Hitachi, Ltd.

Shigeru Udono

Koji Masui

Kazuhiko Ishii

Masahiro Matsuda

In a boiling water reactor controlling each control rod hydraulically by driving a solenoid valve, the control system comprises an operation control meanshaving a duplicated data processing unit for generating sequence patterns based on the timing of the driving sequence based on the control information provided manually, a transmission control meansfor creating a command word corresponding to each control rod being controlled based on said sequence pattern, and mutually communicating each command word between duplicated data processing units and computing the AND logic of said data within a predetermined time difference, and when the computed result coincide, transmitting the selected command word serially; a transmission unitfor receiving said command word and performing protocol conversion thereto, and transmitting the same to a plurality of transmission branch units positioned downstream as the control command; and a solenoid valve drive circuitfor driving the control rod drive unit corresponding to each rod branched from said transmission branch units.

Reactor manual control system

In a boiling water reactor controlling each control rod hydraulically by driving a solenoid valve, the control system comprises an operation control means having a duplicated data processing unit for generating sequence patterns based on the timing of the driving sequence based on the control information provided manually, a transmission control means for creating a command word corresponding to each control rod being controlled based on said sequence pattern, and mutually communicating each command word between duplicated data processing units and computing the AND logic of said data within a predetermined time difference, and when the computed result coincide, transmitting the selected command word serially; a transmission unit for receiving said command word and performing protocol conversion thereto, and transmitting the same to a plurality of transmission branch units positioned downstream as the control command; and a solenoid valve drive circuit for driving the control rod drive unit corresponding to each rod branched from said transmission branch units.

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Ibaraki, Japan

Shigeru Udono