ML20248H861

PNO-78-102:on 780504,while RCS Was Open to Atmosphere, 50,000 Gallons of Reactor Coolant Overflowed Onto Containment Building Floor.Licensee Reported No Release of Radioactivity.State of South Carolina Notified

ML20248H861
Person / Time
Site:	Oconee
Issue date:	05/05/1978
From:	Blackwood E, Sniezek J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-78-102, NUDOCS 9806080280
Download: ML20248H861 (2)

Text

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- p(n Adaancs Ltocm Pw PRELIMINARY NOTIFICATION [ Q 4[jg h May 5, 1978  !

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% '> PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-78-102 This preliminary notification constitutes EARLY notice of an event .

of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by IE staff as of this date.

l FACILITY: Duke Power Company Oconee, Unit No.1 Docket Number 50-269

.. Oconee County, South Carolina

SUBJECT:

50,000 GALLONS OF PRIMARY WATER IN CONTAINMENT .

On May 4 between 11:30 a.m. and 2:00 p.m., while the reactor coolant system (RCS) was open to atmosphere, 50,000 gallons of reactor coolant overflowed onto the containment building floor.

The reactor has been shut down since April 21 due to a steam generator ,

tubeleak(PNO-78-90). The reactor coolant system (RCS)'was partially '

drained to permit draining the once-through-steam-generators (OTSG) for .

tube plugging. Steam generator manways had been previously removed. fG The RCS temperature was being controlled at 70 degrees F by recirculating  :

( through the low pressure injection system (LIPS), a normal path for j

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decay heat removal. The single suction valve from the RCS system to the i LPI pumps was shut during surveillance test and could not be fully  !

reopened causing a loss of normal decay heat removal capability at 11:30 a.m. 50,000 gallons of water from the borated water storage tank were injected into the RCS for decay heat removal. The injected water overflowed. out the open manways. At 2:00 p.m. the valve was reopened and normal decay heat removal was reestablished. The RCS water temperature reached a maximum of 215 degrees.

The licensee reported that there has been no release of radioactivity to l the environment and that no contamination of personnel occurred. The l

spilled water is being pumped from the containment to waste hold-up l tanks.

Media interest has not occurred. A news release is planned by the licensee. The NRC does not plan to issue a news release. The State of South Carolina has been notified. IE inspectors are at the site to review.this matter.

CONTINUED h /

9906000200 780505

PDR I&E PNO-78-102 PDR c-

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[i j Page 2 Continued PNO-78-102 May 5, 1978 l .

Region II (Atlanta) received notification of this occurrence by tele-phone from the licensee at 5:30 p.m. on May 4. This information is current as of 10:00 a.m. on May 5.

Contact:

EBBlackwood, IE x28019 JHSniezek, IE x28019 l Distribution: Transmitted H St 3 3 /

l Chairman Hendrie Connissioner Bradford ,

l Commissioner Kennedy S. J. Chilk, SECY C. C. Kammerer, CA Commissioner Gilinsky (ForDistribution) l

-Transmitted: MNBB 9/35 .P. Bldg M et E. Volgenau IE L. V. Gossick, ED0 E. G. Case, NRR Region % M S. H. Hanauer, ED0 - l J. J. Fouchard, PA SS Bldg.9' W (MAIL)

N. M. Haller, MPA C. V. Smith, NMSS T. J. McTiernan, 01A R. G. Ryan, OSP R. Minogue, SD l H. K. Shapar_, ELD - -

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PRELIMINA,RY NOTIFICATION  !

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