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MONTHYEARML1007101132010-03-10010 March 2010 Task Order No. 002 Under Delivery Order No. NRC-03-10-070 Project stage: Acceptance Review ML1007101142010-03-10010 March 2010 Task Order No. 002 Under Delivery Order No. NRC-03-10-070 Project stage: Acceptance Review ML1013201872010-05-18018 May 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application Project stage: RAI ML1013806142010-05-24024 May 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Scoping and Screening Methodology Project stage: RAI ML1015404192010-06-14014 June 2010 Letter Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1016201872010-06-21021 June 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1016901302010-06-29029 June 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1017601042010-07-0606 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application Project stage: RAI ML1017602432010-07-14014 July 2010 RAI Related to the Review of the DCPP LRA - Aging Management Programs Project stage: RAI ML1018301312010-07-15015 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Scoping and Screening and Aging Management Review Project stage: RAI ML1018908322010-07-16016 July 2010 Audit Report Regarding the Diablo Canyon Nuclear Power Plant License Renewal Application Scoping and Screening Methodology Project stage: Other ML1018700882010-07-19019 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1019004702010-07-20020 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 & 2, LRA (Tac Nos. ME2896, and ME2897) - Scoping and Screening Project stage: RAI ML1018802552010-07-20020 July 2010 RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Reactor Vessel Internals Project stage: RAI ML1018301442010-07-20020 July 2010 RAI Related to the Review of the DCPP LRA - Aging Management Programs and Aging Management Review Project stage: RAI ML1018900212010-07-22022 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application - Aging Management Review and Time Limited Aging Analysis Project stage: RAI ML1018807352010-07-22022 July 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application - Aging Management Review and Aging Management Programs Project stage: RAI ML1020004882010-08-0303 August 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Review and Aging Management Programs Project stage: RAI ML1020402512010-08-0909 August 2010 RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Scoping and Screening and Aging Management Review Project stage: RAI ML1016903212010-08-11011 August 2010 Audit Report for Plant Aging Management Programs for DCPP, Units 1 and 2 Project stage: Other ML1019606442010-08-13013 August 2010 Safety Project Manager Change for the License Renewal Project for Diablo Canyon Nuclear Power Plant (TAC ME2896 and ME2897) Project stage: Other ML1021705242010-08-25025 August 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Metal Fatigue Project stage: RAI ML1020107002010-08-26026 August 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Time Limited Aging Analyses and Aging Management Programs Project stage: RAI ML1022402772010-08-26026 August 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1022905422010-08-30030 August 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Review and Time Limited Aging Analyses Project stage: RAI ML1023607492010-09-0101 September 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Programs Project stage: RAI ML1024300272010-09-13013 September 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. Me 2869 and ME2897) - Scoping and Screening Project stage: RAI ML1025202782010-09-17017 September 2010 RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Scoping and Screening Project stage: RAI ML1024600502010-09-17017 September 2010 RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 & ME2897) Aging Management Programs Project stage: RAI ML1025102972010-09-23023 September 2010 RAI Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Time Limited Aging Analyses Project stage: RAI ML1024601512010-09-28028 September 2010 Summary of Telephone Conference Call Held on 9/2/10 Between Us NRC and Pacific Gas and Electric Company Concerning the Response to RAIs Related to the Diablo Canyon Nuclear Power Plant Units 1 and 2 LRA Project stage: RAI ML1025202642010-09-29029 September 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application - Aging Management Review Project stage: RAI ML1026605412010-09-30030 September 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Fire Protection Project stage: RAI ML1029806892010-11-0202 November 