ML032380134
| ML032380134 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 08/15/2003 |
| From: | Mecredy R Rochester Gas & Electric Corp |
| To: | Clark R Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NUREG-0654 | |
| Download: ML032380134 (3) | |
Text
4 alay aom I Always at Your Servke Robert C. Mecredy
-Vice President Nuclear Operations August 15, 2003 Mr. Robert L. Clark Office of Nuclear Regulatory Regulation U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001
Subject:
Follow-up Summary of Close-Out of August 14, 2003 Unusual Event Classification Rochester Gas and Electric Corporation R.E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Clark:
In accordance with NUREG 0654, FEMA-REP-1, Rev. 1 reporting requirements which requires a written summary of "close-out or class reduction conditions", the attached close-out summary for the August 14, 2003 Unusual Event classification is hereby submitted.
This event has in no way affected the public's health and safety.
If you should have any questions regarding this submittal, please contact Mr. Thomas Harding, 585-771-3384.
Verytry yours, Robert C. Mecredy attachment An equal opportunity employer I-7,"
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.4,e 89 East Avenue I Rochester, NY 14649 tel (585) 546-2700 www.rge.com It) 0OS'I (a AnEergy, East Cornparvy
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Mr. Robert Clark (Mail Stop 0-8-C2)
Project Directorate I
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Division of Licensing Project Management Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852 Regional Administrator, Region 1 U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 U.S. NRC Ginna Senior Resident Inspector
Attachment to close-out of August 14. 2003 Unusual Event Classification On August 14, 2003, with the plant at 100% power, a major electrical grid disturbance occurred at approximately 1611 hours0.0186 days <br />0.448 hours <br />0.00266 weeks <br />6.129855e-4 months <br /> EDT. This disturbance caused degraded frequency and voltage conditions on the incoming offsite power feeding the facility. An automatic reactor trip occurred and all emergency systems operated as expected. Due to the uncertainty regarding stability of the offsite power, an unusual event was declared in accordance with plant procedure EPIP 1-0, "Ginna Station Event Evaluation and Classification". This was declared under Emergency Action Level (EAL) criteria 6.1.1, (Loss of ability to supply power to the safeguard trains from circuits 751 and 767 for greater than 15 minutes). At approximately 1646 hours0.0191 days <br />0.457 hours <br />0.00272 weeks <br />6.26303e-4 months <br /> EDT offsite notifications were made in accordance with plant procedure EPIP 1-5, "Notifications".
When the grid instabilities were diagnosed, the onsite emergency diesel generators were manually started, loaded, and subsequently supplied emergency power to vital station electrical loads.
Power was subsequently stabilized on circuits 751 and 767.
At approximately 2108 hours0.0244 days <br />0.586 hours <br />0.00349 weeks <br />8.02094e-4 months <br /> EDT on August 14, 2003 offsite grid power and frequency had been demonstrated stable and reliable. Vital station electrical loads were transferred back to offsite power sources and the unusual event was terminated.