ML071550118
| ML071550118 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 06/13/2007 |
| From: | David M NRC/NRR/ADRO/DORL/LPLI-1 |
| To: | O'Connor T Nine Mile Point |
| david marshall NRR/DORL 415-1547 | |
| References | |
| TAC MD4029, TAC MD4030 | |
| Download: ML071550118 (4) | |
Text
June 13, 2007 Mr. Timothy J. OConnor Vice President Nine Mile Point Nine Mile Point Nuclear Station, LLC P.O. Box 63 Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION, UNIT NOS. 1 AND 2, REPORT OF CHANGES OR ERRORS DISCOVERED IN THE CURRENT ACCEPTABLE EMERGENCY CORE COOLING SYSTEM EVALUATION MODELS (TAC NOS.
MD4029 AND MD4030)
Dear Mr. OConnor:
By letter dated January 11, 2007 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML070170468), Nine Mile Point Nuclear Station, LLC submitted a 30-day report in accordance with Title 10 of the Code of Federal Regulations (10 CFR) 50.46(a)(3)(ii) for a calculated peak cladding temperature (PCT) change of more than 50 degrees for Nine Mile Point Nuclear Station, Unit No. 2 (NMP2). The report resulted from your December 13, 2006, evaluation of a notification by the General Electric Company (GE) of a newly discovered sensitivity to the assumed axial power shape for small break loss-of-coolant accident (LOCA) cases for Boiling-Water Reactor/3 - 6 plants. For NMP2, the evaluation estimated the impact on calculated PCT for a top-peaked power shape to be 90 0F for the limiting analysis. Because the current PCT calculated for the NMP2 GE14 fuel is 1370 0F, the new PCT was estimated to be 1460 0F (1370 0F plus 90 0F). The PCT for Nine Mile Point Nuclear Station, Unit No. 1 (NMP1) was determined to be unaffected by the new sensitivity.
The report concluded that, because of the large margin between the new PCT of 1460 0F and the 10 CFR 50.46 acceptance criteria of 2200 0F, no reanalysis or other actions are planned.
The report also noted that no other changes or errors to the emergency core cooling system evaluation models used for NMP1 or NMP2 were identified during 2006.
The Nuclear Regulatory Commission staff has reviewed the information provided in your report and has determined that, because there were no other changes or errors found in the evaluation models and because the new evaluated PCT has a margin of 740 0F below the 10 CFR 50.46 acceptance criteria limit of 2200 0F for the limiting analysis, no further reanalysis or other actions are required.
T. OConnor If you have any questions, please contact me at 301-415-1547.
Sincerely,
/RA/
Marshall J. David, Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-220 and 50-410 cc: See next page
T. OConnor If you have any questions, please contact me at 301-415-1547.
Sincerely,
/RA/
Marshall J. David, Project Manager Plant Licensing Branch I-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-220 and 50-410 cc: See next page DISTRIBUTION:
PUBLIC RidsNrrPMMDavid RidsNrrLASLittle LPLI-1 PDI-1 Reading File RidsNrrDssSrxb RidsOgcRp RidsNrrAcrsAcnwMailCenter RidsRgn1MailCenter Accession Number: ML071550118 NRR-106 OFFICE LPL1-1/PM LPL1-1/LA SRXB/BC LPL1-1/BC NAME MDavid SLittle GCranston MKowal DATE 6/07/07 6/07/07 6/13/07 6/13/07 OFFICIAL RECORD COPY
T. OConnor Nine Mile Point Nuclear Station cc:
Mr. Michael J. Wallace President Nine Mile Point Nuclear Station, LLC c/o Constellation Energy Group 750 East Pratt Street Baltimore, MD 21202 Mr. Mike Heffley Senior Vice President and Chief Nuclear Officer Constellation Generation Group 1997 Annapolis Exchange Parkway Suite 500 Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 126 Lycoming, NY 13093 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Paul D. Eddy Electric Division NYS Department of Public Service Agency Building 3 Empire State Plaza Albany, NY 12223 Mr. Peter R. Smith, President New York State Energy, Research, and Development Authority 17 Columbia Circle Albany, NY 12203-6399 Mark J. Wetterhahn, Esquire Winston & Strawn 1700 K Street, NW Washington, DC 20006 Supervisor Town of Scriba Route 8, Box 382 Oswego, NY 13126 Carey W. Fleming, Esquire Senior Counsel Constellation Generation Group, LLC 750 East Pratt Street, 17th Floor Baltimore, MD 21202