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Time Limited Aging Analysis Project stage: RAI ML1029306302010-11-0303 November 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application - Aging Management Programs Project stage: RAI ML1034810132010-12-20020 December 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 and ME2897) - Aging Management Program and Time Limited Aging Analysis Project stage: RAI ML1034104342010-12-20020 December 2010 Request for Additional Information Related to the Review of the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC ME2896 and ME2897) - Time Limited Aging Analysis Project stage: RAI ML1034904172011-01-10010 January 2011 12/1/10 Summary of Telephone Conference Call Held Btw the USNRC and Pacific Gas and Electric Company Concerning Draft Request for Additional Information Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA Project stage: Draft RAI ML1035603212011-01-10010 January 2011 12/8/10 Summary of Telephone Conference Call Held Btw the USNRC and Pacific Gas and Electric Company Concerning Requests for Additional Information Response Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Ap Project stage: RAI ML1034306232011-01-11011 January 2011 Summary of Telephone Conference Call Held Between NRC and PG&E Concerning Request for Additional Information Related Tot the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA (TAC Nos. ME2896 & ME2897) Project stage: RAI ML1035506802011-01-11011 January 2011 12/9/10 Summary of Telephone Conference Call Held Between NRC and PG&E Concerning Requests for Additional Information Response Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 & M Project stage: RAI ML1101005882011-01-25025 January 2011 Summary of Telephone Conference Call Held on December 16, 2010, Between the NRC and Pacific Gas and Electric Company Concerning RAI Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA Project stage: RAI ML1101102612011-01-25025 January 2011 Summary of Telephone Conference Call Held on 12/22/2010, Between the NRC and Pacific Gas and Electric Company Concerning Requests for Additional Information Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA (TAC Nos. ME28 Project stage: RAI ML1101204182011-02-0707 February 2011 Summary of Telephone Conference Call Held with NRC and PG&E Concerning Requests for Additional Information Response Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA (TAC Nos. ME2896 & ME2897) Project stage: RAI ML1101400082011-02-0707 February 2011 01/04/11 Summary of Telephone Conference Call Held Between the NRC and PG&E Company Concerning Requests for Additional Information Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, License Renewal Application (TAC Nos. ME2896 Project stage: RAI ML1104105282011-02-14014 February 2011 Summary of Telephone Conference Call Held on 1/19/11 Between the USNRC and PG&E Concerning Open Items Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, Safety Evaluation Report Project stage: Approval ML1104607182011-02-18018 February 2011 January 25, 2011, Summary of Telephone Conference Call Held Between NRC and PG&E Concerning Open Items Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, SER (TAC Nos. ME2896 & 2897) Project stage: Other ML1105907492011-03-17017 March 2011 Summary of Telephone Conference Calls Held on February 2 and 4, 2011, Btw the USNRC and Pacific Gas and Electric Company Concerning RAIs Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA Project stage: RAI ML1108404592011-04-11011 April 2011 Summary of Telephone Conference Calls Held on 2/28/11 and 3/17/11 Btw the USNRC and Pacific Gas and Electric Company Concerning RAIs Related to the Diablo Canyon Nuclear Power Plant, Units 1 and 2, LRA Project stage: RAI ML15217A4812015-09-24024 September 2015 Requests for Additional Information for the Review of the Diablo Canyon Power Plant, Units 1 and 2, License Renewal Application Set-38 TAC Nos. ME2896 and ME2897 Project stage: RAI 2010-08-26
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Category:Letter
