Letter Sequence RAI |
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Results
Other: ML12125A181, ML12125A332, ML12131A451, ML12131A473, ML12139A058, ML12180A023, ML12244A571, ML12271A423, ML13029A016, ML14035A575, ML14045A284, ML14052A230, ML14083A617, ML14112A355, ML14112A450, ML14125A199, ML14169A441, ML14169A604, ML14169A637, ML14223A602, ML14281A365, ML14302A302, ULNRC-05886, Enclosure 1, Responses to the Individual Requests Contained in July 5, 2012 RAIs and Enclosure 2, Contains LRA Amendment 5 to Reflect Changes Made as a Result of the RAI Responses, ULNRC-05928, Enclosure 2 to ULNRC-05928, Amendment 15, LRA Updates, ULNRC-05957, Enclosure 2 to ULNRC-05957, Amendment 21, LRA Changes from RAI Responses, ULNRC-05979, Enclosure 2 to ULNRC-05979, Amendment 23, LRA Changes from RAI Responses and Commitment Updates Enclosure 2 Summary Table
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MONTHYEARML12131A4732012-05-15015 May 2012 (Enclosure 4) Environmental Site Audit Regarding Callaway Plant, Unit 1, Project stage: Other ML12125A3322012-05-15015 May 2012 (Enclosure 3) Environmental Site Audit Regarding Callaway Plant, Unit 1 Project stage: Other ML12125A1812012-05-15015 May 2012 Environmental Site Audit Regarding Callaway Plant, Unit 1 Project stage: Other ML12131A4512012-05-15015 May 2012 (Enclosure 2) Environmental Site Audit Regarding Callaway Plant, Unit 1 Project stage: Other ML12139A0582012-05-31031 May 2012 Project Manager Change for the License Renewal Project (Safety) for Callaway Plant, Unit 1 Project stage: Other ML12144A0352012-06-11011 June 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application Project stage: RAI ML12159A1542012-06-22022 June 2012 Summary of Site Audit Related to the Review of the License Renewal Application for Callaway Plant, Unit 1 (TAC Nos. ME7715 and ME7716) Project stage: Approval ML12157A0582012-06-22022 June 2012 Request for Additional Information for the Review of the Callaway Plant, Unit 1, License Renewal Application (TAC ME7708) 6 4 2012 Fmp Neutron Embrittlement and Rv Surveillance RAIs on Yee Chris Sydnor Project stage: RAI ML12164A9052012-07-0505 July 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1, LRA Project stage: RAI ML12172A1112012-07-0909 July 2012 Request for Additional Information for the Review of the Callaway Plant, Unit 1, License Renewal Application, Set 4, Project stage: RAI ML12179A4002012-07-18018 July 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application Project stage: RAI ML12206A2642012-08-0606 August 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 6 Project stage: RAI ML12220A1602012-08-0606 August 2012 Responses to RAI Set #3 and Amendment 5 to the Callaway License Renewal Application (LRA) Project stage: Response to RAI ULNRC-05886, Enclosure 1, Responses to the Individual Requests Contained in July 5, 2012 RAIs and Enclosure 2, Contains LRA Amendment 5 to Reflect Changes Made as a Result of the RAI Responses2012-08-0606 August 2012 Enclosure 1, Responses to the Individual Requests Contained in July 5, 2012 RAIs and Enclosure 2, Contains LRA Amendment 5 to Reflect Changes Made as a Result of the RAI Responses Project stage: Other ML12180A0232012-08-0909 August 2012 Aging Management Programs Audit Report Regarding the Callaway Plant Unit 1 License Renewal Application Project stage: Other ML12271A4232012-08-13013 August 2012 Responses to Environmental RAI Set #1 to the Callaway LRA Project stage: Other ML12216A3382012-08-16016 August 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 7 Project stage: RAI ML12233A6132012-08-23023 August 2012 Request for Additional Information for the Review of the Callaway Plant, Unit 1, License Renewal Application, Set 8, Electrical Project stage: RAI ML12244A5712012-08-30030 August 2012 Responses to E-RAI Set 2 to the License Renewal Application Project stage: Other ML12233A5702012-09-0606 September 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 9 Project stage: RAI ML12284A4542012-09-12012 September 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 10, Public Version Project stage: RAI ML12240A1742012-09-18018 September 2012 Review of the 2011 Refueling Outage Steam Generator Tube Inservice Inspection Reports Project stage: Approval ML12244A4292012-09-18018 September 2012 Summary of Telephone Conference Call Held on August 29, 2012, Between the U.S. Nuclear Regulatory