Title:
METHOD FOR MITIGATING STRESS CORROSION CRACKING OF STRUCTURAL MEMBER OF ATOMIC REACTOR PLANT
Document Type and Number:
WIPO Patent Application WO/2001/057879
Kind Code:
A1
Abstract:
A method for mitigating stress corrosion cracking of a structural member of an atomic reactor plant which comprises injecting a platinum compound, a rhodium compound and a palladium compound into the reactor water in a pressure vessel of an atomic reactor, in a manner such that palladium is present in the reactor water in a less mole number than those of platinum and rhodium. The injection of the above compounds is preferably carried out during the lowering of the temperature of the reactor water from 150°C to 80°C upon the shutdown of a BWR plant. The platinum, rhodium and palladium in the form of ions in the reactor water are deposited on the surface of a structural member of an atomic reactor plant, thereby to significantly reduce the ECP of the structural member.
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Inventors:
WADA YOICHI (JP)
TACHIBANA MASAHIKO (JP)
UETAKE NAOHITO (JP)
TACHIBANA MASAHIKO (JP)
UETAKE NAOHITO (JP)
Application Number:
PCT/JP2000/000563
Publication Date:
August 09, 2001
Filing Date:
February 02, 2000
Export Citation:
Assignee:
HITACHI LTD (JP)
WADA YOICHI (JP)
TACHIBANA MASAHIKO (JP)
UETAKE NAOHITO (JP)
WADA YOICHI (JP)
TACHIBANA MASAHIKO (JP)
UETAKE NAOHITO (JP)
International Classes:
G21C19/28; (IPC1-7): G21D1/00; G21D3/08
Foreign References:
| JPH10319181A | 1998-12-04 | |||
| JPH10186085A | 1998-07-14 | |||
| JPH11295480A | 1999-10-29 | |||
| JPH1184075A | 1999-03-26 | |||
| JPH10160892A | 1998-06-19 | |||
| JPH05209992A | 1993-08-20 | |||
| US5581588A | 1996-12-03 | |||
| US5448605A | 1995-09-05 |
Other References:
LUTZ D.R. ET AL.: "Influence of noble metal additions to water on corrosion of Zircaloy", PROC. 8TH. INT. SYMP. ENVIRON. DEGRAD. MATER. NUCL. POWER. SYST. WATER. REACT.,, vol. 2, 1997, pages 997 - 1004, XP002922587
KIM Y.J.: "Effect of Noble Metal Addition on Electrochemical Polarization Behavior of Hydrogen Oxidation and Oxygen Reduction on Type 304 Stainless Steel in High-Temperature Water", CORROSION,, vol. 55, no. 5, May 1999 (1999-05-01), pages 456 - 451, XP002922588
HETTIARACHCHI S. ET AL.: "Noble metal technique cuts corrosion and radiation", POWER ENG.,, vol. 102, no. 11, November 1998 (1998-11-01), pages 84, 86, 88, 90, 92, XP002922589
KIM Y.J.: "Effect of Noble Metal Addition on Electrochemical Polarization Behavior of Hydrogen Oxidation and Oxygen Reduction on Type 304 Stainless Steel in High-Temperature Water", CORROSION,, vol. 55, no. 5, May 1999 (1999-05-01), pages 456 - 451, XP002922588
HETTIARACHCHI S. ET AL.: "Noble metal technique cuts corrosion and radiation", POWER ENG.,, vol. 102, no. 11, November 1998 (1998-11-01), pages 84, 86, 88, 90, 92, XP002922589
Attorney, Agent or Firm:
Sakuta, Yasuo c/o Hitachi (Ltd. 5-1, Marunouchi 1-chome Chiyoda-ku Tokyo, JP)
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