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MONTHYEARML0721500462007-08-0101 August 2007 Third Ten-Year Inservice Inspection (ISI) Interval Request ISI-3-28 48-Hour Hold Period Project stage: Request ML0724300042007-09-13013 September 2007 Request for Additional Information - Relief Request ISI-3-27, Use of Structural Weld Overlay and Associated Alternative Repair Techniques (Tac Nos. MD4580 and MD4581) Project stage: RAI ML0726808432007-09-21021 September 2007 Response to Request for Additional Information Regarding Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-27 Project stage: Response to RAI ML0732404372007-12-13013 December 2007 Request for Relief ISI-3-28 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Re Performance of Structural Weld Overlays (Tac Nos. MD6256 & MD6257) Project stage: Other ML0732500042007-12-13013 December 2007 RR ISI-3-27 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Related to Performance of Structural Weld Overlays (TACs MD4580 & MD4581) Project stage: Acceptance Review ML0824700242008-08-29029 August 2008 Correction to Third Ten-Year Inservice Inspection (ISI) Interval Requests ISI-3-27 and ISI-3-28, Use of Structural Weld Overlay and Associated Alternative Repair Techniques Project stage: Request ML0824609302008-09-0808 September 2008 Corrections to Safety Evaluations Issued for Approval to Use Alternative to the Requirements for Repair / Replacement Activities Related to the Performance of Structural Weld Overlays (TAC Nos. MD458.. Project stage: Approval 2007-09-13
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Category:Code Relief or Alternative
MONTHYEARML13035A1882013-04-29029 April 2013 Relief Request ISI-3-36, Reactor Coolant Pressure Boundary Testing, Third 10-Year Inservice Inspection Interval ML12341A2782012-12-0404 December 2012 Relief Request: American Society of Mechanical Engineers (Asme), Code Case N-770-1 ML12250A6422012-10-15015 October 2012 Correction to Relief Request ISI-3-35, Use of Subsequent Edition of ASME OM Code for Snubbers Program, for 3rd and 4th 10-Year Inservice Inspection Intervals ML12179A4922012-07-20020 July 2012 Relief Request ISI-3-35, Use of Subsequent Edition of ASME OM Code for Snubbers Program, for 3rd and 4th 10-Year Inservice Inspection Intervals ML1127300742011-11-0404 November 2011 Relief Requests ISI-3-32, ISI-3-33, and ISI-3-34, Alternative to Requirements for Examinations of Welds and Core Support Structure Surfaces, Third 10-Year Inservice Inspection ML0927901532009-10-0202 October 2009 Revision 1 to Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-29, Inspection of Reactor Vessel Head Control Element Drive Mechanism Nozzles ML0927901552009-10-0202 October 2009 Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-30, Inspection of Reactor Vessel Head In-Core Instrument Nozzles ML0836403752009-01-23023 January 2009 Relief Requests ISI-3-27, Revision 1, and ISI-3-28, Revision 1, for the Application of Weld Overlay on Dissimilar and Similar Metal Welds ML0832201312008-11-12012 November 2008 Revision to Third Ten-Year Inservice Inspection (ISI) Interval Requests ISI-3-27 and ISI-3-28, Use of Structural Weld Overlay and Associated Alternative Repair Techniques ML0824609302008-09-0808 September 2008 Corrections to Safety Evaluations Issued for Approval to Use Alternative to the Requirements for Repair / Replacement Activities Related to the Performance of Structural Weld Overlays (TAC Nos. MD458.. ML0732404372007-12-13013 December 2007 Request for Relief ISI-3-28 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Re Performance of Structural Weld Overlays (Tac Nos. MD6256 & MD6257) ML0732500042007-12-13013 December 2007 RR ISI-3-27 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Related to Performance of Structural Weld Overlays (TACs MD4580 & MD4581) ML0713800132007-06-12012 June 2007 Relief Request ISI-3-25 - Third 10-Year Inservice Inspection Interval Re Use of Structural Weld Overlay and Associated Alternative Repair Techniques