ML080950360
| ML080950360 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 04/07/2008 |
| From: | Lyon C NRC/NRR/ADRO/DORL/LPLIV |
| To: | Minahan S Nebraska Public Power District (NPPD) |
| Lyon C Fred, NRR/DORL/LPL4, 301-415-2296 | |
| References | |
| TAC MD8025 | |
| Download: ML080950360 (5) | |
Text
April 7, 2008 Mr. Stewart B. Minahan Vice President-Nuclear and CNO Nebraska Public Power District 72676 648A Avenue Brownville, NE 68321
SUBJECT:
COOPER NUCLEAR STATION - REQUEST FOR ADDITIONAL INFORMATION RE: RELIEF REQUEST RI-35 (TAC NO. MD8025)
Dear Mr. Minahan:
By application dated January 30, 2008, as supplemented by letter dated March 27, 2008, Nebraska Public Power District (the licensee) requested the U.S. Nuclear Regulatory Commission (NRC) staff authorization to use an alternative to certain inservice inspection code requirements for the Cooper Nuclear Station. Specifically, Relief Request RI-35 proposed alternatives to the dissimilar metal weld repair requirements of Section XI of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code.
The NRC staff has reviewed the information provided in your supplement and determined that additional information is required in order to complete its review. Please provide a response to the enclosed questions by April 11, 2008.
The NRC staff considers that timely responses to requests for additional information help ensure sufficient time is available for staff review and contribute toward the NRCs goal of efficient and effective use of staff resources. If circumstances result in the need to revise the requested response date, please contact me at (301) 415-2296.
Sincerely,
/RA/
Carl F. Lyon, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-298
Enclosure:
Request for Additional Information cc w/encl: See next page
(*)email dated OFFICE NRR/LPL4/PM NRR/LPL4/LA DCI/CVIB/BC NRR/LPL4/BC NAME FLyon JBurkhardt MMitchell (*)
THiltz DATE 4/4/08 4/4/08 4/4/08 4/7/08
Cooper Nuclear Station (09/2007) cc:
Mr. Ronald D. Asche President and Chief Executive Officer Nebraska Public Power District 1414 15th Street Columbus, NE 68601 Mr. Gene Mace Nuclear Asset Manager Nebraska Public Power District P.O. Box 98 Brownville, NE 68321 Mr. John C. McClure Vice President and General Counsel Nebraska Public Power District P.O. Box 499 Columbus, NE 68602-0499 Mr. David Van Der Kamp Licensing Manager Nebraska Public Power District P.O. Box 98 Brownville, NE 68321 Mr. Michael J. Linder, Director Nebraska Department of Environmental Quality P.O. Box 98922 Lincoln, NE 68509-8922 Chairman Nemaha County Board of Commissioners Nemaha County Courthouse 1824 N Street Auburn, NE 68305 Ms. Julia Schmitt, Manager Radiation Control Program Nebraska Health & Human Services R & L Public Health Assurance 301 Centennial Mall, South P.O. Box 95007 Lincoln, NE 68509-5007 Mr. H. Floyd Gilzow Deputy Director for Policy Missouri Department of Natural Resources P.O. Box 176 Jefferson City, MO 65102-0176 Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 218 Brownville, NE 68321 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Director, Missouri State Emergency Management Agency P.O. Box 116 Jefferson City, MO 65102-0116 Chief, Radiation and Asbestos Control Section Kansas Department of Health and Environment Bureau of Air and Radiation 1000 SW Jackson Suite 310 Topeka, KS 66612-1366 Ms. Melanie Rasmussen Radiation Control Program Director Bureau of Radiological Health Iowa Department of Public Health Lucas State Office Building, 5th Floor 321 East 12th Street Des Moines, IA 50319 Mr. Keith G. Henke, Planner Division of Community and Public Health Office of Emergency Coordination 930 Wildwood P.O. Box 570 Jefferson City, MO 65102 Mr. Paul V. Fleming, Director of Nuclear Safety Assurance Nebraska Public Power District P.O. Box 98 Brownville, NE 68321 Mr. John F. McCann, Director Licensing, Entergy Nuclear Northeast Entergy Nuclear Operations, Inc.
440 Hamilton Avenue White Plains, NY 10601-1813
OFFICE OF NUCLEAR REACTOR REGULATION REQUEST FOR ADDITIONAL INFORMATION RELATED TO RELIEF REQUEST RI-35 NEBRASKA PUBLIC POWER DISTRICT COOPER NUCLEAR STATION DOCKET NO. 50-298 The Nuclear Regulatory Commission (NRC) staff has reviewed the Nebraska Public Power District (the licensee) March 27, 2008, Response To Request For Additional Information regarding Request RI-35, Revision 1, for the Cooper Nuclear Station (CNS) and has determined that additional information is necessary to complete the review of the licensees request for relief. Based on the staff=s review, please provide a response which addresses the following request for additional information questions.
- 1.
The licensee has stated that the weld overlay of the dissimilar metal welds may require welding on more than 300 square inches of surface on some of the materials shown in Table 1 of Request Number RI-35, Revision 1. Provide sketches and calculations to justify the basis for the maximum surface area of weld overlay for Component Numbers RAS-BF-1, RBS-BF-1, and RAS-BF-12 shown in Table 1 of Request Number RI-35, Revision 1.
- 2.
In Table 1 of Request Number RI-35, Revision 1, Material 1, for several components is shown as Nozzle: A-508 Class 2 CS. This implies that ASME SA-508 Class 2 is a carbon steel material (P-1 material). This is incorrect. ASME SA-508 Class 2 is a low-alloy steel material (P-3 material). As this clarification is important with respect to the qualification of the welding procedure which will be used to apply the weld overlay, please correct this discrepancy.
- 3.
In Table 1 of Request Number RI-35, Revision 1, one of the materials to be welded is shown as, Pipe: A-155 Class 1 CS. NRC cannot find a material with this class of A-155. Please identify the material designation of this material, including material type or class and year of this designation. As noted above, documentation of this information is significant with respect to ensuring proper qualification of the welding procedure which will be used to apply the weld overlay.
- 4.
The relief request states that full ultrasonic examination of the final weld surface and band area (1.5T width) will not be performed. Provide a sketch similar to Figure 1 in RI-35 to describe how much of the final weld surface and band area will be post-weld examined using the ultrasonic method and how much of the final weld surface and band area will be examined by the liquid penetrant method. Provide a detailed explanation for the basis that the liquid penetrant method can be substituted for the ultrasonic method in areas where the ultrasonic method will not be used.