Title:
構造材からのニッケル及びコバルトの溶出抑制方法
Document Type and Number:
Japanese Patent JP4944542
Kind Code:
B2
Abstract:
A nuclear reactor structural material (for example, a spacer spring) is immersed in purified water in a treatment bath. The temperature of the purified water increased to 90° C. by a heater. Iron formate (a solution containing iron (II) ions) in an iron formate tank, hydrogen peroxide in a hydrogen peroxide tank, and hydrazine in a hydrazine tank are injected into a pipe and are guided into the treatment bath. The injection of iron formate is performed until the concentration of iron (II) ions in the purified water becomes 200 ppm or more. By injecting hydrazine, pH is adjusted in a range of from 5.5 to 9.0. A portion of a magnetite film thus formed on the structural material is then removed, e.g., by applying ultrasonic waves. With this process, a fine strong magnetite film for suppressing the elution of cobalt from the nuclear reactor structural material is formed on the surface of the nuclear reactor structural material.
Inventors:
Makoto Nagase
Hideyuki Hosokawa
Issei Ishida
Satoshi Morisawa
Motoaki Sakashita
Aizawa Motohiro
Hideyuki Hosokawa
Issei Ishida
Satoshi Morisawa
Motoaki Sakashita
Aizawa Motohiro
Application Number:
JP2006225331A
Publication Date:
June 06, 2012
Filing Date:
August 22, 2006
Export Citation:
Assignee:
Hitachi ge Nuclear Energy Co., Ltd.
International Classes:
G21D1/00; G21C3/34; G21C5/00; G21C7/10; G21F9/00
Domestic Patent References:
| JP2006038483A | ||||
| JP2005265449A | ||||
| JP2006038811A | ||||
| JP8226992A |
Attorney, Agent or Firm:
Polaire Patent Business Corporation