Letter Sequence Response to RAI |
---|
|
|
|
|
---|
Category:Letter type:CNL
MONTHYEARCNL-24-040, Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2024-05-0808 May 2024 Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-24-036, – 10 CFR 50.46 Annual Report2024-04-25025 April 2024 – 10 CFR 50.46 Annual Report CNL-24-037, Clinch River, Sequoyah, Units 1 and 2, Watts Bar, Unit 1 and 2, Nuclear Quality Assurance Plan, TVA-NQA-PLN89-A, Revision 422024-04-22022 April 2024 Clinch River, Sequoyah, Units 1 and 2, Watts Bar, Unit 1 and 2, Nuclear Quality Assurance Plan, TVA-NQA-PLN89-A, Revision 42 CNL-24-024, Hydrologic Engineering Center River Analysis System Project Milestone Status Update2024-04-17017 April 2024 Hydrologic Engineering Center River Analysis System Project Milestone Status Update CNL-24-033, Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2024-04-17017 April 2024 Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-24-017, Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure and Emergency Preparedness Department Procedure Revisions2024-01-17017 January 2024 Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure and Emergency Preparedness Department Procedure Revisions CNL-23-071, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-472024-01-11011 January 2024 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-47 CNL-23-070, Submittal of Fifth 10-Year Interval Inservice Testing Program Plan2023-11-29029 November 2023 Submittal of Fifth 10-Year Interval Inservice Testing Program Plan CNL-23-067, Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2023-11-27027 November 2023 Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-23-061, Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revision2023-09-20020 September 2023 Tennessee Valley Authority - Central Emergency Control Center Emergency Plan Implementing Procedure Revision CNL-23-057, Central Emergency Control Center Emergency Plan Implementing Procedure Revisions. Includes CECC-EPIP-1, Revision 76 and CECC-EPIP-9, Revision 642023-09-0505 September 2023 Central Emergency Control Center Emergency Plan Implementing Procedure Revisions. Includes CECC-EPIP-1, Revision 76 and CECC-EPIP-9, Revision 64 CNL-23-055, Tennessee Valley Authority - Emergency Preparedness Department Procedure Revision. Includes EPDP-3, Revision 3, Emergency Plan Exercises and Preparedness Drills2023-07-25025 July 2023 Tennessee Valley Authority - Emergency Preparedness Department Procedure Revision. Includes EPDP-3, Revision 3, Emergency Plan Exercises and Preparedness Drills CNL-23-053, Tennessee Valley Authority - Radiological Emergency Plan Revisions2023-07-18018 July 2023 Tennessee Valley Authority - Radiological Emergency Plan Revisions CNL-23-025, American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-472023-07-0303 July 2023 American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-47 CNL-23-049, Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan .2023-06-26026 June 2023 Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan . CNL-23-046, Revision to Notice of Intent to Pursue Subsequent License Renewal - Schedule Submittal2023-06-0606 June 2023 Revision to Notice of Intent to Pursue Subsequent License Renewal - Schedule Submittal CNL-23-037, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Request2023-06-0101 June 2023 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Requests CNL-23-042, Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2023-05-16016 May 2023 Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-23-030, Tennessee Valley Authority - Hydrologic Engineering Center River Analysis System Project Milestone Status Update2023-04-27027 April 2023 Tennessee Valley Authority - Hydrologic Engineering Center River Analysis System Project Milestone Status Update CNL-23-032, Clinch River, Sequoyah, Units 1 and 2, Watts Bar, Unit 1 and 2, Nuclear Quality Assurance Plan, TVA-NQA-PLN89-A, Revision 412023-04-27027 April 2023 Clinch River, Sequoyah, Units 1 and 2, Watts Bar, Unit 1 and 2, Nuclear Quality Assurance Plan, TVA-NQA-PLN89-A, Revision 41 CNL-23-034, 10 CFR 50.46 Annual Report2023-04-26026 April 2023 10 CFR 50.46 Annual Report CNL-23-033, Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revision2023-04-24024 April 2023 Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revision CNL-23-029, Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2023-04-11011 April 2023 Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-23-018, Request for Amendment Regarding Technical Specification Surveillance Requirements 3.4.3.2 and 3.5.1.11 Regarding Safety Relief Valves (BFN TS-540)2023-03-30030 March 2023 Request for Amendment Regarding Technical Specification Surveillance Requirements 3.4.3.2 and 3.5.1.11 Regarding Safety Relief Valves (BFN TS-540) CNL-23-023, Annual Insurance Status Report2023-03-30030 March 2023 Annual Insurance Status Report CNL-23-027, Second Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505-A, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b (BFN TS-524)2023-03-29029 March 2023 Second Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505-A, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b (BFN TS-524) CNL-23-022, Decommissioning Funding Status Report2023-03-29029 March 2023 Decommissioning Funding Status Report CNL-23-024, TVA Guarantee of Payment of Deferred Premiums - 2022 Annual Report2023-03-29029 March 2023 TVA Guarantee of Payment of Deferred Premiums - 2022 Annual Report CNL-23-019, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-322023-03-11011 March 2023 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-32 CNL-22-045, Application to Revise Technical Specifications to Adopt TSTF-566-A, Revise Actions for Inoperable RHR Shutdown Cooling Subsystems, and TSTF-580-A, Revision 1, Provide Exception from Entering Mode 42023-03-10010 March 2023 Application to Revise Technical Specifications to Adopt TSTF-566-A, Revise Actions for Inoperable RHR Shutdown Cooling Subsystems, and TSTF-580-A, Revision 1, Provide Exception from Entering Mode 4 CNL-23-021, Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2023-03-0808 March 2023 Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-22-037, Application to Revise Technical Specifications to Adopt TSTF-541-A, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated Position (BFN TS-533)2023-01-31031 January 2023 Application to Revise Technical Specifications to Adopt TSTF-541-A, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated Position (BFN TS-533) CNL-23-003, Browns Nuclear Plant, Units 1, 2 & 3; Sequoyah Nuclear Plant, Units 1 & 2; and Watts Bar Nuclear Plant, Units 1 & 2 - Organizational Topic Report TVA-NPOD89-A2023-01-30030 January 2023 Browns Nuclear Plant, Units 1, 2 & 3; Sequoyah Nuclear Plant, Units 1 & 2; and Watts Bar Nuclear Plant, Units 1 & 2 - Organizational Topic Report TVA-NPOD89-A