Kabushiki Kaisha Toshiba

The Tokyo Electric Power Company, Incorporated

Ishikawajima-harima Heavy Industries Co., Ltd.

Nagayoshi Ichikawa

Kenji Yamazaki

Junichi Takagi

Tetsuo Oosato

Seiji Yamamoto

Masato Okamura

Shunichi Suzuki

Tadasu Yotsuyanagi

Kenro Takamori

Junichi Suzuki

Hidehiro Urata

Yuichi Fukaya

Mitsuru Sambongi

Takashi Hirano

Yukio Hemmi

Takeshi Shibano

Makoto Ueda

Toshihiro Yoshii

Yumi Yaita

Masami Enda

Masato Takahashi

Satoko Tajima

Ichiro Inami

Masayuki Kaneda

Takeshi Kanasaki

Kazuo Murakami

Shinichi Ishizato

Yukio Henmi

Takasi Hirano

In a method of reducing corrosion of a material constituting a nuclear reactor structure, an electrochemical corrosion potential is controlled by injecting a solution or a suspension containing a substance generating an excitation current by an action of at least one of radiation, light, and heat existing in a nuclear reactor, or a metal or a metallic compound forming the substance generating the excitation current under the condition in the nuclear reactor to allow the substance generating the excitation current to adhere to the surface of the nuclear reactor structural material, and by injecting hydrogen in cooling water of the nuclear reactor while controlling the hydrogen concentration in a feed water.

Method of reducing corrosion of nuclear reactor structural material

In a nuclear power plant, a corrosion-resistant oxide film on a surface of the metal component of a reactor structure is exposed to a high-temperature water, the corrosion-resistant oxide film containing an oxide having a property of a P-type semiconductor, and a catalytic substance having a property of an N-type semiconductor is deposited on the oxide film. The oxide film maintains the property of the P-type semiconductor.

Nuclear power plant, method of forming corrosion-resistant coating therefor, and method of operating nuclear power plant

A chemical decontamination apparatus of the present invention chemically dissolves radioactive substance-containing oxide films formed or adhering on the surface of a decontamination object by using ozone water to conduct decontamination. The chemical decontamination apparatus includes an ozone generating unit for generating ozone gas, an ozone supplying device for supplying the generated ozone gas to an ozone supplying unit in water, and a sintered metal elementwhich is disposed in the ozone supplying unit and to which ozone gas is supplied from the ozone supplying device. The ozone gas supplied to a sintered metal element interior from the ozone supplying device is allowed to flow out of the element into water so as to generate ozone water.

Chemical decontamination apparatus and decontamination method therein

In a method of reducing corrosion of a metal material, a substance such as semiconductor for generating an electric current by thermal excitation is coated or adhered on a metal material surface, to be exposed to a water having a high temperature of 150&#xb0; C. or more, of a boiler and ducts or pipes, to which hot water heated by the boiler contacts, of a thermal electric power plant or a nuclear reactor structural material or ducts or pipes surrounding the reactor in a nuclear power plant.

Method of reducing corrosion of metal material

A photocatalytic substance having the properties of an n-type semiconductor is deposited on a surface of a metal base made of a stainless steel or Inconel. When necessary, the hydrogen concentration of the reactor water is increased. A current produced by the photocatalytic substance when the same is irradiated with light or radioactive rays in a nuclear reactor flows through the metal base to reduce corrosion current. When necessary, the photocatalytic substance is provided on its surface with at least one of Pt, Rh, Ru and Pd.

Reactor structural member and method of suppressing corrosion of the same

There is provided a reactor control rod which is capable of suppressing an excessive frictional force acting on passive state oxide films formed on the surfaces of neutron absorber elements, and also reducing the possibility to cause electrochemical problems, and a method of manufacturing the same. The reactor control rod comprises a wing having a sheath which has a substantially U-shaped cross-section. A top end structure is secured to a longitudinal top end of the sheath. A bottom end structure is secured to a longitudinal bottom end of the sheath. An opening portion of the sheath is secured to a central structure. A neutron absorber element is made of neutron absorbing material. The neutron absorber element is charged in the sheath. A supporting rod through hole is formed in the neutron absorber element, so as to penetrate the neutron absorber element. A supporting rod fitting hole is formed in the sheath. A load supporting rod is inserted into the supporting rod through hole. The load supporting rod has a top end portion and a main body portion. The top end portion is inserted into the supporting rod fitting hole, so as to support the weight of the neutron absorber element by the sheath via the load supporting rod. The main body portion has a diameter lager than that of the top end portion. A step is formed by a difference in diameters between the top end portion and the main body portion, so as to create a minute clearance between the sheath and the neutron absorber element.

Reactor control rod and method of manufacturing the same

Growing community of inventors

Kawasaki, Japan

Nagayoshi Ichikawa