ML0713707402007-06-12012 June 2007 Relief Request ISI-3-24 Third 10-Year ISI Interval Regarding Four Reactor Coolant System Pressurizer, Dissimilar Metal, Nozzle-to-safe-end Welds Structural Overlay & Alternative Repair Techniques ML0703101542007-02-15015 February 2007 Relief Request for Relief from Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code Concerning Reactor Vessel Head Penetration Repairs ML0701807372007-02-0707 February 2007 Third 10-year Inservice Inspection Interval, Requests for Relief from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code ML0634503472006-12-27027 December 2006 Relief, Relief Request ISI-3-23 for Third 10-Year ISI Interval to Allow Use of American Society of Mechanical Engineers Code Case N-746, MC9433 & MC9434 ML0628500962006-12-21021 December 2006 Request for Relief for the In-Service Inspection Program and Approval to Use the Alternative Requirements of ASME Code Case N-513-2 ML0631103222006-12-14014 December 2006 Request for Relief (RR ISI-3-18) from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code - Third 10-Year ISI Interval ML0632405892006-12-14014 December 2006 Third 10-year Inservice Inspection Interval, Requests for Relief ISI-3-19 and ISI-3-20 from the Requirements of American Society of Mechanical Engineers Boiler and Pressure Vessel Code-TAC MD1128/1129 ML0626204912006-10-0202 October 2006 Request for Relief (ISI-3-16) from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (TAC Nos. MC9433/MC9433) ML0626402822006-10-0202 October 2006 Request for Relief (ISI-3-17) from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (TAC Nos. MC9487/MC9488) ML0622902412006-08-15015 August 2006 Revision to the Duration of Relief Request ISI-3-22 Third 10-Year Inspection Interval, San Onofre Unit 3 ML0613503702006-05-11011 May 2006 Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-21 Requests for Alternative to ASME Code Rules for the Embedded Flaw Repair Process for Control Element Drive Mechanism (CEDM) # 56 ML0613600652006-05-11011 May 2006 Third Ten-Year Inservice Inspection (ISI) Interval Relief Request ISI-3-22 Request for Alternative to ASME Code Rules for the Inside Diameter Structural Weld Overlay Repair Process for Control Element Drive Mechanism (CEDM) # 56 ML0604103232006-02-0808 February 2006 Inservice Inspection Program Relief Request ISI-3-15 ML0602602212006-01-18018 January 2006 Withdrawal of Relief Request ISI-3-10, Revision 1 ML0505600352005-03-0909 March 2005 Evaluation of Relief for Use of Mechanical Nozzle Assemblies as an Alternate to the American Society of Mechanical Engineers Code Repairs ML0506800542005-03-0202 March 2005 Safety Evaluation of Relief for Repair of Pressurizer Sleeves During the Third 10-Year Inservice Inspection (ISI) Interval (Tacs. MC4789 and MC4790) ML0436203412004-12-23023 December 2004 SONGS, Unit 3 - Request for Relief from Requirements of the ASME Code Concerning Reactor Vessel Head Penetration Repairs ML0613503742004-10-31031 October 2004 Attachment 1, Relief Request ISI-3-21 Evaluation of the Acceptability of Embedded Flaw Repair of the Indication in Reactor Vessel Head Penetration No. 56 at SONGS Unit 3 ML0426403392004-09-15015 September 2004 Revision to the Duration of Relief Request ISI-3-7 Third 10-Year Inspection Interval ML0420504262004-07-22022 July 2004 SONGS, Request Relief from Requirements of American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code) Concerning Inservice Inspection (ISI) Program Updates for the Third 10-Year ISI (TAC Nos. MC0334 & MC0335) ML0412604592004-05-0505 May 2004 SONGS, Units 2 & 3, Inservice Inspection Program Relief Request ISI-38, Embedded Flaw Repair Process ML0411401662004-04-21021 April 2004 SONGS, Units 2 and 3, Request for Relief from the Requirements of the ASME Code Concerning Updates to Inservice Testing Program ML0408401282004-03-19019 March 2004 Songs, Units 2 and 3 - Relief Request- Relaxation of the Requirements of Order EA-03-009 Regarding Reactor Pressure Vessel Head Inspections ML0408405762004-03-19019 March 