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Category:Letter type:RS
MONTHYEARRS-23-120, 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-23-103, 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-23-080, Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - 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Update to Correspondence Addressees and Service Lists2022-04-12012 April 2022 Constellation Energy Generation, LLC - Update to Correspondence Addressees and Service Lists 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-22-035, Supplemental Information Regarding Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs2022-03-0404 March 2022 Supplemental Information Regarding Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs RS-22-033, Response to Request for Additional Information Regarding Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs2022-03-0303 March 2022 Response to Request for Additional Information Regarding Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs RS-22-032, Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs2022-03-0202 March 2022 Relief Request I4R-13 Relief from Code Examinations for 1B33-F060A and 1B33-F060B Repairs 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-22-018, Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station2022-02-22022 February 2022 Annual 10 CFR 50.46 Report of Emergency Core Cooling System Evaluation Model Changes and Errors for LaSalle County Station 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 RS-22-004, Supplement to Application to Adopt TSTF-554, Revision 1, Revise Reactor Coolant Leakage Requirements2022-01-0404 January 2022 Supplement to Application to Adopt TSTF-554, Revision 1, Revise Reactor Coolant Leakage Requirements RS-21-121, Proposed Changes to Decommissioning Trust Agreements and Master Terms2021-12-15015 December 2021 Proposed Changes to Decommissioning Trust Agreements and Master Terms RS-21-115, Supplemental Information for License Amendment Request Regarding New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies, with Proposed Changes to Technical Specifications 4.3.1 and 5.6.52021-11-0404 November 2021 Supplemental Information for License Amendment Request Regarding New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies, with Proposed Changes to Technical Specifications 4.3.1 and 5.6.5 RS-21-109, Request to Withhold Meeting Materials for the Non-Public Meeting Held on September 2, 20212021-10-14014 October 2021 Request to Withhold Meeting Materials for the Non-Public Meeting Held on September 2, 2021 RS-21-091, Implementation of Insider Threat Program Requirements Associated with the Voluntary Security Clearance Program and Advisement of Leadership Changes2021-09-13013 September 2021 Implementation of Insider Threat Program Requirements Associated with the Voluntary Security Clearance Program and Advisement of Leadership Changes RS-21-078, Response to Request for Additional Information for Application to Revise Technical Specification to Adopt TSTF-582, Reactor Pressure Vessel Water Inventory Control (RPV WIC) Enhancements, and TSTF-583-T, TSTF-582 Diesel2021-08-19019 August 2021 Response to Request for Additional Information for Application to Revise Technical Specification to Adopt TSTF-582, Reactor Pressure Vessel Water Inventory Control (RPV WIC) Enhancements, and TSTF-583-T, TSTF-582 Diesel RS-21-085, Response to Request for Additional Information Regarding License Amendment Request to Incorporate Licensing Topical Report NEDE-33885PA, Revision 1, GNF CRDA Application Methodology (EPID-L-2021-LLA-0016)2021-08-17017 August 2021 Response to Request for Additional Information Regarding License Amendment Request to Incorporate Licensing Topical Report NEDE-33885PA, Revision 1, GNF CRDA Application Methodology (EPID-L-2021-LLA-0016) RS-21-063, Application to Adopt TSTF-554, Revision 1, Revise Reactor Coolant Leakage Requirements2021-06-30030 June 2021 Application to Adopt TSTF-554, Revision 1, Revise Reactor Coolant Leakage Requirements RS-21-064, License Amendment Request Re New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies - Cover Letter2021-06-30030 June 2021 License Amendment Request Re New Fuel Storage Vault and Spent Fuel Storage Pool Criticality Methodologies - Cover Letter RS-21-070, Proposed Alternative to Utilize Code Case