ML20151U425

PNO-77-078:on 770509,licensee Reported Inadvertent Spillage of Approx 50,000 Gallons of Water from RWST to Basement of Auxiliary Bldg on 770507.No Significant Personnel Exposure or Contaminations & Release Offsite Occurred

ML20151U425
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	05/10/1977
From:	Roy G, Thompson D, Whitt K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-078, PNO-77-78, NUDOCS 9809110003
Download: ML20151U425 (2)

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,,y PRELIMINARY NOTIFICATION PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-78 1

This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information presented is as initially received without verifica' tion or evaluation and is basically all that is known by IE staff on this date.

Facility: Portland General Electric Company Trojan Nuclear Plant (Docket No. 50-344)

Oregon

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Subject:

Spillage of Refueling Water Storage Tank Water Into Auxiliary Building Basement The licensee reported to Region V (Walnut Creek, California) inspectors, upon their arrival on site on May 9, the inadvertent spillage of approximately 50,000 gallons of water from the Refueling Water Storage Tank (RWST) into the basement of the Auxiliary Building.

The spillage occurred on the graveyard shift on May 7, when a manway gasket failed on an ion-exchange demineralizer tank through which the RWST water was being circulated for cleanup.

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The water, which had a radioactive concentration of approximately one microcurie per milliliter, accumulated at a depth of approximately t.wo feet in the basement of the auxiliary building. There were no significant personnel exposures or contaminations and no release offsite from the occurrence. The plant is currently shutdown for scheduled maintenance, and will resume operation in early June.

Cleanup, by pump,ing and thorough swabbing of floors, is expected to be completed on May 10.

No equipment within the auxiliary building was disabled by the occurrence. Region V inspectors are examining details of the occurrence while on site for a routine inspection.

The licensee has not yet made notice to the news media, however they plan to cover this occurrence, as well as a similar occurrence

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of water spillage (of approximately 200 to 1000 gallons) into the reactor containment building (when a manway was removed from the "C" steam generator on May 8) in a routine weekly report to the

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local news media on 5/10/77.

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CONTINUE r

9809110003 770510 PDR I&E PNO-77-078 PDR

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Page 2 PNO-77-78 Continued

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. l Hay 10, 1977

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OIE (Region V) received notification of this occurrence by telephone from a Region V inspector on site at approximately 4:00 p.m. on 5/9/77.

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Contact:

KWhitt, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 Distribution: TransmittedHSt,7,*4.[/

Chairman Rowden C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Kennedy S. J. Chilk, SECY H. H. Whiteside, SCNR Commissioner Gilinsky H. R. Myers, HCEE Transmitted: MNBB$'ff PBldg,bl[

SS Bldg 2E [ 7 i

L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMSS S. H. Hanauer, EDO J. A. Harris, PA I

W. G. Mcdonald, MIPC Luge (MAIL)

E. Volg,enag, M /

IE Region'.7'3 i

R. G. Ryan, OSP T. J. McTiernan, OIA H. K. Shapar, ELD 1.

f PRELIMINARY NOTIFICATION

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