ML20151U881
| ML20151U881 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/25/1977 |
| From: | Dreher F, Roy G, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-066, PNO-77-66, NUDOCS 9809110213 | |
| Download: ML20151U881 (1) | |
Text
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PRELIMINARY NOIIFICATION h
p,)p, April 25, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE-PNO-77-66 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: Millstone Unit No. 2 (DN 50-336)
Northeast Nuclear Energy Company
Subject:
REACTOR COOLANT SYSTEM LFAK INTO CONTAINkENT BASEMENT During repair of an nonisolable leak in a one inch Reactor Coolant System (RCS) pressure sensing line, a freeze seal on the line broke. At the time of the leak the plant was on shutdown cooling with the RCS pressure at 100 psia.
The failure of the freeze plug resulted in 7,000 gallons of water being drained into the containment basement before the leak was stopped by par-tially draining the RCS. The water was removed from the containment sump l
by pumping to the radioactive waste system. An airborne contamination prob-lem existed inside containment and a local emergency was declared inside the containment during the occurrence.
No radioactivity was released outside Containment and no personnel over-exposures occurred.
Media interest is expected because of-close attention given to operating 2 51 problems at nuclear facilities. The state of Connecticut has been informed..
l A press release is not planned.
{
NRC Region I Office (Philadelphia) received notification of this occurrence by telephone from the Unit Superintendent at 4:30 p.m. on April 22, 1977.
IE:HQ was informed of this occurrence by telephone on April 22, 1977.
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Contact:
FADreher, IE x27261 GWRoy, IE x27261 DThompson, IE x27541 Distribution: Transmitted H St / DIN (M Chairman Rowden C. C. Kammerrr, CA G. F. Murphy, JCAE Commissioner Gilinsky S. J. Chilk, SECY H. H. WhitesidE SCNR H. R. Myers, HCEE Transmitted: MNBB /d.*MM *P Bldg / M.* N S,#
- SS Bldg /d* I d W L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMS!f S. H. Hanauer, EDO H. K. Shapar, ELD J. A. Harris, PA W. G. Mcdonald, MIPC Luge (MAIL)
E. Volgenau IE Region (,/d! T M d.,
R. G. Ryan,'OSP T. J. McTiernan, OIA PRELIMINARY NOTIFICATION 3f0 4 n n (' 'l l 9809110213 770425 PDR I&E PNO-77-066 PDR
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