|
|---|
Category:Letter type:RS
MONTHYEARRS-24-004, Proposed Alternative to the Distribution Requirements of ASME Code Table IWC-2411-1 for the Steam Generators2024-01-11011 January 2024
Proposed Alternative to the Distribution Requirements of ASME Code Table IWC-2411-1 for the Steam Generators
RS-23-118, Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information2023-11-10010 November 2023
Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information
RS-23-117, Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information2023-11-10010 November 2023
Supplemental Information Letter for Part 73 Exemption Request - Responses to Request for Confirmatory Information
RS-23-114, Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds2023-11-0101 November 2023
Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds
RS-23-100, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-10-13013 October 2023
Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation
RS-23-097, Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans2023-10-12012 October 2023
Constellation Energy Generation, LLC, Advisement of Leadership Changes and Submittal of Updated Standard Practice Procedures Plans
RS-23-108, Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles2023-10-11011 October 2023
Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator Pressure Retaining Welds and Full Penetration Welded Nozzles
RS-23-105, Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections2023-10-10010 October 2023
Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds and Nozzle Inside Radius Sections
RS-23-093, License Amendment to Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, Technical Specifications 3.7.15, Spent Fuel Pool Boron Concentration, 3.7.16, Spent Fuel.2023-09-29029 September 2023
License Amendment to Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2, Technical Specifications 3.7.15, Spent Fuel Pool Boron Concentration, 3.7.16, Spent Fuel.
RS-23-094, Relief Request I4R-24, Alternative for Post-Peening Reexamination Frequency for Reactor Pressure Vessel Head Penetration Nozzle Number 752023-09-29029 September 2023
Relief Request I4R-24, Alternative for Post-Peening Reexamination Frequency for Reactor Pressure Vessel Head Penetration Nozzle Number 75
RS-23-091, Relief Request I4R-25, Alternative Requirements for Reactor Pressure Vessel Inservice Inspection Intervals2023-09-26026 September 2023
Relief Request I4R-25, Alternative Requirements for Reactor Pressure Vessel Inservice Inspection Intervals
RS-23-083, Withdrawal - Proposed Alternatives Related to the Steam Generators2023-06-27027 June 2023
Withdrawal - Proposed Alternatives Related to the Steam Generators
RS-23-077, Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations2023-06-16016 June 2023
Response to NRC Regulatory Issue Summary 2023-01, Preparation and Scheduling of Operator Licensing Examinations
RS-23-074, Supplement to Application for License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink2023-06-0909 June 2023
Supplement to Application for License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink
RS-23-075, Application for Technical Specification Improvement to Extend the Completion Time for Condition B of Technical Specification 3.5.1, Accumulators, Using the Consolidated Line Item Improvement Process2023-06-0707 June 2023
Application for Technical Specification Improvement to Extend the Completion Time for Condition B of Technical Specification 3.5.1, Accumulators, Using the Consolidated Line Item Improvement Process
RS-23-050, Supplement to Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam Generator Tube.2023-05-22022 May 2023
Supplement to Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam Generator Tube.
