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MONTHYEARML0826104582008-09-24024 September 2008 Upcoming Steam Generator Tube Inservice Inspection Project stage: Other ML0832408112008-12-0303 December 2008 Summary of Conference Call with Southern California Edison Representatives, Discussions on San Onofre Unit 3 Steam Generator Tube Inspections Project stage: Other 2008-12-03
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Category:Letter
MONTHYEARML24022A1492024-01-17017 January 2024 Independent Spent Fuel Storage Installation, Revision 4 to the Physical Security Plan IR 05000361/20230062023-11-29029 November 2023 NRC Inspection Report 05000361/2023-006 and 05000362/2023-006 ML23333A0682023-11-22022 November 2023 (SONGS) Units 1, 2, 3 and Independent Spent Fuel Storage Installation - Notification of Change in Nuclear Officer IR 05000361/20230052023-10-11011 October 2023 NRC Inspection Report 05000361/2023005 and 05000362/2023005 ML23276A5942023-09-28028 September 2023 and Independent Spent Fuel Storage Installation - Supplement to Decommissioning Funding Status Reports ML23268A0922023-09-20020 September 2023 Generation Station, Units 1, 2 and 3, and the Independent Spent Fuel Storage Facility (ISFSI) - Re-Registration of Dry Fuel Storage Casks for Amended Certificate of Compliance No. 1040 IR 05000361/20230012023-09-13013 September 2023 NRC Inspection Report 05000361 2023-001 and 05000362 2023-004 ML23240A5372023-08-18018 August 2023 Confirmatory Survey Activities Summary and Results for the Unit 2 and 3 Intake Structures at the San Onofre Nuclear Generating Station San Clemente CA ML23129A1802023-06-14014 June 2023 Cover Letter to State of CA on Draft EA Regarding San Onofre ISFSI Updated DFPs IR 05000361/20230032023-05-31031 May 2023 NRC Inspection Report 05000361/2023003 and 05000362/2023003 IR 05000361/20230022023-05-23023 May 2023 NRC Inspection Report 05000361/2023-002 and 05000362/2023-002 ML23137A1032023-05-11011 May 2023 (Songs), Units 1, 2 and 3, and Independent Spent Fuel Storage Installation - 2022 Annual Radiological Environmental Operating Report ML23123A0932023-04-28028 April 2023 (Songs), Units 1, 2 and 3, Submittal of Annual Radioactive Effluent Release Report - 2022 ML23230A0882023-04-10010 April 2023 Independent Spent Fuel Storage Installation - Decommissioning Quality Assurance Plan ML23094A1272023-03-29029 March 2023 Independent Spent Fuel Storage Installation - 10 CFR 50.82(a)(8)(v and VII) and 10 CFR 72.30(c) Decommissioning Funding Status Report 2021 ML23094A1332023-03-29029 March 2023 Nuclear Property Insurance ML23062A1172023-02-28028 February 2023 Generation Station Units 1, 2 and 3, Annual Radioactive Effluent Release Report for Independent Spent Fuel Storage Installation - 2022 ML22361A1022023-02-24024 February 2023 Reactor Decommissioning Branch Project Management Changes for Some Decommissioning Facilities and Establishment of Backup Project Manager for All Decommissioning Facilities ML23059A2812023-02-22022 February 2023 (Songs), Units 1, 2 and 3, 2022 Annual Turtle Incidental Take Report ML23046A3792023-02-22022 February 2023 NRC Inspection Report 050-00361/2023-001 and 050-00362/2023-001 ML23045A2022023-02-0909 February 2023 Submittal of Annual Corporate Financial Reports for San Onofre Nuclear Generating Station (SONGS) Units 2 and 3 for Fy Ending June 30, 2022 ML22287A1352023-01-0505 January 2023 Issuance of Exemption from Title 10 of the Code of Federal Regulations Part 72.106(B), Independent Spent Fuel Storage Installation Controlled Area Boundary (L-2021-LLE-0056) ML22348A0622023-01-0404 January 2023 NRC to SCE, Transmittal of the National Marine Fisheries Service'S December 12, 2022, Letter of Concurrence for Decommissioning of San Onofre Nuclear Generating Statiion, Units 2 and 3 IR 05000206/20220062022-12-15015 December 2022 NRC Inspection