ML101340039
| ML101340039 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/20/2010 |
| From: | Hall J Plant Licensing Branch IV |
| To: | Edington R Arizona Public Service Co |
| Hall, J R, NRR/DORL/LPL4, 301-415-4032 | |
| References | |
| TAC ME2651 | |
| Download: ML101340039 (3) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 May 20, 2010 Mr. Randall K. Edington Executive Vice President Nuclear/
Chief Nuclear Officer Mail Station 7602 Arizona Public Service Company P.O. Box 52034 Phoenix, AZ 85072-2034
SUBJECT:
PALO VERDE NUCLEAR GENERATING STATION, UNIT 3 - REVIEW OF THE 2009 STEAM GENERATOR TUBE INSPECTIONS DURING REFUELING OUTAGE 14 (TAC NO. ME2651)
Dear Mr. Edington:
By letter dated November 18, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML093310442), Arizona Public Service Company (the licensee),
submitted the results of the 2009 steam generator (SG) tube inspections performed during refueling outage 14 at Palo Verde Nuclear Generating Station, Unit 3 (PVNGS 3). In addition, the licensee provided clarifying information in an e-mail to the U.S. Nuclear Regulatory Commission (NRC) staff dated February 12, 2010 (ADAMS Accession No. ML101380587).
The NRC staff has completed its review of the submittal and concludes that the licensee provided the information required by the PVNGS 3 technical specifications. No additional follow-up is required at this time. The staff's review is enclosed. If you have any questions, please contact me at (301) 415-4032 or via e-mail at randy.hall@nrc.gov.
Sincerely, 4vVV1~~ !Z.7/J{
d R. Hall, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-530
Enclosure:
As stated cc w/encl: Distribution via Listserv
STAFF EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO RESULTS OF 2009 STEAM GENERATOR TUBE INSPECTIONS PERFORMED DURING REFUELING OUTAGE 14 PALO VERDE NUCLEAR GENERATION STATION, UNIT 3 DOCKET NO. STI\\! 50-530 By letter dated November 18, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML093310442), Arizona Public Service Company (the licensee) submitted information summarizing the results of the 2009 steam generator (SG) tube inspections at the Palo Verde Nuclear Generating Station, Unit 3 (PVNGS 3). These inspections were performed during the PVNGS 3 refueling outage 14 (U3R14). In addition, the licensee provided clarifying information in an e-mail to the U.S. Nuclear Regulatory Commission (NRC) staff dated February 12, 2010 (ADAMS Accession No. ML101380587).
PVNGS 3 has two replacement SGs manufactured by Ansaldo. Each SG has 12,580 thermally treated Alloy 690 tubes with an outside diameter of 0.75 inches and a wall thickness of 0.042 inches. Ferritic stainless steel egg crate tube supports, diagonal bars, and vertical straps support the tubes at various locations. This was the first inservice inspection for the replacement SGs since they were installed during refueling outage 13 in the fall 2007.
The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (i.e., tube plugging) taken in response to the inspection findings.
In the e-mail dated February 12, 2010, the licensee stated that Foreign Object Search and Retrieval was the only secondary side inspection performed on its SGs during U3R14.
Additionally, the licensee clarified the purpose of the rotating probe inspections that were listed in the bottom four rows of Table 1 of the submittal dated November 18, 2009. These rotating probe inspections were performed as a follow-up to bobbin coil examinations, including bobbin I-codes, wear, manufacturer burnishing marks, dents, and possible loose parts examinations.
Rotating coil inspections were also performed in the U-bend region of rows 1 through 4 in both SGs.
Based on a review of the information provided, the NRC 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 that inspection results appear to be consistent with industry operating experience at similarly designed and operated units.
Enclosure
May 20,2010 Mr. Randall K. Edington Executive Vice President Nuclear/
Chief Nuclear Officer Mail Station 7602 Arizona Public Service Company P.O. Box 52034 Phoenix, AZ 85072-2034
SUBJECT:
PALO VERDE NUCLEAR GENERATING STATION, UNIT 3 - REVIEW OF THE 2009 STEAM GENERATOR TUBE INSPECTIONS DURING REFUELING OUTAGE 14 (TAC NO. ME2651)
Dear Mr. Edington:
By letter dated November 18, 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML093310442), Arizona Public Service Company (the licensee),
submitted the results of the 2009 steam generator (SG) tube inspections performed during refueling outage 14 at Palo Verde Nuclear Generating Station, Unit 3 (PVNGS 3). In addition, the licensee provided clarifying information in an e-mail to the U.S. Nuclear Regulatory Commission (NRC) staff dated February 12, 2010 (ADAMS Accession No. IVIL101380587).
The NRC staff has completed its review of the submittal and concludes that the licensee provided the information required by the PVNGS 3 technical specifications. No additional follow-up is required at this time. The staff's review is enclosed. If you have any questions, please contact me at (301) 415-4032 or via e-mail at randy.hall@nrc.gov.
Sincerely,
/raJ James R. Hall, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-530
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC LPLIV r/f RidsAcrsAcnw_MailCTR Resource RidsNrrDciCsgb Resource RidsNrrDorlLpl4 Resource RidsNrrPMPaloVerde Resource RidsNrrLAJBurkhardt Resource RidsOgcRp Resource RidsRgn4MailCenter Resource KKarwoski, NRR/DCI TMorgan, NRR/DCI/CSGB ADAMS Accession No ML101340039
- Concurrence by Memo OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/CSGB/BC NRR/LPL4/BC NRR/LPL4/PM NAME JRHall JBurkhardt RTaylor*
MMarkley JRHall DATE 5/18/2010 5/18110 4/7/10 5/20/10 5/20/10 OFFICIAL RECORD COpy