ML050250246
| ML050250246 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 01/31/2005 |
| From: | Mahesh Chawla NRC/NRR/DLPM/LPD3 |
| To: | Solymossy J Nuclear Management Co |
| Chawla M, 415-8371, NRR/DLPM | |
| References | |
| TAC MC3043, TAC MC3044 | |
| Download: ML050250246 (4) | |
Text
January 31, 2005 Mr. Joseph M. Solymossy Site Vice President Prairie Island Nuclear Generating Plant Nuclear Management Company, LLC 1717 Wakonade Drive East Welch, MN 55089
SUBJECT:
PRAIRIE ISLAND NUCLEAR GENERATING PLANT (PRAIRIE ISLAND),
UNITS 1 AND 2 - REQUEST FOR ADDITIONAL INFORMATION (RAI) -
LICENSE AMENDMENT REQUEST (LAR) FOR RESOLUTION OF UNRESOLVED ITEMS RELATED TO METHODS FOR EVALUATION OF COOLING WATER SYSTEM (TAC NOS. MC3043 AND MC3044)
Dear Mr. Solymossy:
For the above referenced LAR, the initial RAI was sent to you via e-mail on 12/8/04. On January 12, 2005, a follow-up telephone conference was held between Prairie Island representatives and the U. S. Nuclear Regulatory Commission (NRC) staff, during which the initial RAI was discussed in more detail. As a result of this discussion, your representatives agreed to provide response to the enclosed NRC staff questions by February 11, 2005. If you have any further questions, please feel free to contact me at 301-415-8371.
Sincerely,
/RA/
Mahesh L. Chawla, Project Manager, Section 1 Project Directorate III Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket Nos. 50-282 and 50-306
Enclosure:
Request For Additional Information cc w/encls: See next page
ML050250246 Nrr-088 OFFICE PDIII-1/PM PDIII-1/LA SPLB/SC IROB/SC EMEB/SC PDIII-1/SC NAME MChawla THarris SJones DTrimble KManoly LRaghavan DATE 01/27/05 01/27/05 01/27/05 01/31/05 01/28/05 01/31/05
ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION RELATED TO METHODS FOR EVALUATION OF COOLING WATER SYSTEM PRAIRIE ISLAND NUCLEAR GENERATING PLANT UNIT 1 AND 2
- 1) You indicated that the evaluation applies acceptance criteria from American Society of Mechanical Engineers (ASME)Section III, Subsection ND, Service Level D when performing stress analyses of the cooling water (CL) system non-Class I piping with design-basis seismic loads. The proposed methodology and acceptance criteria provide a conservative approach for demonstrating that the CL system will perform its safety function following a design-basis seismic event. Provide a description of analysis including the methodology, loss-of-coolant accident loads for the faulted condition, load combinations, input response spectra to the seismic analysis, modeling and computer code used, assumptions and resulting stresses in comparison against the code allowable limits.
- 2) Though Nuclear Regulatory Commission (NRC) is reviewing the criteria for analyzing CL system non-seismic piping, confirm that the piping will continue to be protected from the failure of non-seismic structures, systems and components in accordance with the existing plant licensing basis. Please explain any exceptions.
- 3) The licensee proposes to credit automatic isolation valves for excluding CL system non-seismic piping from consideration. Confirm that these valves are seismic Category I, safety-related valves, which will automatically actuate to close during a seismic event, and that the single-failure criterion will be satisfied.
- 4) Explain in detail specific operator actions that are being relied upon for postulated pipe break conditions for NRC assessment of human factors considerations.
Prairie Island Nuclear Generating Plant, Units 1 and 2 cc:
Jonathan Rogoff, Esquire Vice President, Counsel & Secretary Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Manager, Regulatory Affairs Prairie Island Nuclear Generating Plant Nuclear Management Company, LLC 1717 Wakonade Drive East Welch, MN 55089 Manager - Environmental Protection Division Minnesota Attorney Generals Office 445 Minnesota St., Suite 900 St. Paul, MN 55101-2127 U.S. Nuclear Regulatory Commission Resident Inspector's Office 1719 Wakonade Drive East Welch, MN 55089-9642 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 801 Warrenville Road Lisle, IL 60532-4351 Administrator Goodhue County Courthouse Box 408 Red Wing, MN 55066-0408 Commissioner Minnesota Department of Commerce 85 7th Place East, Suite 500 St. Paul, MN 55101-2198 Tribal Council Prairie Island Indian Community ATTN: Environmental Department 5636 Sturgeon Lake Road Welch, MN 55089 Nuclear Asset Manager Xcel Energy, Inc.
414 Nicollet Mall, R.S. 8 Minneapolis, MN 55401 John Paul Cowan Executive Vice President & Chief Nuclear Officer Nuclear Management Company, LLC 700 First Street Hudson, WI 54016 Craig G. Anderson Senior Vice President, Group Operations Nuclear Management Company, LLC 700 First Street Hudson, WI 54016