Kabushiki Kaisha Toshiba

Ichiro Inami

Yumi Yaita

Masami Enda

Hitoshi Sakai

Takeshi Kanasaki

Mitsuyoshi Sato

Toshihiro Yoshii

Minoru Kobayashi

Nagayoshi Ichikawa

Shuji Seki

Masayuki Kaneda

Norihisa Saito

Yutaka Uruma

Yukio Hemmi

Hiromi Aoi

Yoshinari Takamatsu

Satoshi Hiraragi

Fumihiko Ishibashi

Takao Baba

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

A system for chemically decontaminating radioactive material.

System and method for chemical decontamination of radioactive material

Chemical decontamination method of dissolving oxide film adhered to contaminated component including, preparing decontamination solution in which ozone is dissolved and oxidation additive agent, which suppresses corrosion of metal base of the contaminated component, is added, and applying the decontamination solution to the contaminated component, thereby to remove the oxide film by oxidation.

Method for treating a chemical decontamination solution

A method for chemically decontaminating radioactive material. The method includes reducing-dissolving step for setting surface of radioactive material in contact with reducing decontamination liquid including mono-carboxylic acid and di-carboxylic acid as dissolvent; and oxidizing-dissolving step for setting the surface of the radioactive material in contact with oxidizing decontamination liquid including oxidizer. The method may include repeated pairs of steps, each pair including the reducing-dissolving step and the oxidizing-dissolving step. The mono-carboxylic acid may include formic acid, and the di-carboxylic acid includes oxalic acid. The oxidizer may be ozone, permanganic acid or permanganate.

Migration of radioactive materials from a pressure vessel to a steam system in a nuclear power plant is suppressed by using a dryer () provided with corrugated plates () having surfaces coated with an inorganic ion-exchange material stable under a condition in which high-temperature water exist, such as TiO.

Nuclear power plant system and method of operating the same

Growing community of inventors

Tokyo, Japan

Ichiro Inami