RS-23-056, Response to Request for Additional Information to Braidwood Station, Unit 1, and Byron Station, Unit 1, for Steam Generator License Renewal Response to Commitment 102023-04-20020 April 2023
Response to Request for Additional Information to Braidwood Station, Unit 1, and Byron Station, Unit 1, for Steam Generator License Renewal Response to Commitment 10
RS-23-055, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors2023-04-10010 April 2023
Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors
RS-23-052, License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink2023-03-24024 March 2023
License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink
RS-23-049, Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations2023-03-23023 March 2023
Constellation Energy Generation, LLC, Report on Status of Decommissioning Funding for Reactors and Independent Spent Fuel Storage Installations
RS-23-045, Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.2032023-02-28028 February 2023
Constellation Energy Generation, LLC Submittal of Fitness for Duty Performance Data Reports for 2022 Per 10 CFR 26.717(c) & 10 CFR 26.203
RS-23-038, Response to Request for Additional Information for the Byron Proposal to Reinsert an Accident Tolerant Fuel Lead Test Assembly2023-02-27027 February 2023
Response to Request for Additional Information for the Byron Proposal to Reinsert an Accident Tolerant Fuel Lead Test Assembly
RS-23-040, Constellation Energy Generation, LLC, Supplemental Information - Proposed Alternatives Related to the Steam Generators2023-02-21021 February 2023
Constellation Energy Generation, LLC, Supplemental Information - Proposed Alternatives Related to the Steam Generators
RS-23-003, Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-102023-01-31031 January 2023
Constellation Energy Generation, LLC, Summary of Changes to Quality Assurance Topical Report, NO-AA-10, and Decommissioning Quality Assurance Program, NO-DC-10
RS-22-123, Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam Generator2022-12-0707 December 2022
Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam Generator
RS-22-126, Constellation Energy Generation, LLC - Request to Use Provisions of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI2022-11-30030 November 2022
Constellation Energy Generation, LLC - Request to Use Provisions of a Later Edition of the ASME Boiler and Pressure Vessel Code, Section XI
RS-22-118, Withdrawal of License Amendment Request to Revise Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink2022-10-31031 October 2022
Withdrawal of License Amendment Request to Revise Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink
RS-22-110, Supplemental Information - Proposed Alternatives Related to the Steam Generators and Request.2022-09-20020 September 2022
Supplemental Information - Proposed Alternatives Related to the Steam Generators and Request.
RS-22-097, License Amendment Request to Reinsert an Accident Tolerant Fuel Lead Test Assembly2022-08-31031 August 2022
License Amendment Request to Reinsert an Accident Tolerant Fuel Lead Test Assembly
RS-22-093, Advisement of Leadership Changes for Constellation Energy Generation, LLC and Submittal of Updated Standard Practice Procedures Plans2022-08-18018 August 2022
Advisement of Leadership Changes for Constellation Energy Generation, LLC and Submittal of Updated Standard Practice Procedures Plans
RS-22-086, R. E. Ginna Nuclear Power Plant - Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam.2022-08-10010 August 2022
R. E. Ginna Nuclear Power Plant - Application to Revise Technical Specifications to Adopt TSTF-577, Revised Frequencies for Steam.
RS-22-084, Response to Request for Additional Information Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator .2022-06-17017 June 2022
Response to Request for Additional Information Proposed Alternative for Examinations of Examination Categories B-B, B-D, and C-A Steam Generator .
RS-22-072, Response to Request for Additional Information Regarding License Amendment to Revise Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink2022-06-0606 June 2022
Response to Request for Additional Information Regarding License Amendment to Revise Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink
RS-22-075, License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink2022-06-0202 June 2022
License Amendment to Braidwood Station, Units 1 and 2, Technical Specification 3.7.9, Ultimate Heat Sink
RS-22-074, Response to Request for Additional Information - Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds .2022-05-20020 May 2022
Response to Request for Additional Information - Proposed Alternative for Examinations of Examination Category C-B Steam Generator Nozzle-to-Shell Welds .
RS-22-073, Supplemental Information Regarding License Amendment Request -Adoption of Technical Specification Task Force (TSTF) Traveler TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube.2022-05-19019 May 2022
Supplemental Information Regarding License Amendment Request -Adoption of Technical Specification Task Force (TSTF) Traveler TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube.
