JP3595661B2 - Nuclear power plant safety protection system controller - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a nuclear power plant safety protection system control device for controlling equipment of a nuclear power plant safety protection system.
[0002]
[Prior art]
As shown in FIG. 2, a conventional safety protection system control device for a nuclear power plant controls four physically separated division control devices 1a, 1b, when controlling one device 11 of the safety protection system. Four control signals are individually calculated in 1c and 1d, respectively, and the logic circuit 10 selects a control signal in which two or more of the four control signals match by the logic of (2 out of 4), and the safety protection system. Output to the device 11.
[0003]
That is, the automatic start signals 3a, 3b, 3c and 3d having the same contents for starting the equipment 11 of the safety protection system are individually input to the respective sort control devices 1a, 1b, 1c and 1d. In addition, single bypass signals 2a, 2b, 2c, and 2d for invalidating the automatic activation signals 3a, 3b, 3c, and 3d are input to the respective sorting control devices 1a, 1b, 1c, and 1d.
[0004]
The single section bypass signals 2a, 2b, 2c, and 2d cause a failure of the sensor that detects the process value of the plant that is the source of the automatic start signals 3a, 3b, 3c, and 3d during plant operation or when the plant is stopped. This signal is input from the bypass switch 12 in the case where the automatic start signals 3a, 3b, 3c, and 3d are blocked in the periodic inspection of the sensor. Therefore, during the normal operation, the single section bypass signals 2a, 2b, 2c, and 2d are not input.
[0005]
Since each of the partitioning control devices 1a, 1b, 1c, and 1d has the same configuration, FIG. 2 shows only the circuit configuration of the partitioning control device 1a. In the following description, the partitioning control device 1a will be described. The automatic start signal 3a is input to the AND circuit 13, and the single bypass signal 2a for invalidating the automatic start signal 3a is input to the AND circuit 13 via the NOT circuit 14. Since the single bypass signal 2a is not input during the normal operation, the operation unit 15 is started when the automatic start signal 3a is input, the control signal is calculated and output to the logic circuit 10.
[0006]
FIG. 3 is an explanatory diagram of the bypass switch 12. The bypass switch 12 has five positions, switches these five positions, and generates only one signal. One of the automatic activation signals 3a, 3b, 3c, and 3d is used. Individuals can be stopped. It is normally in the neutral position.
[0007]
[Problems to be solved by the invention]
However, in such a conventional safety protection system control device for a nuclear power plant, in the periodic inspection of various sensors that are the source of the automatic activation signals 3a, 3b, 3c, and 3d, the automatic activation signal of the sensor to be inspected is transmitted to the bypass switch 12 Must be invalidated one by one. Therefore, it takes time for inspection.
[0008]
In other words, the bypass switch 12 must be switched for each sensor to be inspected in order to invalidate the automatic start signal 3 generated when the sensor signal is increased or decreased during the inspection of the sensor. As described above, since the section where the automatic start signal 3 can be invalidated is only one arbitrary section, it is necessary to sequentially proceed with the inspection work one section at a time. was there.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a safety system control device for a nuclear power plant in which automatic start signals to all the group control devices can be collectively invalidated and periodic inspection of sensors in all the classes can be performed in parallel. It is in.
[0010]
[Means for Solving the Problems]
Safety protection system controller of a nuclear plant according to a first aspect of the invention, each individually safety protection system the safety protection system control signals that control system equipment to enter the automatic start signal of the device of the nuclear power plant a plurality of segment control unit for calculating, a bypass switch for a plurality of segment control selects one of the device disables the automatic startup signal inputted to the sorting control unit bypass mode, the A safety circuit control device for a nuclear power plant, comprising: a logic circuit that selects a control signal that matches two or more of the control signals individually calculated by the plurality of divided control devices and outputs the selected control signal to the device of the safety protection system. in bulk bar to collectively bypass mode and disable automatic startup signal input to all of the sorting control device selects all simultaneously the plurality of the sorting control device The path switch is provided, also, is characterized in the provision of the collective bypass mode alarm circuit for informing the operator that all of these categories control the a batch bypass mode.
[0011]
The safety protection system control device for a nuclear power plant according to the first aspect of the present invention provides a control signal for controlling a safety protection system device by a plurality of division control devices when an automatic start signal is input during normal operation. An arithmetic operation is performed, and a control signal having two or more of these control signals is selected by a logic circuit and output to a safety protection system device. On the other hand, at the time of inspection of the sensor of the automatic activation signal, the bypass switch selects one of the plurality of division control devices and sets the bypass mode to invalidate the automatic activation signal input to the division control device. Further, the collective bypass switch selects all of the plurality of section control devices and sets a collective bypass mode in which the automatic start signals input to the plurality of section control devices are invalidated. When the collective bypass mode is set by the collective bypass switch, the fact is output to the collective bypass mode alarm circuit to notify the operator.
[0012]
The safety protection system control device for a nuclear power plant according to the invention of claim 2 is provided in each of the plurality of division control devices in the invention of claim 1 , and the division control device is operated in collective bypass mode when the collective bypass switch is turned on. Is provided with a permission switch for permitting the following.
