ML20042A776

LER 82-003/03L-0:on 820212,prior to Fuel Load,Operators Received Vital Instrument Ac Panel Under Voltage Alarm in Control Room.Caused by Tripped Feeder Breaker to PY-15. Event Under Investigation

ML20042A776
Person / Time
Site:	Diablo Canyon
Issue date:	03/15/1982
From:	Kaefer W PACIFIC GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20042A773	List: ML20042A772 ML20042A776
References
LER-82-003-03L, LER-82-3-3L, NUDOCS 8203240028
Download: ML20042A776 (2)

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n ai o.1..v. n Evf NT DESCRIPTION AND PAO. A.LE CoNSE OVENCES h o I Prior to fuel load, the operators received a vital instrument AC panel i o iundervoltage alarm in 'the control room. An operator was dispatched to i e i

. l nvestigate the source of the undervoltage alarm. When the feeder breakers s i to inverter IY-ll was manually switched off to check for a triopedtreakera o ,, sinverter IY-11 tripped. The operator immediately placed panel PY-ll on 3 o , i back-uo power and proceded to check the remainder of the breakers and ,

,en,idiscovered the fedder breaker to PY-15 in the (continued on attached page)

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CAusE DESCRIPTeoN AND CORREC fibt ACTIONS E I The cause of the event is still being investigated, i EE) I '

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ATTACHMENT TO LER 82-003/03L-0 Item 10, Event Description and Probable Consequences - continued tripped condition. PY-15 was placed on back-up power. The breaker was reset and PY-15 was placed back on normal power. From 1137 hours0.0132 days <br />0.316 hours <br />0.00188 weeks <br />4.326285e-4 months <br />, when inverter IY-11 tripped until 1610 bcurs, both channels of the Plant Vent Radiation Monitor (RM 14 A & B) were inoperable because the sample pumps do not restart when power to the monitor is restored. Furthermore, from 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br />, when it is suspected that PY-15 tripped until 1210 hours0.014 days <br />0.336 hours <br />0.002 weeks <br />4.60405e-4 months <br /> when power to the panel was restored, tne Plant Vent Iodine Monitor (RM-24) and the Plant Vent Flow Recorder (FR-12) were inoperable.

Technical Specification 3.3.3.10 requires at least one channel of each monitor and flow recorder be operable at all times. The appropriate Technical Specification Action Statements were entered and satisfied.

Since the plant has not attained criticality, no release of radioactive effluents occurred. This event in no way affects public health and safety. Reportable per Technical Specification 6.9.1.13.b.

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