MONTHYEARIR 05000275/20230042024-02-0909 February 2024 Integrated Inspection Report 05000275/2023004 and 05000323/2023004 ML24002B1802024-01-29029 January 2024 LRA Audit Plan DCL-24-010, Nuclear Material Transaction Report for New Fuel2024-01-29029 January 2024 Nuclear Material Transaction Report for New Fuel ML24018A0152024-01-29029 January 2024 License Renewal Application Review Schedule Letter ML24017A2492024-01-24024 January 2024 Letter to Neil Peyron, Chairman, Tule River Tribe, Re. Diablo Canyon ML24024A1752024-01-24024 January 2024 Letter to Tribal Council San Luis Obispo County Chumash Indians on Section 106 Consultation and Scoping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24003A8902024-01-24024 January 2024 Letter to P. Gerfen - Diablo Canyon Notice of Intent to Conduct Scoping and Prepare an Environmental Impact Statement ML24012A1582024-01-24024 January 2024 Letter to Hon. Violet Sage Walker, Chairwoman Northern Chumash Tribal Council on Section 106 Consultation and Scoping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24012A0062024-01-24024 January 2024 Achp Scoping Letter for Diablo Canyon License Renewal ML24012A0552024-01-24024 January 2024 Letter to J. Polanco, Shpo, on Request to Initiate Section 106 Consultation and Scooping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24024A1562024-01-24024 January 2024 Letter to Hon. Gabe Frausto, Coastal Band of Chumash Indians on Section 106 Consultation and Scoping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24024A1652024-01-24024 January 2024 Letter to Hon. Mona Olivas Tucker, Yak Tityu Tityu Yak Tilhini Northern Chumas Indians on Section 106 Consultation and Scoping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24024A1612024-01-24024 January 2024 Letter Hon. Gary Pierce, Salian Tribe of Monterey and San Luis Obispo Counties on Section 106 Consultation and Scoping Process for the Environmental Review of Diablo Canyon Nuclear Plant, Unit 1 and 2 License Renewal Application ML24012A0362024-01-24024 January 2024 Request to Initiate Section 106 Consultation and Scoping Process for the Environmental Review License Renewal Application DCL-24-009, Nuclear Material Transaction Report for New Fuel2024-01-17017 January 2024 Nuclear Material Transaction Report for New Fuel DCL-24-008, Schedule Considerations for Review of the DCPP License Renewal Application2024-01-17017 January 2024 Schedule Considerations for Review of the DCPP License Renewal Application DCL-24-004, Supplement to License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b2024-01-15015 January 2024 Supplement to License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b IR 05000275/20230112024-01-12012 January 2024 NRC License Renewal Phase 1 Inspection Report 05000275/2023011 DCL-23-129, Nuclear Material Transaction Report for New Fuel2023-12-27027 December 2023 Nuclear Material Transaction Report for New Fuel ML23326A0122023-12-21021 December 2023 12-21-23 Letter to the Honorable Byron Donalds from Chair Hanson Responds to Letter Regarding 2.206 Petition to Close Diablo Canyon Nuclear Power Plant, Unit 1 ML23341A0042023-12-19019 December 2023 LRA Acceptance Letter ML23352A2342023-12-18018 December 2023 Notification of Age-Related Degradation Inspection (05000275/2024014 and 05000323/2024014) and Request for Information DCL-23-122, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-12-14014 December 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation DCL-23-128, Emergency Plan Update2023-12-13013 December 2023 Emergency Plan Update ML23355A0952023-12-0808 December 2023 License Renewal Application Online Reference Portal DCL-23-125, Core Operating Limits Report for Unit 1 Cycle 252023-12-0606 December 2023 Core Operating Limits Report for Unit 1 Cycle 25 ML23291A2702023-11-28028 November 2023 Letter to Nakia Zavalla, Shpo, the Santa Ynez Band of Chumash Indians; Re., Diablo Canyon ISFSI Initiating Section 106 Consultation ML23320A2442023-11-28028 November 2023 Letter to Kerri Vera, Director of Department of Environmental Protection, Tule River Tribe; Re., Diablo Canyon ISFSI Initiating Section 106 Consultation ML23325A1382023-11-27027 November 2023 ISFSI Tribal Letter to San Luis Obispo County Chumash Indians ML23325A1322023-11-27027 November 2023 ISFSI Tribal Letter to Salian Tribe of Montgomery, San Luis Obispo ML23325A1332023-11-27027 November 2023 ISFSI Tribal Letter to Yak Tityu Tityu Northern Chumash Indians ML23307A0062023-11-27027 November 2023 ISFSI Tribal Letter to Northern Chumash Tribal Council ML24003A7242023-11-27027 November 2023 Independent Safety Committee; Diab Lo Canyon Nuclear Power Plant Operations, Thirty-Third Annual Report on the Safety ML23325A1292023-11-27027 November 2023 ISFSI Tribal Letter to Coastal Band of Chumash ML23320A1502023-11-17017 November 2023 Individual Notice of Consideration of Issuance of Amendment to Facility Operating License, Proposed No Significant Hazards Consideration Determination, & Opportunity for Hearing (Exigent Circumstances) (EPID L-2023-LLA-0155) - LTR DCL-23-121, Supplement to License Amendment Request 23-03, Revision to Technical