CNL-23-008, Tennessee Valley Authority Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2022-12-22022 December 2022 Tennessee Valley Authority Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-22-089, License Amendment Request for Adoption of TSTF-478, Revision 2, BWR Technical Specification Changes That Implement the Revised Rule for Combustible Gas Control (BFN TS-546)2022-12-20020 December 2022 License Amendment Request for Adoption of TSTF-478, Revision 2, BWR Technical Specification Changes That Implement the Revised Rule for Combustible Gas Control (BFN TS-546) CNL-22-090, Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Requests for the Fifth Inservice Testing Interval2022-12-12012 December 2022 Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Requests for the Fifth Inservice Testing Interval CNL-22-100, to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3,in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535)2022-12-0909 December 2022 to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3,in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535) CNL-22-097, Response to Request for Additional Information and Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide .2022-12-0101 December 2022 Response to Request for Additional Information and Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide . CNL-22-106, Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revision. Includes CECC EPIP-14, Revision 38, Nuclear Emergency Public Information Organization and Operat2022-11-28028 November 2022 Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revision. Includes CECC EPIP-14, Revision 38, Nuclear Emergency Public Information Organization and Operatio CNL-22-105, Physical Security Plan, Training and Qualification Plan, Safeguards Contingency Plan, and Independent Spent Fuel Storage Installation Security Program, Revision 222022-11-0808 November 2022 Physical Security Plan, Training and Qualification Plan, Safeguards Contingency Plan, and Independent Spent Fuel Storage Installation Security Program, Revision 22 CNL-22-099, Tennessee Valley Authority - Hydrologic Engineering Center River Analysis System Project Milestone Status Update2022-10-31031 October 2022 Tennessee Valley Authority - Hydrologic Engineering Center River Analysis System Project Milestone Status Update CNL-22-098, Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions. Includes CECC EPIP-7, Rev. 45 & CECC EPIP-8, Rev. 552022-10-17017 October 2022 Tennessee Valley Authority - Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions. Includes CECC EPIP-7, Rev. 45 & CECC EPIP-8, Rev. 55 CNL-22-055, Application to Delete Acreage Value Discussion from Technical Specifications (BFN TS-543)2022-09-29029 September 2022 Application to Delete Acreage Value Discussion from Technical Specifications (BFN TS-543) CNL-22-096, to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3, in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535)2022-09-29029 September 2022 to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3, in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535) CNL-22-083, to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3, in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535).2022-09-13013 September 2022 to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for Browns Ferry Nuclear Plant Units 1, 2, and 3, in Support of Atrium 11 Fuel Use at Browns Ferry (TS-535). CNL-22-075, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Unit 2, Request for Alternative, BFN-21-ISI-02, Alternative to American Society of Mechanical Engineers, Boiler and Pressure Vessel Code, Section Xi,.2022-09-12012 September 2022 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Unit 2, Request for Alternative, BFN-21-ISI-02, Alternative to American Society of Mechanical Engineers, Boiler and Pressure Vessel Code, Section Xi,. CNL-22-025, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-322022-08-22022 August 2022 American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-32 CNL-22-077, Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions2022-08-11011 August 2022 Radiological Emergency Plan and Central Emergency Control Center Emergency Plan Implementing Procedure Revisions CNL-22-065, Response to Request for Confirmation of Information and Additional Information and Second Supplement Regarding Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie.2022-08-0101 August 2022 Response to Request for Confirmation of Information and Additional Information and Second Supplement Regarding Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie. CNL-22-076, to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 in Support of Atrium 11 Fuel2022-07-28028 July 2022 to Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 in Support of Atrium 11 Fuel 2024-05-08
[Table view] Category:Response to Request for Additional Information (RAI)
MONTHYEARCNL-23-071, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-472024-01-11011 January 2024 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, Inservice Inspection and Augmented Program Interval Revised Request for Alternative 0-ISI-47 CNL-23-037, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Request2023-06-0101 June 2023 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Request to Use a Later Edition of the American Society of Mechanical Engineers Operation and Maintenance Code and Alternative Requests CNL-23-019, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-322023-03-11011 March 2023 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Units 1, 2, and 3, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Request for Alternative BFN-0-ISI-32 CNL-22-097, Response to Request for Additional Information and Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide .2022-12-0101 December 2022 Response to Request for Additional Information and Supplement to License Amendment Request to Revise Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide . CNL-22-075, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Unit 2, Request for Alternative, BFN-21-ISI-02, Alternative to American Society of Mechanical Engineers, Boiler and Pressure Vessel Code, Section Xi,.2022-09-12012 September 2022 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant, Unit 2, Request for Alternative, BFN-21-ISI-02, Alternative to American Society of Mechanical Engineers, Boiler and Pressure Vessel Code, Section Xi,. CNL-22-065, Response to Request for Confirmation of Information and Additional Information and Second Supplement Regarding Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie.2022-08-0101 August 2022 Response to Request for Confirmation of Information and Additional Information and Second Supplement Regarding Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie. CNL-22-066, Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for in Support