ML13051B143
| ML13051B143 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 02/25/2013 |
| From: | Joel Wiebe Plant Licensing Branch III |
| To: | Pacilio M Exelon Generation Co, Exelon Nuclear |
| Joel Wiebe, NRR/DORL 415-6606 | |
| References | |
| TAC ME9505 | |
| Download: ML13051B143 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 25, 2013 Mr. Michael J. Pacilio Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO)
Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
BRAIDWOOD NUCLEAR POWER STATION, UNIT 1 - REVIEW OF THE SPRING 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS (TAC NO. ME9505)
Dear Mr. Pacilio:
By letter to the U.S. Nuclear Regulatory Commission (NRC) dated August 17, 2012 (Agencywide Documents Access Management Systems (ADAMS) Accession No. ML12249A057), Exelon Generation Company, LLC (the licensee), submitted information summarizing the results of their 2012 steam generator tube inspections performed during refueling outage 16 at Braidwood Nuclear Power Station, Unit 1 (Braidwood 1).
The NRC staff has completed its review of the report and concludes that the licensee provided the information required by the Braidwood 1 technical specifications. No additional follow-up is required at this time. The NRC staffs review is enclosed.
If you have any questions regarding the enclosure, please contact me at (301) 415-6606.
Sincerely, i::w~~~ect Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-456
Enclosure:
Summary of NRC Staff Review cc w/encl: Listserv
SUMMARY
OF NRC STAFF REVIEW OF THE STEAM GENERATOR TUBE INSERVICE INSPECTION FOR REFUELING OUTAGE 16 BRAIDWOOD NUCLEAR POWER STATION. UNIT NO.1 DOCKET NO. STN 50-456 By letter to the U.S. Nuclear Regulatory Commission (NRC) dated August 17, 2012, (Agencywide Documents Access and Management Systems (ADAMS) Accession No. ML12249A057), Exelon Generation Company, LLC, the licensee, submitted information summarizing the results of the 2012 steam generator (SG) tube inspections performed at Braidwood, Unit 1.
Braidwood Station, Unit 1, has four recirculating SGs designed and fabricated by Babcock and Wilcox International. Each SG has 6,633 thermally-treated, Alloy 690 tubes, that have an outside diameter of 0.6875 inches, and a nominal wall thickness of 0.040 inches. The tubes are supported by Type 410 stainless steel, lattice-grid tube supports, and flat fan bars. The tubes were hydraulically-expanded at each end for the full depth of the tubesheet.
The licensee provided the scope, extent, methods, and results of their SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (e.g.,
tube plugging) taken in response to the inspection findings.
In addition, the licensee clarified in an email that secondary side visual inspections were performed during the Spring 2012 outage. These inspections included:
- Top of tubesheet visual inspection and Foreign Object Search and Retrieval following sludge lancing in each SG, Feed water feedring visual inspection in SG C, Steam drum visual inspection in SG C, Upper tube bundle inspection in SG C.
No anomalies or degradation were found in any of these visual inspections. A few minor foreign objects were found and either retrieved or evaluated.
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 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.
Primary Contributor: C. Hunt Enclosure
Mr. Michael J. Pacilio Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer (CNO)
Exelon Nuclear 4300 Winfield Road Warrenville, IL 60555
SUBJECT:
BRAIDWOOD NUCLEAR POWER STATION, UNIT 1 - REVIEW OF THE SPRING 2012 STEAM GENERATOR TUBE INSERVICE INSPECTIONS (TAC NO. ME9505)
Dear Mr. Pacilio:
By letter to the U.S. Nuclear Regulatory Commission (NRC) dated August 17, 2012 (Agencywide Documents Access Management Systems (ADAMS) Accession No. ML12249A057), Exelon Generation Company, LLC (the licensee), submitted information summarizing the results of their 2012 steam generator tube inspections performed during refueling outage 16 at Braidwood Nuclear Power Station, Unit 1 (Braidwood 1).
The NRC staff has completed its review of the report and concludes that the licensee provided the information required by the Braidwood 1 technical specifications. No additional follow-up is required at this time. The NRC staff's review is enclosed.
If you have any questions regarding the enclosure, please contact me at (301) 415-6606.
Sincerely, I RA I Joel S. Wiebe, Senior Project Manager Plant Licensing Branch 111-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-456
Enclosure:
Summary of NRC Staff Review cc w/encl: Listserv DISTRIBUTION:
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