ML20203N872

PND-V-86-024:on 860428,ESF Load Sequencer for Emergency Diesel Generator Train a Automatically Started When QA Inspector Jiggled Wire in Load Sequencer Cabinet.Emergency Diesel B Being Tested Every 8 H

ML20203N872
Person / Time
Site:	Palo Verde
Issue date:	04/29/1986
From:	Miller L, Zimmerman R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-86-024, PNO-V-86-24, NUDOCS 8605060167
Download: ML20203N872 (1)

Text

PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-86-24 Date: 04/29/86 This preliminary notification constitutes EARLY notice nf events of POSSIBLE safety or public l interest significance. The information presented is as initially received without verification er evaluation and is basically all that is known by Region V staff on this date.

FACILITY: -Arizona Nuclear Power Project Energency Classification Palo Verde Unit 2 Notification of Unusual Event DOCKET NO. 50-529 Alert Site Area Emergency General Emergency X Not Applicable

SUBJECT:

EMERGENCY DIESEL GENERATOR TRAIN 'A' LOAD SEQUENCER MALFUNCTION On April 28, 1986,-at 11:29 p.m. (MST), the engineered safety features load sequencer for the Train 'A' Emergency Diesel Generator (EDG) automatically started the Train 'A' EDG when a quality assurance inspector apparently jiggled a wire in the load sequencer cabinet. The load sequencer did not complete the design load sequence for the existing offsite power avsilable condition.

Esasntial control room ventilation did not start because the sequencer locked up in the process of going through its sequence. Also, battery chargers "A" and "C" tripped off and wsra not restarted due to the sequencer failure.

c "B" emergency diesel is being tested every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and the unit is in a 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> action statement. Engineering personnel have been called in to evaluate the problem.

'Ihis information is current as of 9:00 am, PDT, on April 29, 1986.

CONTACT: R. Zimmerman, L. Miller (602) 386-5760 (415) 943-3869 j "I "

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CA (Reactor Licensees) REGION V: FORM 211 PDR Resident Inspector _ (Revised 3/14/83) r

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