PNO-III-87-104, on 870801,reactor Scram Occurred as Result of Turbine & Generator Trips Due to Fault in Main Transformer. Licensee Investigating Cause of Problem.Unit Expected to Be Shut Down for Several Wks for Replacement of Transformer
| ML20236L326 | |
| Person / Time | |
|---|---|
| Site: | Quad Cities  |
| Issue date: | 08/03/1987 |
| From: | Forney W, Ring M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-87-104, NUDOCS 8708100213 | |
| Download: ML20236L326 (1) | |
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bm3 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-87-104 Date August 3, 1987 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety [
or public interest significance.
The information is as initially received without verification or evaluation, and is basically all that is known by the Region III staff on this date.
Facility:
Commonwealth Edison Company Licensee Emergency Classification:
Quad Cities 2 Notification of an Unusual Event Cordova, IL 61242 Alert Site Area Emergency Docket No. 50-265
__ General Emergency X Not Applicable
Subject:
SHUTDOWN DUE TO MAIN TRANSFORMER FAULT l At approximately 2:22 p.m. on August 1, 1987, the reactor scrammed as a result of turbine and generator trips after a fault occurred in the main transformer.
Following the scram, the two electrical buses supplying power to the two motordriven feedwater pumps tripped. The reactor core isolation cooling (RCIC) system did not start initially using the " fast start" procedure, but was manually started to maintain reactor i water level. A reactor feedwater pump was also started.
l One scram discharge volume drain isolation valve did not indicate fully closed after the
' scram, and the licensee is investigating the cause of this problem.
The unit is expected to be shut down for several weeks for replacement of the main i transformer.
The senior resident inspector arrived at the plant at 3 p.m. on August 2,1987, to review the circumstances of the scram. The resident inspectors will continue to monitor the licensee's evaluation of the scram and subsequent transformer replacement activities.
The State of Illinois will be informed.
The Headquarters Duty Officer was notified at 3:22 p.m. on August 1, 1987. This information is current as of 10 a.m., August 3, 1987.
g[. y CONTACT:
M. Ring
. Forney FTS 388-5602 FTS 388-5590 l
DISTRIBUTION:
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Chairman Zech PA IE NMSS DOT:Trans only j
Comm. Roberts ELD OIA RES i
a gj Comm. Bernthal AEOD NRC Ops Ctr 7
Comm. Carr ACRS SP g y Regional Offices SECY
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CA INP0 7 NSAC 7
s PDR RIII Resident Office Licensee:
/-/ 83 (Corp. Office-ReactorLiA*.Only) b 9708100213 870803 PDR I&E Region II p g PND-III-87-104 PDR Rev. J y 1987 TE3 '{