05000317/LER-2002-001, Re Vital Bus Circuit Breaker Inoperable Due to Seismic Positioner Mounting
| ML021150124 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 04/19/2002 |
| From: | Katz P Constellation Nuclear |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| LER-02-001-00 | |
| Download: ML021150124 (7) | |
| Event date: | |
|---|---|
| Report date: | |
| 3172002001R00 - NRC Website | |
text
Peter E. Katz Plant General Manager 1650 Calvert Cliffs Parkway Lusby, Maryland 20657 410 495-4101 Constellation Nuclear Calvert Cliffs Nuclear Power Plant A Member of the Constellation Energy Group April 19, 2002 U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION:
SUBJECT:
Document Control Desk Calvert Cliffs Nuclear Power Plant Unit No. 1; Docket No. 50-317; License No. DPR 53 Licensee Event Report 2002-01 Vital Bus Circuit Breaker Inoperable Due to Seismic Positioner Mounting The attached report is being sent to you as required under 10 CFR 50.73 guidelines. Should you have questions regarding this report, we will be pleased to discuss them with you.
Very trul yours, PEK/MJY/bjd Attachment cc:
R. S. Fleishman, Esquire J. E. Silberg, Esquire Director, Project Directorate I-1, NRC D. M. Skay, NRC H. J. Miller, NRC Resident Inspector, NRC R. I. McLean, DNR I/'V
Abstract
On March 8, 2002, it was determined the 14B 480 Volt AC Vital Bus Supply Circuit Breaker (52-1413) was not operable since initial licensing of Unit 1 until breaker replacement occurred during maintenance on March 5, 2002. The 14B 480 Volt AC Vital Bus Supply Circuit Breaker (52-1413) was installed in the plant with the seismic positioner oriented upside down relative to the position in which the breaker was originally qualified for a Safe Shutdown Earthquake.
This condition probably originated during field installation of the breaker during construction.
Unit 1 was defueled when this condition was discovered. Unit 2 was operating at 100 percent power.
Event investigation concluded the seismic positioner was installed incorrectly since initial construction and the breaker was inoperable but functional in all conditions except during and after a Safe Shutdown Earthquake. All safety-related 480 Volt AC circuit breakers have been inspected. No other seismic positioners were found out of position.
NRC FORM 366 (7-2001)
(if more space is required, use additional copies of (If more space is required, use additional copies of (if more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A)
C.
Number and location of Westinghouse 480 Volt AC 'DS' style circuit breakers:
Location Number of Breakers Unit 1 27' Switchgear 24 Unit 1 45' Switchgear 24 Unit 2 27' Switchgear 24 Unit 2 45' Switchgear 24 No. 1A Emergency Diesel Generator Building 4