[0013]
In the safety protection system control device for a nuclear power plant according to the invention of claim 2 , in addition to the operation of the invention of claim 1 , selection of the collective bypass mode by the collective bypass switch is permitted by turning on the permission switch. That is, as long as the permission switch is not turned on, the collective bypass mode is not set even if the collective bypass switch is turned on. This prevents careless switching to the batch bypass mode.
[0014]
According to a third aspect of the present invention, in the safety protection system control device for a nuclear power plant according to the second aspect of the present invention, a collective bypass permission alarm for notifying an operator that the permission switch is turned on and the collective bypass mode is permitted. A circuit is provided.
[0015]
In the safety protection system control device for a nuclear power plant according to the third aspect of the present invention, in addition to the operation of the second aspect of the present invention, the collective bypass permission alarm circuit operates when the permission switch is turned on to permit the collective bypass mode. Notify members. This prevents erroneous operation of the operator.
[0016]
According to a fourth aspect of the present invention, in the nuclear power plant safety protection system control device according to the first to third aspects, the nuclear power plant is turned on when the nuclear power plant is stopped, and the collective bypass mode is enabled by the collective bypass switch. It is provided with a reactor mode switch for setting a state.
[0017]
According to the safety control system for a nuclear power plant according to the invention of claim 4 , in addition to the effects of the inventions of claims 1 to 3 , the reactor mode switch is turned on when the nuclear power plant is stopped. , The batch bypass mode is enabled by the batch bypass switch. As a result, the batch bypass mode is set only when the plant is stopped, and it is possible to prevent the automatic start signal to the safety protection system from being inadvertently invalidated during the plant operation.
[0018]
According to a fifth aspect of the present invention, there is provided a safety protection system control device for a nuclear power plant, wherein the collective bypass switch is detachable and portable in the first to fourth aspects of the invention.
[0019]
According to the safety protection system control device for a nuclear power plant according to the fifth aspect of the present invention, in addition to the effects of the first to fourth aspects of the present invention, the removable portable collective bypass switch is provided to the sorting control device when it is used. Attach or remove from the sorting control unit when not in use. This physically removes a factor that invalidates and invalidates the automatic start signal during plant operation.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described. FIG. 1 is a configuration diagram of a safety protection system control device of a nuclear power plant according to an embodiment of the present invention. This embodiment is different from the conventional example shown in FIG. 2 in that a collective bypass switch 6 and a reactor mode switch 5 are provided commonly to four division control devices 1a, 1b, 1c, and 1d, and a collective bypass permission alarm is provided. The circuits 8a, 8b, 8c, 8d, the permission switches 4a, 4b, 4c, 4d, and the collective bypass mode alarm circuits 9a, 9b, 9c, 9d are individually provided for each of the division control devices 1a, 1b, 1c, 1d. It is provided.
[0023]
The collective bypass switch 6 is provided commonly to the four sorting control devices 1a, 1b, 1c, and 1d, and selects all the four sorting control devices 1a, 1b, 1c, and 1d to set the four sorting control devices 1a. , 1b, 1c and 1d are invalidated and the collective bypass mode is set. Also, the reactor mode switch 5 is provided commonly to the four sorting controllers 1a, 1b, 1c and 1d, and is turned on when the nuclear power plant is stopped. This is to make it possible.
[0024]
On the other hand, the collective bypass mode alarm circuits 9a, 9b, 9c, 9d are provided in the four sort control devices 1a, 1b, 1c, 1d, respectively, and notify the operator of the collective bypass mode. The permission switches 4a, 4b, 4c, and 4d are provided in the four sorting control devices 1a, 1b, 1c, and 1d, respectively. When the batch bypass switch 6 is turned on, the sorting control devices 1 enter the batch bypass mode. And the collective bypass permission alarm circuits 8a, 8b, 8c, 8d notify the operator that the permission switches 4a, 4b, 4c, 4d are turned on and the collective bypass mode is permitted. Things.
[0025]
Hereinafter, since each of the division control devices 1a, 1b, 1c, and 1d has the same configuration, the division control device 1a will be described as a representative. In addition to the single bypass signal 2a and the automatic start signal 3a, the section control device 1a receives a permission signal from the permission switch 4a, a plant stop signal from the reactor mode switch 5, a collective bias signal of the collective bypass switch 6, Is entered.
[0026]
The automatic start signal 3a is input to the AND circuit 13, and the single bypass signal 2a for invalidating the automatic start signal 3a is input to the AND circuit 13 via the NOT circuit 14. During normal operation, since the single bypass signal 2a and the output signal of the AND circuit 16 to be described later are not input, the operation unit 15 is started when the automatic start signal 3a is input, the control signal is operated, and the logic circuit 10 is operated. Is output to
[0027]
The permission signal from the permission switch 4a, the plant stop signal from the reactor mode switch 5, and the collective bias signal of the collective bypass switch 6 are input to the AND circuit 16. Since the collective bias mode is permitted when the plant is stopped, the reactor mode switch is turned on when the plant is stopped and the sensor is checked, and the collective bypass mode by the collective bypass switch 6 is enabled. Thereby, the interlock is applied so that the batch bypass mode is not set during the operation of the plant.