of Atrium 11 Fuel Use Supplement 3, Response to Request for Additional Information2022-07-18018 July 2022 Request for License Amendment Regarding Application of Advanced Framatome Methodologies, and Adoption of TSTF-564 Revision 2 for in Support of Atrium 11 Fuel Use Supplement 3, Response to Request for Additional Information CNL-22-064, Response to Request for Additional Information Regarding Tennessee Valley Authority License Amendment Request to Revise Emergency Plan Implementing Procedure Regarding Seismic Event Emergency Action Level Change2022-06-0909 June 2022 Response to Request for Additional Information Regarding Tennessee Valley Authority License Amendment Request to Revise Emergency Plan Implementing Procedure Regarding Seismic Event Emergency Action Level Change CNL-22-007, Supplement to Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie Modification to Support System Operability (BFN-TS-518)2022-04-0606 April 2022 Supplement to Application Requesting NRC Prior Approval of a Proposed Chilled-Water Cross-tie Modification to Support System Operability (BFN-TS-518) CNL-22-028, Response to Request for Additional Information Regarding License Amendment Request Regarding Criticality Safety Analysis of Spent Fuel Pool Storage of Atrium 11 Fuel (TS-534)2022-03-18018 March 2022 Response to Request for Additional Information Regarding License Amendment Request Regarding Criticality Safety Analysis of Spent Fuel Pool Storage of Atrium 11 Fuel (TS-534) CNL-21-052, Response to Request for Additional Information Regarding License Amendment Request to Modify Technical Specification 3.8.6, Battery Cell Parameters (TS-531)2021-07-21021 July 2021 Response to Request for Additional Information Regarding License Amendment Request to Modify Technical Specification 3.8.6, Battery Cell Parameters (TS-531) CNL-21-033, Response to Request for Additional Information Regarding License Amendment Request to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components2021-04-28028 April 2021 Response to Request for Additional Information Regarding License Amendment Request to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components CNL-21-017, Response to Request for Additional Information Regarding License Amendment Request to Incorporate Tornado Missile Risk Evaluator Into the Licensing Basis, (L-2020-LLA-0099)2020-12-29029 December 2020 Response to Request for Additional Information Regarding License Amendment Request to Incorporate Tornado Missile Risk Evaluator Into the Licensing Basis, (L-2020-LLA-0099) CNL-20-089, Response to RAI Re Application for Tech. Specification Change Re Risk-Informed Justification for Relocation of Specific Surveillance Frequency Requirements to a Licensee Controlled Program (BFN-TS-518)2020-12-21021 December 2020 Response to RAI Re Application for Tech. Specification Change Re Risk-Informed Justification for Relocation of Specific Surveillance Frequency Requirements to a Licensee Controlled Program (BFN-TS-518) CNL-20-059, Response to Request for Additional Information Regarding Proposed Alternative Request No. 0-ISI-47 for the Third, Fifth, and Fourth 10-Year Inservice Inspection Intervals2020-08-10010 August 2020 Response to Request for Additional Information Regarding Proposed Alternative Request No. 0-ISI-47 for the Third, Fifth, and Fourth 10-Year Inservice Inspection Intervals CNL-19-122, Seismic Probabilistic Risk Assessment Response to NRC Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights2019-12-17017 December 2019 Seismic Probabilistic Risk Assessment Response to NRC Request for Information Pursuant to Title 10 of the Code of Federal Regulations 50.54(f) Regarding Recommendation 2.1 of the Near-Term Task Force Review of Insights CNL-19-064, Response to NRC Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt Technical Specifications Task Force (TSTF)-542, Reactor Pressure Vessel Water...2019-08-0808 August 2019 Response to NRC Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt Technical Specifications Task Force (TSTF)-542, Reactor Pressure Vessel Water... CNL-19-052, Response to NRC Request for Additional Information Regarding Re-Submittal of American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Inservice Inspection (ISI) Program and Augmented Program, Second2019-07-19019 July 2019 Response to NRC Request for Additional Information Regarding Re-Submittal of American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Inservice Inspection (ISI) Program and Augmented Program, Second CNL-19-017, Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 7, Response to Requests for Additional Information2019-01-25025 January 2019 Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 7, Response to Requests for Additional Information CNL-19-007, Supplement 5, Response to Requests for Additional Information Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus2019-01-16016 January 2019 Supplement 5, Response to Requests for Additional Information Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus CNL-19-011, Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 6, Additional Operator Training Results2019-01-16016 January 2019 Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 6, Additional Operator Training Results CNL-18-139, Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Information2018-12-14014 December 2018 Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Information CNL-18-140, Response to Request for Additional Information Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 42018-12-13013 December 2018 Response to Request for Additional Information Proposed Technical Specifications (TS) Change TS-510 - Request for License Amendments - Maximum Extended Load Line Limit Analysis Plus - Supplement 4 CNL-18-117, Response to Request for Additional Information Regarding Browns Ferry Units 1, 2, and 3: Code Case N-702 for Alternative Request ISI-462018-10-17017 October 2018 Response to Request for Additional Information Regarding Browns Ferry Units 1, 2, and 3: Code Case N-702 for Alternative Request ISI-46 CNL-18-120, Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant Unit 1, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Inservice Inspection (ISI) Program, Unit 1 Second Ten-year ..2018-10-11011 October 2018 Response to Request for Additional Information Regarding Browns Ferry Nuclear Plant Unit 1, American Society of Mechanical Engineers Boiler and Pressure Vessel Code Section XI, Inservice Inspection (ISI) Program, Unit 1 Second Ten-year ... ML18283A8972018-10-10010 October 2018 Enclosure 1: Proposed Changes to Browns Ferry Nuclear Plant Unit 1 Technical Specifications, Attachments 1, 2, & 3 CNL-18-089, Response to Request for Additional Information Regarding Decommissioning Funding Plan Update for Browns Ferry Nuclear Plant and Sequoyah Nuclear Plant Independent Spent Fuel Storage Installations, Docket Nos. 72-052 