from the central control room from the viewpoint of equipment reliability. The equipment is shared, and operation is possible by switching the monitoring / operation end from the main control room to RSS.
Further, Patent Document 2 makes it easy to switch between a control device that can be connected to a control device (operation end) in the central control room and a control device in the second control room (RSS room) outside the central control room, but erroneously. A configuration for reducing switching is disclosed. Specifically, a first changeover switch, a second changeover switch, and an AND circuit are provided, and the operator performs a changeover operation from the normal connection side to the emergency connection side, so that the first changeover switch moves toward the AND circuit. Switching signal is output. Further, the second changeover switch provided in the retracted area is connected to the input side of the AND circuit, and this second changeover switch is also the normal connection side and the emergency connection side (RSS side) like the first changeover switch. When the operator performs a switching operation from the normal connection side to the emergency connection side (RSS side), the emergency switching signal is transmitted from the second changeover switch to the AND circuit. It is output. As a result, even if an emergency changeover signal is output from either the first changeover switch or the second changeover switch due to an erroneous operation or a short circuit, the AND circuit does not output the emergency changeover signal, which is erroneous. The configuration is such that the occurrence of switching can be reduced.

JP-A-59-174787A Japanese Unexamined Patent Publication No. 2012-83232

By the way, in the new regulatory standards that came into effect on July 8, 2013, the requirements for fire protection are more detailed than before, and important safety equipment that may affect the safe shutdown of the reactor ( Hereinafter, "equipment subject to fire protection") and raceway (general term for cables and conduits, hereinafter referred to as "cable subject to fire protection") are electrically and physically used to reduce the effects of fire. In addition to the separation, "fireproof wall for 3 hours or more", "horizontal distance 6 m or more and fire detection equipment and automatic fire extinguishing equipment", or "fireproof wall for 1 hour or more and fire detection equipment and automatic fire extinguishing equipment" Separation for fire protection must be performed by one of three methods.

Therefore, in the configurations disclosed in Patent Document 1 and Patent Document 2 described above, the route (or connection cable) from the central control room to the device / instrument is positioned as the cable subject to fire protection, and therefore the RSS room is set as the new regulatory standard. In order to make it compatible, it is necessary to have a configuration as shown in FIG. 2, for example. Here, FIG. 2 is a diagram when the above-mentioned conventional RSS is configured to conform to the new regulatory standard. As shown in FIG. 2, a fire protection separation 60 must be provided between the two series of RSS control panels A33a and RSS control panel B33b containing the fire protection target cables 50a and 50b. However, by providing a fire protection separation 60 between the two series of RSS control panels A33a and RSS control panel B33b, which were conventionally installed adjacent to each other, the equipment is multiplexed to achieve the RSS function. There is a risk that the monitoring operability when using multiple series of the above at the same time will be impaired.
Therefore, the present invention provides a central control outdoor reactor shutdown system that can meet the fire protection separation requirements for safety-critical equipment under the new regulatory standards without compromising monitoring operability.

In order to solve the above problems, the central control outdoor reactor shutdown system according to the present invention constitutes a first system installed in the first area of the central control room provided with fire protection separation. The control device, the second control device that constitutes the second system installed in the second area, and the first area outside the central control room, which is separated for fire protection, are installed. Central control outdoor reactor shutdown device that is electrically connected to the first switch , the second switch installed in the second area, and the first switch by a signal line that is not subject to fire protection. The first operation end and the second operation end of the central control outdoor reactor shutdown device, which are electrically connected to the second switch by a signal line not subject to fire protection, are provided. The device and the first switch are electrically connected by a first fire protection target cable, and the second control device and the second switch are electrically connected by a second fire protection target cable. between the first operating end and a second operating end of the central control outdoor reactor shutdown system of the central control outdoor reactor shutdown device is characterized in that the separation of the fire protection has not been subjected.

According to the present invention, it is possible to provide a central control outdoor reactor shutdown system capable of satisfying the fire protection separation requirements for safety-critical equipment according to the new regulatory standards without impairing monitoring operability.
Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is an overall schematic block diagram which shows the RSS control equipment configuration which concerns on one Example of this invention. It is an overall schematic block diagram when the conventional RSS control equipment is configured to conform to a new regulatory standard.

Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 is an overall schematic configuration diagram showing an RSS control equipment configuration according to an embodiment of the present invention. As shown in FIG. 1, the RSS control equipment according to this embodiment shows a case where the RSS control equipment is multiplexed into two systems as an example. In the central control room 1, an operation end A11a constituting the first system as a monitoring operation end of the central control room and an operation end B11b constituting the second system are installed, and further, a fireproof wall of the control device room 2 Alternatively, the control device A21a constituting the first system as the central control room control device and the control device B21b constituting the second system are located in the two areas provided with the separation 60 for fire protection such as the separation distance, respectively. is set up. The operation end A11a constituting the first system and the control device A21a are electrically connected by a fire protection target cable 50a, and the operation end B11b and the control device B21b constituting the second system are connected to the fire protection target cable. It is electrically connected at 50b.