2004 Relief, Requirements of the ASME Boiler and Pressure Vessel Code Concerning Mechanical Nozzle Seal Assemblies ML0302801692003-01-24024 January 2003 Mechanical Nozzle Seal Assembly Type 2 Code Replacement Request for Relief from 10 CFR 50.55a ML0232502022002-11-19019 November 2002 Second Ten-Year Interval Inservice Inspection Program Pressure Retaining Piping Welds Relief Requests B-2-06 & B-2-07 ML0223208152002-09-10010 September 2002 Songs Units 2 & 3, Relief, American Society of Mechanical Engineers (ASME) Boiler & Pressure Vessel Code Concerning Use of Electrical Discharge Machining, MB5251, MB5252 ML0208704592002-03-27027 March 2002 Relief, Mechanical Nozzle Assemblies as an Alternative to American Society of Mechanical Engineers (Amse) Code Repairs ML0133902732002-01-11011 January 2002 SONGS, Units 2 and 3, Request for Relief Regarding Reactor Pressure Vessel Nozzle Examinations (TAC Nos. MB2484 and MB2485) 2013-04-29
[Table view] 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:Safety Evaluation
MONTHYEARML18101A2312018-09-24024 September 2018 SONGS ISFSI Only QAPD Letter ML17311A3642018-04-23023 April 2018 Issuance of Amendments to Change the Physical Security Plan to Reflect an ISFSI - Only Configuration ML17345A6572018-01-0909 January 2018 /2/3 - Issuance of Amendments 169/237/230 Re Change the Defueled Technical Specifications to Reflect Permanent Removal of Spent Fuel from the Spent Fuel Pools (CAC Nos. L53157, L53158, and L53159) ML17310B4822017-11-30030 November 2017 Issuance of Amendments to Revise the Permanently Defueled Emergency Plan (CAC Nos. L53160, L53161, and L53162) ML17300A0422017-11-0909 November 2017 2/3 - Issuance of Amendments 235 and 228 Removal of Cyber Security Plan License Condition (CAC Nos. L53191 and L53192) ML16252A2072017-01-23023 January 2017 Issuance of Amendments 234 and 227 to Revise the Cyber Security Plan Milestone 8 Completion Date in the Facility Operating Licenses (CAC Nos. L53132 and L53133) ML16055A5222016-03-11011 March 2016 San Onofre Nuclear Generating Station, Units 2 and 3 - Issuance of Amendments Modifying Licenses to Allow Changes to Specific Regulatory Guide Commitments ML15027A2392016-01-0505 January 2016 Independent Spent Fuel Storage Installation - Safety Evaluation Issuance of Order and Conforming Amendments Concerning Preemption Authority ML15027A2302016-01-0505 January 2016 Independent Spent Fuel Storage Installation - Cover Letter and Amendment Issuance of Order and Conforming Amendments Concerning Preemption Authority. ML15209A9352015-10-0101 October 2015 LTR-15-0424 - San Onofre Nuclear Generating Station, Units 2 and 3 - Issuance of Amendments to Revise the Cyber Security Plan Milestone 8 Completion Date in the Facility Operating Licenses ML15182A2562015-08-19019 August 2015 NRC Staff Review of San Onofre Nuclear Generating Station, Units 2 and 3 - Review and Preliminary Approval of Irradiated Fuel Management Plan ML15191A4612015-08-10010 August 2015 the Independent Spent Fuel Storage Installation - Review of Changes to the Decommissioning Quality Assurance Program (TAC Nos, MF5215, Mf 5216, and Mf 5217) ML15139A3902015-07-17017 July 2015 Issuance of Amendment for Permanently Shutdown and Defueled Technical Specifications and Certain License Conditions ML15126A4612015-06-0505 June 2015 and the Independent Spent Fuel Storage Installation - Issuance of Amendment Changes to the Emergency Plan ML15105A3492015-06-0505 June 2015 the Independent Spent Fuel Storage Installation - Issuance of Amendments Changes to the Emergency Action Level Scheme ML13268A1652014-08-0101 August 2014 Approval of Safe Storage Shift Manager/Certified Fuel Handler Training Program ML13035A1882013-04-29029 April 2013 Relief Request ISI-3-36, Reactor Coolant Pressure Boundary Testing, Third 10-Year Inservice Inspection Interval ML12215A3992012-10-16016 October 2012 Issuance of Amendment Nos. 226 and 219, Revise Technical Specifications Applicable to Movement of Irradiated and Non-Irradiated Fuel Assemblies in the