and 72-0342018-07-23023 July 2018 Response to Request for Additional Information Regarding Decommissioning Funding Plan Update for Browns Ferry Nuclear Plant and Sequoyah Nuclear Plant Independent Spent Fuel Storage Installations, Docket Nos. 72-052 and 72-034 CNL-18-044, Tennessee Valley Authority Response to NRC Request for Additional Information Related to Topical Report TVA-NPG-AWA16, TVA Overall Basin Probable Maximum Precipitation.2018-04-19019 April 2018 Tennessee Valley Authority Response to NRC Request for Additional Information Related to Topical Report TVA-NPG-AWA16, TVA Overall Basin Probable Maximum Precipitation. NL-18-044, Browns Ferry Units 1, 2, and 3; Sequoyah Units 1 and 2; Watts Bar Units 1 and 2 - Tennessee Valley Authority Response to NRC Request for Additional Information Related to Topical Report TVA-NPG-AWA16, TVA Overall Basin Probable Maximum Pre2018-04-19019 April 2018 Browns Ferry Units 1, 2, and 3; Sequoyah Units 1 and 2; Watts Bar Units 1 and 2 - Tennessee Valley Authority Response to NRC Request for Additional Information Related to Topical Report TVA-NPG-AWA16, TVA Overall Basin Probable Maximum Prec CNL-18-032, Tennessee Valley Authority Response to NRC Request for Additional Information (Set 2) Related to BFN Application to Revise Technical Specification 5.5.12 Primary Containment Leakage Rate Testing Program2018-03-27027 March 2018 Tennessee Valley Authority Response to NRC Request for Additional Information (Set 2) Related to BFN Application to Revise Technical Specification 5.5.12 Primary Containment Leakage Rate Testing Program CNL-18-011, Tennessee Valley Authority Response to NRC Request for Additional Information Related to BFN Application to Revise Technical Specification 5.5.12 Primary Containment Leakage Rate Testing Program (BFN-TS-497)2018-02-0505 February 2018 Tennessee Valley Authority Response to NRC Request for Additional Information Related to BFN Application to Revise Technical Specification 5.5.12 Primary Containment Leakage Rate Testing Program (BFN-TS-497) CNL-17-130, Update to Response to NRC Request for Additional Information for License Amendment Request to Revise Modifications and an Implementation Item Related to NFPA 805 Performance-Based Standard for Fire Protection For..2017-10-23023 October 2017 Update to Response to NRC Request for Additional Information for License Amendment Request to Revise Modifications and an Implementation Item Related to NFPA 805 Performance-Based Standard for Fire Protection For.. CNL-17-109, Response to NRC Request for Additional Information for License Amendment Request to Revise Modifications and an Implementation Item Related to NFPA 805 Performance-Based Standard for Fire Protection for Light Water Reactor Electric Genera2017-09-18018 September 2017 Response to NRC Request for Additional Information for License Amendment Request to Revise Modifications and an Implementation Item Related to NFPA 805 Performance-Based Standard for Fire Protection for Light Water Reactor Electric Generati CNL-17-098, Revised Response to NRC Request for Additional Information Related to TVA Fleet License Amendment Request to Adopt NEI 99-01 Revision 6 Emergency Action Levels2017-07-27027 July 2017 Revised Response to NRC Request for Additional Information Related to TVA Fleet License Amendment Request to Adopt NEI 99-01 Revision 6 Emergency Action Levels CNL-17-085, Response to NRC Request for Additional Information Related to TVA Fleet License Amendment Request to Adopt NEI 99-01 Revision 6 Emergency Action Levels2017-07-0707 July 2017 Response to NRC Request for Additional Information Related to TVA Fleet License Amendment Request to Adopt NEI 99-01 Revision 6 Emergency Action Levels CNL-17-039, Response to NRC Request for Information, Per 10CFR50.54(f) Regarding Recommendations 2.1, 2.3 and 9.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-Ichi Accident - Withdrawal of Regulatory..2017-03-10010 March 2017 Response to NRC Request for Information, Per 10CFR50.54(f) Regarding Recommendations 2.1, 2.3 and 9.3 of the Near-Term Task Force Review of Insights from the Fukushima Dai-Ichi Accident - Withdrawal of Regulatory.. CNL-17-035, Proposed Technical Specifications Change TS-505 - Request for License Amendments - Extended Power Uprate(Epu) - Supplement 38, Spent Fuel Pool Criticality Safety Analysis - Updated Information2017-03-0303 March 2017 Proposed Technical Specifications Change TS-505 - Request for License Amendments - Extended Power Uprate(Epu) - Supplement 38, Spent Fuel Pool Criticality Safety Analysis - Updated Information CNL-17-017, Proposed Technical Specifications (TS) Change TS-505 Request for License Amendments - Extended Power Uprate (EPU) - Supplement 37, Transmission System Update - Environmental Aspects2017-02-0303 February 2017 Proposed Technical Specifications (TS) Change TS-505 Request for License Amendments - Extended Power Uprate (EPU) - Supplement 37, Transmission System Update - Environmental Aspects CNL-17-015, Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 36, Transmission System Update -Safety Aspects2017-01-20020 January 2017 Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 36, Transmission System Update -Safety Aspects NL-17-015, Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 36, Transmission System Update -Saf2017-01-20020 January 2017 Browns Ferry Nuclear Plant, Units 1, 2, and 3 - Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 36, Transmission System Update -Safe CNL-16-196, Revised Response to NRC Generic Letter 2016-01, Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools2016-12-19019 December 2016 Revised Response to NRC Generic Letter 2016-01, Monitoring of Neutron-Absorbing Materials in Spent Fuel Pools CNL-16-161, Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 33, Revised Response to Request for Additional..2016-10-13013 October 2016 Transmittal of Response to Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 33, Revised Response to Request for Additional.. CNL-16-145, Revised Responses to Requests for Additional Information Regarding Proposed Technical Specifications Change TS-505 - Extended Power Uprate - Supplement 302016-09-23023 September 2016 Revised Responses to Requests for Additional Information Regarding Proposed Technical Specifications Change TS-505 - Extended Power Uprate - Supplement 30 CNL-16-150, Revised Response to Requests for Additional Information Proposed Technical Specifications Change TS-505 - Request for License Amendment - Extended Power Uprate - Supplement 312016-09-21021 September 2016 Revised Response to Requests for Additional Information Proposed Technical Specifications Change TS-505 - Request for License Amendment - Extended Power Uprate - Supplement 31 CNL-16-133, Response to NRC Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (BFN-TS-486) (CAC Nos. MF6738, MF6739, and MF6740) - Letter 