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Title:
MANUFACTURE OF MEMBERS FOR NUCLEAR POWER PLANT
Document Type and Number:
Japanese Patent JP2535114
Kind Code:
B2
Abstract:

PURPOSE: To restrain radioactive corrosion products from being increased in reactor water by heat-treating members under the decompression environment of a specified degree of vacuum after solution annealing has been given, and thereby giving age hardening treatment and oxide film formation treatment to the members.
CONSTITUTION: In manufacture of members for a nuclear reactor composed of Ni group precipitation consolidated type alloy, the members are heat-treated under the decompression environmental pressure of 10-3 to 102Torr after solution annealing has been given, and age hardening treatment and oxide film formation treatment are then given to the members. The reason why the decompression environmental pressure for heat-treatment is limited to 10-3 to 102Torr, coarse oxide articles will be produced over the surface of an oxide film if pressure is equal to or more than 102Torr, and the oxide film strong enough to restrain elution of Ni can not be formed if pressure is less than 10-3Torr. In addition, temperature for heat-treatment shall be ranged from 600°C to 730°C. This restraint thereby allows elution of Ni to a nuclear power plant to be lessened, and also allows 58Co, that is, radioactive corrosion products flowing to reactor water to be reduced accordingly, thereby making works easy at the time of periodic inspection and repairs, so that availability factor is thereby enhanced.


Inventors:
Fujiwara, Tetsuo
Tada, Kaoru
Application Number:
JP1991000329218
Publication Date:
September 18, 1996
Filing Date:
December 13, 1991
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
C22C19/05; C22F1/00; C22F1/10; C23C8/12; G21C21/00; (IPC1-7): G21C21/00; C22C19/05; C22F1/10; C23C8/12
Domestic Patent References:
JP336255A
JP361345A
Attorney, Agent or Firm:
則近 憲佑



 
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