Containment or Fuel Storage Pool ML12250A6422012-10-15015 October 2012 Correction to Relief Request ISI-3-35, Use of Subsequent Edition of ASME OM Code for Snubbers Program, for 3rd and 4th 10-Year Inservice Inspection Intervals ML1127300742011-11-0404 November 2011 Relief Requests ISI-3-32, ISI-3-33, and ISI-3-34, Alternative to Requirements for Examinations of Welds and Core Support Structure Surfaces, Third 10-Year Inservice Inspection ML1027902802010-10-15015 October 2010 Issuance of Amendment Nos. 224 and 217, Revise Technical Specification 3.8.1, AC Sources - Operating, Condition a to Allow One-time Extension to 10-day Completion Time ML1013201682010-06-30030 June 2010 Issuance of Amendment Nos. 223 and 216, Revise Completion Time in Technical Specification 3.7.5, Auxiliary Feedwater (AFW) System, Based on TSTF-340, Revision 3 ML17010A1052010-02-24024 February 2010 Safety Evaluation by the Office of Federal and State Materials and Environmental Management Programs Related to Amendment No. 165 to Facility Operating License No. DPR-13 San Onofre Nuclear Generating Station, Unit 1 ML0905502312009-03-10010 March 2009 Independent Spent Fuel Storage Installation - Correction to NRC Response to Proposed Changes to the Emergency Plan, Increase in Emergency Response Organization Augmentation Time ML0834700912009-02-0303 February 2009 Issuance of Amendment Nos. 219 and 212, Changes to Adopt TSTF-487, Revision 1, Relocate Departure from Nucleate Boiling Parameters to the Core Operating Limits Report ML0836403752009-01-23023 January 2009 Relief Requests ISI-3-27, Revision 1, and ISI-3-28, Revision 1, for the Application of Weld Overlay on Dissimilar and Similar Metal Welds ML0835309252009-01-13013 January 2009 Independent Spent Fuel Storage Installation, Correction to NRC 11/28/2008 Safety Evaluation, Proposed Changes to the Emergency Plan, Increase in Emergency Response Organization Augmentation Time ML0833300972008-11-28028 November 2008 License Amendments 218 & 211 Regarding Battery and DC Sources Upgrades and Cross-Tie ML0832306082008-11-28028 November 2008 Independent Fuel Storage Installation Proposed Changes to the Emergency Plan - Increase in Emergency Response Organization Augmentation Time (Tac Nos. MD5837 and MD5838) ML0820307202008-08-15015 August 2008 Issuance of Amendment No. 210 Containment Leakage Rate Testing Program ML0806001502008-03-25025 March 2008 Issuance of Amendment Nos. 217 and 209, Revise Technical Specification Surveillance Requirements 3.3.7.3.a and 3.8.1 Degraded Voltage Function Values ML0805905282008-03-18018 March 2008 License Amendment, Revise Technical Specification Surveillance Requirements 3.3.7.3.a and 3.8.1 Degraded Voltage Function Values ML0732500042007-12-13013 December 2007 RR ISI-3-27 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Related to Performance of Structural Weld Overlays (TACs MD4580 & MD4581) ML0732404372007-12-13013 December 2007 Request for Relief ISI-3-28 - Approval to Use Alternatives to the Requirements of ASME Code for Repair/Replacement Activities Re Performance of Structural Weld Overlays (Tac Nos. MD6256 & MD6257) ML0731705292007-11-29029 November 2007 Issuance of Amendment Nos. 215 and 207, Revise TS 5.5.2.11 Related to Steam Generator Tube Surveillance Program, Tube Repair ML0728900122007-10-31031 October 2007 Issuance of License Amendments 214 and 206 Regarding Adoption of Technical Specifications Task Force (TSTF)-448, Revision 3, Control Room Envelope Habitability, Using the Consolidated Line Item Improvement Process ML0725501752007-09-27027 September 2007 Issuance of Amendment Nos. 213 and 205 Request to Revise Fuel Storage Pool Boron Concentration ML0726001582007-09-12012 September 2007 Request to Revise Safety Evaluation for License Amendments 210 and 202 ML0720600102007-07-26026 July 2007 Conforming License Amendment to Incorporate the Mitigation Strategies Required by Section B.5.b. of Commission Order EA-02-026 (Tac Nos. MD4564 and MD4565) ML0713800132007-06-12012 June 2007 Relief Request