72016-09-15015 September 2016 Response to NRC Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (BFN-TS-486) (CAC Nos. MF6738, MF6739, and MF6740) - Letter 7 CNL-16-152, Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 32, Revised Responses to Requests for Additional Information2016-09-12012 September 2016 Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Uprate (EPU) - Supplement 32, Revised Responses to Requests for Additional Information CNL-16-126, Response to NRC Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (BFN-TS-486)2016-08-24024 August 2016 Response to NRC Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (BFN-TS-486) CNL-16-129, Response to Request for Additional Information Regarding Proposed Technical Specifications (TS) Change TS-505 License Amendments - Extended Power Uprate (EPU) - Supplement 292016-08-0303 August 2016 Response to Request for Additional Information Regarding Proposed Technical Specifications (TS) Change TS-505 License Amendments - Extended Power Uprate (EPU) - Supplement 29 CNL-16-127, Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Upgrade (EPU) - Supplement 28, Responses to Requests for Additional Information2016-08-0303 August 2016 Proposed Technical Specifications (TS) Change TS-505 - Request for License Amendments - Extended Power Upgrade (EPU) - Supplement 28, Responses to Requests for Additional Information CNL-16-114, Responses to Requests for Additional Information and Containment Accident Pressure Credit Elimination Updates on Proposed Technical Specifications Change TS-505 - Request for License Amendments - Extended Power Uprate .2016-08-0303 August 2016 Responses to Requests for Additional Information and Containment Accident Pressure Credit Elimination Updates on Proposed Technical Specifications Change TS-505 - Request for License Amendments - Extended Power Uprate . 2024-01-11
[Table view] |
Text
1101 Market Street, Chattanooga, Tennessee 37402 CNL-16-066 April 15, 2016 10 CFR 50.90 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Units 1, 2, and 3 Renewed Facility Operating License Nos. DPR-33, DPR-52, and DPR-68 NRC Docket Nos. 50-259, 50-260, and 50-296
Subject:
Response to NRC Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (BFN-TS-486) (CAC Nos. MF6738, MF6739, and MF6740) - Letter 1
References:
- 1. Letter from TVA to NRC, CNL-15-073, "Application to Modify the Browns Ferry Nuclear Plant, Units 1, and 2 Technical Specifications by Adding New Specification TS 3.3.8.3, Emergency Core Cooling System Preferred Pump Logic, Common Accident Signal (CAS) Logic, and Unit Priority Re-Trip Logic, and Unit 3 TS by adding New Specification TS 3.3.8.3, Common Accident Signal (CAS) Logic, and Unit Priority Re-Trip Logic,' (BFN-TS-486)," dated September 16, 2015 (ML15260B125)
- 2. Letter from NRC to TVA, "Browns Ferry Nuclear Plant, Units 1, 2, and 3 -
Request for Additional Information Related to License Amendment Request for Adding New Specifications to Technical Specification 3.3.8.3 (CAC Nos. MF6738, MF6739, and MF6740)," dated March 21, 2016 (ML16074A126)
By letter dated September 16, 2015 (Reference 1), Tennessee Valley Authority (TVA) submitted a license amendment request (LAR) for Browns Ferry Nuclear Plant (BFN),
Units 1, 2, and 3, to revise the BFN, Units 1 and 2, Technical Specifications (TS) by adding a new specification governing the safety functions for the Emergency Core Cooling System (ECCS) Preferred Pump Logic, Common Accident Signal Logic, and the Unit Priority Re-Trip Logic. In addition, the LAR relocated the BFN, Unit 3 requirements for Common Accident Signal Logic and Unit Priority Re-trip Logic to a new specification governing the safety functions for the Common Accident Signal Logic, and the Unit Priority Re-Trip Logic for consistency with the changes to the BFN, Units 1 and 2 TS.
U. S. Nuclear Regulatory Commission CNL-16-066 Page 2 April 15, 2016 By letter dated March 21 , 2016 (Reference 2), the Nuclear Regulatory Commission (NRC) requested additional information to support the review of the LAR. The required dates for responding to the requests for additional information varied from April 15, 2016, to May 25, 2016. provides the first set of TVA responses to some of the requests for additional information (RAls) identified in the Reference 2 letter. As stated in the Reference 2 letter, these responses are due by April 15, 2016. As discussed with the NRR Project Manager (PM) for BFN , TVA is unable to provide some of the RAI responses by the requested due dates. Consequently, as agreed-upon with the NRR PM , Enclosure 2 provides a listing of the RAls contained in the Reference 2 letter and the revised date of the TVA response to each of the RAls.
Consistent with the standards set forth in Title 10 of the Code of Federal Regulations (10 CFR) , Part 50.92(c), TVA has determined that the additional information , as provided in this letter, does not affect the no significant hazards consideration associated with the proposed application previously provided in Reference 1.
There are no new regulatory commitments associated with this submittal. Please address any questions regarding this request to Edward D. Schrull at (423) 751-3850.
I declare under penalty of perjury that the foregoing is true and correct. Executed on this 15th day o pril 2015.
e President, Nuclear Licensing
Enclosures:
- 1. TVA Responses to NRC Request for Additional Information: Set 1
- 2. Summary of BFN Request for Additional Information Response Dates Enclosure cc (Enclosure):
NRC Regional Administrator - Region II NRC Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant State Health Officer, Alabama Department of Public Health
ENCLOSURE 1 TENNESSEE VALLEY AUTHORITY BROWNS FERRY NUCLEAR PLANT UNITS 1, 2, AND 3 TVA Responses to NRC Request for Additional Information: Set 1 Probabilistic Risk Assessment (PRA) Licensing Branch (APLA) RAI 1 The LAR does not appear to clearly indicate the proposed risk-informed TS changes.
Please summarize which TS Limiting Conditions of Operation (LCOs) and Conditions or Surveillance Requirements, are being proposed as risk-informed TS changes and have been evaluated using PRA for this LAR.
TVA Response The Completion Time of proposed Browns Ferry Nuclear Plant (BFN), Units 1 and 2 Technical Specification (TS) 3.3.8.3, Condition A for one or more inoperable divisions of Emergency Core Cooling System (ECCS) Preferred Pump Logic (PPL) is the only change being proposed as a risk-informed change. The following information is provided to clarify the proposed changes contained in Enclosure, Section 4.3 Technical Analysis of the TVA License Amendment Request (LAR) dated September 16, 2015.
Browns Ferry Nuclear Plant, Units 1 and 2 ECCS PPL The ECCS PPL receives input signals from TS Table 3.3.5.1-1, Core Spray (CS)
Functions 1a, 1b, and 1c and Low Pressure Coolant Injection (LPCI) Functions 2a, 2b, and 2c.
