ML20042E420

Special Rept Spr 90-001:on 900322,main Plant vent,high-range Radiation Monitor Began to Alarm Spuriously,Declared Inoperable & Removed from Svc.Caused by Failed Readout Module.Alarm Repaired & Returned to Svc on 900402

ML20042E420
Person / Time
Site:	Summer
Issue date:	04/05/1990
From:	Bradham O SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Ebneter S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SPR-90-001, SPR-90-1, NUDOCS 9004200757
Download: ML20042E420 (1)

Text

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SCE&G s unw,h April 5, 1990 qq Gi'\ \0 Mr. S. D. Ebneter "

Regional Administrator U. S. Nuclear Regulatory Commission t

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 90-001)

Dear Mr. Ebneter:

This Special Report is being submitted per Technical Specifications, Section 6.9.2, due to Action 30 of " Radiation Monitoring Instrumentation,"

Specification 3.3.3.1 Table 3.3-6, Item d(i).

On March 22, 1990, the main plant vent, high range, radiation monitor (RM-A13) began to alarm spuriously. RM-A13 was declared inoperable and was removed from service at 1150 hours0.0133 days <br />0.319 hours <br />0.0019 weeks <br />4.37575e-4 months <br />.

Action 30 of Specification 3.3.3.1 allows RM-A13 to be inoperable for up to I

72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> before requiring a preplanned alternate method of monitoring to be

implemented. The alternate method of monitoring was initiated at 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br /> l on March 25. It is important to note that Specification 3.3.3.1 is not applicable in Mode 5 and the plant entered Mode 5 at 2235 hours0.0259 days <br />0.621 hours <br />0.0037 weeks <br />8.504175e-4 months <br /> on March 25 l to enter the fifth refueling outage.

A Maintenance Work Request (MWR) that was initiated to troubleshoot and repair RM-A13 discovered a failed readout m( Ole as the cause for the spurious alarms. RM-A13 was repaired and returned to service on April 2.

Should you have any questions, please call at your convenience.

Very truly yours, 9004200757 900405 PDR ADOCK0500g5 S nyhc1b urr~

0. S. Bradham DCH/OSB: led c: D. A. Nauman/0. W. Dixon, Jr./T. C. Nichols, Jr.

E. C. Roberts R. V. Tanner R. L. Prevatte General Managers Marsh & McLe3 nan J. J. Hayes, Jr. Document Management Branch C. A. Price INPO Records Center l R. B. Clary ANI Library 1

J. R. Proper NSRC K. E. Nodland NPCF J. C. Snelson RTS (ONO900028) -/ f l- J. B. Knotts, Jr.

File (818.05&818.08) [g

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