ISI-3-25 - Third 10-Year Inservice Inspection Interval Re Use of Structural Weld Overlay and Associated Alternative Repair Techniques ML0713707402007-06-12012 June 2007 Relief Request ISI-3-24 Third 10-Year ISI Interval Regarding Four Reactor Coolant System Pressurizer, Dissimilar Metal, Nozzle-to-safe-end Welds Structural Overlay & Alternative Repair Techniques ML0713000182007-06-0505 June 2007 License Amendment, Issuance of Amendment Nos. 212 and 204 to Revise TS 3.7.1, Main Steam Safety Valves Requirements and Actions ML0703803162007-04-0404 April 2007 License Amendments 211 and 203 Regarding Emergency Diesel Generator Fuel Oil Volume Requirements ML0704305722007-02-21021 February 2007 Correction Ltr for the Issuance Relief Request No. ISI-3-23 for Third 10-year Inservice Inspection Interval to Allow the Use of American Society of Mechanical Engineers Code Case N-746 (TAC MD1809/10) ML0703706302007-02-20020 February 2007 Correction Letter for Issuance for Request for Relief Relief Request ISI-3-18, from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code ML0703101542007-02-15015 February 2007 Relief Request for Relief from Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code Concerning Reactor Vessel Head Penetration Repairs ML0701807372007-02-0707 February 2007 Third 10-year Inservice Inspection Interval, Requests for Relief from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code ML0634003592006-12-29029 December 2006 Issuance of Amendments 210 and 202 Full-scope Implementation of an Alternative Accident Source Term ML0631103222006-12-14014 December 2006 Request for Relief (RR ISI-3-18) from the Requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code - Third 10-Year ISI Interval ML0632405892006-12-14014 December 2006 Third 10-year Inservice Inspection Interval, Requests for Relief ISI-3-19 and ISI-3-20 from the Requirements of American Society of Mechanical Engineers Boiler and Pressure Vessel Code-TAC MD1128/1129 2018-09-24
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December 13, 2007Mr. 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 AND UNIT 3 - RE:REQUEST APPROVAL TO USE ALTERNATIVES TO THE REQUIREMENTS OF THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS CODE, SECTION XI, IWA-4000, FOR REPAIR/REPLACEMENT ACTIVITIES RELATED TO THE PERFORMANCE OF STRUCTURAL WELD OVERLAYS (TAC NOS.
MD6256 AND MD6257)
Dear Mr. Rosenblum:
By letter dated August 1, 2007, Southern California Edison Company (SCE, the licensee)submitted Relief Request (RR) ISI-3-28 to use alternatives to the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (Code),Section XI, 1995 Edition through 1996 Addenda, IWA-4000, for repair/replacement activities related to the performance of structural weld overlays at San Onofre Nuclear Generating Station, Units 2 and 3, for the third 10-year inservice inspection (ISI) interval. Specifically, the licensee, requested U.S. Nuclear Regulatory Commission (NRC) approval to modify the 48-hour hold time requirement defined in RR ISI-3-25 and RR ISI-3-27. The licensee, through RR ISI-3-28, proposes to change the requirement to allow performanceof the nondestructive examinations 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after the third temper bead weld layer is completed. The overall effect of the change would be a reduction in the time needed for weld overlay installation.The NRC staff has completed its review and evaluation of RR ISI-3-28 and, as discussed in theenclosed safety evaluation, the staff concludes that the proposed modification of the 48-hour hold time requirement provides an acceptable level of quality and safety. Therefore, pursuant to paragraph 50.55a(a)(3)(i) of Title 10 of Code of Federal Regulations, the staff authorizesRR ISI-3-28 for the third 10-year ISI interval. All other ASME Code,Section XI, requirements for which relief was not specifically requested and approved in this relief request remain applicable, including third-party review by the Authorized Nuclear Inservice Inspector.