In the event one or more required channels specified in TS Table 3.3.5.1-1 is found to be inoperable, current TS 3.3.5.1, Condition A requires immediately entering the Condition referenced in Table 3.3.5.1-1 for the affected channel(s). The two Conditions specified by TS Table 3.3.5.1-1 associated with CS Functions 1a, 1b, and 1c and LPCI Functions 2a, 2b, and 2c are Conditions B and C.
TS Table 3.3.5.1-1 references Condition B for CS Functions 1.a and 1.b, and LPCI Functions 2.a and 2.b during operation in Modes 1, 2, and 3, and CS Functions 1.a and 1.c and LPCI Functions 2.a and 2.c during operation in Modes 4 and 5 when the associated subsystem(s) are required to be operable. TS Table 3.3.5.1-1 references Condition C for CS Function 1.c and LPCI Function 2.c during operation in Modes 1, 2, and 3.
TS 3.3.5.1, Condition B requires placing the channel in trip within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in Modes 4 and 5, when the associated subsystem(s) are required to be operable. In addition, TS 3.3.5.1, Condition B requires declaring the supported ECCS feature(s) inoperable when the redundant feature ECCS initiation capability is inoperable within one hour from discovery of loss of initiation capability for features in both divisions.
CNL-16-066 Enclosure 1, Page 1 of 6
TS 3.3.5.1, Condition C requires restoring the channel to operable status within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. In addition, TS 3.3.5.1, Condition C requires declaring the supported ECCS feature(s) inoperable when the redundant feature ECCS initiation capability is inoperable within one hour from discovery of loss of initiation capability for features in both divisions.
In the event the Required Action and associated Completion Time of TS 3.3.5.1, Conditions B and C are not met, TS 3.3.5.1, Condition H requires immediately declaring the associated support ECCS feature(s) inoperable. Therefore, Required Action of TS 3.3.5.1, Condition H requires entry into the appropriate Conditions of TS 3.5.1, during operation in Modes 1, 2, and 3, or TS 3.5.2, during operation in Modes 4 and 5.
With one low pressure ECCS injection/spray subsystem inoperable during operation in Modes 1, 2, and 3, TS 3.5.1, Condition A requires restoring the affected ECCS injection/spray subsystem to operable status within seven days. With two or more low pressure ECCS injection/spray subsystem inoperable during operation in Modes 1, 2, and 3, TS 3.5.1, Condition H requires immediate entry into Limiting Condition for Operation (LCO) 3.0.3.
With one required low pressure ECCS injection/spray subsystem inoperable during operation in Modes 4 and 5, except with the spent fuel storage pool gates removed and water level 22 feet over the top of the reactor pressure vessel flange, TS 3.5.2, Condition A requires restoring the required ECCS injection/spray subsystem to operable status within four hours.
With two required ECCS injection/spray subsystems inoperable during operation in Modes 4 and 5, except with the spent fuel storage pool gates removed and water level 22 feet over the top of the reactor pressure vessel flange, TS 3.5.2, Condition C requires that action be initiated immediately to suspend operations that could result in draining the reactor vessel and restoring one ECCS injection/spray subsystem to operable status within four hours.
The proposed TS 3.3.8.3, Condition A allows one or more required ECCS PPL divisions to be inoperable for seven days before restoration to operable status. This is a less restrictive requirement than currently specified by TS 3.3.5.3, Conditions B and C. Therefore, the proposed TS 3.3.8.3, Condition A Completion Time is considered risk-informed.
During operation in Modes 1, 2, and 3, proposed TS 3.3.8.3, Condition D requires placing the unit in Mode 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and in Mode 4 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />, if the Required Action and associated Completion Time of TS 3.3.8.3, Condition A are not met. This is a more restrictive requirement than currently required by TS 3.3.5.3, Condition H. Therefore this change is not risk-informed.
During operation in Modes 4 and 5 with the opposite unit in Modes 1, 2, or 3, proposed TS 3.3.8.3, Condition E requires immediately declaring the associated ECCS components inoperable, if the Required Action and associated Completion Time of TS 3.3.8.3, Condition A are not met. TVA letter dated September 16, 2015, Enclosure, Section 4.3 provides the justification for why the requirement for the opposite unit to be in Modes 1, 2, or 3 is added to the Condition. This change is not risk-informed.
CNL-16-066 Enclosure 1, Page 2 of 6
The proposed SR 3.3.8.3.1 is consistent with the existing Logic System Functional Test required currently specified by SR 3.3.5.1.6. The six-hour allowance in the proposed SR 3.3.8.3.1, Note 1 is also consistent with the current Note 2 allowance of the TS 3.3.5.1 Surveillance Requirements table. The allowance to not require actuation of breakers in the opposite unit provided in the proposed SR 3.3.8.3.1, Note 2 is necessary to preclude unnecessary challenges to an operating unit.
Actuation of the associated breakers on the opposite unit will be performed by the opposite unit's Logic System Functional Test. Therefore, the changes incorporating SR 3.3.8.3.1, the six-hour allowance, and the allowance to not require actuation of breakers in the opposite unit are not risk-informed changes.
BFN Units 1, 2, and 3 Common Accident Signal (CAS) and Unit Priority Re-Trip Logics The proposed changes relocating the requirements for CAS from the current Units 1, 2, and 3, TS 3.8.1 to the proposed Units 1, 2, and 3, TS 3.3.8.3 are administrative in that no technical changes are made to the LCO, Mode of Applicability, Conditions, Required Actions and Completion Times. Therefore, the relocation of the CAS requirements is not a risk-informed change.
The proposed changes providing explicit requirements for the Unit Priority Re-Trip Logic are not risk informed. The proposed changes are administrative in that the Unit Priority Re-Trip Logic is currently described in the TS 3.8.1 Bases Background discussion in the discussion of the CAS Signal Logic. The proposed change proposes the same Conditions, Required Actions, and Completion Times for the Unit Priority Re-Trip Logic as those currently specified in TS 3.8.1 for the CAS Logic.
