ML052980314

Review of Steam Generation Tube Inspection Summary Reports for the 2004 Refueling Outage

ML052980314
Person / Time
Site:	Callaway
Issue date:	11/04/2005
From:	Donohew J NRC/NRR/ADRO/DORL/LPLG
To:	Naslund C Union Electric Co
Donohew J N, NRR/DLPM,415-1307
References
TAC MC7253
Download: ML052980314 (8)

Text

November 4, 2005 Mr. Charles D. Naslund Senior Vice President and Chief Nuclear Officer Union Electric Company Post Office Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1 - REVIEW OF STEAM GENERATOR TUBE INSPECTION

SUMMARY

REPORTS FOR THE 2004 REFUELING OUTAGE (TAC NO. MC7253)

Dear Mr. Naslund:

By letters dated May 25, June 24, September 30, 2004, and June 2, 2005, AmerenUE, the licensee for the Callaway Plant, in accordance with the plants technical specifications, submitted the steam generator tube inspection summary reports for the 2004 refueling outage.

The Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee has provided the information required by its technical specifications.

The NRC staffs review of the reports is attached.

With the issuance of this summary, all work under TAC No. MC7253 is complete. If you have any questions or comments regarding the summary, please call me at (301) 415-1307.

Sincerely,

/RA Jack Donohew, Senior Project Manager Plant Licensing Branch G Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

Summary cc w/encl: See next page

November 4, 2005 Mr. Charles D. Naslund Senior Vice President and Chief Nuclear Officer Union Electric Company Post Office Box 620 Fulton, MO 65251

SUBJECT:

CALLAWAY PLANT, UNIT 1 - REVIEW OF STEAM GENERATOR TUBE INSPECTION

SUMMARY

REPORTS FOR THE 2004 REFUELING OUTAGE (TAC NO. MC7253)

Dear Mr. Naslund:

By letters dated May 25, June 24, September 30, 2004, and June 2, 2005, AmerenUE, the licensee for the Callaway Plant, in accordance with the plants technical specifications, submitted the steam generator tube inspection summary reports for the 2004 refueling outage.

The Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee has provided the information required by its technical specifications.

The NRC staffs review of the reports is attached.

With the issuance of this summary, all work under TAC No. MC7253 is complete. If you have any questions or comments regarding the summary, please call me at (301) 415-1307.

Sincerely,

/RA Jack Donohew, Senior Project Manager Plant Licensing Branch G Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-483

Enclosure:

Summary DISTRIBUTION:

PUBLIC cc w/encl: See next page LPLG Reading YDiaz DTerao MMurphy RidsNrrDlpmDpr LLund RidsNrrPMAWang RidsNrrPMJDonohew RidsNrrLALFeizollahi RidsOgcRp RidsAcrsAcnwMailCenter RidsRegion4MailCenter (BJones)

ACCESSION NO.: ML052980314 NRR-106 OFFICE NRR/LPLG/PM NRR/LPLG/LA NRR/LPLG/PM NRR/LPLG/BC NAME JDonohew:sp LFeizollahi AWang DTerao DATE 11/04/05 11/03/05 11/03/05 11/04/05 DOCUMENT NAME: E:\Filenet\ML052980314.wpd OFFICIAL RECORD COPY

REVIEW OF THE 2004 REFUELING OUTAGE STEAM GENERATOR TUBE INSPECTION REPORTS UNION ELECTRIC COMPANY CALLAWAY PLANT, UNIT 1 DOCKET NO. 50-483

1.0 INTRODUCTION

By letters dated May 25, June 24, September 30, 2004, and June 2, 2005 (Agencywide Documents Access and Management System Accession Numbers ML041560005, ML041830237, ML042820060, and ML051580381, respectively), AmerenUE, the licensee for the Callaway Plant, Unit 1 (Callaway), in accordance with the plants technical specifications, submitted the steam generator tube inspection summary reports for Refueling Outage 13 in 2004.

Callaway has four Westinghouse Model F recirculating steam generators that began operation in 1984. Each steam generator contains 5,626 Alloy 600 tubes with an outside diameter of 0.688 inch and a wall thickness of 0.040 inch. The first 10 rows of tubes in each steam generator were thermally treated and received a stress-relief heat treatment (1,214 tubes with the smallest radius of curvature in each steam generator). The remaining tubes were mill annealed. The tube support plates are stainless steel with quatrefoil-shaped holes, and the anti-vibration bars are chromium-plated Alloy 600.

2.0

SUMMARY

The licensee provided the scope, extent, methods, and results of their steam generator tube inspections in the documents stated above. In addition, the licensee described corrective actions (i.e., tube plugging or repair) taken in response to the inspection findings.

In the report dated June 24, 2004, the licensee provided a table with the tubes that were plugged in Steam Generator C. The licensee stated that the report contained a typographical error. During a conference call with the NRC staff, the licensee clarified that tubes R1C35, R20C24, and R28C33 were plugged on both the hot and cold-leg sides of the steam generator.

In report dated June 2, 2005, the licensee provided in Table 5 the minimum wall thickness for each of the electrosleeves. All but one measurement had decreased in thickness. During a conference call with the NRC staff, the licensee stated that the decrease in thickness is most likely a function of systematic error. In addition, the licensee stated that if the degradation exceeds 30 percent through-wall or a reduction in thickness of 0.009 inches based on nominal wall thickness of 0.031 inches, the tube will be plugged. None of the electrosleeve measurements met these criteria (refer to Tables 12.4.2 and 12.4.4 of BAW-10219P, Revision 4) for plugging.

The 2004 inspections are the last scheduled inspections of the model F steam generators at Callaway as the licensee plans to replace the four steam generators during the current refueling outage, which is scheduled to be completed in the fall of 2005.

Based on a review of the information provided, the Nuclear Regulatory Commission (NRC) staff concludes that the licensee provided the information required by its technical specifications. In addition, the NRC 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.

Callaway Plant, Unit 1 cc:

Professional Nuclear Consulting, Inc. Mr. Rick A. Muench 19041 Raines Drive President and Chief Executive Officer Derwood, MD 20855 Wolf Creek Nuclear Operating Corporation P.O. Box 411 John ONeill, Esq. Burlington, KA 66839 Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W. Mr. Dan I. Bolef, President Washington, D.C. 20037 Kay Drey, Representative Board of Directors Coalition for the Mr. Mark A. Reidmeyer, Regional Environment Regulatory Affairs Supervisor 6267 Delmar Boulevard Regulatory Affairs University City, MO 63130 AmerenUE P.O. Box 620 Mr. Lee Fritz, Presiding Commissioner Fulton, MO 65251 Callaway County Court House 10 East Fifth Street U.S. Nuclear Regulatory Commission Fulton, MO 65151 Resident Inspector Office 8201 NRC Road Mr. David E. Shafer Steedman, MO 65077-1302 Superintendent, Licensing Regulatory Affairs Mr. Les H. Kanuckel AmerenUE Manager, Quality Assurance P.O. Box 66149, MC 470 AmerenUE St. Louis, MO 63166-6149 P.O. Box 620 Fulton, MO 65251 Mr. Keith D. Young Manager, Regulatory Affairs Missouri Public Service Commission AmerenUE Governor Office Building P.O. Box 620 200 Madison Street Fulton, MO 65251 Jefferson City, MO 65102-0360 Mr. Scott Clardy, Director Regional Administrator, Region IV Section for Environmental Public Health U.S. Nuclear Regulatory Commission P.O. Box 570 611 Ryan Plaza Drive, Suite 400 Jefferson City, MO 65102-0570 Arlington, TX 76011-4005 Certrec Corporation Mr. Mike Wells, Deputy Director 4200 South Hulen, Suite 630 Missouri Department of Natural Resources Fort Worth, TX 76109 P.O. Box 176 Jefferson City, MO 65101 Director, Missouri State Emergency Management Agency P.O. Box 116 Jefferson City, MO 65102-0116 Updated: July 2005