R. M. Rosenblum-2-Due to the immediate need of this relief request, verbal authorization for the use of this reliefrequest, in association with RR ISI-3-25 activities, was granted on October 30, 2007. The enclosed safety evaluation provides the documented basis for authorizing relief for RR ISI-3-28 activities associated with RRs ISI-3-25 and ISI-3-27. If you have any questions, please contact N. Kalyanam, Project Manager, at 301-415-1480.Sincerely,/RA/Thomas G. Hiltz, ChiefPlant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket Nos. 50-361 and 50-362
Enclosure:
Safety Evaluation cc w/encl: See next page
ML073240437*No major changes from Staff SEOFFICENRR/LPL4/PMNRR/LPL4/LADCI/CPNB*OGC NRR/LPL4/BCNAMENKalyanamJBurkhardtTChanBKlulanTHiltz DATE12/11/0712/6/0711/14/0712/10/0712/13/07 December 2007San Onofre Nuclear Generating Station Units 2 and 3 cc:Douglas K. Porter, Esquire Southern California Edison Company 2244 Walnut Grove Avenue Rosemead, CA 91770Dr. David Spath, ChiefDivision of Drinking Water and Environmental Management California Dept. of Health Services 850 Marina Parkway, Bldg P, 2 nd FloorRichmond, CA 94804Chairman, 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 General Manager - Resources Riverside Public Utilities City of Riverside, California 3901 Orange Street Riverside, CA 92501Regional Administrator, Region IVU.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064Mr. Michael L. De MarcoSan Diego Gas & Electric Company 8315 Century Park Ct. CP21G San Diego, CA 92123-1548Resident InspectorSan Onofre Nuclear Generating Station 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. BoydCalifornia State Liaison Officer Vice Chair and Commissioner California Energy Commission 1516 Ninth Street, MS 31 Sacramento, CA 95814Mr. Gary ButnerActing Branch Chief Department of Public Health Services Radiologic Health Branch MS 7610, P.O. Box 997414 Sacramento, CA 95899-7414Mr. Ross T. RidenoureVice President and Site Manager Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128Mr. A. Edward SchererDirector, Nuclear Regulatory Affairs Southern California Edison Company San Onofre Nuclear Generating Station P.O. Box 128 San Clemente, CA 92674-0128 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATIONREQUEST FOR RELIEF ISI-3-28SOUTHERN CALIFORNIA EDISONSAN ONOFRE NUCLEAR GENERATING STATION, UNIT 2 AND UNIT 3DOCKET NO. 50-36
21.0 INTRODUCTION
By letter dated August 1, 2007 (Agencywide Documents Access and Management System(ADAMS) Accession No. ML072150046), Southern California Edison (SCE, the licensee) requested U.S. Nuclear Regulatory Commission (NRC) approval to modify the 48-hour hold time requirement defined in Relief Request (RR) ISI-3-25 and RR ISI-3-27. By letter dated June 12, 2007, the NRC approved use of the licensee's RR ISI-3-25, which requires, in part, when ambient temperature temper bead welding is used in weld overlay of dissimilar metal butt welds, the nondestructive examinations (NDE) are required to be conducted at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after the completed overlay has returned to ambient temperature. Similarly, RR ISI-3-27 requires the same condition for the 48-hour hold time. The licensee, through RR ISI-3-28, proposes to change this requirement to allow performance of the NDE 48-hours after the third temper bead weld layer is completed. The overall effect of the change would be a reduction in the time needed for weld overlay installation.
2.0 REGULATORY EVALUATION
Pursuant to Title 10 of the Code of Federal Regulations (10 CFR) paragraph 50.55a(g)(4),American Society of Mechanical Engineers (ASME) Boiler and Pressure Code Class 1, 2, and 3 components (including supports) must meet the requirements, except the design and access provisions and the preservice examination requirements, set forth in the ASME Code,Section XI, "Rules for Inservice Inspection (ISI) of Nuclear Power Plant Components," to the extent practical within the limitations of design, geometry, and materials of construction of the components. The regulations require that inservice examination of components and system pressure tests conducted during the first 10-year interval and subsequent intervals comply with the requirements in the latest edition and addenda of Section XI of the ASME Code incorporated by reference in 10 CFR 50.55a(b) 12 months prior to the start of the 120-month interval, subject to the limitations and modifications listed therein. The ISI code of record for San Onofre Nuclear Generating Station, Units 2 and 3 (SONGS 2 and 3), third 10-year ISI interval, which started in August 2003 and is scheduled to be completedin August 2013, is the 1995 Edition through the 1996 Addenda of Section XI of the ASME Code.Pursuant to 10 CFR 50.55a(a)(3), alternatives to requirements may be authorized by the NRC ifthe licensee demonstrates that: (i) the proposed alternatives provide an acceptable level of quality and safety, or (ii) compliance with the specified requirements would result in hardship orunusual difficulty without a compensating increase in the level of quality and safety. The licensee sets forth in RR ISI-3-28 a proposed alternative that provides an acceptable levelof quality and safety. 10 CFR 50.55a(a)(3)(i) provides the regulatory basis to evaluate the proposed modification.