Specification3.7.8, Auxiliary Saltwater System2023-11-16016 November 2023 Supplement to License Amendment Request 23-03, Revision to Technical Specification3.7.8, Auxiliary Saltwater System ML23296A0982023-11-15015 November 2023 Notification and Request for Consultation Regarding Pacific Gas and Electric Diablo Canyon Independent Spent Fuel Storage Installation Material License Renewal Request (Docket Number: 72-26) DCL-23-120, License Amendment Request 23-03 Revision to Technical Specification 3.7.8, Auxiliary Saltwater (Asw) System2023-11-14014 November 2023 License Amendment Request 23-03 Revision to Technical Specification 3.7.8, Auxiliary Saltwater (Asw) System ML23293A1052023-11-14014 November 2023 Receipt and Availability of License Renewal Application IR 05000275/20230032023-11-13013 November 2023 Integrated Inspection Report 05000275/2023003 and 05000323/2023003 ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV DCL-23-118, License Renewal Application2023-11-0707 November 2023 License Renewal Application ML23318A2102023-10-31031 October 2023 Independent Safety Committee; Thirty-Third Annual Report on the Safety of Diablo Canyon Nuclear Power Plant Operations DCL-2023-520, Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP)2023-10-19019 October 2023 Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP) DCL-23-103, Independent Spent Fuel Storage Installation - Withdrawal of License Amendment Request 22-01, Request for Approval of Alternative Security Measures for Early Warning System2023-10-13013 October 2023 Independent Spent Fuel Storage Installation - Withdrawal of License Amendment Request 22-01, Request for Approval of Alternative Security Measures for Early Warning System IR 05000275/20240152023-10-10010 October 2023 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection (050002752024015 and 050003232024015) 2024-02-09
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24024A2072024-01-24024 January 2024 Inservice Inspection Request for Information IR 05000275/20240152023-10-10010 October 2023 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection (050002752024015 and 050003232024015) ML23249A2782023-09-0606 September 2023 Inservice Inspection Request for Information ML23159A2382023-07-25025 July 2023 Request for Additional Information for the Technical Review of the Application for Renewal of the Diablo Canyon Independent Spent Fuel Storage Installation (Cac/Epid Nos. 001028/L-2022-RNW-0007) ML23159A2372023-07-25025 July 2023 ISFSI Renewal RAI Transmittal Letter Enclosure ML23096A1792023-04-0606 April 2023 NRR E-mail Capture - Request for Additional Information Diablo Canyon Exemption Request Regarding Senior Reactor Operator License Application ML23047A0062023-02-21021 February 2023 Request for Additional Information Alternative Security Measures for Early Warning System (EPID: L-2022-LLA-0029) (Public Version) ML23041A1862023-02-17017 February 2023 Request for Information Regarding Diablo Canyon Power Plant, Units 1 and 2 - December 8, 2022, Public Meeting ML22258A1112022-09-14014 September 2022 2022 Diablo Canyon PIR Request for Information ML22200A2572022-07-19019 July 2022 Notification of In-service Inspection (Inspection Report 05000323/2022004) and Request for Information ML22187A2652022-07-0606 July 2022 NRR E-mail Capture - Request for Additional Information: Diablo Canyon Exemption Request for Part 73 force-on-force Training Due to COVID-19 ML22152A1502022-06-21021 June 2022 Request for Additional Information Regarding License Amendment Request for Technical Specifications and Revised License Conditions for the Permanently Defueled Condition ML22122A1412022-05-0505 May 2022 .02 Doc Request ML22068A2312022-03-17017 March 2022 Notification of NRC Design Bases Assurance Inspection (Team) 05000275/2022011 and 05000323/2022011 and Initial Request for Information ML22061A2192022-03-0202 March 2022 NRR E-mail Capture - Request for Additional Information - Diablo Canyon Proposed Changes to Emergency Plan for post-shutdown and Permanently Defueled Condition ML21363A1692021-12-29029 December 2021 Inservice Inspection Request for Information ML22019A0412021-12-29029 December 2021 RFI ML21215A3432021-08-0303 August 2021 NRR E-mail Capture - Request for Additional Information - Diablo Canyon Request to Revise Technical Specification 3.8.1, AC Sources - Operating to Support Diesel Fuel Oil Transfer System Component Planned Maintenance ML21130A3642021-06-21021 June 2021 DC 2021401 Information Request ML21104A3642021-04-14014 April 2021 NRR E-mail Capture - Request for Additional Information - Diablo Canyon