ML20217A020

PNO-78-169:on 780916,failure of Solenoid Coil in Unit 1 Main Steam Stop Valve 1A Resulted in Closure of Valve & Trip of Unit 1

ML20217A020
Person / Time
Site:	Arkansas Nuclear
Issue date:	09/19/1978
From:	Klingler G, Nolan F, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-78-169, NUDOCS 9804220128
Download: ML20217A020 (1)

Text

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PRELIMINARY NOTIFICATION

[Q d D. n f September 19, 1978 1

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( l PRELIf11 NARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-78-169 This preliminary notification constitutes EARLY notice of an event of

'l POSSIBLE safety or public interest significance. TTie information  !

presented is as initially received without verification or evaluation and is basically all that is known by IE staff on this date.

FACILITY: Arkansas Power arid Light Company Arkansas Nuclear One, Units Nos. 1 and 2 (Docket'Nos. 50313 and 50368) .

SUBJECT:

INADVERTENT INITIATION OF UNIT 2 EMERGENCY SAFETY FEATURE SYSTEMS The failure of a solenoid coil in the Unit No.1 Main Steam Stop' Valve 1A resulted in closure of the valve and a trip of Unit No. 1 Reactor at about 1 1:19 p.m., CST, September 16, 1978. The sequence of events which followed led to the inadvertent initiation of the Unit 2 Engineered Safety Features Systems and subsequent spray down of the Unit No. 2 Containment with 50,000 gallons of borated water from the Containment Spray System. Unit.

No.1 was at 100% power and Unit No. 2 was in hotstandby (540 F) with post core hot functional testing in progress at the time of the event.

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The Safety Injection Systems did not inject any borated water into the 1 [ primary coolant systemsince the primary system was at a higher pressure.

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Fifty thousand gallons of borated water was sprayed into the Unit No. 2 containment by the containment Spray System. There was no release of '.

l radioactivity.

j Unit No. 1 has been returned to power (100%) and Unit No. 2 is in cold l

' shut down. The licensee is reviewing the consequences of aaving intro-duced 50,000 gallons of borated water into the containment.

The licensee and Region IV do not plan to issue a press release.

Region IV received notification of this occurrence by telephone at 9:30 l a.m. CST from the Acting Plant Manager of Arkansas Nuclear One.

Co_ntact: GKlingler, IE x28019 FNolan, IE x28019 JSniezik, IE x28019 -

,8 Distribution: Transmitted H St 10 M

-A Chairman.,Hendrie Commissioner Bradford S. J. Chilk, SECY

$ Co:raissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA R Cc.umissioner Gilinsky (ForDistribution)

$$ 1ransmitted: MMBB N h P Bldg f hI b J. G. Da/i I 87 L. V. Gossick, ED0' H. R. Denton, NRR RegionMh I 7R S. H. Hanauer, EDO y J. J. Fouchard, PA H. '!. Haller, MPA SS Bldg /06@ (MAIL)  !

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"" R. G. Ryan, OSP - i , ' J-C V. Smith, NMSS 0. G. Abston, 01A -

R. Minogue, SD C I H. K. Shapar, ELD .

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PRELIMINARY MOTIFICATION pt' 0