RS-22-057, Constellation Radiological Emergency Plan Addendum Revision2022-04-21021 April 2022
Constellation Radiological Emergency Plan Addendum Revision
RS-22-037, License Amendment Request - Adoption of Technical Specification Task Force (TSTF) Traveler TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube Oil Volume Values to Licensee Control2022-04-21021 April 2022
License Amendment Request - Adoption of Technical Specification Task Force (TSTF) Traveler TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube Oil Volume Values to Licensee Control
RS-22-051, Constellation Energy Generation, LLC - Update to Correspondence Addressees and Service Lists2022-04-12012 April 2022
Constellation Energy Generation, LLC - Update to Correspondence Addressees and Service Lists
RS-22-047, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors2022-04-0808 April 2022
Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors
RS-22-050, Supplemental Information - Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds2022-04-0808 April 2022
Supplemental Information - Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds
RS-22-049, Constellation Energy Generation, LLC, Supplemental Information to Correct Typographical Errors in Constellation'S Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for2022-04-0404 April 2022
Constellation Energy Generation, LLC, Supplemental Information to Correct Typographical Errors in Constellation'S Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for V
RS-22-045, Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2022-01, Preparation and Scheduling of Operator Licensing Examinations2022-03-25025 March 2022
Constellation Energy Generation, LLC, Response to NRC Regulatory Issue Summary 2022-01, Preparation and Scheduling of Operator Licensing Examinations
RS-22-014, Application to Adopt TSTF-246, RTS Instrumentation, 3.3.1 Condition F Completion Time2022-03-24024 March 2022
Application to Adopt TSTF-246, RTS Instrumentation, 3.3.1 Condition F Completion Time
RS-22-041, Withdrawal of License Amendment Request to Revise Technical Specifications 5.6.5, Core Operating Limits Report (COLR) to Add References to NRC Approved Topical Report with Administrative Changes2022-03-22022 March 2022
Withdrawal of License Amendment Request to Revise Technical Specifications 5.6.5, Core Operating Limits Report (COLR) to Add References to NRC Approved Topical Report with Administrative Changes
RS-22-036, Supplemental Information - Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds2022-03-10010 March 2022
Supplemental Information - Proposed Alternative for Examination of Pressurizer Circumferential and Longitudinal Shell-to-Head Welds and Nozzle-to-Vessel Welds
RS-22-023, Constellation Energy Generation, LLC, Executed Trust Fund Agreement Amendment and Subordinate Trust Agreement2022-02-23023 February 2022
Constellation Energy Generation, LLC, Executed Trust Fund Agreement Amendment and Subordinate Trust Agreement
RS-22-027, Constellation, Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated2022-02-23023 February 2022
Constellation, Response to Request for Additional Information Regarding Application to Revise Technical Specifications to Adopt TSTF-541 Revision 2, Add Exceptions to Surveillance Requirements for Valves and Dampers Locked in the Actuated P
RS-22-019, Constellation Energy Generation, LLC - Update to Correspondence Addressees and Service Lists2022-02-16016 February 2022
Constellation Energy Generation, LLC - Update to Correspondence Addressees and Service Lists
RS-22-015, Notification of Completion of License Transfer and Request to Continue Processing Pending NRC Actions Previously Requested by Exelon Generation Company, LLC2022-02-0101 February 2022
Notification of Completion of License Transfer and Request to Continue Processing Pending NRC Actions Previously Requested by Exelon Generation Company, LLC
2024-01-11
[Table view] |
Text
Michael P. Gallagher Vice President. License Renewal Exelon Generation Exelon Nuclear 200 Exelon Way Kennett Square. PA 19348 610 765 5958 Office 610 765 5956 Fax www.exeloncorp.com michaelp.gallagher@exeloncorp.com 10 CFR 50 10 CFR 51 10 CFR 54 RS-14-091 March 21, 2014 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and STN 50-457 Byron Station, Units 1 and 2 Facility Operating License Nos. NPF-37 and NPF-66 NRC Docket Nos. STN 50-454 and STN 50-455
Subject:
Updated Responses to NRC Requests for Additional Information, Set 3, dated November 25, 2013, related to the Braidwood Station, Units 1 and 2 and Byron Station, Units 1 and 2 License Renewal Application
References:
- 1. Letter from Michael P. Gallagher, Exelon Generation Company LLC (Exelon) to NRC Document Control Desk, dated May 29, 2013, "Application for Renewed Operating Licenses."
