ML20151U642
| ML20151U642 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 04/21/1977 |
| From: | Dreher F, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-064, PNO-77-64, NUDOCS 9809110093 | |
| Download: ML20151U642 (1) | |
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% Q cg\\ h. 4 P-m PRELIMINARY NOTIFICATION April 21, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-PNO-77-64 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 on this date.
' Facility:
Beaver Valley Unit No.1 (DN 50-334)
Duquesne Light Company
Subject:
PLANT SHUTDOWN DUE TO INADVERTENT MAIN STEAM IS0ILTION VALVE At 5:31 p.m. on April 20, 1977, with the plant operating at 100% power, an inadvertent closure of a main steam isolation valve caused a safety injection signal and a plant trip. All safety systems functioned as designed. The plant is being cooled down to effect repairs. The cause of the valve closure is not known at this time but repair efforts are expected to take 2 to 3 days.
There were no adverse safety consequences or personnel injuries. A NRC inspec-tor is on site reviewing the licensee's findings.,
Media interest is expected because of recent feedwater system piping problems and close attention given to nuclear facilities. The State of Pennsylvania has been informed. A press release is not planned.
NRC, Region I, (Philadelphia) received notification of this occurrence by telephone from an inspector onsite at 8:30 a.m. on April 21, 1977.
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Contact:
FADreher, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 Distribution: Transmitted H St //f/
Chairman Rowden C'. C. Xammerer, CA G. F. Murphy, JCAE Commissioner Gilinsky S. J. Chilk, SECY H. H. Whiteside, SCNR H. R. Myers, HCEE Transmitted: MNBB/.'fY P Bldg //[I SS Bldg M c 0 n
L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMSS S. H. Hanauer, EDO H. K. Shapar, ELD J. A. Harris, PA W. G. Mcdonald, MIPC Luge (MAIL)
E. Volgenau, IE R. G. Ryan, OSP T. J. McTiernan, CIA Region'3T LI O k PRELIMINARY NOTIFICATION
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d00033 9809110093 770421 PDR I&E
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PNO-77-064 PDR 3