Report 05000206/2022006, 05000361/2022-006, and 05000362/2022-006 ML22347A2122022-12-12012 December 2022 NMFS to NRC, Endangered Species Act Section 7(a)(2) Concurrence Letter for Decommissioning of the San Onofre Nuclear Generating Station ML22340A6652022-12-0505 December 2022 Letter from John Fassell, Chief; Re., State of California Department of Public Health Review and Comments on SONGS Draft Environmental Assessment ML22333A8192022-11-21021 November 2022 Submittal of San Onofre Nuclear Generating Station, Units 2 and 3, Defueled Safety Analysis Report, Revised November 2022 IR 05000361/20220052022-11-17017 November 2022 NRC Inspection Report 05000361/2022-005 and 05000362/2022-005 ML22301A1462022-10-20020 October 2022 Report of Violations of the National Pollutant Discharge Elimination System Permit San Onofre Nuclear Generating Station (Songs), Units 2 and 3 ML22277A0162022-09-29029 September 2022 Independent Spent Fuel Storage Installation Response to Request for Additional Information Regarding Request for Exemption from 10 CFR 72.106(b) IR 05000361/20220042022-09-26026 September 2022 NRC Inspection Report 05000361/2022-004 and 05000362/2022-004 ML22238A0552022-08-29029 August 2022 U.S. Nuclear Regulatory Commission'S Analysis of Southern California Edison'S Decommissioning Funding Status Report for San Onofre Nuclear Generating Station, Units 1, 2, and 3 ML22234A1602022-07-31031 July 2022 Final Report Per 10 CFR Part 21, Degraded Snubber SF1154 Hydraulic Fluid Batch No. 18CLVS431 ML22207B8612022-07-26026 July 2022 NRC (Public) Inspection Report 05000361/2022003; 05000362/2022003 IR 05000361/20220032022-07-26026 July 2022 NRC Inspection Report (Public) 05000361-2022003 and 05000362-2022003 (002) IR 05000361/20220022022-05-12012 May 2022 NRC Inspection Report 05000361/2022-002 and 05000362/2022-002 ML22136A0842022-05-12012 May 2022 Independent Spent Fuel Storage Installation, 2021 Annual Radiological Environmental Operating Report ML22122A0402022-04-28028 April 2022 (Songs), Units 1, 2 and 3 - Annual Radioactive Effluent Release Report - 2021 ML22105A5662022-04-0505 April 2022 20053 Letter - OI Closure to Licensee - Wrongdoing Signed ML22081A1692022-03-31031 March 2022 SONGS Application Acceptance Proposed Exemption from Title 10 of the CFR, Part 72.106(b), ISFSI Controlled Boundary IR 05000206/20214022022-03-24024 March 2022 Notice of Violation, NRC Inspection Report 05000206/2021402, 05000361/2021402, 05000362/2021402, and 07200041/2021401; and Investigation Report 4-2021-004- Public- Cover Letter ML22084A0552022-03-23023 March 2022 10 CFR 50.82(a)(8Xv and VII) and 10 CFR 72.30(c) Decommissioning Funding Status Report 2021 San Onofre Nuclear Generating Station Units 1, 2, and 3 and Independent Spent Fuel Storage Installation IR 05000361/20220012022-03-14014 March 2022 NRC Inspection Report 05000361/2022-001; 05000362/2022-001 ML22066B0242022-03-0303 March 2022 (Songs), Units 1, 2, and 3, and the Independent Spent Fuel Storage Installation - Revision 2 to the ISFSI-Only Emergency Plan and Associated Changes to Emergency Plan Implementing Procedures ML22062B0282022-02-28028 February 2022 and Independent Spent Fuel Storage Installation (Isfsi), Response to Request for Supplemental Information Regarding Request for Exemption from 10 CFR 72.106(b) ML22059B0392022-02-25025 February 2022 International, Proprietary Information to Support SCE Exemption ML22060A1132022-02-24024 February 2022 Nuclear Property Insurance ML22060A1152022-02-24024 February 2022 Generation Station Units 1, 2 and 3, Annual Radioactive Effluent Release Report for Independent Spent Fuel Storage Installation - 2021 ML22048B4972022-02-15015 February 2022 (Songs), Units 1, 2 and 3 - 2021 Annual Turtle Incidental Take Report ML22031A1112022-01-26026 January 2022 (Songs), Units 2 and 3 - Annual Corporate Financial Reports 2024-01-17
