ML17059B436
| ML17059B436 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 02/20/1997 |
| From: | Hood D NRC (Affiliation Not Assigned) |
| To: | Sylvia B NIAGARA MOHAWK POWER CORP. |
| References | |
| TAC-M95100, NUDOCS 9702250099 | |
| Download: ML17059B436 (8) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 20, 1997 QD-220 Mr. B. Ralph Sylvia Executive Vice President Generation Business Group and Chief Nuclear Officer Niagara Mohawk Power Corporation Nuclear Learning Center 450 Lake Road
'swego, NY 13126
SUBJECT:
INSPECTION OF THE CORE SPRAY SYSTEM PIPING AND SPARGERS FOR NINE MILE POINT NUCLEAR STATION UNIT NO.
1 SPRING 1997 OUTAGE (TAC NO.
M95100)
Dear Mr. Sylvia:
By letter dated January 29,
- 1997, you provided the NRC staff with plans for performing core spray internal piping system inspections during the spring 1997 refueling outage for Nine Mile Point Nuclear Station Unit No.
1 (NMPl),
including your intention to modify the present commitments associated with IE Bulletin (IEB) 80-13, "Cracking in Core Spray Spargers,"
dated May 12, 1980.
Specifically, you stated that you plan to modify the scope and examination techniques previously used to perform inspections of the core spray internal piping and spargers.
The modification would follow the industry guidance contained in the BWR Vessel and Internals Project document, "Core Spray Internals Inspection and Flaw Evaluation Guidelines" (BWRVIP-18), dated July 26, 1996.
Using the BWRVIP-18 guidance for the inspection and scope of the core spray internal downcomer piping and spargers, a baseline inspection of all welds in the downcomer piping will be performed using enhanced VT-1 for NMPl which is capable of achieving a resolution of 0.0005 inches (0.0127 mm).
For the
- spargers, a baseline inspection of welds at locations Sl, S2, and S4 using CS VT-1 which is capable of achieving a resolution of 0.001 inches (0.0254 mm) will be used.
For welds at locations S3 and SB, a VT-3 inspection will be used.
Except for the welds at S3 and SB, the proposed inspection methods for the core spray internal downcomer piping and spargers are equivalent to, or more stringent than, those recommended in IEB 80-13.
The use of a VT-3 inspection for welds at S3 and SB was determined to'e acceptable per BWRVIP-18.
Because the proposed inspection methods focus on areas of the core spray piping and spargers which are more likely to experience intergranular stress corrosion cracking, the NRC staff finds that the scope and inspection methods used for the inspection of the core spray internal piping and spargers at NMPl are acceptable for this outage.
The NRC staff review of your January 29, 1997, letter is limited to your planned activities for the NMP1 spring 1997 outage.
As you know, the NRC staff is presently reviewing the generic acceptability of BWRVIP-18. If the NRC staff's further generic review of BWRVIP-18 should reveal
- concerns, then licensees who intend to follow the BWRVIP-18 guidance in the future may be requested to address these concerns on a plant-specific basis.
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9702250099 970220 PDR ADQCK 05000220 6
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B. Ralph Sylvia February 20, 1997 If you have questions regarding this letter, contact me at (301) 415-3049 or via e-mail at dsh8nrc.gov.
Sincerely, Docket No. 50-220 cc:
See next page
'arl Hood, Senior Project Hanager Project DIrectorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation DISTRIBUTION:
Docket File PUBLIC PDI-1 Reading SVarga JZwolinski SBajwa SLittle DHood OGC ACRS CCowgill, RI DOCUHENT NAME: NH195100. LTR To receive a copy of this document, indicate in the box:
"C" = Copy without attachment/enclosure "f" = Co y ith attachment/enclosure, "N" = No co y OFFICE PH:PDI-1 IIAHE DHood:nw DATE 02/
/97 E
LA:PDI-SLitt 02/
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B. Ralph Sylvia If you have questions regarding this letter, contact me at (301) 415-3049 or via e-mail at dsh8nrc.gov.
Sincerely,
@Ment~
'arl Hood, Senior Project Hanager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-220 cc:
See next page
B. Ralph Sylvia Niagara Mohawk Power Corporation Nine Mile Point Nuclear Station Unit No.
1 CC:
Hr. Richard B. Abbott Vice President and General Hanager-Nuclear 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 Nile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Hs. Denise J. Wolniak Manager Licensing Niagara Mohawk Power Corporation Nine Nile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Mr. Kim A. Dahlberg General Manager Projects Niagara Hohawk Power Corporation Nine Nile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093 Hr. Norman L. Rademacher Plant Manager, Unit 1
Nine Mile Point Nuclear Station P.O.
Box 63
- Lycoming, NY 13093
~
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 Hr. Paul D.
Eddy State of New York Department of Public Service Power Division, System Operations 3 Empire State Plaza
- Albany, NY 12223 Hr. F. William Valentino, President New York State
- Energy, Research, and Development Authority Corporate Plaza West
- 286 Washington Avenue Extension
- Albany, NY 12203-6399 Hark J. Wetterhahn, Esquire Winston 5 Strawn 1400 L Street, NW Washington, DC 20005-3502 Gary D. Wilson, Esquire Niagara Mohawk Power Corporation 300 Erie Boulevard West
- Syracuse, NY 13202 Supervisor Town of Scriba Route 8, Box 382
- Oswego, NY 13126
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