The proposed SR 3.3.8.3.1 is consistent with the existing Logic System Functional Test required currently specified by SR 3.3.5.1.6. The six-hour allowance in the proposed SR 3.3.8.3.1 is also consistent with the current Note 2 allowance of the TS 3.3.5.1 Surveillance Requirements table. Therefore, the change incorporating SR 3.3.8.3.1 and the six-hour allowance is not a risk-informed change.
In summary, the only change that is considered to be risk-informed is the Completion Time of proposed BFN, Units 1 and 2 Technical Specification (TS) 3.3.8.3, Condition A for one or more inoperable divisions of ECCS PPL. This proposed Completion Time has been evaluated using PRA for this LAR.
APLA RAI 2 Explain the equipment impact of the PPL unavailabilities allowed by the proposed TS change and how it is modeled in the internal events PRA. Include an explanation of same unit and opposite unit equipment impacts. Indicate whether the PRA evaluates single and multiple unit risk for the PPL unavailabilities and is included in the PRA results.
TVA Response A single event is used to model unavailability of PPL and this basic event is used for both BFN Units 1 and 2. The ECCS PPL unavailability basic event is included under the PPL logic for Low Pressure Injection (LPI), i.e., Unit 1 Residual Heat Removal (RHR) pumps 1A and 1C, and Unit 1 CS pumps 1A and 1C, or Unit 2 RHR pumps 1B and 1D, and Unit 2 CS pumps 2B and 2D. Similarly, a single event is used for ECCS PPL failure on demand (i.e.,
the conservative approach taken did not include divisional ECCS PPL relays, or unavailability events). In addition, a spurious ECCS PPL event is included in the model.
The logic is set up such that the pumps assigned divisionally for ECCS PPL (i.e., Unit 1 CNL-16-066 Enclosure 1, Page 3 of 6
RHR pumps 1A and 1C and Unit 1 CS pumps 1A and 1C, or Unit 2 RHR pumps 2B and 2D and Unit 2 CS pumps 2B and 2D) are assumed to be failed if ECCS PPL is unavailable and simultaneous loss of coolant accident (LOCA) signals occur in both units. The remaining RHR or CS pumps in a unit (not ECCS PPL) are assumed to fail if simultaneous signals occur. The logic is applicable in fast acting scenarios (e.g., Large LOCA, Medium LOCA, Small LOCA without high pressure injection (HPI), Break Outside Containment). The PRA Model does not include "bus separation" given ECCS PPL failure. However, in the remaining scenarios, the board and loads can be realigned because core damage would take over 36 minutes (i.e., without any injection), or many hours if steam driven HPI systems are available. The impact of single and multiple unit initiators is evaluated for Unit 1 and Unit 2. The following table lists the pumps of interest in the PRA ECCS PPL logic, and impact of ECCS PPL logic on Unit 1 and Unit 2.
Shutdown Board Pump (SDBD) Unit 1 Unit 2 Notes RHR 1A 4kV SDBD A PPL RHR 1C 4kV SDBD B PPL RHR 1B 4kV SDBD C Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur RHR 1D 4kV SDBD D Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur CS 1A 4kV SDBD A PPL CS 1C 4kV SDBD B PPL CS 1B 4kV SDBD C Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur CS 1D 4kV SDBD D Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur RHR 2A 4kV SDBD A Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur RHR 2C 4kV SDBD B Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur RHR 2B 4kV SDBD C PPL RHR 2D 4kV SDBD D PPL CS 2A 4kV SDBD A Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur CS 2C 4kV SDBD B Not PPL PRA assumes failure of this pump if simultaneous LOCA signals occur CS 2B 4kV SDBD C PPL CS 2D 4kV SDBD D PPL APLA RAI 3 Explain whether PPL unavailabilities could result in no low pressure injection (as well as no high pressure injection) following a LOCA (to include feedwater and steamline break). If so, explain the plants defense-in-depth for the LOCA scenario.
TVA Response HPI systems are not affected by ECCS PPL, but may not be available if the reactor pressure vessel depressurizes quickly because the HPI systems use steam driven pumps. Initiator impact is modeled under the HPI system logic that would automatically fail HPI. The PRA ECCS PPL logic model is included under RHR or CS logic as described in the TVA response to APLA-RAI-2. ECCS PPL unavailability could result in failure of Low Pressure Injection (CS and RHR) during a fast acting LOCA scenario if a coincident spurious or actual accident signal occurs in the other unit. For instance, if ECCS PPL is unavailable and a CNL-16-066 Enclosure 1, Page 4 of 6
LOCA occurs in a unit combined with a simultaneous LOCA signal (real or spurious) in the opposite unit, then the PRA models assume all RHR and CS pumps are not available to mitigate core damage in these fast acting scenarios. These scenarios are assumed to result in core damage because no additional systems are credited (e.g., sequence LLOCA-005).
APLA RAI 8 Prior to the proposed TS change, there was no explicit LCO for UPRTL [Unit Priority Re-Trip Logic]. The LAR states that the LCO for UPRTL is implicitly required by the TS 3.8.1 Condition D, which applied to the CAS. In the proposed TS change for Unit 1 and Unit 2, LCO 3.3.8.3, Condition B applies to CAS and LCO 3.3.8.3, Condition C applies to UPRTL.
For Unit 3, LCO 3.3.8.3, Condition A applies to CAS and LCO 3.3.8.3, Condition B applies to UPRTL. These TS LCO Conditions for the UPRTL have a 7 day completion time and are new proposed changes. If these UPRTL TS LCOs are proposed as risk-informed changes, then include the associated risk for Units 1, 2, and 3 in the results reported in the LAR as part of APLA-RAI-14.
TVA Response The proposed changes providing explicit requirements for the Unit Priority Re-Trip Logic are not risk informed. The proposed changes are considered administrative in that the Unit Priority Re-Trip Logic is currently described in the TS 3.8.1 Bases Background discussion in the discussion of the CAS Signal Logic. The proposed change proposes the same Conditions, Required Actions, and Completion Times for the Unit Priority Re-Trip Logic as those currently specified in TS 3.8.1 for the CAS Logic.