[Table view] Category:Meeting Summary
MONTHYEARML23206A2062023-07-28028 July 2023 Summary of July 17-18 2023 Routine Site Visit at SONGS 1 2 and 3 ML22206A1172022-08-18018 August 2022 Summary of July 21, 2022 Meeting with the National Marine Fisheries Service on Endangered Species Act Consultation for the San Onofre Nuclear Generating Station, Units 2 and 3, Decommissioning ML22062B6452022-03-10010 March 2022 02/02-03/2022 Summary of Routine Site Visit at San Onofre Nuclear Generating Station, Units 1, 2 and 3 ML22061A2152022-03-0808 March 2022 Summary of Teleconference with the National Marine Fisheries Services on Endangered Species Act Consultation for SONGS, Units 2 and 3 Decommissioning ML21075A2832021-03-17017 March 2021 Summary of Pre-Submittal Teleconference with Soutern California Edison on Request for Proposed Exemption to 10 CFR 72.106(B) (L-2021-LRM-0027) ML19263A6602019-09-24024 September 2019 SONGS NEIMA 108 Public Meeting Summary ML19164A3322019-06-24024 June 2019 Meeting Summary - NRC Decision on Southern California Edison Fuel Transfer Operations = June 3, 2019 ML19092A3942019-04-0505 April 2019 March 25, 2019 NRC Public Meeting/Webinar Summary ML18318A2952018-11-14014 November 2018 Special Inspection Webinar; Meeting Summary ML18319A1392018-11-14014 November 2018 Public Meeting Summary, Special Inspection Webinar ML14321A7192015-04-0808 April 2015 Summary of Meeting with Southern California Edison to Discuss Proposed Changes to the Emergency Preparedness Plan at San Onofre, Units 2 and 3 ML14314A0192015-04-0808 April 2015 Summary of Meeting with Southern California Edison Regarding Planned Quality Assurance Plan Changes for San Onofre, Units 2 and 3 ML14351A3962015-03-0909 March 2015 Summary of Meeting in Carlsbad, California to Discuss and Accept Comments Regarding the San Onofre Nuclear Generating Station Post-Shutdown Decommissioning Activities Report ML14321A7082015-02-24024 February 2015 9/24/2014 Summary of Meeting with Southern California Edison to Discuss Plans to Relocate Current Main Control Room to a Command Center During Decommissioning of San Onofre, Units 2 and 3 ML14216A4512015-02-0909 February 2015 7/31/14 Summary of Closed Meeting with Southern California Edison to Discuss Scope and Schedule Related to Cyber Security License Amendment Request for San Onofre Nuclear Generating Station, Units 2 and 3 ML13322A4222013-11-22022 November 2013 9/26/2013 - Summary of Category 3 Public Meeting in Carlsbad, CA, to Discuss the Regulatory Framework and the Decommissioning of Previously Operating Nuclear Power Plants ML13066A6322013-03-0606 March 2013 2/12/2013 - Summary of Category 3 Public Meeting Concerning the Current Status of San Onofre Nuclear Generating Station ML13017A1122013-02-13013 February 2013 G20120891 - Summary of 1/16/2013 Meeting with Petitioner 2.206 Petition, Richard Ayres, Friends of the Earth 11/16/12 Letter and 10 CFR 50.59 Review for the Replacement Steam Generators at San Onofre ML12346A1162012-12-10010 December 2012 Meeting Summary for November 30, 2012, Meeting with Southern California Edison Company ML12339A0842012-11-30030 November 2012 SONGS Meeting Summary 11-30-12 ML12237A0202012-09-0404 September 2012 Summary of Telephone Conference Issues Associated with License Amendment Request Related to Transition to Areva Fuel ML12179A4472012-06-26026 June 2012 6/18/2012 Meeting Summary for Augmented Inspection Team Exit Meeting with Southern California Edison Co ML12157A2722012-06-11011 June 2012 5/31/2012 Summary of Telephone Conference with Licensees Regarding Near Term Task Force Recommendation 2.1 Seismic Reevaluations - Diablo Canyon, 1 and 2, San Onofre, Units 2 and 3, Columbia Generating Station, and Palo Verde, Units 1, 2, a ML1210903952012-06-0707 June 2012 04/7/2011 Summary of Meeting with Southern California Edison to Discuss Future