ML083580098

Request for Additional Information Related to License Amendment Request for Technical Specifications Changes to Allow Use of Westinghouse 0.422-Inch OD 14X14 Vantage + Fuel (TAC Nos. MD9142/9143)

ML083580098
Person / Time
Site:	Prairie Island
Issue date:	01/12/2009
From:	Thomas Wengert Plant Licensing Branch III
To:	Wadley M Northern States Power Co
Wengert, Thomas J, NRR/DORL, 415-4037
References
TAC MD9142, TAC MD9143
Download: ML083580098 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 January 12, 2009 Mr. Michael D. Wadley Site Vice President Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota 1717 Wakonade Drive East Welch, MN 55089

SUBJECT:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR TECHNICAL SPECIFICATIONS CHANGES TO ALLOW USE OF WESTINGHOUSE 0.422-INCH 00 14X14 VANTAGE+ FUEL (TAC NOS. MD9142 AND MD9143)

Dear Mr. Wadley:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated June 26, 2008, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML081820137), as supplemented by letters dated August 4, (ADAMS Accession No. ML082210260), August 26, (ADAMS Accession No. ML082400518), and November 14, 2008, (ADAMS Accession No. ML083190820), Nuclear Management Company, LLC, a predecessor license holder to the Northern States Power Company, a Minnesota Corporation, submitted a request for Technical Specification changes to allow the use of Westinghouse 0.422-inch outside diameter 14X14 VANTAGE+ fuel for Prairie Island Nuclear Generating Plant, Units 1 and 2.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on December 19, 2008, it was agreed that you would provide a response within 30 days of this letter.

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 NRC's 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) 415-4037.

Sincerely, Thomas J. Wengert, Senior Pro' Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-282 and 50-306

Enclosure:

Request for Additional Information cc w/encl: Distribution via ListServ

REQUEST FOR ADDITIONAL INFORMATION PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 DOCKET NOS. 50-282 AND 50-306 In reviewing the Nuclear Management Company, LLC', submittal dated June 26, 2008 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML081821037), as supplemented by letters dated August 4 (ADAMS Accession No. ML082210260), August 26 (ADAMS Accession No. ML082400518), and November 14, 2008 (ADAMS Accession No. ML083190820), which requested technical specification changes related to a change in fuel type from Westinghouse OAOO-inch outside diameter (OD) Vantage+

(400V+) fuel to Westinghouse OA22-inch OD Vantage+ (422V+) fuel for Prairie Island Nuclear Generating Plant, Units 1 and 2 (PINGP), the U.S. Nuclear Regulatory Commission (NRC) staff has determined that further clarification of the November 14, 2008, request for additional information (RAI) response is needed in order to complete its review. The same RAI numbering used in the November 14, 2008, RAI response is referenced for tracking purposes.

2. The Revised Thermal Design Procedure (RTDP) combines uncertainties in a way that is somewhat different from the way proposed in this license amendment request, which reduces the assumed uncertainty and recovers it by assuming a bounding power level. Please show this treatment is acceptably conservative by providing comparative data. Compare the Design Limit departure from nucleate boiling ratio (DNBR) for PINGP using the traditional RTDP to that obtained using the bounding power level assumption with a reduced uncertainty. Also, compare the DNBR results for the limiting DNBR transient using the RTDP analytic process and using the bounding power level assumption with a reduced uncertainty.

5b. The licensing report did not seem to indicate clearly that two separate transients had been analyzed. The NRC staff requests NSPM to distinguish between the two.

6. The NRC staff requests NSPM to provide additional information concerning the core flow rates, the injection source assumed to be providing the diluting flow, and the total reactor coolant system (RCS) volume to justify the use of total RCS volume as a figure of merit, as opposed to the core coolant volume, as requested by the staff. Noting that the RCS configuration may change depending on the Operating Mode, the staff requests NSPM to consider all modes for the potential for an impact on the boron dilution analysis when preparing its response.

• On September 22, 2008, Nuclear Management Company, LLC (NMC), transferred its operating authority to Northern States Power Company, a Minnesota Corporation (NSPM). By letter dated September 3, 2008, NSPM stated that it would assume responsibility for actions and commitments submitted by NMC.

ENCLOSURE

Mr. Michael D. Wadley Site Vice President Prairie Island Nuclear Generating Plant Northern States Power Company - Minnesota 1717 Wakonade Drive East Welch, MN 55089

SUBJECT:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 REQUEST FOR ADDITIONAL INFORMATION RELATED TO LICENSE AMENDMENT REQUEST FOR TECHNICAL SPECIFICATIONS CHANGES TO ALLOW USE OF WESTINGHOUSE 0.422-INCH 00 14X14 VANTAGE+ FUEL (TAC NOS. MD9142 AND MD9143)

Dear Mr. Wadley:

By letter to the U.S. Nuclear Regulatory Commission (NRC) dated June 26, 2008, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML081820137), as supplemented by letters dated August 4, (ADAMS Accession No. ML082210260), August 26, (ADAMS Accession No. ML082400518), and November 14, 2008, (ADAMS Accession No. ML083190820), Nuclear Management Company, LLC, a predecessor license holder to the Northern States Power Company, a Minnesota Corporation, submitted a request for Technical Specification changes to allow the use of Westinghouse 0.422-inch outside diameter 14X14 VANTAGE+ fuel for Prairie Island Nuclear Generating Plant, Units 1 and 2.

The NRC staff is reviewing your submittal and has determined that additional information is required to complete the review. The specific information requested is addressed in the enclosure to this letter. During a discussion with your staff on December 19, 2008, it was agreed that you would provide a response within 30 days of this letter.

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 NRC's 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) 415-4037.

Sincerely, IRAJ Thomas J. Wengert, Senior Project Manager.

Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-282 and 50-306

Enclosure:

Request for Additional Information cc w/encl: Distribution via ListServ DISTRIBUTION:

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