ML20024F279

LER 83-066/03L-0:on 830817,invalid Alarm Received for Fire Detection Zone Efa 90 Which Would Not Clear.Caused by Unusual Svc Conditions.Detector Cleaned & replaced.W/830829 Ltr

ML20024F279
Person / Time
Site:	McGuire
Issue date:	08/29/1983
From:	Nardoci P, Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-066-03L, LER-83-66-3L, NUDOCS 8309090175
Download: ML20024F279 (2)

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uCL. A N R.GU L A.O R Y COMMIS.lO M M.dC.n.Omm n a. 3.. .Y sY.E. s.-e UCENSEE EVENT REPORT LPLEASE PRINT OR fYPE ALL REQUIREO INFORMATICN)

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EVENT oEsCRIPTION AND PRC8A8LE CONSEQUENCES l o i: j lWhile in Mode 5. on 8/17/83 and agnn on 8/18/83 an invalid alarm was received !

,o;) ifor fire detection zone EFA 90 which would not clear. The zone was declared in-

'O'4 !onerable both times ner T.S.3.3.3.7 which is renortable ner T.S.6.9.1.ll(b) and '

t o : s i lsimilar to RO's 369/83-40, 83-52, 83-64, and 370/83-13. 83-24. 83-30. Hourly firta i o i s l l watches were initiated as required by the T.S. action statements. Health and

' I IO!?'lsafety of the nublic were unaffected.

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CAusE oEsCRIPTION AND CORRECTIVE ACTIONS h

! i lo } lThese incidents are attributed to unusual service conditions: steam from the l l t ! i ! l waste evaporator feedtank subsystem is suspected to have caused the same detectolr lt!2ilto malfunction (due to high ambient temperatures in the area, any leakage from l l 1 ! 3 l Ithe pipins and valves contributes to the humidity problem). The detector (Fire-l

{t64ll mark 9620, ionization type) was cleaned (8/17) and subsequently replaced (8/18).l

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HALB.TUCKEH res.ernoxn N.[f

m. m..m August 29, 1983 8] gW am-4mn

. ~ ... - - g Ag. 5 5 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street NW, Suite 2900 Atlanta, Georgia 30303

Subject:

McGuire Nuclear Station Unit 1 Docket No. 50-369 LER/RO-369/83-66

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/83-66. This report

-concerns T.S. 3.3.3.7, "As a Minimum, the Fire Detection Instrumentation for Each Fire Detection Zone Shown in Table 3.3-11 Shall be Operable". This

-incident was considered to be of no significance with respect to the health and safety of the public.

Very truly yours, f8. f Hal B. Tucker lh

-PBN:jfw Attachment cc: Document Control Desk Mr. W. T. Orders U. S. Nuclear Regulatory Commission NRC Resident Inspector Washington, D. C. 20555 McGuire Nuclear Station Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 h

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