San Onofre, Units 2 and 3, License Amendment Submittal Related to Adoption of Risk-Informed NFPA-805 ML1115304302011-06-0101 June 2011 Meeting Summary for Public Meeting with Southern California Edison to Present & Discuss the Performance Results for San Onofre Nuclear Generating Station Units 2 & 3 for Period of January 1 Through December 31, 2010 ML1027304522010-09-30030 September 2010 Meeting Summary for 09/16/2010 Public Meeting with Southern California Edison ML1009505142010-04-0505 April 2010 Meeting Summary for Public Meeting with Southern California Edison Company on San Onofre Nuclear Generating Station 2009 Performance ML0932402122009-11-20020 November 2009 Summary of Public Meeting with Southern California Edison Company on San Onofre Nuclear Generating Station 2009 Performance ML0926502992009-09-22022 September 2009 Summary of Public Meeting with Southern California Edison Regarding Site Improvement Initiatives ML0919506292009-06-22022 June 2009 Summary of Meeting with Southern California Edison Company to Discuss the San Onofre Nuclear Generation Station Site Improvement Initiatives ML0914905092009-05-28028 May 2009 Summary of Meeting with Southern California Edison Company Several Initiatives That Were Being Implemented to Improve Licensed Operator Training at San Onofre Nuclear Generating Station ML0902803782009-02-0505 February 2009 Summary of Closed Meeting with Representatives of Southern California Edison Company to Discuss Security Plan Changes During Steam Generator Replacement Outages at San Onofre Nuclear Generating Station, Units 2 and 3 ML0833607102008-12-0303 December 2008 Summary of Closed Meeting with Southern California Edison Company, Regarding San Onofre Nuclear Station, Units 2 and 3 ML0832408112008-12-0303 December 2008 Summary of Conference Call with Southern California Edison Representatives, Discussions on San Onofre Unit 3 Steam Generator Tube Inspections ML0832502332008-12-0202 December 2008 Summary of Public Meeting with Operators of Vogtle Units 1 & 2, San Onofre Units 2 & 3, St. Lucie Unit 1, Turkey Point Unit 3, Indian Point Units 2 & 3, Nuclear Energy Institute, and Alion Science and Technology ML0822602532008-08-12012 August 2008 Summary of Meeting on with Southern California Edison Co Regarding the End-of-Cycle Assessment of San Onofre Nuclear Generating Station ML0819303712008-07-11011 July 2008 Summary of Meeting with Southern California Edison to Discuss Release for Unrestricted Use of the Off-shore Portion of the Circulating Water System from San Onofre Nuclear Generating Station Unit 1 ML0727100022007-10-0404 October 2007 Summary of Meeting with Representatives of Southern California Edison, Licensee for San Onofre Nuclear Generating Station, Unit 3 - Evaluation of Indications in Control Element Drive Mechanism Penetration 56 as No Detectable Defect ML0720703362007-07-20020 July 2007 Summary of San Onofre Nuclear Generating Station End-Of-Cycle Public Meeting ML0719801012007-07-18018 July 2007 Summary of Meeting with Representatives of Southern California Edison Re San Onofre Nuclear Generating Station, Units 2 and 3 Re Amendment Request PCN-548, Rev. 2 - Battery and DC Sources Upgrades and Cross-Tie ML0634503052006-12-18018 December 2006 Summary of 11/17/2006 Discussions Steam Generator Tube Inspections - Refueling Outage 14 (TAC No. MD3204) - Letter to Licensee and Summary of Conference Call ML0627802182006-10-11011 October 2006 David Pilmer Ltr 8/22/06 Meeting with SCE Transmittal of Meeting Report About San Onofre Unit 1 Cooling Water Intake and Discharge System Sampling ML0616700832006-06-26026 June 2006 6/14/06 Public Meeting Summary on the Reactor Oversight Process ML0616701402006-06-16016 June 2006 (SONGS 2 and 3) - Summary of Meeting Dated 06/07/06 with Representatives of SCE ML0616700952006-06-0808 June 2006 Meeting Summary for End-of-Cycle