Proposed Technical Specifications and Revised License Conditions for the Permanently Defueled Condition ML21062A0642021-03-0202 March 2021 NRR E-mail Capture - Request for Additional Information for Diablo Canyon Generic Letter 2004-02 Submittal (L-2017-LRC-0000) ML20329A0692020-11-23023 November 2020 NRR E-mail Capture - Request for Additional Information: Diablo Canyon COVID-19 Exemption Request to Extend force-on-force Exercise ML20323A4532020-11-18018 November 2020 NRR E-mail Capture - Request for Additional Information: Diablo Canyon COVID-19 Exemption Request to Extend Firearms Requalification ML20301A2212020-10-27027 October 2020 Notification of an NRC Fire Protection Baseline Inspection (NRC Inspection Report 05000275/2021010 and 05000323/2021010) and Request for Information ML20261H4232020-09-17017 September 2020 NRR E-mail Capture - Request for Additional Information: Diablo Canyon Unit 2 Fall 2019 Steam Generator Tube Inspection Report ML20231A2372020-08-17017 August 2020 NRR E-mail Capture - Diablo Canyon Additional Request for Additional Information: Exigent License Amendment Request for Application to Provide a New Technical Specification 3.7.5, Auxiliary Feedwater System, Condition G EPID: L-2020-LLA-017 ML20230A0732020-08-14014 August 2020 NRR E-mail Capture - Diablo Canyon Request for Additional Information: Exigent License Amendment Request for Application to Provide a New Technical Specification 3.7.5, Auxiliary Feedwater System, Condition G ML20280A5432020-06-0303 June 2020 DC 2020 PIR Request for Information ML20041E6012020-02-10010 February 2020 NRR E-mail Capture - Diablo Canyon Nuclear Power Plant, Units 1 and 2 - Request for Additional Information for Post -Shutdown Decommissioning Activities Report (PSDAR) ML19262G7482019-08-0909 August 2019 Request for Information ML19149A6012019-05-28028 May 2019 NRR E-mail Capture - Request for Additional Information (Supplemental) - License Amendment Request (LAR) to Revise Emergency Plan Response Organization Staffing and Augmentation ML19123A2162019-05-0202 May 2019 NRR E-mail Capture - Diablo Canyon Nuclear Power Plant -Request for Exemption from Operator Written Examination and Operating Test - Request for Additional Information ML19084A2572019-03-21021 March 2019 NRR E-mail Capture - Request for Additional Information - License Amendment Request (LAR) to Revise Emergency Plan Response Organization Staffing and Augmentation ML19043A9452019-02-20020 February 2019 Notification of Inspection (NRC Inspection Report 05000275/2019002, 05000323/2019002 and Request for Information ML17306A9382017-11-0202 November 2017 NRR E-mail Capture - Request for Additional Information - Request for Approval for Application of Full Weld Overlay REP-RHR-SWOL, Diablo Canyon Power Plant, Units 1 and 2 ML17152A3192017-06-0101 June 2017 NRR E-mail Capture - Request for Additional Information (RAI)- Relief Requests NDE-SLH U2, NDE-LSL U2, NDE-LHC U2, NDE-LHM U2, and NDE-ONV U2 (CAC Nos. MF9386 Through MF9390) ML17102B6072017-04-12012 April 2017 NRR E-mail Capture - Request for Additional Information (RAI) - Revised Emergency Action Level Schemes Pursuant to Nuclear Energy Institute (NEI) 99-01, Revision 6 ML16347A0032016-12-0909 December 2016 NRR E-mail Capture - Request for Additional Information (RAI) - Diablo Canyon Power Plant License Amendment Request for Adoption of NEI 94-01 ML16326A3562016-11-21021 November 2016 NRR E-mail Capture - Request for Additional Information - License Amendment Request to Adopt Nuclear Energy Institute (NEI) 94-01, Revision 2-A for Diablo Canyon Power Plant, Units 1 and 2 - CAC Nos. MF7731 and MF7732 ML16048A2322016-02-17017 February 2016 NRR E-mail Capture - Diablo Canyon 1 and 2 - Met Data Second Round of Requests for Additional Information for License Amendment Request 15-03 to Adopt the Alternative Source Term Per 10 CFR 50.67 (TAC Nos. MF6399 and MF640 ML16011A3652016-02-0202 February 2016 Requests for Additional Information for the Review of the Diablo Canyon Power Plant, Units 1 and 2, License Renewal Application - Set 39 (TAC Nos. ME2896 and ME2897) ML16011A3172016-01-11011 January 2016 NRR E-mail Capture - Diablo Canyon 1 and 2 - Requests for Additional Information for License Amendment Request 15-03 to Adopt the Alternative Source Term Per 10 CFR 50.67 ML15358A0022015-12-23023 December 2015 Request for Additional Information Email (Follow-up Pra), Request to Adopt National Fire Protection Association NFPA 805, Performance-Based Standard for Fire Protection for LWR Generating Plants (2001 Edition) ML15357A3822015-12-23023 December 2015 Request