ML20236K934

PNO-77-019:on 770117,during SG Repair Activities,About 8,000 Gallons of Secondary Sys Water Was Inadvertently Released to Turbine Building Sumps

ML20236K934
Person / Time
Site:	Oconee
Issue date:	02/02/1977
From:	Gower G, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-019, PNO-77-19, NUDOCS 9807100145
Download: ML20236K934 (1)

Text

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PRELIMINARY NOTIFICATION February 2, 1977 O PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-PNO-77-19

, , This preliminary notification constitutes EARLY notice of an event of.

POSSIBLE safety cv public interest significance. The information

[presentedisasinitiallyreceivedwithoutverificationorevaluation 3

, and is basically all that is known by IE staff on this date, {

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' Facilityi ' Duke Power Company (DPC) 1 Oconee Unit No. 1 ,,

Subject:

I

. _ - . .. UNPLANNED AREA RELEASE OF RADIOACTIVE LIQUID TO AN UNRESTRICTED On January 17, 1977, during steam generator repair activities, about r-8,000 gallons of secondary system water was inadvertently released j to turbine building sumps. The secondary system water was contami- '

nated due to a steam generator tube leak that occurred on January 15, 1977. The water was automatically pumped from the sumps to plant set-tling basins whi'ch overflowed to the Keowee River. During periods be- ,

i tween January 17 and January 20, the concentration of iodine-131 in j

the river at the basin outfall exceeded the technical specification limits. About three curies of iodine-131 were released as of January 28, g=

1977.

Water samples taken following the release indicated that radioactivity

( in the river at the nearest drinking water intake station posed no threat to public health and safety.

Region 11 performed on-site inspection following this occurrence and issued an Immediate Action Letter on February 1, 1977, confirming 11-censee comitments for corrective actions.  !

The plant manager has discussed the event with the Seneca Journal, Seneca, South Carolina, and Region II expects to issue a press release on 2/2/77.

Contact:

GCGower, IExx27261 GWRoy, IE x27261 DThompson, IE x27541 Distribution:

Chairman Rowden Commissioner Kennedy S. J. Chilk, SECY Commissioner Gilinsky C. C. Kammerer, CA G. F. Murphy, JCAE L. V. Gois'ick, EDO K. R. Chapman, NMSS R. G. Ryan, OSP

• S. H. Hanauer, EDO E. Volgenau, OIE J. A. Harris, PA B. C. Rusche, NRR H. K. Shapar, ELD T. J. McTiernan, OIA ,

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PDR I&E PNO-77-019 PDR L