Performance Assessment ML0616701242006-06-0808 June 2006 Meeting Summary - Discussion of Safety Conscious Work Environment and Nuclear Safety Culture at San Onofre ML0622700772006-05-23023 May 2006 Weld Overlay of Cast Material ML0613504112006-05-12012 May 2006 Summary of 05/03/2006 Meeting with Representatives of Southern California Edison to Discuss San Onofre Nuclear Generating Station Safety Conscious Work Environment and Nuclear Safety Culture ML0609502862006-04-0303 April 2006 SONGS 2, Summary of Jan 2006 Discussions of Steam Generator Tube Inspections ML0606901542006-03-0909 March 2006 SONGS 2 and 3 Summary of Meeting Dated 03/02/06 2023-07-28
[Table view] |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 December 3, 2008 Mr. Ross T. Ridenoure Senior 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 3 -
SUMMARY
OF OCTOBER 31,2008, DISCUSSIONS ON STEAM GENERATOR TUBE INSPECTIONS (TAC NO. MD9640)
Dear Mr. Ridenoure:
On October 31, 2008, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with Southern California Edison (SCE) representatives, R. Coe, A. Matheny, and A. Brough, regarding the 2008 steam generator tube inspections at San Onofre Nuclear Generating Station, Unit 3. A summary of the October 31,2008, conference call is provided in the enclosure; the information supplied by SCE, in support of these discussions (handouts), is provided in an attachment to the enclosure. The NRC staff did not identify any issues that would warrant preventing the plant from starting up following its 15th refueling outage.
If you have any questions, please call me at (301) 415-1480.
Sincerely, 1~
N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-362
Enclosure:
- 1) Summary of conference call
- 2) Handouts cc w/encl: Distribution via ListServ
SUMMARY
OF OCTOBER 31, 2008, CONFERENCE CALL WITH SOUTHERN CALIFORNIA EDISON REGARDING THE FALL 2008 STEAM GENERATOR TUBE INSPECTION AT SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 3 DOCKET NO. 50-362 On October 31,2008, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with Southern California Edison (SCE, the licensee) representatives, R. Coe, A Matheny, and A. Brough, to discuss the ongoing steam generator (SG) tube inspections during their Cycle 15 refueling outage (3C15) at San Onofre Nuclear Generating Station, Unit 3 (SONGS 3).
SONGS 3 has two Combustion Engineering Model 3410 SGs, designated SG 88 and SG 89, each with 9,350 tUbes made from mill annealed Alloy 600. The tubes have an outside diameter of 0.75 inches and a nominal wall thickness of 0.048 inches. The tubes are explosively expanded for the full depth of the tubesheet and are supported by carbon steel lattice grids (eggcrates). The tubes are also supported by carbon steel vertical and diagonal bars in the U-bend section. This was the last scheduled inspection of the Unit 3 SGs, which are scheduled to be replaced in the fall of 2010, after the upcoming Cycle 16 operating cycle.
Prior to the conference call, the licensee provided a written response to a set of discussion points from the NRC staff (Agencywide Documents Access and Management System (ADAMS)
Accession No. ML082610458). The licensee's response, dated October 30,2008, (ADAMS Accession No. ML083240834) is included as an enclosure. The abbreviations used by the licensee in the enclosure are:
ALARA As Low As Reasonably Achievable CA Crack Angle CIRC Circumferential COL Column ECT Eddy Current Testing EFPY Effective Full Power Years Elev Elevation EPRI Electric Power Research Institute FLDA Flaw Length Degraded Area ID Inside Diameter Ind Indication PDA Percent Degraded Area PP Plus Point SAl Single Axial Indication SCA Single Circumferential Indication TSC tubesheet cold TSH tubesheet hot TW Through Wall Additional clarifying information and information not included in the attached document is summarized below.