for Additional Information, Round 4 - Amendment Request to Replace Digital Process Protection System for Reactor Protection System and Engineered Safety Features Actuation System Functions ML15295A3732015-11-0505 November 2015 Requests for Additional Information Related to the Diablo Canyon LRA Environmental Review ML15287A1652015-10-23023 October 2015 Requests for Additional Information Related to the Diablo Canyon LRA Environmental Review - SAMA ML15267A7742015-10-0101 October 2015 Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1 Seismic Evaluations ML15217A4812015-09-24024 September 2015 Requests for Additional Information for the Review of the Diablo Canyon Power Plant, Units 1 and 2, License Renewal Application Set-38 TAC Nos. ME2896 and ME2897 ML15238B7742015-08-27027 August 2015 Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Seismic Reevaluations ML15153A0332015-06-29029 June 2015 Request for Additional Information Associated with Near-Term Task Force Recommendation 2.1, Seismic Reevaluations 2024-01-24
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555'()001 November 2,2010 Mr. John Conway Senior Vice President Generation and Chief Nuclear Officer Pacific Gas and Electric Company 77 Beale Street, MC B32 San Francisco, CA 94105
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVIEW OF THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897) - TIME LIMITED AGING ANLYSIS
Dear Mr. Conway:
By letter dated November 23, 2009, Pacific Gas & Electric Company submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew the operating licenses for Diablo Canyon Nuclear Power Plant, Units 1 and 2, for review by the U.S. Nuclear Regulatory Commission (NRC or the staff). The staff is reviewing the information contained in the license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review.
The request for additional information was discussed with Mr. Terry Grebel, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me at 301-415-1045 or bye-mail at nathaniel.ferrer@nrc.gov.
Sincerely, Nathaniel Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosure:
As stated cc w/encl: Distribution via Listserv
Diablo Canyon Nuclear Power Plant, Units 1 and 2 License Renewal Application Request for Additional Information Set 30 Time Limited Aging Analysis - Clarification on Responses Based on the U.S. Nuclear Regulatory Commission (NRC or the staff's) review of Pacific Gas and Electric Company (PG&E or the applicant's) response dated September 24,2010, please provide responses to the following:
RAI4.7.5-2 (follow up)
By letter dated September 24, 2010, in response to request for additional information (RAI) 4.7.5-2, item 4, the applicant stated that the indication in residual heat removal piping WIC-95 is connected to the inside surface and that the flaw was characterized as a construction-related flaw and was not service induced.
Questions:
- 1. The staff noted that the original flaw may be a fabrication defect embedded in the wall thickness. However, the flaw appears to have grown to the pipe surface. Therefore, the flaw should be considered service-induced. Without loading from system operations, the flaw would not have grown to the surface. Explain why an inside surface-connected flaw is not considered to be a service-induced flaw.
- 2. Explain the degradation mechanism that appears to have caused the flaw to open to the pipe surface.
- 3. The flaw evaluation in the applicant's submittal dated May 7, 1997, as shown in the Plant Aging Management Document Retrieval and Research System does not provide a detailed discussion on the flaw growth calculation. It appears that the flaw evaluation dated May 7, 1997, was based on only the fatigue degradation mechanism. However, as the flaw has reached the inside surface of the pipe, the flaw growth appears to be caused by degradation mechanisms other than fatigue.
(a) Justify why the fatigue degradation mechanism is adequate for the surface connected flaw without considering the stress corrosion cracking degradation mechanism which has a higher growth rate than the fatigue mechanism.
(b) Justify the flaw growth rate used in light of the actual flaw growth based on the operating experience.
(c) Discuss the flaw growth calculations in detail.
(d) Provide the flaw growth rate used in the calculation and its reference.
- 4. Provide the flaw evaluation of the subject pipe as shown in PG&E Letter DCL-97-086 dated May 7, 1997.
- 5. Provide the nominal pipe size, the pipe wall thickness, outside diameter of the pipe, pipe material specification, material specification of weld WIC-95.