3.0 TECHNICAL EVALUATION
3.1Requirements For Which Relief Is RequestedBy letter dated July 14, 2006 (ADAMS Accession No. ML061990111), the licensee submittedfor NRC approval RR ISI-3-25, which stated that the licensee would implement Subarticle 4.0(b) of ASME Code Case N-638-1 for Class 1 components. Subarticle 4.0(b) states, in part, that the final weld surface shall be examined using NDE methods when the completed weld has been at ambient temperature for at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. By letter dated June 12, 2007 (ADAMS Accession No. ML071380013), the NRC approved use of ISI-3-25.By letter dated February 21, 2007 (ADAMS Accession No. ML070570433), the licenseesubmitted for NRC approval RR ISI-3-27, which stated that the licensee would implement Subarticle 4.0(b) of ASME Code Case N-638-1 for Class 1 components. By letter dated December 14, 2007 (ADAMS Accession No. ML073250004), the NRC approved use of RR ISI-3-27.3.2Licensee's Proposed AlternativeThe licensee, through RR ISI-3-28, proposes to start the 48-hour hold period beforeperformance of NDE immediately after completion of the third temper bead layer.3.3Components For Which Relief Is Requested (As Provided by the Licensee)RR ISI-3-28 applies to the following components of RRs ISI-3-25 and ISI-3-27:
!RR ISI-3-25 applies to the following ASME Code Class 1 welds:-Unit 2 Pressurizer S21201ME087 surge line nozzle to safe end HSS [highsafety significant] dissimilar metal weld (ISI Designation Number 02-005-031) with Alloy 82/182 weld material subject to PWSCC [primary water stress-corrosion cracking];-The adjacent Unit 2 Pressurizer S21201ME087 stainless steel weld (ISIDesignation Number 02-016-001);-Unit 3 Pressurizer S31201ME087 surge nozzle to safe end HSSdissimilar metal weld (ISI Designation Number 03-005-031) with Alloy 82/182 weld material subject to PWSCC; and -The adjacent Unit 3 Pressurizer S31201ME087 stainless steel weld (ISIDesignation Number 03-016-001).
!RR ISI-3-27 applies to the following ASME Code Class 1 welds from both Units 2 and 3:-Reactor Coolant System Hot Leg surge nozzle to safe end HSS dissimilarmetal welds (ISI Designation Number 02-006-010/03-006-010) with Alloy 82/182 weld material subject to PWSCC;-Reactor Coolant System Hot Leg surge nozzle adjacent stainless steelwelds (ISI Designation Number 02-016-016/03-016-016);-Reactor Coolant System Hot Leg drain nozzle to safe end HSS dissimilarmetal welds (ISI Designation Number 02-006-011/03-006-011) with Alloy 82/1 82 weld material subject to PWSCC;-Reactor Coolant System Hot Leg drain nozzle adjacent stainless steelwelds (ISI Designation Number 02-030-001/03-030-010);-Shutdown Cooling System Hot Leg nozzle to safe end HSS dissimilarmetal weld (ISI Designation Number 02-007-009/03-007-009) with Alloy 82/1 82 weld material subject to PWSCC; and-Shutdown Cooling System Hot Leg nozzle adjacent stainless steel welds(ISI Designation Number 02-021-001/03-021-010).3.4Staff EvaluationCode Case N-638-1 requires that when temper bead welding is used, surface and ultrasonicexaminations shall be performed when the completed weld has been at ambient temperature for at least 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. This delay was provided to allow sufficient time for hydrogen cracking to occur (if it is to occur) in the heat affected zone (HAZ) of ferritic materials prior to performing examinations, to ensure detection of hydrogen cracking by NDE. However, based on research and industry experience, the Electric Power Research Institute (EPRI) has provided a technical basis for starting the 48-hour hold after completion of the third temper bead weld layer rather than waiting 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after the weld overlay cools to ambient temperature. EPRI has documented their technical basis in Technical Update report 1013558, "Repair and Replacement Applications Center: Temperbead Welding Applications 48-Hour Hold Requirements for Ambient Temperature Temperbead Welding" (ADAMS Accession No. ML070670060).After evaluating the issues relevant to hydrogen cracking, such as microstructure of susceptiblematerials, availability of hydrogen, applied stresses, temperature, and diffusivity