N-8932021-06-30030 June 2021 Proposed Alternative to Utilize Code Case N-893 RS-21-055, Response to Third Round Request for Additional Information (Rals) for LaSalle License Amendment Request to Adopt Risk Informed Completion Times TSTF- 505, Revision 2, Provide Risk-Informed Extended.2021-05-10010 May 2021 Response to Third Round Request for Additional Information (Rals) for LaSalle License Amendment Request to Adopt Risk Informed Completion Times TSTF- 505, Revision 2, Provide Risk-Informed Extended. RS-21-054, Response to NRC Regulatory Issue Summary 2021-01, Preparation and Scheduling of Operator Licensing Examinations2021-04-29029 April 2021 Response to NRC Regulatory Issue Summary 2021-01, Preparation and Scheduling of Operator Licensing Examinations RS-21-050, Response to Request for Additional Information (RAI) Regarding Request for License Amendment Regarding Ultimate Heat Sink (EPID-L-2020-LLA-0165)2021-04-16016 April 2021 Response to Request for Additional Information (RAI) Regarding Request for License Amendment Regarding Ultimate Heat Sink (EPID-L-2020-LLA-0165) RS-21-045, Response to Request for Additional Information (RAI) Regarding Request for License Amendment Regarding Ultimate Heat Sink (EPID-L-2020-LLA-0165)2021-04-0707 April 2021 Response to Request for Additional Information (RAI) Regarding Request for License Amendment Regarding Ultimate Heat Sink (EPID-L-2020-LLA-0165) RS-21-040, Response to Second Round Request for Additional Information (Rais) for License Amendment Request to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b2021-03-31031 March 2021 Response to Second Round Request for Additional Information (Rais) for License Amendment Request to Adopt Risk Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b RS-21-043, Supplemental Information Regarding Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs, Revision 22021-03-26026 March 2021 Supplemental Information Regarding Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs, Revision 2 RS-21-042, Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs, Revision 22021-03-26026 March 2021 Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs, Revision 2 RS-21-039, Supplemental Information Regarding Application for Order Approving Transfers and Proposed Conforming License Amendments2021-03-25025 March 2021 Supplemental Information Regarding Application for Order Approving Transfers and Proposed Conforming License Amendments RS-21-035, Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs2021-03-0909 March 2021 Relief Request I4R-12 Relief from Code Examinations for 2B33-F060A and 2B33-F060B Repairs 2023-08-04
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Exelon Nuclear www.exeloncorp .corn Exellon 4300 Winfield Road Nuclear Warrenville, IL 60555 RS-09-113 August 25, 2009 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Units 1 and 2 Facility Operating License Nos . NPF-11 and NPF-18 NRC Docket Nos. 50-373 and 50-374
Subject:
Response to Request for Additional Information Regarding Relief Request CR-26 References : 1 . Letter from P. R . Simpson (Exelon Generation Company, LLC) to U .S. NRC, "Relief Request CR-26, Inservice Inspection Program Relief Regarding Examination Coverage for Second 10-Year Inservice Inspection Interval,"
dated October 1, 2008
- 2. Letter from C. S. Goodwin (U.S. NRC) to C . G. Pardee, "LaSalle County Station, Units 1 and 2 - Request for Additional Information Related to Request for Relief No. CR-26 (TAC Nos. MD9817 and MD9818)," dated August 13, 2009 In Reference 1, Exelon Generation Company, LLC (EGC) requested relief from the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," for LaSalle County Station (LSCS) Units 1 and 2. Specifically, CR-26 requested relief on the basis that compliance with the specified requirements is impractical due to plant design . This relief applies to the second 10-year interval inservice inspection program, which concluded on October 1, 2007 .
In Reference 2, the NRC requested additional information to complete its review. In response to this request, EGC is providing the attached information.
August 25, 2009 U.S. Nuclear Regulatory Commission Page 2 There are no regulatory commitments contained in this submittal. Should you have any questions concerning this letter, please contact Mr. Kenneth M. Nicely at (630) 657-2803.
