PNO-III-80-193, on 801018,reactor Trip Occurred.Caused by Unit Differential Trip from Fault Indication from Neutral Ground Transformer.Actual Source of Signal Was Short Circuit in One Main Phase Winding of Main Generator
| ML17319A717 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 10/20/1980 |
| From: | Boyd D, Heishman R, Swanson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-80-193, NUDOCS 8102230433 | |
| Download: ML17319A717 (2) | |
te:
October 2P, 198P pprI I ',I,';ARY NOTIF ICAT lON OF EVENT OR UNUSUAL OCCURENCE
--PNO-I II-GO-This reliminary notification constitutes EARLY notice of events SI safety or ublic interest si nificance.
The information resent z ~
~Q, initially received without verification or evaluation and is ba 1
that is known b
-IE staff as of this date.
Facility:
American Electric Power Service Corporation Indiana 5 Nichigan Power Company~
D.
C.
Cook Unit 2 (DN 50-316)
Bridgman NI r~
Subject:
EQUIPf'lEiVT MALFUNCTION RESULTING IN AN OUTAGE OF GREATER THAN TWO D
On October 18, 1980, whi Le operating at fuLL power, a reactor trip occurred.
The trip was due to a unit differentiaL trip from a fault indication from the neutraL ground transformer.
Investigations by the Licensee confirmed that the actuaL source of this signaL was a short circuit in one of the main phase windings of the main generator.
PreLiminary. visuaL inspection of the main generator reveals
The Licensee estimates that it wiLL require a minimum of one month for repairs.
The unit is in the co Ld shutdown mode.
All systems functioned as required in response to the trip.
There were no radio-Logical releases.
The State of Nichigan wiLL be notified.
The Licensee plans to issue a press release.
This PN is issued for information only.
This on October 20, 1980.
~~AJd.-~~(
Contact:
D.
C.
Bo~0
+ E.
Swans n
'1 2/932-2546 616/465"6775-information is current as of 11:00 a.m.
R.
F. Heishman 312/932-2540 gistributiun:
Transmitted H St.oo'd':>b Chairman Ahearne Commissioner Hendrie Commissioner Gilinsky Corrmissioner 8radford ACRS S. J.
Chi 1k, SECY C.
C.
Karrrnerer, CA (For Distribution)
Transmi tted:
MN88/D.v M. J. Dircks, EDO C. Michelson, AEOD J. J.
- Fouchard, PA H.
M. Hailer, MPA G.
W. Kerr, OSP H. K. Shapar, ELD Regional Offices l/
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P. Bldg.~a:SF H.
R. Denton, HRR R.
H. Yollmer, NRR R. J. Mattson, NRR D. F. Ross, NRR D. Eisenhut, NRR S.
H. Hanauer Millste 81dg. /l.'e<
J.
G. Davis, NMSS E. Hurley, RES PRELIMINARY NOTIFICATION'o:oooo~a (Io:oO oi t.
Landow (6 min/page)
J. J.
- Cummings, OIA HA1L R. Minogue, SD IE:XOOS Document Mgt. Br. (For PDR/LI
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