ML062680304

San Onofre Nuclear Generating Station, Unit 2 - Request for Additional Information Regarding the 2006 Steam Generator Tube Inspections (TAC No. MC8395)

ML062680304
Person / Time
Site:	San Onofre
Issue date:	09/28/2006
From:	Kalyanam N K NRC/NRR/ADRO/DORL/LPLIV
To:	Rosenblum R M Southern California Edison Co
Kalyanam N, NRR/DORL, 415-1480
References
TAC MC8395
Download: ML062680304 (5)

Text

September 28, 2006Mr. Richard M. RosenblumSenior Vice President and Chief Nuclear Officer Southern California Edison Company San Onofre Nuclear Generating Station

P.O. Box 128 San Clemente, CA 92674-0128

SUBJECT:

SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 (SONGS 2) - REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE 2006 STEAM GENERATOR TUBE INSPECTIONS (TAC NO. MC8395)

Dear Mr. Rosenblum:

By letter dated February 7, 2006 (Agencywide Documents Access and Management System(ADAMS) Accession No. ML060400103), Southern California Edison Company (the licensee) submitted information summarizing the results of the 2006 steam generator tube inspections at SONGS 2. In addition to these reports, the U.S. Nuclear Regulatory Commission (NRC) staffsummarized additional information concerning the 2006 steam generator tube inspections at SONGS 2 in a letter dated April 3, 2006 (ADAMS Accession No. ML060950305).In order for the NRC staff to complete its review of the licensee's reports, it has beendetermined that additional information is required to complete the review. We request the response to this RAI within 30 days from the date of this letter. If you have any questions, please contact me at (301) 415-1480.Sincerely,/RA/N. Kalyanam, Project ManagerPlant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-361

Enclosure:

Request for Additional Information cc w/encl: See next page

ML060950305).In order for the NRC staff to complete its review of the licensee's reports, it has beendetermined that additional information is required to complete the review. We request the response to this RAI within 30 days from the date of this letter. If you have any questions, please contact me at (301) 415-1480.Sincerely,/RA/N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-361

Enclosure:

Request for Additional Information cc w/encl: See next pageDISTRIBUTIONPUBLICLPLIV r/fRidsNrrDorlLpl4RidsNrrPMNKalyanamRidsNrrLALFeizollahiRidsNrrDciCsgb RidsAcrsAcnwMailCenterRidsOgcRpKKarwoski, DCI RidsRgn4MailCenter (TPruett)RidsNrrDorlDpr ACCESSION NO: ML062680304* No major change from Staff provided RAIOFFICENRR/LPL4/PMNRR/LPL4/LANRR/DCI/CSGBNRR/LPL4/BCNAMENKalyanamLFeizollahiAHiser*DTerao DATE9/27/069/27/06 9/1/069/28/06 REQUEST FOR ADDITIONAL INFORMATIONSAN ONOFRE NUCLEAR GENERATING STATION, UNIT 22006 STEAM GENERATOR TUBE INSPECTIONS1.During a conference call in which the 2006 steam generator tube inspections werediscussed (refer to U.S. Nuclear Regulatory Commission (NRC) letter dated April 3,2006 - Agencywide Documents Access and Management System Accession No. ML060950305), there was some discussion concerning nickel migration associated with sleeved tubes. Please provide additional information concerning the nature of this phenomenon and the extent to which it could affect the detectability of flaws in thepressure boundary portion of the tube and the sleeve.2.Please confirm that no cracking was identified in dents and dings during your 2006inspections. If cracking was identified, please provide the size of the dent/ding, the location of the flaw, and its estimated size. The staff recognizes that certain dents/dings were not inspected with a rotating probe because of interferences associated with sleeves installed in the tube (and, as a result, a flaw could not positively be identified at the dents/dings in these tubes).3.Please discuss the results of your inspections associated with the scallop bars.

4.Regarding the eight tubes that were not inspected with a rotating probe due tointerference associated with the sleeves installed in the tubes, please provide the following information: the voltage for these indications, a summary of whether the dent has changed in size/characteristic since the prior inspection, and the date of the last rotating probe examination. These eight tubes were not in-situ pressure tested.5.Table 3 of the February 7, 2006, letter implies that 145 tubes were plugged for activedegradation in steam generator E-088 and 76 tubes were plugged for active degradation in steam generator E-089. Tables 8 and 9, however, only provide the sizes of approximately 40 indications in steam generator E-088 and 15 indications in steam generator E-089. Please provide the sizes (e.g., percent wall thickness) of all detected indications.6.Please discuss how the operating experience at Waterford Steam Electric Station,Unit 3 (refer to NRC Information Notice 2005-29, "Steam Generator Tube and SupportConfiguration") was factored into your 2006 steam generator tube inspections.7.In the NRC's summary of a conference call held to discuss the results of your 2006steam generator tube inspections, there was reference to a discussion concerning recent findings at Catawba Nuclear Station, Unit 2 (Catawba 2). The reference was made concerning inspections adjacent to tie rods and tubes surrounding all new and previously identified loose parts. Please confirm that Catawba 2 is the correct reference. If it is, please discuss the specific operating experience that is relevant to San Onofre, Unit 2. If Catawba 2 is not the correct reference, please provide the correct reference, if any.

March 2006San Onofre Nuclear Generating Station Units 2 and 3 cc:Mr. Daniel P. Breig Southern California Edison Company San Onofre Nuclear Generating Station

P. O. Box 128 San Clemente, CA 92674-0128Mr. Douglas K. Porter, EsquireSouthern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770Mr. David Spath, ChiefDivision of Drinking Water and Environmental Management P. O. Box 942732 Sacramento, CA 94234-7320Chairman, Board of SupervisorsCounty of San Diego 1600 Pacific Highway, Room 335 San Diego, CA 92101Mark L. ParsonsDeputy City Attorney City of Riverside 3900 Main Street Riverside, CA 92522Mr. Gary L. Nolff Assistant Director - Resources City of Riverside 3900 Main Street Riverside, CA 92522Regional Administrator, Region IVU.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064Mr. Michael R. OlsonSan Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548Director, Radiologic Health BranchState Department of Health Services P.O. Box 997414, MS 7610 Sacramento, CA 95899-7414Resident Inspector/San Onofre NPS c/o U.S. Nuclear Regulatory Commission Post Office Box 4329 San Clemente, CA 92674Mayor City of San Clemente 100 Avenida Presidio San Clemente, CA 92672Mr. James T. Reilly Southern California Edison Company San Onofre Nuclear Generating Station

P.O. Box 128 San Clemente, CA 92674-0128Mr. James D. Boyd, CommissionerCalifornia Energy Commission 1516 Ninth Street (MS 31)

Sacramento, CA 95814Mr. Ray Waldo, Vice PresidentSouthern California Edison Company San Onofre Nuclear Generating Station

P.O. Box 128 San Clemente, CA 92764-0128Mr. Brian KatzSouthern California Edison Company San Onofre Nuclear Generating Station

P.O. Box 128 San Clemente, CA 92764-0128 March 2006San Onofre Nuclear Generating Station Units 2 and 3 cc:Mr. Steve Hsu Department of Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899Mr. A. Edward SchererSouthern California Edison Company San Onofre Nuclear Generating Station

P.O. Box 128 San Clemente, CA 92674-0128