- 2. Letter from Michael P. Gallagher, Exelon Generation Company LLC (Exelon) to NRC Document Control Desk, dated December 17, 2013, "Response to NRC Requests for Additional Information, Set 3, dated November 25, 2013, related to the Braidwood Station, Units 1 and 2 and Byron Station, Units 1 and 2 License Renewal Application In the Reference 1 letter, Exelon Generation Company, LLC (Exelon) submitted the License Renewal Application (LRA) for the Braidwood Station, Units 1 and 2, and Byron Station, Units 1 and 2 (BBS). In Reference 2, Exelon provided responses to NRC Set 3 Requests for Additional Information.
After review of these responses, the NRC staff indicated that additional detail related to the responses to two of the Set 3 RAis, RAI 2.1.3.4-1 and RAI 2.1.3.4-3, is required. This letter provides updated responses to each of these two RAis. These updated responses replace the original responses in their entirety.
March 21, 2014 U.S. Nuclear Regulatory Commission Page 2 Responses to the other four RAis that were part of Set 3 are not affected by this update; therefore, they are not included in this package.
Enclosure A contains the updated responses to RAI 2.1.3.4-1 and RAI 2.1.3.4-3.
Enclosure B contains an update to LRA Section 2, consistent with the updated RAI responses.
There are no new or revised regulatory commitments contained in this letter.
If you have any questions, please contact Mr. AI Fulvia, Manager, Exelon License Renewal, at 610-765-5936.
I declare under penalty of perjury that the foregoing is true and correct.
Respectfully, Michael P. Gallagher <'
Vice President - License Renewal Projects Exelon Generation Company, LLC
Enclosures:
A: Updated Responses to Requests for Additional Information B: Updates to LRA Section 2 cc: Regional Administrator- NRC Region Ill NRC Project Manager (Safety Review), NRR-DLR NRC Project Manager (Environmental Review), NRR-DLR NRC Senior Resident Inspector, Braidwood Station NRC Senior Resident Inspector, Byron Station NRC Project Manager, NRR-DORL-Braidwood and Byron Stations Illinois Emergency Management Agency- Division of Nuclear Safety
RS-14-091 Enclosure A Page 1 of 5 Enclosure A Byron and Braidwood Stations (BBS), Units 1 and 2 License Renewal Application Updated Responses to Requests for Additional Information RAI 2.1.3.4-1 RAI 2.1.3.4-3 Note: To facilitate understanding, the original RAI responses are shown in normal font.
Changes resulting from this submittal are highlighted with bolded italics for inserted text.
RS-14-091 Enclosure A Page 2 of 5 RAI 2.1.3.4-1, SATs and SBO recovery boundary - Byron Applicability: Byron
Background:
On Page 8.3-5 of the Byron-Braidwood Stations (BBS) Updated Final Safety Analysis Report (UFSAR), Section 8.3.1.1.2.1, the licensee provided the preferred configuration for both stations Unit 1 and Unit 2 under normal operating conditions in the following statements: The 4160-volt ESF bus 141 (241 [for Unit 2]) fed from the 345-kV utility grid through system auxiliary transformer (SAT) 142-1 (242-1) and circuit breaker 1412 (2412) and The 4160-volt ESF bus 142 (242) fed from the 345-kV utility grid through SAT 142-2 (242-2) and circuit breaker 1422 (2422)... The staff notes that these statements indicate that there are SATs and circuit breakers between the 345-kilo-volts (kV) utility grid and the 4160-volt ESF buses.
Issue:
Figure 2.1-2 in the LRA, Section 2.1.3.4, which depicts the Byron Station Blackout (SBO) recovery boundary, does not show circuit breakers 1412, 1422, 2412, and 2422 between the 345-kV circuit breakers and the 4160-volt ESF buses.
Request:
- a. Clarify why circuit breakers 1412, 1422, 2412 and 2422 are not included in Figure 2.1-2.
- b. Confirm that all components, including breakers and disconnect switches, between the 345-kV utility grid and the 4160-volt ESF buses that are in the SBO recovery path are within the scope of license renewal.