Enclosure 1
-2 In discussing the scope of the inspections, the licensee clarified that a 100 percent inspection of the cold leg top of the tubesheet (TTS) locations was performed during 3C14 (November 2006). The rotating probe inspections conducted at the cold-leg TTS during this refueling outage included all the periphery tubes. The licensee also explained that dents are defined as tube diameter distortions located at a support plate, while dings are defined as tube diameter distortions located in a freespan.
The noise levels in the eddy current data in the 2008 outage are comparable to what has been observed in other Combustion Engineering model SGs that have tubing manufactured by Sawhill Tubular. Other plants that had (or still have) similar SGs are Arkansas Nuclear One, Unit 2, Saint Lucie Plant, Unit 2, and Waterford Steam Electric Station, Unit 3.
A visual exam was performed on the secondary side of the SGs using remote video camera equipment. The inspection stated the entire periphery and the blow down lane.
The licensee indicated that the one loose part found in SG 89 near the stay cylinder, on the cold-leg at the TTS was not detected during the +Point' exam, but was found visually during the foreign object search and retrieval (FOSAR). The neighboring tubes of this loose part were examined with the +Point' probe. Since this loose part could not be removed from the SG, four tubes surrounding this loose part will be plugged. These tubes will not be stabilized since the part is firmly lodged in place, and the SGs will only be operated for one more cycle.
The licensee stated that potential loose parts (PLPs) found in the periphery are visually examined during FOSAR. Other PLPs that cannot be dispositioned by a visual exam are dispositioned by a historical eddy current review and by looking for trends and patterns in eddy current PLP signals. The licensee indicated that in SGs where the tubes are arranged in a triangular pattern, a true loose part would typically affect three tubes.
The licensee stated that there were no upper steam drum or upper bundle in bundle inspections performed this outage.
The licensee stated that flow accelerated corrosion was found in Unit 3 prior to a chemical cleaning performed in the 1990's during 3C9. The extent of corrosion was more severe in Unit 3 than Unit 2. The corrosion was a result of a change in flow patterns on the secondary side of the SG caused by the accumulation of deposits.
Visual inspections in several outages following chemical cleaning indicated no further degradation or changes in the position of the supports.
At the end of the call, the licensee was requested to inform the NRC staff if during the remainder of the inspections there were any unexpected results such as new degradation mechanisms.
SONGS Unit 3 Steam Generator Inspections 3C15 Update with the NRC October 30,2008 ENCLOSURE 2
SONGS Unit 3 Background Two (2) Steam Generators
- Supplied by Combustion Engineering
- Designated SG 88 and 89
- SG88 - 8617 tubes in Service (7.9% Plugged)
- SG89 - 8688 tubes in Service (7.1 % Plugged)
- No sleeves are installed in SONGS Unit 3 Recent Exam Outages
-' Current Refueling Outage (3C15) -19.6 EFPY Last scheduled inspection prior to replacement October 30, 2008 2
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8
Completion Status as of 10/30/2008
- Bobbin ECT Inspection .- Complete
- +Point ECT Inspection - Complete
- Foreign Object Search (FOSAR)
- Complete Both SGs
- In-Situ Testing - No candidate tubes identified
- Final Review of Inspection Data and Repair List Preparation In Progress
- Plugging - To begin 10/31/2008 Note: Since exams are still in progress, all data and numbers in this presentation should be considered preliminary and subject to change.
October 30, 2008 4
Discussion Points (DP)
DP-1) Discuss any trends in the amount of primary-to-secondary leakage observed during the recently completed cycle.