Commission and Union Electric Company, Concerning the Request for Additional Information Pertaining to the Callaway Plant, Unit 1, License Ren Project stage: RAI ML12250A7702012-09-20020 September 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 11 Project stage: RAI ML12256A8952012-09-25025 September 2012 RAI for the Review of the Callaway Plant, Unit 1, LRA, Set 12 Project stage: RAI ML12255A2872012-10-0101 October 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1, License Renewal Application, Set 13 Project stage: RAI ML12262A3112012-10-0202 October 2012 Summary of Telephone Conference Call Held on September 14, 2012, Between NRC and Union Electric Company, Concerning the SAMA RAI for the Callaway Plant, Unit 1, LRA Project stage: RAI ML12270A1472012-10-0303 October 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 14 Project stage: RAI ML12276A3732012-10-12012 October 2012 RAI for the Review of the Callaway Plant Unit 1, LRA Set 15 Project stage: RAI ML12299A2482012-10-24024 October 2012 Responses to RAI Set #11 & #12 and Amendment 13 to the Callaway LRA Project stage: Response to RAI ULNRC-05928, Enclosure 2 to ULNRC-05928, Amendment 15, LRA Updates2012-11-0808 November 2012 Enclosure 2 to ULNRC-05928, Amendment 15, LRA Updates Project stage: Other ML12314A1412012-11-0808 November 2012 Responses to RAI Set #15 and Amendment 15 to the Callaway LRA Project stage: Response to RAI ML12321A1992012-11-29029 November 2012 9/27/12 - Summary of Telephone Conference Call Held Between the NRC and Union Electric Company (Ameren Missouri), Concerning RAIs Pertaining to the Callaway Plant, Unit 1, License Renewal Application Project stage: RAI ML12326A9152012-12-0707 December 2012 RAI for the Review of the Callaway Plant Unit 1, LRA, Set 18 Project stage: RAI ML12342A1722012-12-27027 December 2012 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application Project stage: RAI ML13009A2112013-01-14014 January 2013 Request for Additional Information for the Review of the Callaway Plant 1 License Renewal Application Project stage: RAI ULNRC-05950, Responses to RAI Set 19 & Set 20 and Amendment 20 to the Callaway LRA2013-01-24024 January 2013 Responses to RAI Set 19 & Set 20 and Amendment 20 to the Callaway LRA Project stage: Response to RAI ML13025A0312013-01-30030 January 2013 Request for Additional Information for the Review of the Callaway Plant, Unit 1, License Renewal Application, Set 21 Project stage: RAI ML13029A0162013-02-12012 February 2013 Summary of Telephone Conference Call Held on January 22, 2013, Between the U.S. Nuclear Regulatory Commission Project stage: Other ML13029A6592013-02-12012 February 2013 Summary of Telephone Conference Call Held on December 6, 2012, Between the NRC and Union Electric Company, Concerning Request for Additional Information Pertaining to the Callaway Plant Unit 1, LRA Project stage: RAI ULNRC-05957, Enclosure 2 to ULNRC-05957, Amendment 21, LRA Changes from RAI Responses2013-02-14014 February 2013 Enclosure 2 to ULNRC-05957, Amendment 21, LRA Changes from RAI Responses Project stage: Other ML13046A3072013-02-14014 February 2013 Enclosure 1 to ULNRC-05957, License Renewal Application, Request for Additional Information (RAI) Set #21 Responses Project stage: Request ML13046A3062013-02-14014 February 2013 Response to RAI Set #21 and Amendment 21 to the Callaway LRA Project stage: Response to RAI ML13038A3082013-02-21021 February 2013 RAI for the Review of the Callaway Plant Unit 1, LRA, Set 22 Project stage: RAI ML12307A3912013-02-26026 February 2013 Schedule Revision for the Environmental Review of the Callaway Plant, Unit 1 License Renewal Application (TAC Nos. ME7715 and ME7716) Project stage: Approval ML13063A4762013-02-28028 February 2013 Response to RAI Set #22 and Amendment 22 to the Callaway LRA Project stage: Response to RAI ML13059A8002013-03-11011 March 2013 Summary of Telephone Call Held on 11/5/12, Between NRC and Union Electric Company, Regarding Request for Clarification of Responses to the SAMA RAI Concerning Callaway Plant, Unit 1, LRA Project stage: RAI ML13042A0422013-03-26026 March 2013 Request for Additional Information for the Review of the Callaway Plant Unit 1 License Renewal Application, Set 23 Project stage: RAI ML13058A1242013-03-29029 March 2013 Request for Additional Information for the Review of the Callaway Plant, Unit 1, License Renewal Application, Set 24 Project stage: RAI ULNRC-05979, Enclosure 2 to ULNRC-05979, Amendment 23, LRA Changes from RAI Responses and Commitment Updates Enclosure 2 Summary Table2013-04-26026 April 2013 Enclosure 2 to ULNRC-05979, Amendment 23, LRA Changes from RAI Responses and Commitment Updates Enclosure 2 Summary Table Project stage: Other 2012-08-30