- c. Provide a revised Figure 2.1-2, as applicable, for the Byron SBO recovery boundary including all components in the SBO recovery path that shows a clear distinction between components that are within the scope of license renewal and those that are not.
Exelon Response:
- a. LRA Figure 2.1-2, Byron Station Blackout (SBO) Recovery Boundary is a simplified representation of the Byron SBO recovery path. Circuit breakers 1412, 1422, 2412, and 2422 were not shown on LRA Figure 2.1-2 and circuit breakers 1413, 1414, 1423, 1424, 2413, 2414, 2423, and 2424 were shown, but not labeled on LRA Figure 2.1-2 to maintain the figure as simple as possible. Circuit breakers 1412, 1413, 1414, 1422, 1423, 1424, 2412, 2413, 2414, 2422, 2423, and 2424 are within the scope of license renewal.
- b. The components in the SBO recovery path between the 345-kV utility grid and the 4160-volt ESF buses, including breakers and disconnect switches, are within the scope of license renewal.
RS-14-091 Enclosure A Page 3 of 5 The 4160-volt ESF bus power paths from:
the normal offsite source from the 345-kV utility grid, the reserve offsite source from the 345-kV utility grid, the alternate AC source are described below using Byron Unit 1, 4160-volt ESF bus 141 as an example.
The normal offsite source from the 345-kV system is through the Unit 1 System Auxiliary Transformer 142-1 and then through breaker 1412 to energize the 4160-volt ESF bus 141.
The reserve offsite source from the 345-kV system is through the Unit 2 System Auxiliary Transformer 242-1 and then through breakers 2412, 2414 and 1414 to energize the 4160-volt ESF bus 141.
The alternate AC source is from the Unit 2 diesel generator DG2A through breakers 2413, 2414 and 1414 to energize the 4160-volt ESF bus 141.
The power paths for remaining Byron Units 1 and 2 4160-volt ESF buses are similar.
- c. Consistent with this response, LRA Figure 2.1-2, page 2.1-14, is revised as shown in Enclosure B. The revised LRA Figure 2.1-2 for the Byron SBO recovery boundary includes circuit breakers 1412, 1422, 2412, and 2422 and labels for circuit breakers 1413, 1414, 1423, 1424, 2413, 2414, 2423, and 2424. Also, an explicit demarcation line that shows a clear distinction between components that are within the scope of license renewal and those components that are not in the scope of license renewal is added to LRA Figure 2.1-2.
RS-14-091 Enclosure A Page 4 of 5 RAI 2.1.3.4-3, SATs and SBO recovery boundary - Braidwood Applicability: Braidwood
Background:
On Page 8.3-5 of the Byron-Braidwood Stations (BBS) Updated Final Safety Analysis Report (UFSAR), Section 8.3.1.1.2.1, the licensee provided the preferred configuration for both stations Unit 1 and Unit 2 under normal operating conditions in the following statements: The 4160-volt ESF bus 141 (241 [for Unit 2]) fed from the 345-kV utility grid through system auxiliary transformer (SAT) 142-1 (242-1) and circuit breaker 1412 (2412) and The 4160-volt ESF bus 142 (242) fed from the 345-kV utility grid through SAT 142-2 (242-2) and circuit breaker 1422 (2422)... The staff notes that these statements indicate that there are SATs and circuit breakers between the 345-kilo-volts (kV) utility grid and the 4160-volt ESF buses.
Issue:
Figure 2.1-3 in the LRA, Section 2.1.3.4, which depicts the Braidwood Station Blackout (SBO) recovery boundary, does not show circuit breakers 1412, 1422, 2412, and 2422 between the 345-kV circuit breakers and the 4160-volt ESF buses.
Request:
- a. Clarify why circuit breakers 1412, 1422, 2412 and 2422 are not included in Figure 2.1-3.
- b. Confirm that all components, including breakers and disconnect switches, between the 345-kV utility grid and the 4160-volt ESF buses that are in the SBO recovery path are within the scope of license renewal.