Patrick R. Simpson Manager - licensing cc: NRC Regional Administrator, Region III NRC Senior Resident Inspector - LaSalle County Station Attachments :
1 . Response to Request for Additional Information
- 2. Supporting Information
ATTACHMENT 1 Response to Request for Additional Information NRC Request 1 Provide further information to adequately demonstrate the impracticality associated with Weld RH-HX1 B-1 on Residual Heat Removal Heat Exchanger 1 B. Include sketches or drawings as necessary, to show coverage obtained and describe the materials and the ultrasonic techniques applied.
Response
ASME Code Component Affected RH-HX1 B-1, Residual Heat Removal Heat Exchanger 1 B, Shell Head to Nozzle Weld Applicable_Code Reau_irements Table IWC-2500-1, Examination Category C-B, Item Number C2 .21 and Figure IWC-2500-4(a)
ImpracticaLity of Compliance The heat exchanger shell head and nozzle materials are carbon steel. During the ultrasonic examination of the shell head to nozzle, reduced coverage was obtained . The coverage reported represents the aggregate coverage from all scans performed on the weld and adjacent base material . Scanning is limited in the transverse direction . The ultrasonic transducers cannot maintain contact due to the curvature of the nozzle base material in the area of the weld.
Scanning from the nozzle forging side of the welds is not possible due to tapered areas in the forgings . Due to the cladding on the inside diameter, two directional coverage from one side is not possible . In order to scan all of the required volume for this weld, the nozzles would need to be redesigned to allow scanning from the nozzle side of the welds, which is impractical.
Sketches and Drawinas Residual Heat Removal Heat Exchanger 1 B is shown on Struthers Wells Corporation drawing 1-71-09-3097103, Revision 9. This drawing was previously submitted to the NRC in the referenced letter on page 244 of Attachment 4. Weld RH-HX1 B-1 is the head to nozzle weld associated with nozzle N3, and the weld is shown in quadrant C7 of the drawing. A plan view is shown in quadrant C8 of the drawing.
Details on the N3 nozzle on Residual Heat Removal Heat Exchanger 1 B are shown on Struthers Wells Corporation drawing 1-71-04-30971 C3, Revision 2, which is included in .
Ultrasonic Technictues Weld RH-HX1 B-1 was examined in 1996 . The ultrasonic examination is documented on data sheet 96-229, which is included in Attachment 2.
ATTACHMENT 1 Response to Request for Additional Information NRC Request State whether the ASME Code surface examination was completed on the subject weld . If the examinations were performed, what were the results of the examinations?
Response
The ASME Code surface examination was completed on weld RH-HX1 B-1 . There were no limitations and no indications identified during the 1996 examination. The magnetic particle examination data sheet for weld RH-HX1 B-1 (i .e., data sheet # 96-230) is provided in .
NRC Request 3 Address whether or not additional coverage of the subject weld could have been achieved if advanced inspection technologies (e .g., phased array ultrasonic transducers) had been applied .
Response
The components within the scope of relief request CR-26 were examined during the second Inservice Inspection interval, which encompassed the period from October 17, 1994, through September 31, 2007. Accepted inspection technologies for that time period were utilized to complete these examinations . These included updated equipment based on computer modeling of the Residual Heat Removal Heat Exchanger nozzles, and technology resulting from advances in ultrasonic examinations due to the Performance Demonstration Initiative (PDI). At the time, phased array technology was not generally developed by the industry to the point where it could be utilized to perform qualified examinations . Specifically, Exelon Generation Company, LLC's (EGC's) inspection vendor does not yet have a qualified phased array technique for examination of vessel welds . When such advances are available to deliver qualified examinations, they will be assessed to determine whether they can achieve increased inspection coverage .
Reference Letter from P. R. Simpson (Exelon Generation Company, LLC) to U .S. NRC, "Response to Request for Additional Information Regarding Relief Request CR-26," dated May 26, 2009
ATTACHMENT 2 Supporting Information Struthers Wells Corporation drawing 1-71-04-30971C3, Revision 2 (1 page)
Ultrasonic Testing Data Sheet No.96-229 (2 pages)
Magnetic Particle Examination Data Sheet # 96-230 (1 page)
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