ML20202J142
| ML20202J142 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/22/1999 |
| From: | Carpenter C NRC (Affiliation Not Assigned) |
| To: | Richard Anderson NORTHERN STATES POWER CO. |
| Shared Package | |
| ML20202J147 | List: |
| References | |
| TAC-MA4254, TAC-MA4255, NUDOCS 9902090049 | |
| Download: ML20202J142 (2) | |
Text
January 22, 1999 1
Mr. Rog::r O. And:rson, Director Nucl:ar Energy Engineering Northern States Power Company 414 Nicollet Mall Minneapo!:s, MN 55401
SUBJECT:
PRAIRIE ISLAND NUCLEAR GENERAT!NG PLANT - EVALUATION OF REQUEST FOR APPROVAL OF AN ALTERNATIVE TO THE ASME CODE ON SURFACE EXAMINATION AND WELD OVERLAY OF CANOPY SEAL WELDS FOR CONTROL ROD DRIVE MECHANISM (TAC NOS. MA4254 AND MA4255)
Dear Mr. Anderson:
By letter dated November 30,1998, Northern States Power Company (NSP) proposed an alternative to the surface examination requirements of paragraph N-518.4 of the 1968 American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code for control rod drive mechanism canopy seal welds. In lieu of the liquid penetrant surface examination required by the ASME Boiler and Pressure Vessel Code, the proposed alternative is to make weld repair / overlays using an automatic welding process with visual examinations of the weld area with a remote video camera and a post-outage system leakage test inspection. The proposed alternativs would be used in the examination of one canopy seal weld repair and in the examinations of weld overlays applied on other non-repaired canopy seal welds.
The staff has reviewed the NSP's proposed alternative and concludes that the proposed alternative provides an acceptable level of quality and cafety. Therefore, pursuant to 10 CFR 50.55a(a)(3)(i), the staff authorizes the use of the proposed alternative. The detailed results of the staff review are provided in the enclosed safety evaluation. If you have any questions concerning this action please call T. J. Kim of my staff at (301) 415-1392.
Sincerely, ORIGINAL SIGNED BY Cynthia A. Carpenter, Director Project Directorate 111-1 Division of Reactor Projects -lil/!V Office of Nuclear Reactor Regulation
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Docket Nos. 50-282 and 50-306
Enclosure:
Safety Evaluation oi cc w/ encl: See next page DISTRIBUTION:
Docket File EAdensam (EGA1)
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. DNaujock DOCUMENT NAME: G:\\WPDOCS\\ PRAIRIE \\RLF4254.WPD
- No significant changes to SE To receive a copy of this document, Indicate in the box: "C' = Copy withod attachmont/ enclosure
- E' = Copy witn attachment / enclosure *N* = No copy
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NAME TJKim:dbTK CJamerson G/ ESullivan*
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2 OFFidAL RECORD COPY 9902090049 990122 PDR ADOCK 05000282 P
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Mr. Roger O. Anderson, Director.
Prairie Island Nuclear Generating Northern States Power Company Plant l
cc:
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. J. E. Silberg, Esquire Site Licensing Shaw, Pittman, Potts and Trowbridge Prairie Island Nuclear Generating 2300 N Street, N. W.-
Plant Washington DC 20037 Northern States Power Company 1717 Wakonade Drive East Plant Manager Welch, Minnesota 55089 Prairie Island Nucitar Generating -
Plant Tribal Council -
Northern States Power Company Prairie Island Indian Community 1717 Wakonade Drive East ATTN: EnvironmentalDepartment Welch, Minnesota 55089 5636 Sturgeon Lake Road Welch, Minnesota 55069 Adonis A. Nebiett c Assistant Attorney General.
Office of the Attorney General
- 455 Minnesota Street
. Suite 900 St. Paul, Minnesota 55101-2127 U.S. Nuclear Regulatory Commission
- Resident inspector's Office 1719 Wakonade Drive East Welch, Minnesota 55089-9642 Regional Administrator, Region 111 l
U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, Illinois. 60532-4351 -
Mr. Stephen Bloom, Administrator Goodhue County Courthouse Box 408 Red Wing, Minr'esota 55066-0408 Kris Sanda, Commissioner.
Department of Public Service 121 Seventh Place East
. Suite 200
' St. Paul, Minnesota.55101-2145 i
)
June 1998
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