Chien J Lin

US Patent:

53751523, Dec 20, 1994

Filed:

Jul 6, 1993

Appl. No.:

8/087560

Inventors:

Chien C. Lin - Fremont CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 1900

US Classification:

376310

Abstract:

A method for preventing or reducing the formation of Co-60 contaminated material on the surfaces of a cooling water circuit of a nuclear reactor. The method is carried out during shutdown of the reactor. First, Co-60 contaminated material formed on the surfaces of the cooling water circuit is chemically removed. Then at least one iron compound is added to the cooling water in an amount sufficient to scavenge cobalt from the cooling water. Thereafter, oxygen is injected into the cooling water to provide a dissolved oxygen concentration sufficient to form an oxide film on the surfaces of the cooling water circuit. The oxide film so formed is substantially free of Co-60 isotope. This treatment reduces the radiation hazard to nuclear reactor personnel.

US Patent:

52456420, Sep 14, 1993

Filed:

Oct 31, 1991

Appl. No.:

7/785649

Inventors:

Chien C. Lin - Fremont CA

Assignee:

General Electric Company - San Jose CA

International Classification:

G21C 1900

US Classification:

376310

Abstract:

A method for chemically controlling cobalt decontaminating the water cooling system of a water cooled nuclear fission reactor to reduce the radiation hazard to personnel.