ML20236U930
| ML20236U930 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 10/03/1975 |
| From: | Jennifer Davis, Dreher F, Thornburg H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PN-75-100, NUDOCS 9807310183 | |
| Download: ML20236U930 (1) | |
Text
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PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE l
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October 3, 1975
\\v PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --PN-75-100 This preliminary notification constitutes EARLY notice of events 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 OIE staff as of 10:30 a.m. on the date of this notification.
IT SHOULD BE SPECIFICALLY NOTED THAT THIS NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.
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Facility: Millstone Point 2 (DN 50-336)
Northeast Nuclear Energy Company
Subject:
REACTOR COOLANT SYSTEM LEAK & DAMAGED REACTOR COOLANT PUMP MOTOR BEARING A nonisolable leak in the Reactor Coolant System (RCS) was identified last night during plant heatup.
The leak is in a socket welded elbow in a one inch delta P instrument line connected to one of the RCS cold. legs.
The
. leak rate was less than one gallon per minute.
The RCS has been cooled E55 down to make repairs.
This is similar to the leaks reported on September 15, 1975, and October 1, 1975. The caus'e of the leak has not been determined.
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Additionally, the "A" Reactor Coolant Pump Motor Guide Bearing was determined to be damaged and will require replacement.
These events will cause a four or five day delay in the licensee's scheduled date for initial criticality.
An inspection by a Region I specialist will be conducted to review the licensee's investigation and corrective actions concerning the leaks prior to initial criticality.
Media interest is expected because of close attention to Millstone opera-tions and status.
The State of Connecticut has been and is being kept j
informed. A press release is not planned.
f OIE received notification of this occurrence by telephone at 8:45 a.m.,
10/3/75, from Mr. B. Kenyon, Assistant Plant Superintendent.
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Contact:
FADreher, IE x7261 HDThornburg, IE x7353 JGDavis, IE x7541 g
m Distribution:
A ChairmanrAnders Commissioner Mason S. J. Chilk, SE,CY, Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner Kennedy C. C. Kammerer, CA L. V. Gossich, EDO D. F. Knuth, IE J. A. Harris, PA B. C. Rusche, NRR H. H. Brown, ISP T. J. McTiernan, AIA K. R. Chapman, NMSS H. K. Shapar, ELD Transmitted: P Bldged//C m ; H St G gm ; MNBB J.L' Luge fvr4 7RELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 9807310183 751003 i
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