ML20010E752

LER 81-126/01T-0:on 810810,Channel 1 of Engineered Safety Features Instrumentation for Refueling Water Storage Tank Level Failed.Caused by Drift Due to Faulty Transmitter,Model 386.Personnel Failed to Trip Channel.Transmitter Replaced

ML20010E752
Person / Time
Site:	McGuire
Issue date:	08/24/1981
From:	Nardoci P DUKE POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010E749	List: ML20010E747 ML20010E752
References
LER-81-126-01T, LER-81-126-1T, NUDOCS 8109080220
Download: ML20010E752 (1)

Text

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g 1 g 0, 8,1 0,8 92 g 4, 8,1 88 Gi OOCa&T ase.assen 48 80 3 Aft le 1 ee7CATGart .0 EVENT cESC3tmCN Ang p.CS Aetj cChs(CVENC33 iTTT"I f While in Mode 2, Channel 1 of the ngineered Safety Features (ESF) Instrumentag

,3,3;  ; tion for Refueling Water Storage Tank (FWST) level failed due to a faulty trans-ia2.. Imitter. The channel was not placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> as rq-

,3,,, g quired by T.S. 3.3.2 which is reportable per T.S.6.9.1.12(f). Since during the I t2i,1Itime of the incident there were no accidents or significant changes in FWST ,

,3,,, g level, in addition to availability of trip logic, the health and safety of the f

public were not affected.

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ti,o!IChannel 1 of the FWST level was drifting due to a faulty transmitter (Barton, ,

,, ,, , ;Model 386) - exact failure not determined. Personnel on duty at the time of

,, ,,,i failure were unfamiliar with the FW system logic, resulting in their failure toI

,,,,,g trip the channel within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. tie channel was placcd in the tripped condition, I i,..! tand the transmitter replaced. A method is being developed to prevent recurrence. I l 7 . s

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Phillip B. Nardoci (704) 373-7432 NauscfP9f%ApgM 8109080220 810824 PDR ADOCK 05000369 S PDR