Kabushiki Kaisha Toshiba

Tetsuji Kaneko

Minoru Kobayashi

Masato Okamura

Kenji Yamazaki

Seiji Yamamoto

Osamu Shibasaki

Hajime Hirasawa

Koji Negishi

Kunihiko Kinugasa

Akio Sayano

Toyoaki Miyazaki

Norihisa Saito

Yasuo Morishima

The present invention provides a corrosion-resistant structure for a high-temperature water system comprising: a structural material; and a corrosion-resistant filmformed from a substance containing at least one of La and Y deposited on a surface in a side that comes in contact with a cooling water, of the structural materialwhich constitutes the high-temperature water system that passes a cooling waterof high temperature therein. Due to above construction, there can be provided the corrosion-resistant structure and a corrosion-preventing method capable of operating a plant without conducting a water chemistry control of cooling water by injecting chemicals.

Corrosion-resistant structure for high-temperature water system and corrosion-preventing method thereof

A coating of niobium oxide, zirconium titanate, or nickel titanate is formed on at least a part of a surface of a jet pump member constituting a jet pump serving as a reactor internal structure of a boiling water reactor. Further, a solution containing, e.g., a niobium compound is applied to at least a part of the surface of the jet pump member constituting the jet pump, and the jet pump member coated with the solution is heat-treated to form a coating of, e.g., niobium oxide. With this configuration, the jet pump member constituting the jet pump of the boiling water reactor is provided such that deposition of crud can be sufficiently suppressed on the jet pump member.

Reactor internal structure and method of manufacturing the same

The present invention provides an operation method of a plant which has a low-pressure feed water heater, a deaerator and a high-pressure feed water heater sequentially arranged in a feed water pipe reaching a steam generator from a condenser, and leads high-temperature feed water to the steam generator, wherein an oxidant is injected onto a surface of a structural material from an oxidant injection line in order to form a film that suppresses an elution of an element constituting the structural material such as the feed water pipe, the low-pressure feed water heater, the deaerator and the high-pressure feed water heater, which come in contact with the high-temperature feed water, and a corrosion suppression substance is further introduced from a corrosion suppression substance introduction line in order to deposit the corrosion suppression substance on a surface of the structural material in which corrosion accelerated by a flow of the feed water occurs.

Plant operation method and plant operation system

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Yokohama, Japan

Tetsuji Kaneko