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Category:Request for Additional Information (RAI)
MONTHYEARML23200A2982023-07-19019 July 2023 NRR E-mail Capture - Callaway Plant, Unit 1 - Final Request for Additional Information (RAI) - Request for Approval of Oqam, Revision 36a - EPID L-2023-LLQ-0000 ML23174A1272023-06-23023 June 2023 Cw FFD Document Request List 2023 ML23158A1462023-06-13013 June 2023 Notification of Post-Approval Site Inspection for License Renewal and Request for Information Inspection (05000483/2023010) ML23163A1572023-06-0606 June 2023 In-service Inspection Request for Information ML23096A0072023-04-0505 April 2023 NRR E-mail Capture - Final Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request to Revise TS 5.5.16 for Permanent Extension of Integrated Leak Rate Testing - EPID L-2022-LLA-0165 ML23080A1382023-03-21021 March 2023 Notification of Inspection (NRC Inspection Report 05000483/2023003) and Request for Information ML23073A0262023-03-13013 March 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - SG Inspection Report Review - EPID L-2022-LRO-0143 ML23037A7092023-02-0606 February 2023 April 2023 Emergency Preparedness Exercise Inspection - Request for Information ML23026A0212023-01-24024 January 2023 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Changes to TS for SFP - ML22287A0952022-10-14014 October 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22269A4312022-09-26026 September 2022 November 2022 Emergency Preparedness Program Inspection - Request for Information ML22173A0562022-06-22022 June 2022 Information Request, Security IR 2022402 ML22167A0252022-06-15015 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - LAR for Proposed Revision to Radiological Emergency Response Plan Regarding Response & Notification Goals - EPID L-2022-LLA-0024 ML22157A0572022-06-0606 June 2022 Notification of NRC Design Bases Assurance Inspection (Programs) (05000483/2022013) and Request for Information ML22154A0122022-06-0202 June 2022 NRR E-mail Capture - Final - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22151A0512022-05-27027 May 2022 NRR E-mail Capture - Final - Request for Additional Information - Columbia Generating Station - LAR to Change TS 3.4.11 - Reactor Coolant System Pressure and Temperature Limits - EPID L-2021-LLA-0191 ML22137A0292022-05-16016 May 2022 NRR E-mail Capture - Draft - Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications - EPID L-2021-LLA-0177 ML22096A0232022-04-0505 April 2022 NRR E-mail Capture - Callaway Plant - Final RAIs - License Amendment and Regulatory Exemptions for a Risk-Informed Approach to Address Generic Safety Issue - 191 and Respond to GL 2004-02 (EPIDs L-2021-LLA-0059 and L-2021-LLE-0021) ML21336A6392021-12-0202 December 2021 .05 Sec Doc Request ML21319A0062021-11-30030 November 2021 Supplemental Information Needed for Acceptance of Requested Licensing Actions License Amendment Request for Adoption of Alternate Source Term and Revision of Technical Specifications ML21258A0382021-09-14014 September 2021 NRR E-mail Capture - Final - Request for Additional Information - Callaway, Unit 1 - LAR to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors- EPID L-2020-LLA-023 ML21159A2352021-06-17017 June 2021 Notification of NRC Triennial Heat Exchanger/Heat Sink Performance Inspection (05000483/2021003) and Request for Information ML21130A5882021-05-11011 May 2021 Supplemental Information Needed for Acceptance of Requested Licensing Actions to Adopt a Risk-Informed Approach to Address GSI-191 and Respond to Generic Letter 2004 02 ML21088A3872021-03-30030 March 2021 Notification of Evaluations of Changes, Tests, and Experiments Inspection (Inspection Report 05000483/2021002) and Request for Information ML21007A1622021-01-0606 January 2021 NRR E-mail Capture - Final - Request for Additional Information - (COVID-19) Callaway Plant, Unit 1 - Additional Request for Exemption from Specific Requirements of 10 CFR Part 26, Fitness for Duty Programs - EPID L-2021-LLE-0242 ML20203M3682020-07-21021 