ML17059A642
| ML17059A642 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/02/1995 |
| From: | Brinkman D Office of Nuclear Reactor Regulation |
| To: | Sylvia B NIAGARA MOHAWK POWER CORP. |
| Shared Package | |
| ML17059A643 | List: |
| References | |
| GL-94-03, GL-94-3, TAC-M90103, NUDOCS 9502060092 | |
| Download: ML17059A642 (8) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 2055&4001 February 2, 1995 Hr. B. Ralph Sylvia Executive Vice President, Nuclear Niagara Hohawk Power Corporation Nine Hile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093
SUBJECT:
GENERIC LETTER (GL) 94-03, "INTERGRANULAR STRESS CORROSION CRACKING OF CORE SHROUDS IN BMRs," NINE HILE POINT NUCLEAR STATION, UNIT 2 (NHP-2)
(TAC NO. H90103)
Dear Hr. Sylvia:
By letter dated August 23, 1994, Niagara Hohawk Power Corporation (NHPC) provided NHPC's response to GL 94-03, "Intergranular Stress Corrosion Cracking of Core Shrouds in BMRs," for NHP-2.
The NRC staff requested in GL 94-03 that licensees take the following actions with respect to their core shrouds:
1)j inspect their core shrouds in their BMR plants no later than the next refueling outage,
- 2) perform materials related and plant specific consequence safety analyses with respect to their core shrouds,
- 3) develop core shroud inspection plans which address inspection of all core shroud welds and which takes into account the latest available inspection technology,
- 4) develop plans for evaluation and/or repair of their core shrouds, and 5) work closely with the BMR Owners Group with respect to addressing intergranular stress corrosion cracking of BMR internals.
The NRC staff required that licensees
- submit, under oath or affirmation, the following information in response to GL 94-03 within 30 days of the date of issuance:
1) a schedule for inspection of their core shrouds, 2) a safety
- analysis, including a plant-specific safety analysis as appropriate, which supports continued operation of the facility until inspections are conducted, 3) a drawing(s) of the core shroud configurations, and 4) a history of shroud inspections completed to date.
The NRC staff also required that licensees
- submit, under oath or affirmation, no later than 3 months prior to performing their core shroud inspections, their scope for inspection of their core shroud and their plans for evaluating and/or repairing their core shroud based on inspection.re'suits.
The NRC staff further required licensees to submit, under oath or affirmation, their core shroud inspection results within 30 days of completing their shroud examination.
The NRC staff has completed its review of your response.
Based on the staff's review of the response to GL 94-03, and in regard to the information that was requested to be submitted within 30 days of the date of issuance of the GL, the staff has determined that NHPC has provided the necessary information for the staff to complete its review.
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B. R. Sylvia February 2,
1995 The NRC staff concludes that while cracking cannot be entirely ruled out, the NHP-2 core shroud is not likely to contain cracks which could compromise its structural integrity.
The low water conductivity, short operational
- time, and use of low carbon materials minimize the potential for the initiation and growth of structurally significant cracks.
The staff concludes that the licensee's materials based safety assessment of the NMP-2 shroud is sufficient to justify continued safe operation of the unit until the first refueling outage after NMP-2 surpasses 8 on-line years of operation without necessitating a detailed consequence analysis.
However, per the reporting requirements of GL 94-03, the licensee shall submit, no later than 90 days prior to entering the outage in which the core shroud inspection is scheduled to occur, a detailed inspection scope for a more comprehensive examination of the NMP-2 shroud.
Sincerely, Original signed by Docket No.:
50-410
Enclosure:
Safety Evaluation cc w/encl:
See next page ib Docket File PUBLIC PD I-1 Rdg.
SVarga JZwolinski LMarsh CVogan DBrinkman JStrosnider RJones RWessman PRush OGC ACRS (4)
CCowgill, RI Donald S. Brinkman, Senior Project Manager Project Directorate I-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation DOCUMENT NAME:,
H: iNMP2iNM290103. LTR To receive e copy of this document, indicete in the box: "C" ~ Copy without enclosures "E" ~ Copy with enclosures "N" ~ No copy DBrinkman:c NAME CVo an c'QA OFFICE LA:PDI-1 E
PM:PDI-1 D PDI-1 IN LMarsh DATE 0 /
/95 V/I 95 0'
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B. R. Sylvia The NRC staff concludes that while cracking cannot be entirely ruled out, the NHP-2 core shroud is not likely to contain cracks which could compromise its structural integrity.
The low water conductivity, short operational
- time, and use of low carbon materials minimize the potential for the initiation and growth of. structurally significant cracks.
The staff concludes that the licensee's materials based safety assessment of the NHP-2 shroud is sufficient to justify continued safe operation of the unit until the first refueling outage after NHP-2 surpasses 8 on-line years of operation without necessitating a detailed consequence analysis.
However, per the reporting requirements of GL 94-03, the licensee shall submit, no later than 90 days prior to entering the outage in which the core shroud inspection is scheduled to occur, a detailed inspection scope for a more comprehensive examination of the NHP-2 shroud.
Sincerely, Docket No.:
50-410
Enclosure:
Safety Evaluation cc w/encl:
See next page Donald S. Brinkman, Senior Project Hanager Project Directorate I-I Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
B. Ralph Sylvia Niagara Mohawk Power Corporation Nine Hile Point Nuclear Station Unit 2 CC:
Mark J. Wetterhahn, Esquire Winston 5 Strawn 1400 L Street, NW.
Washington, DC 20005-3502 Hr. Richard Goldsmith Syracuse University College of Law E. I. White Hall Campus
- Syracuse, NY 12223 Resident Inspector Nine Mile Point Nuclear Station P.O.
Box 126
- Lycoming, NY 13093 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, NY 13202 Hr. David K. Greene Manager Licensing Niagara Mohawk Power Corporation Nine Hile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Ms.
Donna Ross New York State Energy Office 2 Empire State Plaza 16th Floor
- Albany, NY 12223 Supervisor Town of Scriba Route 8, Box 382
- Oswego, NY 13126 Regional Administrator, Region I U. S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Mr. Richard H. Kessel Chair and Executive Director State Consumer Protection Board 99 Washington Avenue
- Albany, NY 12210 Hr. Kim A. Dahlberg Plant Hanager, Unit 2 Nine Hile Point Nuclear Station Niagara Mohawk Power Corporation P.O.
Box 63
- Lycoming, NY 13093 Hr. Louis F. Storz Vice President - Nuclear Generation Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Hr. Hartin J. HcCormick, Jr.
Vice President Nuclear Safety Assessment and Support Niagara Mohawk Power Corporation Nine Hile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093