PNO-IV-85-063, on 851206,reactor Inadvertently Tripped.Caused by Operator Incorrectly Initiating Steps of Surveillance Tests on Control Element Assembly Calculators.Cold Shutdown Planned to Replace Reactor Coolant Pump Seals

PNO-IV-85-063:on 851206,reactor Inadvertently Tripped.Caused by Operator Incorrectly Initiating Steps of Surveillance Tests on Control Element Assembly Calculators.Cold Shutdown Planned to Replace Reactor Coolant Pump Seals

ML20138J497
Person / Time
Site:	Waterford
Issue date:	12/10/1985
From:	Gagliardo J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
To:
References
PNO-IV-85-063, PNO-IV-85-63, NUDOCS 8512170537
Download: ML20138J497 (1)

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December 10, 1985-F ~ 7$ ' . -

' PRELIMINARY-NOTIFICATION dF EVENT OR UNUSUAL OCCURRENCE -- PNO-IV-85-63 lk y r .

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This' preliminary notification constitutes EARLY notice of events'of POSSIBLE e safety or public interest significance. The information is as initially received without1 verification or evaluation, and is basically all that is known

=by the Region IV staff on this date.

FACILITY:' e Licensee Emergency Classification: ,

Notification of Unusual Event Louisiana Power & Light Company.

>lWaterford 3 Alert Taft; Louisiana! Site Area Emergency Docket No. 50-382 _

General Emergency - '

. q- X Not Applicable 3

SUBJECT:

' INADVERTENT REACTOR TRIP FROM 100% POWER

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i Waterford '3 was tripped froin 100% power on December 6,1985, at 6:19 p.m. due to_ operator e' r ror. - The'~ operator caused the trip by incorrectly initiating the' 4 1 steps of_ surveillance tests on the control element assembly calculators and '

g> thus established the two of, four trip logic. The licensee has decided to

@ _ proceed,to cold shutdown to replace one or more reactor coolant pump seals and

.an RTD associated with the Core Protection Calculator. Shutdown is expected to

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E last 6 to 10idays, depending on the number of seals replaced. This PN is

> issued for information only and no further action is anticipated.

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Neither'the' licensee nor the-NRC plans to issue a press release.

The state of Louisiana-has been informed.

Region IV' received notification of this occurrence by telephone from the

~% ' resident inspector.at .9:00 a.m. , December 9,1985.

• p J.eE. Gagliardo, FTS 728-8141 9 . CONTACT:

-% DISTRIBUTION: ,

f1 AIL:

.$ H. St. Willste ADM:DMB (Original) q MNBB E/W

. Chairman Palladino E00 IE NMSS DOT:(Transonly)

N . Cone. Zech PA 01A RES

$- e Conn. Bernthal

.Com. Roberts ELD MPA AE0D-VIB FAX:

THF0 9 Com. Asselstine NSAC If ACRS Phillips RRI SECY NRR SP (Ai r M;s CA 3

DCS  : Rights) '

' ' LICENSEE:

J. PDR Regional Offices- (ReactorLicensee)

" RIV:DRSP RA h RDMartin EHJohnson/lk gt/p/85 j t / d/85

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. 8512170537 851210 PDR I&E -

P NO-IV-85-063 PDR 4