July 2020 NRR E-mail Capture - Draft Request for Additional Information - Callaway Plant, Unit 1 - License Amendment Request - Revision to Technical Specification (TS) 5.3.1 and Deletion of TS 5.3.1.1 and 5.3.1.2 - EPID L-2020-LLA-0046 ML20162A1882020-06-10010 June 2020 Request for Supporting Information for the Callaway SPRA Audit Review - Draft Supplement ML20280A5442020-03-25025 March 2020 Cwy 2020 PIR Request for Information ML20064B6582020-02-27027 February 2020 Second, Third, and Fourth Request for Information for Callaway Dba Teams Inspection 2020011 ML19317E6332019-11-13013 November 2019 Request for Supporting Information for the Callaway SPRA Audit Review ML19107A5152019-04-11011 April 2019 Cwy 2019410 RFI Cyber Security Gap ML19078A2932019-03-18018 March 2019 Notification of an NRC Triennial Fire Protection Baseline Inspection (NRC Inspection Report 05000483/2019010) and Request for Information ML19023A2032019-01-22022 January 2019 Notification of NRC Triennial Heat Sink Performance Inspection (05000483/2019001) and Request for Information ML19009A3442019-01-0909 January 2019 NRR E-mail Capture - Formal Release of RAIs Ref: Callaway Plant Class 1E LAR, L-2018-LLA-0062 ML18355A4882018-12-20020 December 2018 NRR E-mail Capture - Formal Release of RAI Ref: Callaway Plant EAL Changes, L-2018-LLA-0239 ML18331A2052018-11-27027 November 2018 NRR E-mail Capture - Formal Release of RAIs Ref: Callaway Relief Request EPID L-2018-LLR-0051 ML18025B4672018-01-24024 January 2018 NRR E-mail Capture - Request for Extension of Due Date for RAI Response ML17304B1912017-10-31031 October 2017 NRR E-mail Capture - Requests for Additional Information Concerning Callaway License Amendment - Thermal Overload Protection ML17142A1352017-05-19019 May 2017 Notification of NRC Design Bases Assurance Inspection (05000483/2017007) and Initial Request for Information ML17115A0622017-04-25025 April 2017 NRR E-mail Capture - Requests for Additional Information -- Callaway Plant, Unit 1, Technical Specification 5.6.5, Core Operating Limits Report CAC MF8463 ML17038A2292017-02-0707 February 2017 NRR E-mail Capture - RAI Formal Release for Callaway SG Tube Inspection Report, MF8474 ML16111B3222016-04-20020 April 2016 Notification of Evaluations of Changes, Tests, and Experiments, and Permanent Plant Modifications Inspection (05000483/2016007) and Request for Information ML15316A1532015-11-12012 November 2015 Request for Additional Information Email, Relief Request 13R-11 (Pressurizer Welds) from Code Case N-460 Requirements, Third 10-Year Inservice Inspection Interval ML15096A0942015-04-0606 April 2015 Notification of Inspection (NRC Inspection Report 05000483/2015003) and Request for Information ML14353A1172014-12-22022 December 2014 Request for Additional Information, Round 3, License Amendment Request to Revise Final Safety Analysis Report Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ML14294A7752014-10-28028 October 2014 Request for Additional Information, Round 2, License Amendment Request to Revise Final Safety Analysis Report Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ML14203A0632014-07-25025 July 2014 Request for Additional Information, Relief Request I3R-17, Proposed Alternative to ASME Code, Section XI Requirements, Which Extends Rv ISI Frequency from 10 to 20 Years, Third 10-Year ISI Interval ML14178A8232014-07-0101 July 2014 Request for Additional Information, License Amendment Request to Revise Final Safety Analysis Report- Standard Plant Section 3.6 for High Density Polyethylene (Hdpe) Crack Exclusion ULNRC-06117, Callaway Plant, Unit 1, License Revewal Application, Request for Additional Information (RAI) Set 31 Responses2014-04-24024 April 2014 Callaway Plant, Unit 1, License Revewal Application, Request for Additional Information (RAI) Set 31 Responses ML14114A1102014-04-24024 April 2014 License Revewal Application, Request for Additional Information (RAI) Set 31 Responses 2023-07-19
[Table view] Category:Letter
