ML033500187
| ML033500187 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 12/04/2003 |
| From: | Donohew J NRC/NRR/DLPM/LPD4 |
| To: | Muench R Wolf Creek |
| Donohew J N, NRR/DLPM,415-1307 | |
| References | |
| TAC MB7164 | |
| Download: ML033500187 (4) | |
Text
December 4, 2003 Mr. Rick A. Muench President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, KS 66839
SUBJECT:
WOLF CREEK GENERATING STATION - EVALUATION OF RESULTS OF INSERVICE INSPECTIONS OF STEAM GENERATORS IN 2002 REFUELING OUTAGE (TAC NO. MB7164)
Dear Mr. Muench:
By letters dated April 21, 2002 (ET 02-0019) and December 11, 2002 (ET 02-0046), you submitted reports summarizing the results of the steam generator (SG) tube inspections performed during the 2002 refueling outage for the Wolf Creek Generating Station (WCGS).
By letter dated July 23, 2003 (ET 03-0003), you responded to the staffs request for additional information pertaining to the reports.
WCGS has four Westinghouse Model F SGs, each of which has 5626 thermally-treated Alloy 600 tubes. The tubes have an outside diameter of 0.688-inch, a wall thickness of 0.040-inch and are supported by stainless steel tube supports with quatrefoil-shaped holes and V-shaped chrome plated Alloy 600 anti-vibration bars (AVBs).
During the 2002 SG tube inspection, Wolf Creek Nuclear Operating Corporation (WCNOC) performed tube inspections in SGs B and C. The scope and results of the inspections are provided in the above letters. WCNOC stated it plugged six tubes in SG B and three tubes in SG C. One tube in SG B was plugged due to a single circumferential anomaly and the remaining tubes in both SGs were plugged due to AVB wear that exceeded the tube plugging limit. The circumferential anomaly was inspected using an ultrasonic technique (UT) and WCNOC concluded no crack-like indications were present. WCNOC detected a wear indication at a cold leg tube support in addition to the indications of wear at the AVBs. WCNOC indicated that the cold leg wear indication was likely the result of a loose part, although it stated that no loose part was identified at this location.
During their 1999 SG tube inspection and again in 2002, the licensee detected a number of volumetric indications near the top of the tubesheet on the hot leg side. These indications were reported as "wear like" and the through-wall depth detected in both outages has not changed significantly. One of these indications was inspected by UT and was confirmed to be a volumetric indication. The licensee indicated that the UT results support their interpretation that these indications are volumetric and are not crack or crack precursor signals.
R. Muench Based on the staffs review of the above information provided by WCNOC, the staff concludes that the information required to be submitted by the technical specifications was provided and that no additional follow-up is required at this time. This closes out the subject TAC.
Sincerely,
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-482 cc: See next page
R. Muench Based on the staffs review of the above information provided by WCNOC, the staff concludes that the information required to be submitted by the technical specifications was provided and that no additional follow-up is required at this time. This closes out the subject TAC.
Sincerely,
/RA/
Jack Donohew, Senior Project Manager, Section 2 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-482 cc: See next page DISTRIBUTION PUBLIC PDIV-2 Reading RidsNrrDlpmPdiv(HBerkow)
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LLund Martin Murphy
- See memorandum dated October 1, 2003 ACCESSION NO.: ML033500187 NRR-106 OFFICE PDIV-2/PM PDIV-2/LA EMCB/SC PDIV-2/SC NAME JDonohew EPeyton LLund*
SDembek DATE 12/4/03 12/4/03 10/01/2003 12/4/03 DOCUMENT NAME: C:\\ORPCheckout\\FileNET\\ML033500187.wpd OFFICIAL RECORD COPY
Wolf Creek Generating Station cc:
Jay Silberg, Esq.
Shaw, Pittman, Potts & Trowbridge 2300 N Street, NW Washington, D.C. 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 P.O. 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 S.W. 10th Avenue, 2nd Floor Topeka, KS 66612-1597 County Clerk Coffey County Courthouse 110 South 6th Street Burlington, KS 66839 Vick L. Cooper, Chief Air Operating Permit and Compliance Section Kansas Department of Health and Environment Bureau of Air and Radiation 1000 SW Jackson, Suite 310 Topeka, KS 66612-1366 Site Vice President Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KS 66839 Superintendent Licensing Wolf Creek Nuclear Operating Corporation P.O. Box 411 Burlington, KS 66839 U.S. Nuclear Regulatory Commission Resident Inspectors Office 8201 NRC Road Steedman, MO 65077-1032