ML20235V279

Special Rept Spr 87-007:on 870630,noble Gas Effluent Monitor RMA-14 on Reactor Bldg Purge Supply & Exhaust Sys Declared Inoperable Due to Spurious Alarms.Caused by Failed Wire on Power Circuit Board.Wire Repaired & Monitor Returned to Svc

ML20235V279
Person / Time
Site:	Summer
Issue date:	07/13/1987
From:	Nauman D SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SPR-87-007, SPR-87-7, NUDOCS 8707230115
Download: ML20235V279 (2)

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g ggrojena Electric & Gas Company Dan Nuclear Operations g u g g 29218 SCE&G-4.c-%.y July 13, 1987 87 Jul. Is n 9: 34 Dr. J. Nelson Grace Regional Administrator '

U. S. Nuclear Regulatory Commission Region II, Suite 2900 101 Marietta Street, N.W.

Atlanta,. Georgia 30323

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Special Report (SPR 87-007)

Dear Dr. Grace:

Attached is a Special Report for the Virgil C. Summer Nuclear Station.

This report is submitted pursuant to the requirements of Technical Specification'3.3.3.1. Table 3.3-6, Action Statement 30, Item 2 and Technical Specification 6.9.2. '

Should there be any questions, please call us at your convenience.

ry truly rs,

,Na2 W%

n AMM: DAN /bjh Attachment pc: 0. W. Dixon, Jr./T. C. Nichols, Jr. J. C. Snelson E. C. Roberts G. O. Percival

0. S. Bradham R. L. Prevatte J. G. Connelly, Jr. J. B. Knotts, Jr.

O. R. Moore Marsh & McLennan W. A. Williams, Jr.. I&E Washington Group Managers Document Management W. R. Baehr Branch W. T. Frady INP0 Records Center C.'L.'Ligon (NSRC) ANI Library

.R. M. Campbell, Jr. NPCF K. E. Nodland File 8707230115 870713 P DR ADOCK O g5 6 47

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Dr. J. Nelson Grace SPR 87-007 July 13, 1987 ENCLOSURE 1 EVENT DESCRIPTION On June 24, 1987, RMA-14, the Noble Gas Effluent Monitor on the Reactor Building Purge Supply and Exhaust System, was declared inoperable due to the receipt of spurious alarms with no detectable radiation present.

ACTION TAKEN Technical Specifications Section 3.3.3.1, Table 3.3-6, Action Statement 30, Item 1 requires that with the number of operable channels less than the minimum number required, either restore the inoperable channel to operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or initiate a preplanned alternate method of monitoring.

On June 27, 1987, the inoperable channel was not yet returned to service so the preplanned alternate method of monitoring was initiated. The cause of the'inoperability was determined to be a failed wire on the main power circuit board.

The wire was repaired and the monitor was returned to service on July 6, 1987.

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