ML20057D519

Revises Completion Date for Commitment Made in 930527 Response to EA 93-054 Re Failure of 30 Inch BIF Butterfly Valves Used as NSW Pump Discharge Valves to Open from 931001 to 940127

ML20057D519
Person / Time
Site:	Catawba
Issue date:	09/28/1993
From:	Rehn D DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
EA-93-054, EA-93-54, NUDOCS 9310040299
Download: ML20057D519 (2)

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, . , 11 'I Dut?e Power Company DLRm Carcuba Nu;leur Gem ration Depanment 1 ce President i i M Canard Road (803M313205 Omce ,

liA SC29'45 (803)R313C6 Fat i

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. DUKEPOWER September 28, 1993 l U. S. Nuclear Regulatory Commission ,.;

ATTN: Document Control Desk Fi Washington, D. C. 20555

Subject:

Catawba Nuclear Station Dockets Nos. 50-413 and 50-414 Commitment Date Extension Enforcement Action 93-054 In Duke Power Company's response to Enforcement Action 93-054, dated May 27, 1993, concerning the failure of the 30 i.nch '

Basic-In-Flow (BIF) butterfly valves use as nuclear service water pump discharge valves to open, it was stated that -

additional testing of the removed valve would be done to attempt to identify the root cause of the higher than normal torque requirements. The original completion date for this commitment was October 1, 1993.

r To date, the test plan has been developed, strain gages have '

been installed and calibrated, baseline running loads have been obtained, test fixture designed, and fixture fabrication has begun. Outstanding actions necessary to complete this commitment include completion of fixture machining, assembly of test fixture, preparation of data acquisition system, testing, and analysis of res* *s.  ;

Due to the valve si: ,! geometry, 30 inch butterfly, and the high loads involved (7a,000 lbs.), the test fixture design and f abrication has become more complex than initially anticipated.

Also, the upcoming outage will impact the availability of test i facilities, equipment and manpower.

Likewise, we are revising the completion date for this commitment. The testing and data analysis will be completed by January 27, 1994.

Very truly yours, D. L. Rehn 0th000 J 9310040299 930928 PDR ADOCK 05000413 G

~ . _ _

PDR f 60l, i

U. -S. Nuclear Regulatory Commission '

. September 28, 1993 -

Page 2  ;

i xc: S. D. Ebneter, Region II  !

t R. E. Martin, ONRR- i R. J. Freudenberger, CNS Senior Resident j l

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