APLA RAI 9 Note 1 to the proposed SR 3.3.8.3.1 states that, "when a division is placed in an inoperable status solely for performance of a surveillance, entry into associated Conditions and Required Actions may be delayed for up to six hours provided the associated redundant division is OPERABLE." The proposed TS Bases state that the "PRA demonstrated that the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> testing allowance does not significantly reduce the probability that the ECCS Preferred Pump, CAS and Unit Priority Re-trip Logics will initiate when necessary." If the LAR is justifying the 6 hour6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> testing allowance time as a risk-informed TS change, then provide the PRA justification for the 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> testing allowance for the ECCS PPL, CAS, and UPRTL. Provide the LAR risk results impact as part of APLA-RAI-14.
TVA Response The six-hour allowance in the proposed SR 3.3.8.3.1 is not a risk-informed change. As stated in the current TS 3.3.5.1 Bases, the allowance is based on the reliability analysis (i.e.,
NEDC-30936-P-A, "BWR Owners' Group Technical Specification Improvement Analyses for ECCS Actuation Instrumentation, Part 2," December 1988) assumption of the average time required to perform channel surveillance. That analysis demonstrated that the six-hour testing allowance does not significantly reduce the probability that the ECCS will initiate when necessary. The six-hour allowance was incorporated into the PRA when the ECCS PPL was first modeled. However, the six-hour allowance is not changed by the License Amendment Request. The Logic System Functional Test for ECCS PPL, CAS Logic and Unit Priority Re-Trip Logic is currently required by TS 3.3.5.1, SR 3.3.5.1.6. The current Surveillance Requirements Table of TS 3.3.5.1 is modified by Note 2, which states, "When a channel is placed in an inoperable status solely for performance of required Surveillances, entry into associated Conditions and Required Actions may be delayed as follows: (a) for up to six hours for Functions 3.c and 3.f; and (b) for up to six hours for CNL-16-066 Enclosure 1, Page 5 of 6
Functions other than 3.c and 3.f provided the associated Function or the redundant Function maintains ECCS initiation capability." ECCS PPL receives input signals from TS Table 3.3.5.1-1, CS Functions 1a, 1b, and 1c and LPCI Functions 2a, 2b, and 2c. CAS Logic receives input from TS Table 3.3.5.1-1, CS Functions 1a, 1b, and 1c. Unit Priority Re-Trip Logic receives input from TS Table 3.3.5.1-1, LPCI Functions 2a, 2b, and 2c. Therefore, the six-hour allowance currently applies to the ECCS PPL, CAS Logic and Unit Priority Re-Trip Logic and is not a change from the current requirements.
CNL-16-066 Enclosure 1, Page 6 of 6
ENCLOSURE 2 Tennessee Valley Authority Browns Ferry Nuclear Plant, Units 1, 2, and 3 Summary of BFN Request for Additional Information Response Dates CNL-16-066 Enclosure 2, Page 1 of 3
Request for Due Date Additional Revised Due (NRC Letter dated Actual Date of Response Information (RAI) Dates March 21, 2016)
Question Number Electrical Engineering Branch (EEEB)
EEEB RAI 1 April 15, 2016 May 11, 2016 Future Letter EEEB RAI 2 April 15, 2016 May 11, 2016 Future Letter EEEB RAI 3 April 15, 2016 May 11, 2016 Future Letter EEEB RAI 4 April 15, 2016 May 11, 2016 Future Letter Instrumentation and Controls Branch (EICB)
EICB RAI 1 April 15, 2016 May 11, 2016 Future Letter EICB RAI 2 April 15, 2016 May 11, 2016 Future Letter EICB RAI 3 April 15, 2016 June 16, 2016 Future Letter Probabilistic Risk Assessment Branch (PRA) Licensing Branch (APLA)
APLA-RAI-1 April 15, 2016 No change CNL-16-066, April 15, 2016 APLA-RAI-2 April 15, 2016 No change CNL-16-066, April 15, 2016 APLA-RAI-3 April 15, 2016 No change CNL-16-066, April 15, 2016 APLA-RAI-4 May 25, 2016 May 11, 2016 Future Letter APLA-RAI-5 May 25, 2016 June 16, 2016 Future Letter APLA-RAI-6i April 15, 2016 May 11, 2016 Future Letter APLA-RAI-6ii April 15, 2016 May 11, 2016 Future Letter APLA-RAI-6iii April 15, 2016 May 11, 2016 Future Letter APLA-RAI-6iv May 25, 2016 June 16, 2016 Future Letter APLA-RAI-7 April 15, 2016 May 11, 2016 Future Letter APLA-RAI-8 April 15, 2016 No change CNL-16-066, April 15, 2016 CNL-16-066 Enclosure 2, Page 2 of 3
Request for Due Date Additional Revised Due (NRC Letter dated Actual Date of Response Information (RAI) Dates March 21, 2016)
Question Number APLA-RAI-9 April 15, 2016 No change CNL-16-066, April 15, 2016 APLA-RAI-10 April 29, 2016 No change Future Letter APLA-RAI-11 April 29, 2016 No change Future Letter APLA-RAI-12 May 25, 2016 No change Future Letter APLA-RAI-13a May 25, 2016 June 16, 2016 Future Letter APLA-RAI-13b May 25, 2016 No change Future Letter APLA-RAI-13b May 25, 2016 No change Future Letter APLA-RAI-14 May 25, 2016 June 16, 2016 Future Letter APLA-RAI-15 May 25, 2016 No change Future Letter APLA-RAI-16 April 29, 2016 No change Future Letter Summary April 15, 2016: APLA RAI 1, 2, 3, 8, 9 April 29, 2016: APLA RAI 10, 11, 16 May 11, 2016: APLA RAI 4, 6i, 6ii, 6iii, 7; EEEB RAI 1, 2, 3, 4; EICB RAI 1, 2 May 25, 2016: APLA RAI 12, 13b, 13c, 15 June 16, 2016: APLA RAI 5, 6iv,13a, 14; EICB RAI 3 CNL-16-066 Enclosure 2, Page 3 of 3