On the other hand, in the RSS room 3 installed outside the central control room, the RSS operation terminal A31a constituting the first system and the RSS operation end B31b constituting the second system are installed without being particularly separated, and The fire protection target cable 50a of the first system and the fire protection target cable 50b of the second system do not pass through the RSS chamber 3.
In the two areas where the separation 60 for fire protection such as the installation of a fireproof wall installed outside the RSS room is performed, the switch A32a constituting the first system and the switch B32b constituting the second system are respectively. is set up. The switch A32a constituting the first system is electrically connected to the control device A21a constituting the first system described above by a fire protection target cable 50a, and the switch B32b constituting the second system is It is electrically connected to the control device B21b constituting the second system described above by the fire protection target cable 50b. Further, the switch A32a constituting the first system is electrically connected to the RSS operation terminal A31a constituting the first system installed in the RSS chamber 3 by a signal line 34a to form a second system. The switch B32b is electrically connected to the RSS operation end B31b constituting the second system installed in the RSS chamber 3 by a signal line 34b. These signal lines 34a and 34b are not subject to fire protection.

The safety equipment room 4 has two areas provided with separation 60 for fire protection such as installation of a fireproof wall, and in one area, the control device A21a and the RSS operation end A31a constituting the first system are used. A safety device A41a, which is a shared safety device / instrument, is installed, and in the other area, a safety device / instrument shared by the control device B21b and the RSS operation end B31b constituting the second system. A certain safety device B41b is installed. The switch A32a constituting the first system and the safety system device A41a are electrically connected by a cable 50a subject to fire protection, and the switch B32b and the safety system device B41b constituting the second system are fired. It is electrically connected by the protected cable 50b.

If a situation occurs in which the operator cannot approach the central control room 1 and the operation ends A11a and 1 operation end B11b, which are the operation ends of the central control room, become unusable, the operator is outside the RSS room 3. By moving to an area provided with a fire protection separation 60 such as a fireproof wall or a separation distance, for example, by turning on the changeover switch of the changeover device A32a constituting the first system from the central control room side to the RSS side. By switching the control circuit of the safety device A41a, which is a safety device / instrument, from the operation end A11a of the central control room 1 to the RSS operation end A31a, the control is switched from the central control room 1 to the RSS room 3. Here, the RSS operation end A31a is a display device that displays the status of the safety device A41a, which is an instrument / device shared by the central control room 1 and the RSS room 3, and an operation device that operates the safety device A41a by an operation switch. Is an integrated monitoring operation end. For example, the operator grasps the state of the safety system device A41a at the RSS operation end A31a constituting the first system, and appropriately operates the RSS operation end A31a to perform the reactor safety stop operation from the scrum state. The same applies to the RSS operation end B31b constituting the second system.

Since it is necessary to use two series of devices that are required to be multiplicity in order to achieve the RSS function, the safety device A41a, which is a safety device / instrument shared by the central control room 1 and the RSS room 3, and safety. The system equipment B41b, the RSS operation end A31a and the RSS operation end B31b, the switch A32a and the switch B32b, the control device A21a and the control device B21b, and the central control room operation end 11 are electrically and physically separated from each other. There are two series that have been given. In addition, the control circuit from the central control room 1 to the equipment important for safety is positioned in the fire protection target cable 50, and a fireproof wall is installed between the two series of fire protection target cables 50a and the device having the fire protection target cable 50b. Separation 60 for fire protection is performed.

As described above, according to this embodiment, it is possible to provide a central control outdoor reactor shutdown device capable of satisfying the fire protection separation requirements for safety-critical equipment according to the new regulatory standards without impairing monitoring operability. It becomes.

The present invention is not limited to the above-mentioned examples, and includes various modifications. For example, the above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the described configurations.

1 ... Central control room 2 ... Control device room 3, 3'... RSS room 4 ... Safety equipment room 11a ... Operation end A
11b ... Operation end B
21a ... Control device A
21b ... Control device B
31a ... RSS operation end A
31b ... RSS operation end B
32a ... Switch A
32b ... Switch B
33a ... RSS control panel A
33b ... RSS control panel B
34a, 34b ... Signal line 41a ... Safety device A
41b ... Safety device B
50a, 50b ... Cables subject to fire protection 60 ... Separation for fire protection such as installation of fireproof walls

Claims (3)

A central control outdoor reactor shutdown system in which the control of safety equipment is switched from the central control room to the central control outdoor reactor shutdown device by a switch.
The first control device that constitutes the first system installed in the first area of the central control room that has been separated for fire protection and the second system that constitutes the second system installed in the second area Control device and
A first switch installed in a first area outside the main control room and separated for fire protection, a second switch installed in a second area, and a second switch.
Signals that are not subject to fire protection to the first operating end of the central control outdoor reactor shutdown device and the second switch that are electrically connected to the first switch by a signal line that is not subject to fire protection. It is equipped with a second operating end of the central control outdoor reactor shutdown device, which is electrically connected by a wire.
The first control device and the first switch are electrically connected by a first fire protection target cable, and the second control device and the second switch are electrically connected by a second fire protection target cable. Connected to
The central control outdoor reactor is characterized in that no fire protection separation is provided between the first operating end of the central control outdoor reactor shutdown device and the second operating end of the central control outdoor reactor shutdown device . Reactor shutdown system . In the central control outdoor reactor shutdown system according to claim 1.
The first switch is electrically connected to the safety equipment installed in the first area where the fire protection is separated by the first fire protection target cable.
The second switch is a central control characterized in that it is electrically connected to a safety system device installed in a second area provided for fire protection by a cable subject to the second fire protection. Outdoor reactor shutdown system . In the central control outdoor reactor shutdown system according to claim 2.
The first system is composed of the first control device, the first switch, the first operation end of the central control outdoor reactor shutdown device , and the safety system equipment installed in the first area.
The second system is composed of the second control device, the second switch, the second operation end of the central control outdoor reactor shutdown device , and the safety system equipment installed in the second area. Characterized central control outdoor reactor shutdown system .

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