Hitachi, Ltd.

Kazuhiko Akamine

Katsumi Ohsumi

Yamato Asakura

Masanori Sakai

Makoto Nagase

Makoto Hayashi

Hideyuki Hosokawa

Yoichi Wada

Noriyuki Ohnaka

Yoshiyuki Takamori

Naohito Uetake

Masato Nakamura

Hidefumi Ibe

Yasuko Aoki

Takashi Saito

Kiyotomo Nakata

Masanori Takahashi

Masayoshi Kondoh

Kouichi Yamane

Teruo Hara

Surfaces of the structural components of a nuclear power plant exposed to reactor water are wetted with an electroless plating solution containing an electrical insulating substance. The electrical insulating substance has a high resistivity about 10 (100000) times those of the structural components of the nuclear power plant or above. A metal film containing the electrical insulating substance is formed on the surfaces of the structural components exposed to the reactor water by wetting the surfaces of the structural components with the electroless plating solution. Thus, the electrochemical corrosion potential of the structural components is reduced regardless of whether hydrogen is injected into the reactor water.

Treatment method of nuclear reactor internal component

In reactor water control for a BWR power plant during an operation cycle after loading new fuel rods in the BWR power plant, an operation is performed which accelerates deposition of crud on the fuel rods until the deposition amount of the crud on the fuel rods reaches a predetermined target value within the operation cycle concerned. After the deposition amount of the crud has reached the predetermined target value, the crud deposition accelerating operation is terminated, whereby even when loading new fuel rods such as Zr liner type fuel rods having a surface on which metal ion deposition has been difficult, radioactivity in the reactor water is efficiently reduced.

Reactor water control method in BWR power plant, BWR power plant having

A water chemistry factor which is specific to a specific portion of a primary cooling system and universal is decided to be a standard target. The concentration of an agent for mitigating corrosion damage of structural material of the primary cooling system is controlled so that the target will be in a desirable range. All sensor groups provided in the primary cooling system are separated into sensor groups in different lines, of which a specific sensor group are connected to an arithmetic unit and a data base and are for always monitoring a plant process. For example, concentration distribution agreed with measured value oxidation component in the reactor water at the measurement points is selected from the data base, and it is used to estimate the standard target.

Nuclear power plant having a water chemistry control system for a

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Katsuta, Japan

Kazuhiko Akamine