[0028]
With the reactor mode switch 5 turned on and the batch bypass mode enabled, the permission switch 4a selects whether or not the sorting control device 1a is to be subjected to the batch bypass mode. When the permission switch 4a is turned on, it indicates that the sorting control device 4a is in the collective bypass mode. This information is output to the batch bypass mode alarm circuit 9a so that the operator can easily determine whether or not the operator is in the batch bypass mode.
[0029]
When the collective bypass switch 6 is turned on with the reactor mode switch 5 turned on and the permission switch 4a turned on, the output of the AND circuit 16 is established and the output of the AND circuit 13 is blocked via the NOT circuit 17. I do. Therefore, the output of the automatic start signal 3a is prevented. In this case, the fact is output to the collective bypass mode alarm circuit 9a so that the operator can easily determine that the collective bypass mode is set.
[0030]
As described above, as one of the plant shutdown operation procedures, the operator turns on the reactor mode switch 5, and after this operation, the permission switches 4a, 4b, 4c, 4d for each of the division control devices 1a, 1b, 1c, 1d. Are allowed one by one. When the permission switches 4a, 4b, 4c, and 4d are turned on, the permission state is output to the collective bypass permission alarm circuits 8a, 8b, 8c, and 8d to notify the operator. Finally, by turning on the collective bypass switch 6, all the conditions of the AND circuit 16 are satisfied, and the automatic start signals 3a, 3b, 3c, 3d of all the sorting control devices 1a, 1b, 1c, 1d are stopped, and at the same time, The collective bias mode alarm circuits 9a, 9b, 9c, 9d operate during the bypass operation of the section.
[0031]
As for the release method, the collective bypass switch 6 is turned off and the permission switch 4 is turned off to perform the release. However, even if the recovery is forgotten, it can be confirmed by the alarm circuits 8 and 9 and the plant is started. Since the position of the reactor mode switch 6 is sometimes set to the "start" position, the reactor is automatically released and the automatic start signal is not erroneously blocked during plant operation.
[0032]
In the above description, the permission switch 4 and the reactor mode switch 6 are provided, but these may be omitted. Further, the alarm circuits 8 and 9 can be omitted. Further, the collective bypass switch 6 may be configured to be detachable from the sorting control device 1, for example, to be connected by a detachable connector, and the collective bypass switch 6 may be used only when the collective bypass mode is set. good. By doing so, it is possible to prevent the batch bypass mode from being set during plant operation.
[0033]
【The invention's effect】
As described above, according to the present invention, it is possible to collectively stop the automatic start signals of all the division control devices simply by operating the collective bypass switch provided in common to all the division control devices. , concurrent progress of the regular inspections of the sensor becomes possible, shortening the construction period can be expected. Further, even in the release operation at the time of plant operation, the reactor mode switch and the alarm circuit can reliably return to the original state without leakage, thereby ensuring the safety of the plant.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a safety protection system control device of a nuclear power plant according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a conventional safety protection system control device for a nuclear power plant.
FIG. 3 is an explanatory diagram of a bypass switch in a conventional safety protection system control device for a nuclear power plant.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Section control apparatus 2 Single bypass signal 3 Automatic start signal 4 Permission switch 5 Reactor mode switch 6 Batch bypass switch 8 Batch bypass permission alarm circuit 9 Batch bypass mode alarm circuit 10 Logic circuit 11 Equipment 12 Bypass switch 13 AND circuit 14 NOT Circuit 15 Operation unit 16 AND circuit 17 NOT circuit

Claims (5)

A plurality of segment control unit for calculating individual safety protection system the safety protection system control signals that control system equipment to enter the automatic start signal of the device of the nuclear power plant each of the plurality of the sorting control device A bypass switch for selecting any one of the sections and invalidating the automatic start signal input to the section control device and setting a bypass mode; and 2 of the control signals individually calculated by the plurality of section controllers. in the safety protection system controls the nuclear power plant having a logic circuit for outputting to the safety protection system equipment by selecting a control signal that matches the above, all of these simultaneously selecting all of the plurality of the sorting control device bulk bypass switch to disable the automatic activation signal inputted to the sorting control device and collective bypass mode provided,
A safety protection system control device for a nuclear power plant, wherein a batch bypass mode alarm circuit for notifying an operator of the batch bypass mode is provided in all of these division control devices. Respectively provided on the plurality of the sorting control device according to claim 1 Symbol, wherein the bulk pi path switch is the sorting control device when turned on providing a permission switch for permitting to become collective bypass mode Safety control system for nuclear power plant. 3. The control device according to claim 2 , further comprising a batch bypass permission alarm circuit for notifying an operator that the permission switch is turned on and permitting the batch bypass mode. . It is turned on when the state of a nuclear power plant has stopped, according to claims 1 to 3, characterized in that a reactor mode switch for collectively bypass mode state by the collective bypass switch Safety protection system controller for nuclear power plants. Safety protection system controller of a nuclear plant according to claims 1 to 4, characterized in that a by-friendly transportable detachable the bulk bypass switch.

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