Control system and method for nuclear power facility

Patent metadata

Field	Value
Publication number	US-9627877-B2
Application number	US-201113876775-A
Country	US
Kind code	B2
Filing date	Sep 13, 2011
Priority date	Oct 12, 2010
Publication date	Apr 18, 2017
Grant date	Apr 18, 2017

Abstract

A nuclear power control system includes: a safety protection apparatus which outputs a first safety mode operating signal while outputting a first unsafety mode operating signal; a CCF apparatus that outputs a second safety mode operating signal; and a signal input/output circuit that is connected to the safety protection apparatus and the CCF apparatus. The signal input/output circuit includes an OR circuit that outputs a third safety mode operating signal based on the presence or absence of an input of the first safety mode operating signal and the second safety mode operating signal; a NOT circuit that is connected to the output side of the OR circuit; and an AND circuit that outputs a third unsafety mode operating signal, and the presence and absence of an input of a first unsafety mode operating signal.

First claim

The invention claimed is:

1. A control system for a nuclear power facility comprising:
a main control device arranged to output a first safety mode operating signal when judging that an abnormality occurs in the nuclear power facility, and arranged to output a first normal mode operating signal when judging that the nuclear power facility operates normally;
an auxiliary control device arranged to output a second safety mode operating signal when judging that an abnormality occurs in the nuclear power facility, and not to output the second safety mode operating signal even when judging that an abnormality occurs in the nuclear power facility if the main control device operates normally; and
an operating signal input/output unit arranged to receive the operating signals output from the main control device and the auxiliary control device, and arranged to output a third safety mode operating signal that operates an apparatus provided in the nuclear power facility to a safety mode or to output a second normal mode operating signal that operates the apparatus to a normal mode based on the received operating signals,
wherein the operating signal input/output unit includes:
an OR circuit configured to be connected to the main control device at one of an input side thereof, and configured to be connected to the auxiliary control device at an other of the input side thereof, the OR circuit is arranged to output the third safety mode operating signal to the apparatus when at least the first safety mode operating signal from the main control device, and the second safety mode operating signal are input,
a NOT circuit of which an input side is connected to an output side of the OR circuit, and arranged to output a negated third safety mode operating signal, and
an AND circuit of which one of an input side is connected to an output side of the NOT circuit, of which other of the input side is connected to the main control device, and of which output side is connected to the apparatus, the AND circuit is arranged to output the second normal mode operating signal to the apparatus based on an input of the negated third safety mode operating signal and of the first normal mode operating signal,

wherein the apparatus operates in the safety mode when the second normal mode operating signal is not input and the third safety mode operating signal is input, and
wherein the auxiliary control device does not output a normal mode operating signal which is for operating the apparatus in normal mode.

2. The control system according to claim 1 , wherein the auxiliary control device includes:
an automatic auxiliary control unit arranged to automatically output the second safety mode operating signal when an abnormality occurs in the nuclear power facility,
a manual auxiliary control unit for manually outputting the second safety mode operating signal, and
an auxiliary side OR circuit arranged to output the second safety mode operating signal based on an input of the second safety mode operating signal, which is output from the automatic auxiliary control unit, and an input of the second safety mode operating signal, which is output from the manual auxiliary control unit.

3. The control system according to claim 2 , wherein the manual auxiliary control unit includes:
an operation unit arranged to manually output the second safety mode operating signal,
signal output permission unit arranged to output an enabling signal that permits an output of the second safety mode operating signal by the operation unit, and
an auxiliary side AND circuit arranged to output the second safety mode operating signal based on an input of the second safety mode operating signal from the operation unit, and an input of the enabling signal.

4. The control system for the nuclear power facility according to claim 3 , wherein the signal output permission unit is a circuit breaker that supplies power to the manual auxiliary control unit, and the enabling signal is input to the auxiliary side AND circuit when power is supplied to the manual auxiliary control unit by the circuit breaker.

5. A control method for a nuclear power facility comprising:
outputting, by a main control device, a first safety mode operating signal when judging that an abnormality occurs in the nuclear power facility, and outputting a first normal mode operating signal when judging that the nuclear power facility operates normally;
outputting, by an auxiliary control device, a second safety mode operating signal when judging that an abnormality occurs in the nuclear power facility, and not outputting the second safety mode operating signal even when judging that an abnormality occurs in the nuclear power facility if the main control device operates normally; and
receiving, by an operating signal input/output unit, the operating signals that are output from the main control device and the auxiliary control device, and outputting a third safety mode operating signal that operates an apparatus provided in the nuclear power facility to a safety mode or a second normal mode operating signal that operates the apparatus to a normal mode based on the received operating signals,
wherein the receiving and outputting by the operating signal input/output unit includes:
outputting, by an OR circuit configured to be connected to the main control device at one of an input side thereof, and configured to be connected to the auxiliary control device at an other of the input side thereof, the third safety mode operating signal to the apparatus when at least the first safety mode operating signal from the main control device, and the second safety mode operating signal are input,
outputting, by a NOT circuit of which an input side is connected to an output side of the OR circuit, a negated third safety mode operating signal, and
outputting, by an AND circuit of which one of an input side is connected to an output side of the NOT circuit, of which an other of the input side is connected to the main control device, and of which an output side is connected to the apparatus, the second normal mode operating signal to the apparatus based on an input of the negated third safety mode operating signal and of the first normal mode operating signal,

wherein the apparatus operates in the safety mode when the second normal mode operating signal is not input and the third safety mode operating signal is input, and
wherein the auxiliary control device does not output a normal mode operating signal which is for operating the apparatus in normal mode.

6. The control method according to claim 5 , wherein the outputting and assisting by the auxiliary control device includes:
automatically outputting, by an automatic auxiliary control unit, the second safety mode operating signal when an abnormality occurs in the nuclear power facility,
manually, by a manual auxiliary control unit, outputting the second safety mode operating signal, and
outputting, by an auxiliary side OR circuit, the second safety mode operating signal based on an input of the second safety mode operating signal output from the automatic auxiliary control unit, and an input of the second safety mode operating signal output from the manual auxiliary control unit.

7. The control method according to claim 6 , wherein the manually outputting by the manual auxiliary control unit includes
manually outputting, by an operation unit, the second safety mode operating signal,
outputting, by a signal output permission unit, an enabling signal that permits an output of the second safety mode operating signal by the operation unit, and
outputting, by an auxiliary side AND circuit, the second safety mode operating signal based on an input of the second safety mode operating signal output from the operation unit, and a

Assignees

• Fujimoto Hiroshi
• Shinohara Hironobu
• Akizuki Yasutake
• Fukui Toshiki
• Tanaka Yuichi
• Kiuchi Shinji
• Shirasawa Hiroshi
• Mitsubishi Heavy Ind Ltd

Inventors

• Fujimoto Hiroshi
• Shinohara Hironobu
• Akizuki Yasutake
• Fukui Toshiki
• Tanaka Yuichi
• Kiuchi Shinji
• Shirasawa Hiroshi

Classifications

• Y02E30/40

  Cross-Sectional Technologies · mapped topic

• G21D3/04 Primary

  Safety arrangements (emergency protection of reactor G21C9/00) · CPC title

• H02H3/05 Primary

  with means for increasing reliability, e.g. redundancy arrangements {(for logic circuits H03K19/003)} · CPC title

• G21D3/001

  Computer implemented control · CPC title

• Y02E30/00

  Energy generation of nuclear origin · CPC title