- SONGS Unit 3 has some reported extremely low-level primary-to secondary leakage. Discoverv was June 2,2006, and it has remained stable at approximately 2x1 O-~ gallons per day. Similar leakage was noted for SONGS Unit 2 starting on July 25, 2007. This leakage is well below the threshold of detection of normal monitoring instrumentation (the condenser air ejector radiation monitor at approximately 0.1 gallons/day, a capability that is typical in the industry). This leakage was detected in the SONGS program for monitoring radioactive effluent paths of release to the environment which provides periodic monitoring (collection and measuring activity in a continuous charcoal filter sample on a weekly basis). This leakage detection is not typical in the industry because the SONGS condenser air ejector is a direct release path to the environment and is not diluted by other discharge streams. MonItoring will resume following SON GS Unit 3 restart.
October 30,2008 5
Discussion Points (DP)
DP-2) Discuss whether any secondary side pressure tests were performed during the outage and the associated results.
- No secondary side pressure tests were performed.
DP-3) Discuss any exceptions taken to the industry guidelines.
- No exceptions to the industry guidelines were taken October 30, 2008 6
Discussion Points (DP)
DP-4) Description of Inspections Performed Bobbin Exam or Rotating Exams (+Point)
- Full Length Exam of In-Service Tubes (100 % )
Rotating Exams (+Point)
- Hot Leg top-of-tubesheet locations (100 % ) (TSH-13.00")
- Cold Leg top-of-tubesheet locations (28%) (TSC-13.00")
- Rows 1-3 U-Bend Locations (100 % )
- Rows 4-10 U-Bend Locations (200/0)
- Special Interest Locations - 3600 locations
- Non-quantifiable bobbin indications (I-Codes) - 139 locations
- Dents > 2 volts (100 % ) - 744 locations
- Dings > 4 volts (100 % ) - 937 locations
- Tube wear at supports (100%) - 1770 locations October 30, 2008 7
DP-5) Inspection Results SG88 SG89 TSH eire, Axial -10 -8 TSC Cire, Axial -0 -0 Freespan Axial -0 -0 Tube Support Axial -0 -0 Tube Support Wear (~44% TW) -0 -0 Tube Support Wear (Preventative) -10 -4 Foreign Object (Preventative) -0 -4 Misc. -0 -0 Total Repairable Tubes -20 -16 October 30, 2008 8
DP-5) Inspection Results (Last Outage)
Previous Outage for Comparison SG88 SG89 TSH Circ, Axial 5 2 TSC Circ, Axial 0 0 Freespan Axial 0 0 Tube Support Axial 0 0 Tube Support Wear (2:44% TW) 0 0 Tube Support Wear (Preventative) 23 8 Tubes with Data Quality/ ALARA 1 1 Complications Total Repairable Tubes 29 11 October 30, 2008 9
DP-5) Top Indications by Voltage SG 88 Top 2 Indicsllons by Voltage pp C Pressure Row Col Volts Ind Origin Elev Inch Length Depth PDA FLDA A Leak Test Test 2 40 0.77 SAl 10 TSH -3.87 0.28 61 55.57 No No 38 112 0.71 SAl ID TSH -1.31 0.77 51 43.48 No No 22 34 0.69 SCI 10 TSH -0.11 68 3.48 26 No No 8 42 0.58 SCI lD TSH -2.84 54 2.71 26 No No
_ .. _--------
SG 89 Top 2 Indications by Voltage pp C Pressure Row Col Volts lnd Origin Elev Inch Length Depth PDA FLDA A Leak Test Test 10'\ 69 0.93 SCI 10 TSH -0. i 1 70 5.19 51 No No 113 99 0.78 SAl ID TSH -7.78 0.17 54 45.35 No No 103 69 0.69 SCI ID TSH -0.09 53 2.58 26 No No 103 69 0.68 SCI 10 TSH -0.07 53 4.25 30 No No October 30, 2008 10 .
