Kabushiki Kaisha Toshiba

Yutaka Uruma

Seiji Yamamoto

Yumi Yaita

Hiroyuki Arai

Masato Okamura

Osamu Shibasaki

Minoru Kobayashi

Masami Enda

Hajime Hirasawa

Shuji Seki

Koji Negishi

Ichiro Inami

Yukio Hemmi

Hiromi Aoi

Takao Baba

Teruki Fukumatsu

Fumihiko Ishibashi

A photocatalyst injection system including: a reactor primary system coolant collection section collecting a reactor primary system coolant containing a noble metal or noble metal ion from a reactor primary system; a photocatalyst addition section adding a photocatalyst to the collected reactor primary system coolant; an ultraviolet irradiation section irradiating, with ultraviolet rays, the coolant to which the photocatalyst has been added for producing, in the coolant, a noble metal-carrying photocatalyst in which the noble metal is carried on a surface of the photocatalyst; and a noble metal-carrying photocatalyst injection section injecting the coolant containing the noble metal-carrying photocatalyst into the reactor primary system.

Photocatalyst injection method and photocatalyst injection system

A radioactive substance is effectively suppressed by an oxide-film removal step of removing an oxide film on a metallic material surface with which a coolant containing the radioactive substance comes in contact, and a titanium-oxide deposition step of depositing a titanium oxide on the metallic material surface after the oxide film has been removed.

Method of and system for suppressing deposition of radioactive substance

A radiation exposure reduction method includes the steps of: injecting iron into a coolant which flows from the reactor cooling system to the reactor core in a nuclear power plant; and ferritizing and fixing radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein an iron citrate which is soluble organic iron, or iron oxalate or iron fumarate which has a particle diameter of 3 &#x3bc;m or less, is used as the iron to be injected into the coolant.

Radiation exposure reduction method

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

Kawasaki, Japan

Yutaka Uruma