ML20049A335

RO 80-078/01P:on 801114 It Was Discovered That Code Safety Valves Challenged W/Water Loop Seal on Inlets Would Result in Overstress of Pressurizer Safety & Power Operated Relief Valve Piping.Drainage of Seals Would Prevent Condition

ML20049A335
Person / Time
Site:	Beaver Valley
Issue date:	11/17/1980
From:	Werling J DUQUESNE LIGHT CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
BVPS:JAW:1024, RO-80-078-01P, RO-80-78-1P, NUDOCS 8011240273
Download: ML20049A335 (3)

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November 17,1980 BYFS JAW:1024

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I Besser Yalley faser Station, Unit No. 1 l Becket so. 50-334, License No. DPR-66 L R 80-078/01P 4

ur. 3. s. seier. Director of Rasention noitad stata m e h ar leselatory commission

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Dear Mr. crier:

1 In accordamse with Appendix A leaver Ys11ey Technical Specifications, Licensee Event Report la 80-078/01P, Technie'ai specifica: ion 6.9.1.8.1, Analysis of Structores, is submitted. Bis occurrence was reported to the stFS BC 3asident Inspector, Mr. D. A. Becksso, at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br /> on November 14, IM In the event that the Cada safety valws are challenged with a unter loop seal sa the falets, the pressuriser safety sad powr-operated relief v 1w piping c

so 14 be overstressed. A long-ters analytical sointion was required to resolw this probles. Analysis determined that these conditions voeld not exist if the i

De islets to the Code safeties and powr-operated lasp seals wre drained.

relief val m s have been provided with continuous drains until the final analysis p is essplate and modiff* cations are designed.  ;

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Further analysis has been used to determine that operation of the Fever - '

i operated relief valves, with a v6ter sul, will act result la an ontstressed 1 esadities. A loop seal vill be reestablished for these valms on the first scheduled statica outage of suffielent duration to complete the task.

Analysis is costissing on undifications required to reestablish loop seals as the Code safety valves.

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Very truly yours, J. A. Werling Superintendent est Mrector of Managesset & Program Analysis hited States seclasr Regulatory Commissica

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V.J.Ross,BTFS!.ieansingProjectManager 9mited States Noelaar Regulatory Commission .

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. 3. A. Esdams, a-faar lessistory comisslos, BTFS site Inspector

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F. Eigsfas, Secretary, Prins Nevers Committee .III metaae Safety Analysis Canter, Falo Alto,, California l .. oford, ei mue muu. ..< , i.ra r., rA .

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NAME OF PREPARER PHON E: