ML13057A682
| ML13057A682 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 03/05/2013 |
| From: | Bhalchandra Vaidya Plant Licensing Branch 1 |
| To: | George Gellrich Calvert Cliffs |
| Vaidya B, NRR/DORL/LPL1-1, 415-3308 | |
| References | |
| TAC ME9439 | |
| Download: ML13057A682 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 March 5, 2013 Mr. George H. Gellrich, Vice President Calvert Cliffs Nuclear Plant, LLC Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO.1 - REVIEW OF THE OCTOBER 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS DURING SPRING 2012 OUTAGE (TAC NO. ME9439)
Dear Mr. Gellrich:
By letters dated August 7, 2012, and January 25, 2013, (Agencywide Documents Access and Management Systems Accession Number ML12221A225 and ML13030A134), Constellation Energy Nuclear Group, the licensee, submitted information summarizing the results of the 2012 steam generator tube inspections performed at Calvert Cliffs Nuclear Power Plant, Unit 1.
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by the Calvert Cliffs Nuclear Power Plant, Unit 1, Technical Specifications and that no additional follow-up is required. The NRC staff's review is enclosed.
If you have any questions, please call me at 301-415-3308.
Sincerely, Bhalchandra K. Vaidya, Project Manager Plant licenSing Branch 1-1 Division of Operating Reactor licensing Office of Nuclear Reactor Regulation Docket No. 50-317
Enclosure:
As stated cc w/encl: Distribution via listserv
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 CALVERT CLIFFS NUCLER POWER PLANT, UNIT 1 STAFF REVIEW OF THE STEAM GENERATOR TUBE INSERVICE INSPECTIONS FOR THE SPRING 2012 REFUELING OUTAGE (TAC NO. ME9439)
DOCKET No. 50-317 By letters dated August 7,2012, and January 25,2013 (Agencywide Documents Access and Management Systems Accession Number (ADAMS) ML12221A225 and ML13030A134),
Constellation Energy Nuclear Group, the licensee, submitted information summarizing the results of the 2012 steam generator (SG) tube inspections performed at Calvert Cliffs Nuclear Power Plant, Unit 1.
Calvert Cliffs Unit 1 has two Babcock and Wilcox International (BWI) steam generators containing 8471 tubes each. The tubing material is thermally treated Alloy 690. The tubes have an outside diameter of 0.75 inches and a nominal wall thickness of 0.042 inches. The SGs have a triangular tube pitch arrangement with 1-inch spacing between tube centers. The tubes are hydraulically expanded over the entire depth of the tubesheet in both the hot-leg and cold-leg.
The tubesheet is 21.875 inches thick without the clad. The austenitic stainless steel tubesheet cladding has a minimum thickness of 0.375 inches. The lattice grid tube support structures and the U-bend supports are made of 410 stainless steel. The smallest radii for the U-bend are 3.5 inches in row 1. Rows 1 through 18 of the U-bend received stress relief treatment after bending.
The licensee provided the scope, extent, methods, and results of the SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (Le., tube plugging) taken in response to the inspection findings.
Based on a review of the information provided, the staff concludes that the licensee provided the information required by the 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: C. Hunt, NRR/DE/ESGB Date: March 5, 2013 Enclosure
March 5, 2013 Mr. George H. Gellrich, Vice President Calvert Cliffs Nuclear Plant, Inc.
Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657-4702
SUBJECT:
CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NO.1 - REVIEW OF THE OCTOBER 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS DURING SPRING 2012 OUTAGE (TAC NO. ME9439)
Dear Mr. Gellrich:
By letters dated August 7,2012, and January 25,2013, (Agencywide Documents Access and Management Systems Accession Number ML12221A225 and ML13030A134), Constellation Energy Nuclear Group, the licensee, submitted information summarizing the results of the 2012 steam generator tube inspections performed at Calvert Cliffs Nuclear Power Plant, Unit 1.
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by the Calvert Cliffs Nuclear Power Plant, Unit 1, Technical Specifications and that no additional follow-up is required. The NRC staff's review is enclosed.
If you have any questions, please call me at 301-415-3308.
Sincerely, Ira!
Bhalchandra K. Vaidya, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-317
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPL1-1 R/F DSchroeder, Region 1 RidsNrrDorlLPL1-1 RidsNrrPMCalvertCliffs RidsNrrLAKGoldstein RidsRgn1 MailCenter RidsOgcRp RidsAcrsAcnw MailClr RidsNrrDeEsgb CHunt, NRR/DE/ESGB KKarwoski, NR-R/DE ADAMS Accession No. ML13057A682
(*) No substantial change to Evaluation Memo, ML13036A210
~FICE NRRlLPL1-1/PM NRR/LPL1-1/LA NRR/ESGB/BC{*)
NRR/LPL 1-lIBC INRR/LPL1-1/PM AME BVaidya KGoldstein GKulesea SMeighan BVaidya DATE 3/4/13 03101113 02/22/13 315113 3/5113 OFFICIAL RECORD COpy