ML20045C968
| ML20045C968 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 06/22/1993 |
| From: | Menning J Office of Nuclear Reactor Regulation |
| To: | Sylvia B NIAGARA MOHAWK POWER CORP. |
| Shared Package | |
| ML20045C969 | List: |
| References | |
| TAC-M86013, NUDOCS 9306250166 | |
| Download: ML20045C968 (3) | |
Text
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UNITED STATES o
j NUCLEAR REGULATORY COMMISSION
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WASHINGTON, D. C. 20555
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June 22, 1993 Docket No. 50-410 Mr. B. Ralph Sylvia Executive Vice President, Nuclear Niagara Mohawk Power Corporation 301 Plainfield Road Syracuse, New York 13212
Dear Mr. Sylvia:
SUBJECT:
SAFETY EVALUATION FOR NIAGARA M0 HAWK POWER CORPORATION'S PROPOSAL TO CONTINUE TO OPERATE NINE NILE POINT, UNIT NO. 2, WITH A FLAW IN HIGH PRESSURE CORE SPRAY N0ZZLE SAFE END WELD KC-32 (TAC N0. M86013)
By letter dated May 6, 1992, the NRC staff approved a Niagara Mohawk Power Corporation (NMPC) proposal to operate Nine Mile Point Nuclear Station, Unit 2 (NMP-2), for up to a maximum of 9700 hours0.112 days <br />2.694 hours <br />0.016 weeks <br />0.00369 months <br /> during the current (third) fuel cycle with a flaw in the weld joining the high oressure core spray nozzle safe end to safe end extension. The staff's letter of May 6,1992, noted that NMPC had committed to either submit its justification for continuing to operate through to the third refueling outage or repair or replace the weld prior to exceeding 9700 hours0.112 days <br />2.694 hours <br />0.016 weeks <br />0.00369 months <br /> of operation.
By letter dated March 16, 1993, as supplemented April 30, 1993, NMPC submitted the results of a fracture mechanics analysis that provided justification for up to 11,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation in the third fuel cycle.
Staff approval of 11,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> of operation in the third fuel cycle would allow continued operation of NMP-2 until the scheduled start of the third refueling outage.
The NRC staff has completed its review of the NMPC submittals of March 16 and April 30, 1993. As discussed in the enclosed safety evaluation, we did not accept the results of the fracture mechanics analysis as justification for continued operation.
However, based on the considerations that the weld was subjected to the Mechanical Stress Improvement Process and that the results of subsequent ultrasonic examinations have shown no apparent flaw growth, the staff did conclude that the structural integrity of the weld would be 2400?U em : mm c w m e w. w.m a v 9306250166 930622 PDR ADOCK 0500 0
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Mr. B. Ralph Sylvia June 22,1993 maintained during the current fuel cycle, and that operation of NMP-2 for up to 11,000 hours0 days <br />0 hours <br />0 weeks <br />0 months <br /> in the current fuel cycle is acceptable.
This concludes the staff's efforts under TAC No. M86013.
Sincerely,_
[
dht John E. Henning,~ roject Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page l
l
9 Mr. B. Ralph Sylvia Nine Mile Point Nuclear Station Niagara Mohawk Power Corporation Unit No. 2 cc:
Mark J. Wetterhahn, Esquire Regional Administrator, Region I Winston & Strawn U. S. Nuclear Regulatory Commission 1400 L Street, NW.
47S Allendale Road Washington, DC 20005-3502 King of Prussia, PA 19406 Mr. Richard Goldsmith Charles Donaldson, Esquire Syracuse University Assistant Attorney General College of Law New York Department of Law E. I. White Hall Campus 120 Broadway Syracuse, New York 12223 New York, New York 10271 Resident Inspector Mr. Richard M. Kessel Nine Mile Point Nuclear Station Chair and Executive Director P. O. Box 126 State Consumer Protection Board Lycoming, New York 13093 99 Washington Avenue Albany, New York 12210 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation Mr. Martin J. McCormick Jr.
300 Erie Boulevard West Plant Manager, Unit 2 6
Syracuse, New York 13202 Nine Mile Point Nuclear Station Niagara Mohawk Power Corporation Mr. David K, Greene P. O. Box 32 Manager Licensing Lycoming, New York 13093 Niagara Mohawk Power Corporation 301 Plainfield Road Mr. Neil S. Carns Syracuse, New York 13212 Vice President - Nuclear Generation Nine Mile Point Nuclear Station Ms. Donna Ross Niagara Mohawk Power Corporation j
New York State Energy Office P. O. Box 32 2 Empire State Plaza Lycoming, New York 13093 i
16th Floor Albany, New York 12223 Supervisor Town of Scriba Route 8, Box 382 Oswego, New York 13126 D