- c. Provide a revised Figure 2.1-3, as applicable, for the Byron SBO recovery boundary including all components in the SBO recovery path that shows a clear distinction between components that are within the scope of license renewal and those that are not.
Exelon Response:
- a. LRA Figure 2.1-3, Braidwood Station Blackout (SBO) Recovery Boundary is a simplified representation of the Braidwood SBO recovery path. Circuit breakers 1412, 1422, 2412, and 2422 were not shown on LRA Figure 2.1-3 and circuit breakers 1413, 1414, 1423, 1424, 2413, 2414, 2423, and 2424 were shown, but not labeled on LRA Figure 2.1-3 to maintain the figure as simple as possible.
Circuit breakers 1412, 1413, 1414, 1422, 1423, 1424, 2412, 2413, 2414, 2422, 2423, and 2424 are within the scope of license renewal.
- b. The components in the SBO recovery path between the 345-kV utility grid and the 4160-volt ESF buses, including breakers and disconnect switches, are within the scope of license renewal.
RS-14-091 Enclosure A Page 5 of 5 The 4160-volt ESF bus power paths from:
the normal offsite source from the 345-kV utility grid, the reserve offsite source from the 345-kV utility grid, the alternate AC source are described below using Braidwood Unit 1, 4160-volt ESF bus 141 as an example.
The normal offsite source from the 345-kV system is through the Unit 1 System Auxiliary Transformer 142-1 and then through breaker 1412 to energize the 4160-volt ESF bus 141.
The reserve offsite source from the 345-kV system is through the Unit 2 System Auxiliary Transformer 242-1 and then through breakers 2412, 2414 and 1414 to energize the 4160-volt ESF bus 141.
The alternate AC source is from the Unit 2 diesel generator DG2A through breakers 2413, 2414 and 1414 to energize the 4160-volt ESF bus 141.
The power paths for remaining Braidwood Units 1 and 2 4160-volt ESF buses are similar.
- c. Consistent with this response, LRA Figure 2.1-3, page 2.1-15, is revised as shown in Enclosure B. The revised LRA Figure 2.1-3 for the Braidwood SBO recovery boundary includes circuit breakers 1412, 1422, 2412, and 2422 and labels for circuit breakers 1413, 1414, 1423, 1424, 2413, 2414, 2423, and 2424. Also, an explicit demarcation line that shows a clear distinction between components that are within the scope of license renewal and those components that are not in the scope of license renewal is added to LRA Figure 2.1-3.
RS-14-091 Enclosure B Page 1 of 3 Enclosure B Byron and Braidwood Stations, Units 1 and 2 License Renewal Application (LRA) updates resulting from the responses to the following RAIs:
RAI 2.1.3.4-1 RAI 2.1.3.4-3 Note: To facilitate understanding, the original LRA Figure 2.1-2, page 2.1-14 and Figure 2.1-3, page 2.1-15 have been repeated in this Enclosure, with revisions indicated. Original LRA text is shown in normal font. Changes originating from this letter and from Exelon letter RS-13-273, dated December 17, 2013 are highlighted with bolded italics for inserted text.
RS-14-091 Enclosure B Page 2 of 3 As a result of the updated response to RAI 2.1.3.4-1 provided in Enclosure A of this letter, and the original response to RAI 2.1.3.4-2 provided in Enclosure A of Exelon letter RS-13-273, LRA Figure 2.1-2, "Byron SBO Recovery Boundary," page 2.1-14, is revised as shown below:
Figure 2.1-2
RS-14-091 Enclosure B Page 3 of 3 As a result of the updated response to RAI 2.1.3.4-3 provided in Enclosure A of this letter, and the original response to RAI 2.1.3.4-4 provided in Enclosure A of Exelon letter RS-13-273, LRA Figure 2.1-3, page 2.1-15, "Braidwood SBO Recovery Boundary," is revised as shown below:
Figure 2.1-3
