ML11269A014

Request for Additional Information for the Review of the Columbia Generating Station, License Renewal Application Regarding Upper Shelf Energy

ML11269A014
Person / Time
Site:	Columbia
Issue date:	09/26/2011
From:	Cunanan A License Renewal Projects Branch 1
To:	Swank D Energy Northwest
Cunanan A
References
TAC ME3058
Download: ML11269A014 (4)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555*0001 September 26, 2011 Mr. David A. Swank, Vice President of Engineering Columbia Generating Station Energy Northwest MD PE23 P.O. Box 968 Richland, WA 99352

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION, LICENSE RENEWAL APPLICATION REGARDING UPPER SHELF ENERGY (TAC NO. ME3058)

Dear Mr. Swank:

By letter dated January 19, 2010, Energy Northwest submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew operating license NPF-21 for Columbia Generating Station, for review by the U.S. Nuclear Regulatory Commission (NRC or the staff). The staff is reviewing the information contained in the license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review. Further requests for additional information may be issued in the future.

Items in the enclosure were discussed with Abbas Mostala and a mutually agreeable date for the response is within 45 days from the date of this letter. If you have any questions, please contact me at 301-415-3897 or bye-mail at arthur.cunanan@nrc.gov.

Sincerely, Arthur D. Cunanan, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-397

Enclosure:

As stated cc w/encl: Listserv

COLUMBIA GENERATING STATION LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION RAI4.2-7

Background:

The applicant stated in its response to RAI 4.2-6, dated April 22, 2011, that the N 12 nozzles are fabricated from SA-508 Class 1 material. The unirradiated (initial) transverse upper shelf energy (USE) of 62 ft-Ib and copper content of 0.27 percent used in the calculation of projected USE for the N12 nozzles are based on the results of a statistical analysis.

The regulatory guide 1.99 Rev. 2 decrease in USE projected to 54 EFPY for the N12 nozzles is 18 percent. This results in a USE projected to 54 EFPY of 51 ft-Ib for the limiting N12 forging.

Therefore, the applicant stated that the 10 CFR 50 Appendix G requirement for 50 ft-Ib minimum USE at end of vessel life is met for the current license period and for the period of extended operation for the N12 forgings.

Issue:

The applicant did not provide a technical basis for initial USE values of 62 ft-Ib and copper content of 0.27 percent for SA-508 Class 1 forgings material.

Reguest:

Provide a technical basis. submitted on the docket. for initial USE values of 62 ft-Ib and copper content of 0.27 percent for SA-508 Class 1 forgings material, which can be verified by the staff, in order for the applicant to demonstrate that the USE value for the N12 nozzle forgings will not pass below 50 ft-Ibs prior to the period of extended operation.

ENCLOSURE

ML11269A014

"'concurrence via e*mail OFFICE PM:RPB1 :DLR BC:RPB1 :DLR PM:RPB1 :DLR NAME ACunanan DMorey ACunanan DATE 09/26/2011 09/26/2011 09/26/2011

Letter to David A. Swank from Arthur D. Cunanan dated September 26, 2011 SUB..IECT:

REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE COLUMBIA GENERATING STATION, LICENSE RENEWAL APPLICATION REGARDING UPPER SHELF ENERGY (TAC NO. ME3058)

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