ML080840288
| ML080840288 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 03/31/2008 |
| From: | Kuo P NRC/NRR/ADRO/DLR |
| To: | Garrett T Wolf Creek |
| Tran T, NRR/RPB2, 415-3617 | |
| References | |
| TAC MD3181 | |
| Download: ML080840288 (5) | |
Text
March 31, 2008 Mr. Terry J. Garrett Vice President, Engineering Wolf Creek Nuclear Operating Corporation 1550 Oxen Lane, NE Burlington, KS 66839
SUBJECT:
SCHEDULE FOR COMPLETION OF WOLF CREEK GENERATING STATION LICENSE RENEWAL REVIEW, TAC NO. MD3181
Dear Mr. Garrett:
This letter is to inform you of revisions to the Wolf Creek Generating Station (WCGS) license renewal review schedule. Additional time has been requested by your staff in order to prepare submittals to address open items contained in the safety evaluation report (SER) with open items issued February 1, 2008. On the currently posted schedule, the WCGS SER is scheduled to be issued June 30, 2008. As a result of discussions with your staff, this date will be pushed back to July 29, 2008, to accommodate a May 1, 2008, public meeting to discuss the open items with you, and a subsequent May 15, 2008, submittal from you regarding the open items.
The Advisory Committee on Reactor Safeguards (ACRS) full committee meeting would still be scheduled for the original tentative date of September 4, 2008. These revised dates have been proposed by your staff to resolve conflicts that would be present if the meeting and submittal were scheduled earlier, because of your current outage activity.
It is important for you to note that failure to meet the dates in this revised schedule with acceptable responses to the open items would require a change to the ACRS full committee meeting, and would likely impact the later dates in the schedule, as well.
At this time, there are two sets of open items that do not currently have a clear resolution path.
One is related to the scoping performed for station blackout (SBO) recovery, and the other is tied to the fatigue analyses performed for the metal fatigue time-limited aging analysis (TLAA).
During the March 5, 2008 meeting, the ACRS subcommittee convened to discuss the safety evaluation with open items. During the meeting, the staff reiterated its position on (a) Station Blackout Interim Staff Guidance and (b) how the environmentally assisted fatigue (EAF) analysis of NUREG/CR-6260 locations should be performed.
The staff has concluded that the WCGS scoping for the electric power systems must address the SBO recovery paths that will be age-managed, and that additional components will be required to be included within the scope of license renewal. In order to close this open item, the staff must receive an acceptable response that addresses this concern.
T. Garrett
The staffs expectation for the EAF analyses is that WCGS will provide the staff with the results for the analysis of the following NUREG/CR-6260 locations: Surge Line highest-CUF location (hot leg nozzle), Charging Nozzle (normal loop 1, alternative loop 4), Safety Injection (BIT)
Nozzles, and Accumulator and RHR Cold Leg Safety Injection Nozzles. These will be submitted to NRC prior to closure of these SER open items. WCGSs current analysis using the so-called virtual stress is not acceptable to meet the ASME Code. The staff requests WCGS to perform finite-element stress analyses by using NRC approved software and the ASME Code,Section III, Subsection NB-3200 methodology (which defines the use of six stress components to determine the stress state and thereby calculates the principal stresses and stress intensities).
The analyses shall not apply the transfer function method unless it is based on six stress components. In addition, the analyses are expected to justify (a) the analysis method used, (b) the load (stress) combination, and (c) the results of the ASME Code analysis if 2-D axis-symmetric modeling is used.
If you have any questions, please contact Tam Tran of my staff at 301-415-3617 or e-mail TXT1@nrc.gov.
Sincerely,
\\RA Sam Lee For \\
Pao-Tsin Kuo, Director Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-482 cc: See next page
ML080840288 Letter to T. Garrett from T. Tran, dated March 31, 2008 DISTRIBUTION:
SUBJECT:
SCHEDULE FOR COMPLETION OF WOLF CREEK GENERATING STATION LICENSE RENEWAL REVIEW, TAC NO. MD3181 HARD COPY:
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Wolf Creek Generating Station cc:
Jay Silberg, Esq.
Pillsbury Winthrop Shaw Pittman, LLP 2300 N Street, NW Washington, DC 20037 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-7005 Senior Resident Inspector U.S. Nuclear Regulatory Commission PO Box 311 Burlington, KS 66839 Chief Engineer, Utilities Division Kansas Corporation Commission 1500 SW Arrowhead Road Topeka, KS 66604-4027 Office of the Governor State of Kansas Topeka, KS 66612 Attorney General 120 SW 10th Avenue, 2nd Floor Topeka, KS 66612-1597 County Clerk Coffey County Courthouse 110 South 6th Street Burlington, KS 66839 Thomas A. Conley, Section Chief Radiation and Asbestos Control Kansas Department of Health and Environment Bureau of Air and Radiation 1000 SW Jackson, Suite 310 Topeka, KS 66612-1366 Vice President Operations/Plant Manager Wolf Creek Nuclear Operating Corporation PO Box 411 Burlington, KS 66839 Supervisor Licensing Wolf Creek Nuclear Operating Corporation PO Box 411 Burlington, KS 66839 U.S. Nuclear Regulatory Commission Resident Inspectors Office/Callaway Plant 8201 NRC Road Steedman, MO 65077-1032 Kevin J. Moles, Manager Regulatory Affairs Wolf Creek Nuclear Operating Corporation PO Box 411 Burlington, KS 66839 Lorrie I. Bell, Project Manager Wolf Creek Nuclear Operating Corporation PO Box 411 Burlington, KS 66839 Mr. Gordon A. Clefton Nuclear Energy Institute 1776 I Street, NW, Suite 400 Washington, DC 20006-3708