ML050410310
| ML050410310 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 02/16/2005 |
| From: | Thadani M NRC/NRR/DLPM/LPD4 |
| To: | Blevins M TXU Generation Co, LP |
| Thadani M, NRR/DLPM, 415-1476 | |
| References | |
| TAC MC2993, TAC MC3738 | |
| Download: ML050410310 (5) | |
Text
February 16, 2005 Mr. Michael R. Blevins Senior Vice President &
Principal Nuclear Officer TXU Generation Company LP Attn: Regulatory Affairs Department P. O. Box 1002 Glen Rose, TX 76043 S
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION, UNIT 2 - STAFF ASSESSMENT OF THE STEAM GENERATOR TUBE INSPECTION REPORTS FOR THE SPRING 2002 REFUELING OUTAGE (2RFO6) AND FALL 2003 REFUELING OUTAGE (2RF07) (TAC NOS. MC2993 AND MC3738)
Dear Mr. Blevins:
By letters dated April 18, 2002, June 5, 2002, and July 17, 2002, TXU Generation Company, LP (TXU), the licensee for Comanche Peak Steam Electric Station (CPSES), Unit 2, summarized its spring 2002 refueling outage (2RF06 ) steam generator (SG) tube inservice inspection (ISI) for CPSES, Unit 2. By letters dated November 6, 2003, January 22, 2004, and June 30, 2004, TXU summarized its fall 2003 refueling outage (2RF07) SG tube ISI for CPSES, Unit 2. By letter dated October 14, 2004, the licensee responded to a request for additional information on these submittals.
The Nuclear Regulatory Commission (NRC) staff has assessed the licensees submittals and concludes that the licensee provided the information as required by its Technical Specifications.
In addition, the staff concludes that there are no technical issues that warrant follow-up action at this time since the inspections appear to be consistent with the objective of detecting potential tube degradation and the inspection results appear to be consistent with industry operating experience at similarly designed and operated units.
The NRC staffs assessment is enclosed.
If there are any questions regarding this assessment, please contact me at (301) 415-1476.
Sincerely,
/RA/
Mohan C. Thadani, Senior Project Manager, Section 1 Project Directorate IV Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-446
Enclosure:
As stated cc w/encl: See next page
- No significant change from input OFFICE PDIV-1/PM PDIV-1/LA EMCB/SC PDIV-1/SC NAME MThadani DBaxley LLund*
AHowe DATE 2/15/05 2/15/05 11/23/05 2/16/05
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STAFF ASSESSMENT BY THE OFFICE OF NUCLEAR REACTOR REGULATION COMANCHE PEAK STEAM ELECTRIC STATION, UNIT 2 TXU GENERATION COMPANY, LP SPRING 2002 AND FALL 2003 STEAM GENERATOR TUBE INSERVICE INSPECTIONS DOCKET NO. 50-446 By letters dated April 18, 2002 (ML021210473)1, June 5, 2002 (ML021640618), and July 17, 2002 (ML022060178), TXU Generating Company, LP (TXU), the licensee for Comanche Peak Steam Electric Station (CPSES), Unit 2, summarized its spring 2002 refueling outage (2RF06) steam generator (SG) tube inservice inspection (ISI) for CPSES, Unit 2. By letters dated November 6, 2003 (ML033180430), January 22, 2004 (ML040290102), and June 30, 2004 (ML041890306), TXU summarized its fall 2003 refueling outage (2RF07) SG tube ISI for CPSES, Unit 2. By letter dated October 14, 2004 (ML042930638), the licensee responded to the Nuclear Regulatory Commission staff request for additional information.
CPSES, Unit 2 has four Westinghouse Model D5 SGs. Each SG contains 4,570 thermally treated Alloy 600 tubes. Each tube has a nominal outside diameter of 3/4 inch and a nominal wall thickness of 0.043 inch. The tubes were hydraulically expanded at both ends for the full length of the tubesheet and are supported by a number of Type 405 stainless steel supports with quatrefoil shaped holes.
The licensee provided the scope, extent, methods, and results of its SG tube ISIs in the documents referenced above. In addition, the licensee described corrective actions taken in response to the inspection findings.
One finding of note was the single volumetric indication (SVI), found during 2RF06, in the U-bend apex in tube SG3-R6-C80. The depth estimate of the SVI was 46 percent. A special interest +Point' inspection confirmed a possible loose part (PLP). The licensee stated that, since the upper bundle was not opened due to lack of access, the PLP was neither located nor removed. Although the licensee did not indicate whether the tube was stabilized, an engineering evaluation (documented in WPT-16312, Foreign Object Wear Indications at Comanche Peak Unit 2 RF06 Outage, dated April 24, 2002) determined that the PLP could be left in place, and the tube was plugged.
Based on the assessment of the submittals provided, the staff concludes that the licensee provided the information required by its Technical Specifications. In addition, the staff concludes that there are no technical issues that warrant follow-up action at this time since the inspections appear to be consistent with the objective of detecting potential tube degradation and the inspection results appear to be consistent with industry operating experience at similarly designed and operated units.
Principal Contributor: J. Terrell Date: February 16, 2005
December 2004 Comanche Peak Steam Electric Station cc:
Senior Resident Inspector U.S. Nuclear Regulatory Commission P. O. Box 2159 Glen Rose, TX 76403-2159 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 Mr. Fred W. Madden, Director Regulatory Affairs TXU Generation Company LP P. O. Box 1002 Glen Rose, TX 76043 George L. Edgar, Esq.
Morgan Lewis 1111 Pennsylvania Avenue, NW Washington, DC 20004 County Judge P. O. Box 851 Glen Rose, TX 76043 Environmental and Natural Resources Policy Director Office of the Governor P. O. Box 12428 Austin, TX 78711-3189 Mr. Richard A. Ratliff, Chief Bureau of Radiation Control Texas Department of Health 1100 West 49th Street Austin, TX 78756-3189 Mr. Brian Almon Public Utility Commission William B. Travis Building P. O. Box 13326 1701 North Congress Avenue Austin, TX 78701-3326 Ms. Susan M. Jablonski Office of Permitting, Remediation and Registration Texas Commission on Environmental Quality MC-122 P. O. Box 13087 Austin, TX 78711-3087 Terry Parks, Chief Inspector Texas Department of Licensing and Regulation Boiler Program P. O. Box 12157 Austin, TX 78711