ML17266A249

Updated LER 80-015/03L-1:on 800316,during Shutdown,Diesel Generator Loading Timers Found Out of Tolerance & Containment & Reactor Cavity Cooling Fans Failed to Start. Caused by Normal Setpoint Drift.Fans Retested

ML17266A249
Person / Time
Site:	Saint Lucie
Issue date:	07/24/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17208A925	List: ML17208A923 ML17266A249
References
LER-80-015-03L, LER-80-15-3L, NUDOCS 8008220232
Download: ML17266A249 (2)

Text

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REPORTA)3LE OCCURREN~35-80-15 '

LICENSEE EVENT REPOR~

PACE Tt<0 ADDITIONAL CAUSE DESCRIPTION AND CORRECTIVE ACTIONS The diesel generator loading sequence timers were out of tolerance by the following amounts: lA HPSI pump +0.18 sec, 1B HPSI pump +0.22 sec, 1A ICH pump +0.15 sec, 1A CS pump +0.60, 1B CS pump +0.8 sec., HVE-9A +0.86 sec, HVE-13B +0.30 sec., lB CVCS HT.Trace +1.00 sec, 1A battery charger +0.20 sec;, and HVS-4A +5.00 sec. Based on a review of previous engineered safety feature tests it appears that with the exception of HVS-4A (RAB vent.), the timers exhibited normally *expected minor setpoint drift.'he HVS-4A timer relay was replaced and the other relays were readjusted to specification.

All relays retested satisfactorily.

As'a result of continued evidence of undesirable timer drift, an engineering evaluation of the feasibility of a different and more repeatable timing circuit design is in progress. If significant design changes are made as a result of this evaluation, a follow-up report will be issued.

The reactor cavity cooling fan was retested for loss of power restart and functioned properly. he containment cooling fan was retested for loss of power restart and SIAS relay actuation and also functioned properly in both cases. No problems were found during fan trouble shooting.

f The SBVS valves were retested satisfactorily. It was 'determined the initial test, a shield building door had been opens for refueling that'uring access, thus preventing the valves from opening on shield building differential pressure.