Discussion Points (DP)
DP-6) Repair/Plugging Plans
- All indications exceeding Technical Specification repair criteria (>440/0 through wall)
- All crack-like Indications
- Quantified (Percent) Wear Indications
- >25% At tube support locations Diagonal Bar Hot and Diagonal Bar Cold
- >300;0 At all other support locations
- Circumferentially oriented indications will be ~tabilized October 30,2008 11
Discussion Points (DP)
DP-7) In-situ Pressure Test and Tube Pull Plans
- Utilizing latest EPRI guidelines for candidate selection and testing
- All tubes meeting criteria will be tested
- No tubes have been selected to date this outage based on EPRI screening criteria
- No tube pulls are planned based on inspection results October 30, 2008 12
Discussion Points (DP)
DP-8) Discuss Foreign Objects
- What Inspections are performed to detect foreign objects?
- Secondary Side Visual Exam (FOSAR)
- 100% By Bobbin Probe or rotating +Point
- 1000/0 TSH with rotating +Point
- 100 % TSC periphery with rotating +Point
- 20% TSC of remaining tubes with rotating +Point
- A description of any foreign objects detected and their location within the SG
- Found one foreign object on the top-of-tubesheet in the SG89 cold leg stay cylinder region. Appears to be approximately 1.25 inch diameter round washer between 2 tubes.
October 30, 2008 13
Discussion Points (DP)
DP-8) Discuss Foreign Objects
- If the loose parts were removed from the SG
- No, removal efforts were unsuccessful. Part is firmly rodged. Neighboring tubes will be removed from service.
- Indications of the tube damage associated with the foreign object
-None
- Source or nature of the loose parts, if known
- Unknown October 30, 2008 14
Discussion Points (DP)
DP-9) Secondary side inspection and maintenance activities
- Visual inspection for foreign objects (Both SGs)
- No sludge lancing this outage
- No other secondary side maintenance activities October 30, 2008 15
Discussion Points (DP)
DP-10) New Inspection Findings
- During the 3C15 inspection, no damage mechanisms that were new to SONGS-3 were detected
- All mechanisms were previously detected and included in the degradation assessment and the operational assessment.
- A planned eddy current follow-up on industry experience (diagonal bar tube support degradation) was successfully complete in both Unit 3 SGs. The diagonal bars that cross the stay cylinder region have been verified in 3C14 (2006) and 3C15 (2008), by bobbin probe eddy current, to be in their normal October 30, k:Meations. 16
Discussion Points (DP)
DP-11) Schedule for SG Related Activities.
during Remainder of Current Outage
- 10/30/08: Complete Eddy Current
- 10/31/08: Complete In-Situ Testing, If Any
- 11/02/08: Complete Repairs October 30,2008 17
December 3, 2008 Mr. Ross T. Ridenoure Senior Vice President and Chie'f Nuclear Officer Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 SUB~IECT: SAN ONOFRE NUCLEAR GENERATING STATION, UNIT 3 -
SUMMARY
OF OCTOBER 31,2008, DISCUSSIONS ON STEAM GENERATOR TUBE INSPECTIONS (TAC NO. MD9640)
Dear Mr. Ridenoure:
On October 31,2008, the U.S. Nuclear Regulatory Commission (NRC) staff participated in a conference call with Southern California Edison (SCE) representatives, R. Coe, A. Matheny, and A. Brough, regarding the 2008 steam generator tube inspections at San Onofre Nuclear Generating Station, Unit 3. A summary of the October 31,2008, conference call is provided in the enclosure; the information supplied by SCE, in support of these discussions (handouts), is provided in an attachment to the enclosure. The NRC staff did not identify any issues that would warrant preventing the plant from starting up following its 15th refueling outage.
If you have any questions, please call me at (301) 415-1480.
Sincerely, IRA!
N. Kalyanam, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-362
Enclosure:
- 1) Summary of conference call
- 2) Handouts cc w/encl: Distribution via ListServ DISTRIBUTION:
PUBLIC LPLIV Reading RidsAcrsAcnw_MailCTR RidsNrrDorlLpl4 RidsN rrLAG Lappert RidsNrrPMSanOnofre RidsOgcRp RidsRgn4MailCenter KKarwoski, NRR/DCI/CSGB AJohnson, NRRIDCI/CSGB ADAMS Accession Nos. ML083240811, OFFICE " DCI/CDSB/BC*
NAME AHiser DATE