MONTHYEARULNRC-06853, Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.7172024-01-29029 January 2024 Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.717 IR 05000483/20230042024-01-19019 January 2024 Integrated Inspection Report 05000483/2023004 ML24008A0552024-01-19019 January 2024 Acceptance of Requested Licensing Action - Proposed Alternative to the Requirements of the ASME Code (EPID L-2023-LLR- 0061) ML23353A1712024-01-18018 January 2024 Issuance of Amendment No. 237 to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 ML23317A0012024-01-12012 January 2024 Audit Summary Regarding LAR to Clarify Support System Requirements for the Residual Heat Removal and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 ML23347A1212024-01-11011 January 2024 Issuance of Amendment No. 236 to Adopt TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube Volume Values to Licensee Control EPID L-2023-LLA-0046) ML24011A1492024-01-11011 January 2024 Notification of Post-Approval Site Inspection for License Renewal and Request for Information (05000483/2024011) ULNRC-06847, Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01)2023-12-21021 December 2023 Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01) ULNRC-06849, License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds2023-12-20020 December 2023 License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds ML23346A0392023-12-14014 December 2023 Supplemental Information Needed for Acceptance of Requested Licensing Action Request for Relief from Requirements of ASME Code, Section Xl, Examination and Testing Unbonded Post-Tensioning System ULNRC-06844, Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification2023-12-0707 December 2023 Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification 05000483/LER-2023-001, Submittal of LER 2023-001-00 for Callaway, Unit 1, Inoperable Instrument Tunnel Sump Level Indication Resulted in Condition Prohibited by Technical Specifications2023-11-29029 November 2023 Submittal of LER 2023-001-00 for Callaway, Unit 1, Inoperable Instrument Tunnel Sump Level Indication Resulted in Condition Prohibited by Technical Specifications ULNRC-06827, Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2023-11-20020 November 2023 Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) IR 05000483/20230102023-11-15015 November 2023 NRC License Renewal Phase 1 Inspection Report 05000483 2023010 IR 05000483/20233012023-11-0909 November 2023 NRC Examination Report 05000483-2023301 ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV ML23297A2502023-11-0606 November 2023 Individual Notice of Consideration of Issuance of Amendment to Renewed Facility Operating License, Proposed No Significant Hazards Consideration Determination and Opportunity for a Hearing (EPID L-2022-LLA-0176) - Letter IR 05000483/20240122023-10-24024 October 2023 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection (05000483/2024012) ML23293A2652023-10-24024 October 2023 3rd Quarter 2023 Integrated Inspection Report ML23240A3692023-10-0505 October 2023 Issuance of Amendment No. 235 to Revise Technical Specifications to Use of Framatome Gaia Fuel (EPID L-2022-LLA-0150) (Non-Proprietary) ML23234A1522023-10-0505 October 2023 Exemption from the Requirements of 10 CFR Part 50, Section 50.46, and Appendix K Regarding Use of M5 Cladding Material (EPID L-2022-LLE-0030) (Letter) ML23305A0942023-10-0202 October 2023 10-CW-2023-09 Post-Exam Submittal ML23270B9662023-09-27027 September 2023 10 CFR 50.55a(z)(I) Request for Relief from ASME OM Code Pump and Valve Testing Requirements for Fifth 120-Month Inservice Testing Interval ML23228A0252023-09-25025 September 2023 Issuance of Amendment No. 234 to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies ML23261C3852023-09-25025 September 2023 Safety Evaluation for Operating Quality Assurance Manual Revision 36A ML23166B0882023-09-20020 September 2023 Issuance of Amendment No. 233 for Adoption of Alternative Source Term and Revision of Technical Specifications ML23206A1992023-09-15015 September 2023 Regulatory Audit Summary Regarding License Amendment and Regulatory Exemptions Request for Fuel Transition to Framatome Gaia Fuel (Epids L-2022-LLA-0150 and L-2022-LLE-0030) IR 05000483/20234012023-09-13013 September 2023 NRC Security Baseline Inspection Report 05000483/2023401 ML23240A7572023-08-31031 August 2023 NRC Initial Operator Licensing Examination Approval 05000483/2023301 IR 05000483/20230052023-08-23023 August 2023 Updated Inspection Plan for Callaway Nuclear Power Plant, Unit 1 (Report 05000483/2023005) - Mid Cycle Letter 2023 ULNRC-06824, Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A2023-08-17017 August 2023 Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A ML23219A1392023-08-15015 August 2023 Request