ML17059A773
| ML17059A773 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/31/1995 |
| From: | Marsh L Office of Nuclear Reactor Regulation |
| To: | Sylvia B NIAGARA MOHAWK POWER CORP. |
| Shared Package | |
| ML17059A774 | List: |
| References | |
| TAC-M91273, NUDOCS 9504110161 | |
| Download: ML17059A773 (8) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O.C. 2055&4001 March 31, 1995 Mr. B. Ralph Sylvia Executive Vice President, Nuclear Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093
SUBJECT:
NINE MILE POINT NUCLEAR STATION UNIT NO.
1 (NHP1),
EVALUATION OF CORE SHROUD STABILIZER DESIGN (TAC NO. H91273)
Dear Mr. Sylvia:
The purpose of this letter is to transmit our safety evaluation (SE) of the~
subject matter.
Based on our review, we find that your proposed core shroud stabilizer design is acceptable as documented in the enclosed safety evaluation.
By letter dated January 6,
- 1995, as supplemented by letters dated January 23, and 26, February 14, 24, and 28, March 7 and 9, two on March 13, two on March 14, March 23, 27, 28, and 30,
- 1995, Niagara Mohawk Power Corporation (NMPC) submitted the details of the planned repair of the circumferential welds for the Nine Mile Point Unit 1 (NHPl) reactor core shroud.
Information was also provided to the NRC staff during conference calls held on March 1, 3, 23, 24, and 27, 1995.
The March 28, 1995, letter confirmed that the information provided during the conference calls would be formally submitted on the NHP1 docket no later than March 31, 1995.
Initially, NHPC's planned permanent repair involved installation of four tie-rod assemblies combined with core plate wedges to replace welds Hl through H7 and six brackets to replace the downward vertical load capability of the H8 weld.
It was NHPC's intention to examine the Hl through H8 shroud welds in accordance with the Boiling Water Reactor Vessel and Internals Project Inspection Criteria and install the tie-rod assemblies and/or the H8 weld brackets only if cracking was found to be unacceptable for continued plant operation.
Based on the results of the ultrasonic examination of the H8 weld, NMPC decided to install the four tie-rod assemblies and not the brackets.
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B. Sylvia The NRC staff has reviewed the above submittals.
Our evaluation is provided in the enclosed Safety Evaluation.
The proposed core shroud repair has been designed as an alternative to the requirements of ASME Boiler and Pressure Vessel Code pursuant to Title 10, Code of Federal Regulations, Part 50.55a(a)(3)(i).
This alternative is acceptable.
This completes our action with respect to TAC No. M91273.
Sincerely, Docket No. 50-220
Enclosure:
Safety Evaluation cc w/encl:
See next page Distribution:
/s/
Ledyard B. Marsh, Director Project Directorate I-l Division of, Reactor Projects I/II Office of Nuclear Reactor Regulation J
Docket File PUBLIC'DI-1 Reading SVarga JZwolinski WKoo LMarsh SLittle GEdison JRajan KKavanagh RWessman OGC ACRS (4)
CCowgill, RI CECarpenter DOCUMENT NAME:
H: iNMPliNM191273.LTR To receive a copy of this document, indicate in the box: "C" Copy without enciosures "E" ~ Copy with enclosures "N" ~ No copy OFFICE NAME PM: PDI-GEdison:cn Cu'rC<~vu ~
LMarsh OGC D PDI-1 DATE 03/ i/9 03
/95 03/8 i/95 OFFICIAL RECORD COPY
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B. Sylvia The NRC staff has reviewed the above submittals.
Our evaluation is provided in the enclosed Safety Evaluation.
The proposed core shroud repair has been designed as an alternative to the requirements of ASME Boiler and Pressure Vessel Code pursuant to Title 10, Code of Federal Regulations, Part 50.55a(a)(3)(i).
This alternative is acceptable.
This completes our action with respect to TAC No. M91273.
Sincerely, Docket No. 50-220
Enclosure:
Safety Evaluation cc w/encl:
See next page Ledyard B. Marsh, Director Project Directorate I-1 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation
B. Ralph Sylvia Niagara Hohawk Power Corporation Nine Mile Point Nuclear Station Unit No.
1 CC:
Hark J. Wetterhahn, Esquire Winston E Strawn
'400 L Street, NW Washington, DC 20005-3502 Supervisor Town of Scriba Route 8, Box 382
- Oswego, NY 13126 Hr. Louis F. Storz Vice President - Nuclear Generation Niagara Mohawk Power Corporation Nine Nile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Resident Inspector U.S. Nuclear Regulatory Commission P.O.
Box 126
- Lycoming, NY 13093 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, NY 13202 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, PA 19406 Ms. Donna Ross New York State Energy Office 2 Empire State Plaza 16th Floor
- Albany, NY 12223 Hr. Richard B. Abbott Unit 1 Plant Manager Nine Mile Point Nuclear Station P.O.
Box 63
.Lycoming, NY 13093 Mr. David K. Greene Manager Licensing Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Charles Donaldson, Esquire Assistant Attorney General New York Department of Law 120 Broadway New York, NY 10271 Hr. Paul D.
Eddy State of New York Department of Public Service Power Division, System Operations 3 Empire State Plaza
- Albany, NY 12223 Mr. Martin J. HcCormick, Jr.
Vice President Nuclear Safety Assessment and Support Niagara Hohawk Power Corporation Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093
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