ML043650342
| ML043650342 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 12/23/2004 |
| From: | Korsnick M Constellation Energy Group |
| To: | Clark R Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| BL-03-001 | |
| Download: ML043650342 (3) | |
Text
Maria Korsnick 1503 Lake Road Vice President Ontario, New York 14519-9364 585.771.3494 585.771.3943 Fax maria.korsnicktconstellation.com Constellation Energy R.E. Ginna Nuclear Power Plant December 23, 2004 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-on item associated with the 60 Day response to NRC Bulletin 2003-01, "Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors" R.E. Ginna Nuclear Power Plant Docket No. 50-244
Dear Mr. Clark:
By letter dated August 8, 2003 the R.E. Ginna Nuclear Power Plant committed to "If feasible, implement at-power RHR NPSH calculation aid, including procedure changes and operator training" by December 31, 2004.
The purpose of the RHR NPSH calculation aid was to provide information to the operator as to when and to what extent, to reduce RHR flow during the sump recirculation phase following a loss-of-coolant-accident (LOCA). Since the time of that commitment, Ginna personnel have worked closely with the Westinghouse Owner's Group (WOG) to develop possible improvements in Emergency Operating Procedures (EOPs) to ameliorate the effects of sump clogging following a LOCA.
As stated in our November 8, 2004 response, we are pursuing procedure changes to reduce both the number of pumps (I vs. 2) and the required flowrate during the post-LOCA sump recirculation phase. Analytical accident analysis tools as well as simulator scenarios are being used to justify these changes, which are expected to be implemented by August 1, 2005.
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Use of currently available measures such as RHR pump motor current or RHR pump flow to assess NPSH availability, coupled with the implementation of these pending EOP changes, are considered to eliminate the need for additional RHR NPSH calculational aids. If our analyses determine that these EOP changes are not feasible, we will further review the implementation of such measures.
Very truly yours, Mary G. Korsnick STATE OF NEW YORK:
TO WIT:
COUNTY OF WAYNE I, Mary G. Korsnick, being duly sworn, state that I am Vice President - R.E. Ginna Nuclear Power Plant, LLC (Ginna LLC), and that I am duly authorized to execute and file this response on behalf of Ginna LLC. To the best of my knowledge and belief, the statements contained in this document are true and correct. To the extent that these statements are not based on my personal knowledge, they are based upon information provided by other Ginna LLC employees and/or consultants. Such information has been reviewed in accordance with company practice and I lieve it to b7r NW
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Subscribed and sworn before me, a Notary Public in and for the State of New York and County of rMbntDZp, this A3 day ofj aytJ3m
. 2004.
WITNESS my Hand and Notarial Seal:
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Notary Vublic SHARON L MILLER My Commission Expires:
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Mr. Robert L. Clark (Mail Stop 0-8-C2)
Project Directorate I Division of Licensing Project Management Office of Nuclear Regulatory Regulation U.S. Nuclear Regulatory Commission One White Flint North 11555 Rockville Pike Rockville, MD 20852
Regional Administrator, Region I U:S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 U.S. NRC Ginna Senior Resident Inspector Mr. Peter R. Smith New York State Energy, Research, and Development Authority 17 Columbia Circle Albany, NY 12203-6399 Mr. Paul Eddy NYS Department of Public Service 3 Empire State Plaza, 10& Floor Albany, NY 12223 James M. Petro Jr.
Counsel, Generation - Nuclear Constellation Energy 750 East Pratt Street, 17th Floor Baltimore, MD 21202