ENCLOSURE
-2 RAI 4.7.5-3 (follow up)
By letter dated September 24, 2010, in response to RAI 4.7.5-3, item 2, the applicant stated that the indication in the Unit 2 auxiliary feedwater piping line 567 was surface-connected, not embedded. Discuss whether the indication is connected to the inside surface or outside surface of the auxiliary feedwater pipe.
RAI4.7.5-3 (follow up)
By letter dated September 24, 2010, in response to RAI 4.7.5-3, item 4, the applicant stated that it has no plans to conduct any further inspections on the Unit 2 auxiliary feedwater line 567 because (1) it [the additional inspection1 is not required, (2) the flaw is a fabrication defect and is not service-related, and (3) a follow-up examination showed there was no change in the flaw.
Questions:
- 1. A fabrication defect usually is embedded in the pipe or weld wall thickness. If the flaw reaches the surface, it is driven by service-induced loading. Explain why the flaw is not service related.
- 2. The staff does not agree with the applicant's reasons for not inspecting the Unit 2 auxiliary feedwater line 567. The applicant stated that the flaw is a fabrication defect and is not service-related. The staff does not agree with this assessment because the applicant indicated that the flaw is connected to the pipe surface. If a flaw is connected to the surface, the flaw propagation is most likely to be service-related. A fabrication flaw would not be connected to the pipe surface because a surface-connected fabrication defect would have been removed during the construction to satisfy the requirements of the ASME Code,Section III. The applicant stated that a follow-up examination showed there was no change in the flaw. Even though there was no growth in the follow-up examination, this result does not imply that the flaw would not grow in the future. In the future, the flaw may extend to an unfavorable stress region of the pipe wall and the flaw growth may initiate at a later date. The subject flaw is connected to the pipe surface which means that environmental impact on the flaw may exacerbate its growth in the long term. The staff does not believe the original flaw evaluation included the environmental impact on the flaw growth.
In light of the above concerns, the applicant's response to RAI4.7.5-3, item 4, does not provide a reasonable assurance that the flaw in the Unit 2 auxiliary feedwater piping line 567 would not grow and that the structural integrity of the subject piping will be maintained in the future. Provide additional technical basis for not examining the surface-connected flaw.
-3
- 3. It appears that the flaw evaluation of the Unit 2 auxiliary feedwater line 567 dated October 22, 1999, was based on only the fatigue degradation mechanism. However, as the flaw has reached to the surface of the pipe, the flaw growth appears to be caused by degradation mechanisms other than fatigue.
(a) Justify why the fatigue degradation mechanism is adequate for the surface connected flaw without considering the stress corrosion cracking degradation mechanism which has a higher growth rate than the fatigue.
(b) Justify the flaw growth rate used in light of the actual flaw growth based on the operating experience.
(c) Provide the flaw growth rate used in the analysis and associated reference.
November 2, 2010 Mr. John Conway Senior Vice President Generation and Chief Nuclear Officer Pacific Gas and Electric Company 77 Beale Street, MC B32 San Francisco, CA 94105
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVIEW OF THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897) - TIME LIMITED AGING ANLYSIS
Dear Mr. Conway:
By letter dated November 23, 2009, Pacific Gas & Electric Company submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54, to renew the operating licenses for Diablo Canyon Nuclear Power Plant, Units 1 and 2, for review by the U.S. Nuclear Regulatory Commission (NRC or the staff). The staff is reviewing the information contained in the license renewal application and has identified, in the enclosure, areas where additional information is needed to complete the review.
The request for additional information was discussed with Mr. Terry Grebel, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me at 301-415-1045 or bye-mail at nathaniel.ferrer@nrc.gov.
Sincerely, IRA!
Nathaniel Ferrer, Project Manager Projects Branch 2 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-275 and 50-323
Enclosure:
As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
See next page ADAMS Accession No'.. ML102980689 *concurrence via e-mail OFFICE' LA:DLR PM:RPB2:DLR BC:RPB2:DLR PM:RPB2:DLR NAME IKing
- NFerrer DWrona NFerrer DATE 10/27/10 10/28/10 11/02/10 11/02/10 OFFICIAL RECORD COpy
Letter to J. Conway from N. Ferrer dated November 2, 2010
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE REVIEW OF THE DIABLO CANYON NUCLEAR POWER PLANT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC NOS. ME2896 AND ME2897) - TIME LIMITED AGING ANLYSIS DISTRIBUTION:
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