ML20236X042

PN-75-130:on 751116,reactor Protective Sys Instrument Power Bus Breaker Trip Caused Reactor Trip & Initiated Safety Injection,Also Caused Loss of Portions of Generator Bearing Oil Lubrication Sys

ML20236X042
Person / Time
Site:	Point Beach
Issue date:	11/19/1975
From:	Jennifer Davis, Thornburg H, Warnick R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PN-75-130, NUDOCS 9808070070
Download: ML20236X042 (1)

Text

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,, 2 .%g)J p PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSURE 0 November 19, 1975 l :m k PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE --PN-75-130 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 1:00 p.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 l

~ NOTIFICATION OF AN INCIDENT OR OCCURPINCE (BLUE SHEET) SUBSEQUENTLY

" WILL BE ISSUED IF WARRANTED.

1 Facility: Point Beach Unit 1 (Wisconsin Michigan Power Company)

Subj ect: REFUELING OUTAGE BEGUN 10 DAYS EARLY DUE TO GENERATOR BEARING 1 DAMAGE FOLLOWING REACTOR TRIP l 1

A reactor protective system instrument power bus breaker trip on 11/16/75, which caused a reactor tri}. and initiated safety injection, also caused a loss of portions of the gen 3rator bearing oil lubrication system. The loss of bearing lubrication resOlted in damage to several generator bearings.

Unit I was scheduled to shutdown for refueling 11/28/75.- Due to the .

necessity for replacement of several generator bearings, licensee management E elected to go into the refueling outage at this time. There was no damage to the nuclear steam supply systezi as a result of the trip, and no releases

( of radioactivity occurred due to the event.

A company news release was made 11/17/75 regarding the cause of the reactor trip on 11/16/75.

The resident inspector will conduct routine followup on this event.

i Region III received notification of the reactor trip and possible generator bearing damage on November 17 and confirmation of bearing damage and the resultant early refueling outage on November 19, 1975.

Both notifications were by telephone from G. Reed, Plant Manager.

Contact:

RFWarnick, IE x27261 HDThornburg, IE x27353 JGDavis, IE x27541 Distribution: s l Chairman Anders Commissioner Mason S. J. Chilk, SECY i Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE Commissioner Kennedy C. C. Kammerer, CA . . .

L. V. Gossick- EDO D. F. Knuth, IE J. A. Harris, PA B. C. Rusche, h4 J. La Fleur, ISP '

T. J. McTiernan, AIA g'f' K. R. Chapman, NMSs H. K. Shapar, ELD Transmitted: P Bldg 2 ON

h St 2

MNBB 3  ; Luge a p_ 7-I A

a . q PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLOSUPI 9808070070 751119 PDR I&E PN-75-130 PDR