ML20024B776

LER 83-058/03L-0:on 830607,smoke Detector IXA-4993G Failed to Respond to Simulated Alarm.Caused by Broken Base Assembly in Detector Due to Open Circuit Preventing Alarm Condition. Component replaced.W/830706 Ltr

ML20024B776
Person / Time
Site:	Summer
Issue date:	07/06/1983
From:	Dixon O, Mckinney C SOUTH CAROLINA ELECTRIC & GAS CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-058-03L, LER-83-58-3L, NUDOCS 8307110370
Download: ML20024B776 (3)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Oto l a la l l0n June 7,1983, with the plant in M53e 1, Snoke Detector IXA-4993G l 9 jfailed to respond to a simulated alann condition. Zone XX (control l

,, g, ; l Building Elevation 463') was &clared inoperable at 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br /> ard an l

, ,, , l hourly fire watch was established. 'Ihere were no adverse consequences. l g o j, [ lThe roon containirs the inoperable detectors is nonnally occupied and l them is a high degree cf confidence that a fire in the area would have been detected prior to the discovery of the failure.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 j i j o l lThe cause of the inoperable cord vion was due to a broken base l l i l i l l assembly on the smoke detector. TM base assenbly had an open circuit l l i l 2 l lwhich prevented an alann cordition. 'Ihe conponent was replaced ard the l

, 3 l zone returned to operable cordition on June 10, 1983 No additional l

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Mr. James P. O'Reilly LER.No.83-058 Page Two July 6, 1983 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES On June 7, 1983, with the plant in Mode 1, Smoke Detector IXA-4993G failed to respond to a simulated alarm condition during the performance of surveillance testing. During additional attempts to initiate the alarm, the detectors became locked into a trouble condition and Zone XX (Control Building Elevation 463')

was subsequently declared inoperable at 1430 hours0.0166 days <br />0.397 hours <br />0.00236 weeks <br />5.44115e-4 months <br />. An hourly fire watch patrol was established within one (1) hour in accordance with Action Statement (a) of Technical Specification 3.3.3.7.

There were no adverse consequences resulting from this occurrence. The rooms containing the inoperable smoke detectors (reference Cause and Corrective Action) are adjacent to the Control Room and are normally occupied. Therefore, there is a high degree of confidence that a fire in the area would have been immediately detected and extinguished prior to the discovery of the zone's inoperable condition on June 7.

CAUSE AND CORRECTIVE ACTIONS The investigation performed by maintenance personral determined that Smoke Detector IXA-4993G was inoperable because of a broken base assembly. The base assembly had an open circuit which prevented an alarm condition from occurring on detectors IXA-4993G-L located in rooms 63-14, 15, 16, 17, 20 and 21. The exact time of failure cannot be established but apparently was between March 31 and June 7, 1983. The operability of the zone was verified on March 31, 198 3, during routine surveillance testing.

The base assembly was replaced and Zone XX returned to operable status at 0850-hours on June 10, 1983, after the completion of a satisfactory surveillance test. The licensee plans no additional action in reference to this occurrence.

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SOUTH CAROLINA ELECTRIC & GAS COMPANY,p POST OFFICE 764 CotuustA. SOUTH CAROLh O. W. DixoN, JR.

A9:5,w vice ens io.~, July 6, 1983 NucLean OpenArioNo Mr. James P. O'Reilly Regional Administrator i U.S. Nuclear Regulatory Commission Region II, Suite 2900 101 Marietta Street, N.W.

Atlanta, Georgia 30303

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Thirty Day Written Report LER 83-058

Dear Mr. O'Reilly:

Please find attached Licensee Event Report #83-058 for Virgil C.

-Summer Nuclear Station. This Thirty Day Report is required by Technical Specification 6.9.1.13.(b) as a result of entry into Action Statement (a) of Technical Specification 3.3.3.7, " Fire Protection Instrumentation," on June 7, 1983.

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

Very truly yours, O. . Dix 6 , Jr.

RJB:OWD/mac Attachment cc: V. C. ~ Summer C. L. Ligon (NSRC)

E. H. Crews, Jr. G. J. Braddick T. C. Nichols, Jr.,/O. W. Dixon, Jr. J. C. Miller E. C. Roberts J. L. Skolds H. N. Cyrus J. B. Knotts, Jr.

Group / General Managers I&E (Washington)

O. S. Bradham Document Management R. B. Clary Branch C. A. Price INPO Records Center A. R. Koon NPCF D. A. Lavigne File (Lic./Eng.)

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