ML20011D422

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Informs NRC That Qualified Life Based on Plant Location Different from That Presented at ASLB 860313 Hearing
ML20011D422
Person / Time
Site: Vogtle  Southern Nuclear icon.png
Issue date: 12/19/1989
From: Hairston W
GEORGIA POWER CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ELV-01065, ELV-1065, NUDOCS 8912270169
Download: ML20011D422 (2)


Text

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December 19, 1989 ,, m y, , ,, ,,,,

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W. G. Hairston, !Il sena vice erewent 0117 Nocear Opmattors Docket Nos. 50-424 50-425 U'. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555

. Gentlemen:

V0GTLE ELECTRIC GENERATING PLANT ASCO SOLENOID VALVES In the completed Vogtle operating licensing proceeding, the Atomic Safety and Licensing Board (ASLB) held hearings on March 13, 1986, to consider a contention concerning environmental qualification of ASCO solenoid valves. In Georgia Power Company's testimony, the ASCO solenoid valves, qualified by Test Report AQS-21678/TR, Revision A, were reported to have a 4 year qualified life. Other ASCO solenoid valves, which were qualified by Test Report AQR-67368, Revision 1, were reported to have a qualified life of 8 years. The testimony also provided a detailed discussion on the Planned Maintenance and Surveillance Program that required all safety-related ASCO solenoid valves to be replaced prior to

. expiration of their qualified life. The ASLB subsequently concluded that the safety-related application of ASCO solenoid valves had been acceptably qualified environmentally and that additional assurance of the adequacy was derived from the Planned Maintenance and Surveillance Program. The Board did not specifically address, nor did the contention directly relate to, the qualified life durations of the solenoid valves.

The qualified lives that were reported in the testimony were based on generic qualification data. The qualified life is based historically on calcu.ations utilizing _the Arrhenius methodology, which is a function of normal ambient temperature, activation energy, and aging data. The Arrhenius methooology is considered an acceptable method of addressing accelerated aging to establish replacement schedules as documented in NUREG-0588 and Generic Letter 8?-09.

The Vogtle Electric Generating Plant (VEGP) has completed a qualified life analysis on certain ASCO solenoid valves in harsh environments to establish locatinn specific qualified lives. The analysis included actual temperatures at plant specific locations and heat rise data from energized coils. Based on actual conditions at plant specific locations, the qualified ' life of certain installed ASCO solenoid valves may be greater or (less) than those reported in the testimony. The results of these analyses will be incorporated in the equipment qualification data packages and will also be reflected in the Planned Maintenance and Surveillance Program, While the qualified life of some ASCO solenoid valves was shortened, no installed plant equipment exceeded the new

. shortened lives.

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Chol la Power U. S. Nuclear Ragulatory Commission ELV-01065 Pace Two I

This letter is intended only to inform the NRC that the qualified life based on

)lant specific locations may be different from that presented at the ASLB 1 earing. All licensing commitments for VEGP are being fulfilled and will continue to be met relative to ASCO solenoid valves.

Sincerely, W.b .W 'Dr~

W. G. Hairston, 111 WGH,Ill/PAH/gm xc: GeorJia Power Company Mr. C. K. McCoy Mr. G. Bockhold, Jr.

.Mr. P. D. Rushton Mr. R. M. Odom NORMS U. S. Nuclear Reaulatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. J. B. Hopkins, Licensing Project Manager, NRR Mr.. J. F. Rogge, Senior Resident inspector, Vogtle I

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