Hitachi, Ltd.

Hiroyuki Masuda

Hideo Nakamura

Kouki Noguchi

Tadahiko Nishimukai

Yoshimune Hagiwara

Haruo Koizumi

Masahisa Ohashi

Shigehiro Kamejima

Minoru Ishii

A microprocessor chip including a ROM portion for storing a microprogram, an execution unit portion for executing an arithmetic operation and random logic circuits disposed between the ROM portion and the execution unit portion. Two-level metal lines technology is used for supplying power for grounding and for providing input/output interconnect lines for the random logic circuits.

Microprocessor chip using two-level metal lines technology

An operation control method for a nuclear reactor performing a load follow-up operation in accordance with a load variation program, wherein a core reactivity which changes with time in a first cycle of operation is predicted based on the load variation program and data for analyzing dynamic characteristics of the reactor, and a change in a liquid poison concentration in the first cycle of operation is obtained based on the predicted reactivity, and reactor power is controlled in the first cycle of operation by adjusting the liquid poison concentration in accordance with the obtained change. When the liquid poison concentration is adjusted and control rods are manipulated, a reactivity introduced by these operations in the first cycle of operation is obtained, and an adjustment to be made to the liquid poison concentration in the second cycle of operation which is the next cycle of operation following the first cycle of operation is obtained from the reactivity introduced in the first cycle of operation. When the change in reactivity in the second cycle of operation becomes equal to that in the first cycle of operation, and reactor power is controlled in the second cycle of operation by performing the obtained adjustment of the liquid poison concentration.

Operation control method for nuclear reactor

Growing community of inventors

Fuchu, Japan

Hiroyuki Masuda