ML20024D810

LER 83-050/03L-0:on 830629,control Area Ventilation Sys Train B Declared Inoperable.Caused by Automatic Reset Preheater Overtemp Cutout Switch Failure.Replacement Switch Will Be installed.W/830729 Ltr

ML20024D810
Person / Time
Site:	McGuire
Issue date:	07/29/1983
From:	Nardoci P, Tucker H DUKE POWER CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-83-050-03L, LER-83-50-3L, NUDOCS 8308080245
Download: ML20024D810 (2)

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l o i: l l While in Mode 1. Control Area Ventilation System (VC) Trnin R was declared in- I ia ;) +l operable due to an automatic reset preheater overtemperature cutout switch fa114

' 3 t a ' l ure in outside air pressure filter Train B. This violates T.S.3.7.6 which in jo.sjjreportable per T.S.6.9.1.11(b). Constant filter package operation without pre- I l o i s j l heaters for the maximum time span since the last preheater operability test (1 !

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lXl9I9I9I ll]O CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h I'l0ll0ne of the 5 overtomnevnture cuenut muirchna (Diatemn model 106Y. Cat. 25020) I l i i i l l was open. having failed to reset (with the fans off. the beaters continued to I l i ! 2 l l radiate hent nnd mnv hnun ovcondnd the temo. setooint). The fnilnd cuenne nuired l l 2 l l was jumpered out, and the train declared operable. A replacement switch is beind lii4(!obtained and will be installed Further modifientinns n1nnnna includo an1ntinnI

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NAME OP P4EPARER Phillin B. Nnrdnci PwcNE: (704) 171-7417

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.a UStjQC f Ehh ,}MUKE POWER GOMI%NY A'TL.- ~ -- e.o. nox saiso CHARLOTTE, N.C. 28242 IIALH. TUCKER TELEPHONE T.I."lryg MG 3 A10 12 July 29, 1983 Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street NW, Suite 2900 Atlanta, Georgia 30303 Subj ect: McGuire Nuclear Station Units 1 and 2 Docket Nos. 50-369 and 50-370 LER/RO-369/83-50

Dear Mr. O'Reilly:

Please find attached Reportable Occurrence Report R0-369/83-50. This report concerns T.S. 3.7.6, "Two independent control area ventilation systems shall be operable". This incident was considered to be of no significance with respect to the health and safety of the public.

Note that this incident is similar to NRC Information Notice No. 83-25.

Very truly yours,

.8. /g Hal B. Tucker PBN:jfw Attachment cc: Document Control Desk Records Center U. S. Nuclear Regulatory Commission Institute of Nuclear Power Operations Washington, D. C. 20555 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 Mr. W. T. Orders NRC Resident Inspector McGuire Nuclear Station COW '.

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