ML091330014

Generic Letter 2004-02 Supplemental Response

ML091330014
Person / Time
Site:	Prairie Island
Issue date:	06/01/2009
From:	Thomas Wengert Plant Licensing Branch III
To:	Wadley M Northern States Power Co
Wengert, Thomas NRR/DORL 415-4037
References
GL-04-002, TAC MC4707, TAC MC4708
Download: ML091330014 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 1, 2009 Mr. Michael D. Wadley Site Vice President Prairie Island Nuclear Generating Plant Northern States Power - Minnesota 1717 Wakonade Drive East Welch, MN 55089

SUBJECT:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT, UNITS 1 AND 2 - GENERIC LETTER 2004-02 SUPPLEMENTAL RESPONSE (TAC NOS. MC4707 AND MC4708)

Dear Mr. Wadley:

By letters dated February 28, 2008 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML080590629) and March 31,2008 (ADAMS Accession No. ML080920532), you submitted supplemental responses to Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors," for Prairie Island Nuclear Generating Plant, Units 1 and 2 (PINGP). We have reviewed your submittals with a process that involved a detailed review by a team of 10 subject matter experts, with focus on the review areas described in the U.S. Nuclear Regulatory Commission's (NRC's) "Revised Content Guide for Generic Letter 2004-02 Supplemental Responses" (ADAMS Accession No. ML073110389). The review process also included a separate "holistic" review of your submittals informed by inputs from the subject matter experts that focused on whether you have demonstrated overall that your corrective actions for Generic Letter 2004-02 are adequate.

We have no further questions at this time regarding your completion of corrective actions for GL 2004-02. In large part this conclusion is based on the very low potential debris loading at PINGP, as discussed in your supplemental responses.

As you may be aware, we have not yet issued a final safety evaluation (SE) on WCAP 16793 NP, "Evaluation of Long-Term Cooling Considering Particulate, Fibrous, and Chemical Debris in the Recirculating Fluid." We believe that the likelihood of unacceptable in-vessel debris impact for PINGP is very low because of the low debris loading. However, because your GL 2004-02 response refers to and relies on this topical report, we plan to defer issuance of a closure letter to PINGP for the GL until uncertainties regarding the remaining issues with WCAP 16793 are reduced. You may wait for the issue to be resolved through the WCAP process or may demonstrate that in-vessel downstream effects issues are resolved for PINGP by demonstrating without reference to WCAP-16793 or the NRC staff SE that in-vessel downstream effects have been addressed at PINGP.

M. Wadley

- 2 If you have any questions regarding this matter, please contact me at (301) 415-4037.

Sincerely, Thomas J. We I Senior Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-282 and 50-306 cc: Distribution via ListServ

M. Wadley

-2 If you have any questions regarding this matter, please contact me at (301) 415-4037.

Sincerely, IRA!

Thomas J. Wengert, Senior Project Manager Plant Licensing Branch 111-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-282 and 50-306 cc: Distribution via ListServ DISTRIBUTION PUBLIC LPL3-1 rtf RidsNrrDorlLpl3-1 Resource RidsNrrDssSsib Resource RidsNrrPMPrairielsland Resource RidsNrrLABTully Resource RidsOgcRp Resource RidsAcrsAcnw MailCTR Resource RidsRgn3MailCenter Resource RidsNrrDciCsgb Resource RArchitzeI, NRR ADAMS Accession: ML091330014 OFFICE NRRiLPL3-1/PM NRRlLPL3-1/LA NRRlDSS/SSIB NRRlDSS/SSIB/BC NRRlDCI/CSGB/BC NRRlLPL3-1/BC NAME TWengert BTuily DHarrison MScott MGavrilas LJames DATE 05/15/09 05/13/09 05/20109 05/26/09 05/28/09 06/01/09 OFFICIAL RECORD COPY