and solubility of hydrogen in steels, EPRI concluded that "...there appears to be no technical basis for waitingthe 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after cooling to ambient temperature before beginning the NDE of the completed weld. There should be no hydrogen present, and even if it were present, the temper bead welded component should be very tolerant of the moisture ..." EPRI also notes that over 20 weld overlays and 100 repairs have been performed using temper bead techniques onlow-alloy steel components over the last 20 years. During this time, there has never been an indication of hydrogen cracking by the NDEs performed after the 48-hour hold or by subsequent ISIs.An ASME Technical Basis Paper (ADAMS Accession No. ML070790679), supporting theproposed revision to the 48-hour hold time requirement, indicates that the introduction of hydrogen to the ferritic HAZ is limited to the first weld layer, because this is the only weld layer that makes contact with the ferritic base material. The Technical Paper states that while the potential for the introduction of hydrogen to the ferritic HAZ is negligible during subsequent weld layers, these layers provide a heat source that accelerates the dissipation of hydrogen from the ferritic HAZ in nonwater-backed applications. The Technical Basis Paper concludes that there is sufficient delay time to facilitate the detection of potential hydrogen cracking when NDE is performed 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after completion of the third weld layer.Furthermore, the solubility of hydrogen in austenitic weld materials such as Alloy 52M is muchhigher than that of ferritic materials, while the diffusivity of hydrogen in austenitic materials is lower than that of ferritic materials. As a result, hydrogen in the ferritic HAZ tends to diffuse into the austenitic weld metal, which has a much higher solubility for hydrogen. This diffusion process is enhanced by heat supplied in subsequent weld layers.Based on this information, the staff finds that starting the 48-hour hold time after completion ofthe third temper bead weld layer is acceptable. The staff finds that the licensee has provided sufficient technical justification to show that hydrogen cracking in the weld overlay would not likely occur under the proposed alternative. A staff review of operational experience and research in this area has found no technical objection to the proposed alternative. Therefore, the staff finds that it is not necessary to wait until 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after the completed overlay has reached ambient temperature to perform NDE, because any delayed hydrogen cracking, were it to occur, would be expected to occur within the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> following completion of the third temper bead weld layer.
4.0CONCLUSION
The staff has reviewed the licensee's submittal and determined that the proposed modificationto perform NDE of the weld overlay 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> after completion of the third temper bead weld layer will provide an acceptable level of quality and safety. Therefore, pursuant to 10 CFR 0.55a(a)(3)(i), the staff authorizes the use of RR ISI-3-28 as a modification of RR ISI-3-27 and RR ISI-3-25. This relief is authorized through the period of applicability of RRs ISI-3-25 and ISI-3-27, which is through the remainder of the current SONGS 2 and 3 third 10-year ISI interval that started in August 2003 and is scheduled to end in August 2013.This authorization is applicable only when welding is performed in accordance withRRs ISI-3-25 and ISI-3-27 for the full structural weld overlay of dissimilar metal welds and the adjacent welds, identified in Section 3.3 above, at SONGS 2 and 3. Due to the immediate need of this relief request, the NRC staff granted the verbal authorization for the use of this relief request on October 30, 2007. All other ASME Code,Section XI requirements for which relief was not specifically requestedand approved in this relief request remain applicable, including third-party review by the Authorized Nuclear Inservice Inspector.Principal Contributor: J. Collins Date: December 13, 2007