Mitsubishi Heavy Industries Limited

Mitsubishi Electric Corporation

Yasutake Akizuki

Hironobu Shinohara

Hiroshi Shirasawa

Toshiki Fukui

Shinji Kiuchi

Hiroshi Fujimoto

Yuichi Tanaka

Toshiaki Matsumura

A nuclear power plant control system including: a detection unit for detecting a specific event occurring in the nuclear power plant; an on-site equipment handling the event; and a majority decision judging device and an on-site equipment control device which constitute a plurality of control devices respectively operating independently. Each of the control devices includes a plurality of arithmetic units which perform arithmetic processes independently and in parallel based on a detection result of the detection unit, and output a signal for controlling the on-site equipment according to the results of operations of the arithmetic processes. The plurality of arithmetic units perform a matching process for harmonizing process statuses of the arithmetic processes of respective arithmetic units with each other when starting up the control devices, and after completing the matching process, respectively perform the arithmetic processes independently and in parallel.

Control device and nuclear power plant control system

A control system allows controlling a nuclear facility in an evacuation area. The control system includes a control device in ordinary use disposed in a non-evacuation area, an emergency control device&#x2014;for emergency in the evacuation area, a plant control facility connectable to the control device&#x2014;and the emergency control device, a signal switching unit that switches from a normal coupling to an emergency coupling based on an emergency switch signal, a first selector switch in the non-evacuation area, a second selector switch-in the evacuation area, an AND circuit configured to output the emergency switch signal to the signal switching unit in the case where the emergency switch signal is input from the first selector switch and the emergency switch signal is input from the second selector switch.

Control system for nuclear facility and control method for nuclear facility

A nuclear power plant control system () includes a control button () which receives an operation for controlling a control target device (), a notification lamp () which notifies that a control signal corresponding to the operation received by the control button () arrives at a predetermined position on a path connected from a control panel () to the control target device (), and a control signal inhibition unit () which inhibits a control signal from arriving at the control target device () in midstream between the predetermined position on the path and the control target device () in response to an operation received by a test permission button ().

Nuclear power plant control system and method of testing nuclear power plant

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.

Control system and method for nuclear power facility

A reactor shutdown system includes a reactor, a control-rod drive unit that can drive a control rod in pulling and inserting directions with respect to a fuel assembly, a power source that can supply power to the control-rod drive unit, and a power converter that is provided between the control-rod drive unit and the power source, in which when power supply is cut off, the control-rod drive unit inserts the control rod into the fuel assembly to stop nuclear reaction in the reactor, and the reactor shutdown system includes a reactor trip breaker provided between the power converter and the control-rod drive unit, a safety protection-system device that controls the reactor trip breaker to cut off power supply to the control-rod drive unit, and a CCF device that controls the power converter to cut off power supply to the control-rod drive unit.

Growing community of inventors

Tokyo, Japan

Yasutake Akizuki