05000369/LER-1981-126-01, /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

/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: 05000369/LER-1981-126, Forwards LER 81-126/01T-0.Detailed Event Analysis Encl 05000369/LER-1981-126-01, /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
References
LER-81-126-01T, LER-81-126-1T, NUDOCS 8109080220
Download: ML20010E752 (1)

LER-1981-126, /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

Event date:
Report date:
3691981126R01 - NRC Website

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.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

tion for Refueling Water Storage Tank (FWST) level failed due to a faulty trans-

,3,3; 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-ia2..

quired by T.S. 3.3.2 which is reportable per T.S.6.9.1.12(f). Since during the

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t2i,1Itime of the incident there were no accidents or significant changes in FWST level, in addition to availability of trip logic, the health and safety of the

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public were not affected.

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At.se casessmen ano c mmtenv 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 failure were unfamiliar with the FW system logic, resulting in their failure to

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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,

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tand the transmitter replaced. A method is being developed to prevent recurrence.

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