Control system for nuclear facilities

摘要

Provided are a safety protection system facility 43 outputting a normal actuating signal S1 in a case where the safety protection system facility 43 controls actuation of a unit provided in a nuclear facility to a safe side based on an abnormality detecting signal output at the time of occurrence of an abnormality in the nuclear facility, and where this causes the unit to be actuated normally, and a CCF countermeasure facility 44 outputting a CCF-case actuating signal S2 actuating the unit to a safe side in a case where the CCF countermeasure facility 44 determines from output results of the abnormality detecting signal and the normal actuating signal S1 that the unit is not actuated normally at the time of occurrence of the abnormality in the nuclear facility.

主权项

1. A control system for a nuclear facility comprising:
a detecting sensor provided in a nuclear facility and configured to output an abnormality detecting signal at the time of occurrence of an abnormality in the nuclear facility; a main control device including a programmable processor configured to output a normal actuating signal when a unit is actuated normally in consequence of controlling the unit provided in the nuclear facility to a safe side based on the abnormality detecting signal; and an auxiliary control device, as an auxiliary of the main control device, configured to output an auxiliary actuating signal to actuate the unit to a safe side in a case where the auxiliary control device determines from output results of the abnormality detecting signal and the normal actuating signal that the unit is not actuated normally for the abnormality in the nuclear facility, wherein the auxiliary control device includes: a NOT circuit connected to an output side of the main control device, and configured to output a signal when the normal actuating signal is not input, and not to output the signal when the normal actuating signal is input; and a first AND circuit configured not to output the auxiliary actuating signal when at least one of the signal from the NOT circuit and the abnormality detecting signal is not input, and configured to output the auxiliary actuating signal when the signal from the NOT circuit and the abnormality detecting signal are input, wherein the detecting sensor is connected to an input side of the first AND circuit via a delay circuit and the main control device is connected to another input side of the first AND circuit via the NOT circuit.