for Withholding Information from Public Disclosure ULNRC-06830, Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak2023-08-15015 August 2023 Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak ML23215A1972023-08-0303 August 2023 Supplement to License Amendment and Exemption Request Regarding Use of Framatome Gaia Fuel (LDCN 22-0002) ULNRC-06223, Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004)2023-07-25025 July 2023 Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004) ULNRC-06799, Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications2023-07-13013 July 2023 Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications IR 05000483/20230022023-07-10010 July 2023 Integrated Inspection Report 05000483/2023002 ML23174A1272023-06-23023 June 2023 Cw FFD Document Request List 2023 ML23171A9942023-06-22022 June 2023 Acceptance of Request for Approval of Operating Quality Assurance Manual Revision 36a ULNRC-06821, Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301)2023-06-21021 June 2023 Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301) IR 05000483/20230112023-06-15015 June 2023 Comprehensive Engineering Team Inspection (CETI) Inspection Report 05000483/2023011 ULNRC-06822, Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a2023-06-14014 June 2023 Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a ML23158A1462023-06-13013 June 2023 Notification of Post-Approval Site Inspection for License Renewal and Request for Information Inspection (05000483/2023010) ULNRC-06815, Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a2023-06-0505 June 2023 Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a ULNRC-06818, Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate .2023-06-0505 June 2023 Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate . ML23093A0952023-05-10010 May 2023 Issuance of Amendment No. 232 Regarding Technical Specification Changes for Spent Fuel Storage ULNRC-06816, Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015)2023-05-0909 May 2023 Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015) ML23129A7942023-05-0909 May 2023 Post-Audit Supplement to License Amendment Request and Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (Iepid L-2022-LLA-0150 and EPID L-2022-LLE-0030) ML23122A3172023-05-0808 May 2023 Review of the Spring 2022 Steam Generator Tube Inservice Inspections ML23118A3492023-05-0808 May 2023 Request for Withholding Information from Public Disclosure 2024-01-29
[Table view] |
Text
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NUCLEAR REGULATORY COMMISSION t!! C'l WASHINGTON, D.C. 20555-0001
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Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT, UNIT 1 LICENSE RENEWAL APPLICATION, SET 23 (TAC NO. ME7708)
Dear Mr. Heflin:
By letter dated December 15, 2011, Union Electric Company (Ameren Missouri) (the applicant) submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54 (10 CFR Part 54) for renewal of Operating License No. NPF-30 for the Callaway Plant, Unit 1 (Callaway). The staff of the U.S. Nuclear Regulatory Commission is reviewing this application in accordance with the guidance in NUREG-1800, "Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants." During its review, the staff has identified areas where additional information is needed to complete the review. The staff's requests for additional information are included in the enclosure. Further requests for additional information may be issued in the future.
Items in the enclosure were discussed with Sarah G. Kovaleski, of your staff, and a mutually agreeable date for the response is within 30 days from the date of this letter. If you have any questions, please contact me by telephone at 301-415-2946 or bye-mail at Samuel.CuadradoDeJesus@nrc.gov.
Sincerely, m el Cuadrado de Jesus, P ]ect Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-483
Enclosure:
As stated cc w/encl: Listserv
March 26, 2013 Mr. Adam C. Heflin Senior Vice President and Chief Nuclear Officer Union Electric Company P.O. Box 620 Fulton, MO 65251
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT, UNIT 1 LICENSE RENEWAL APPLICATION, SET 23 (TAC NO. ME7708)
Dear Mr. Heflin:
By letter dated December 15, 2011, Union Electric Company (Ameren Missouri) (the applicant) submitted an application pursuant to Title 10 of the Code of Federal Regulations Part 54 (10 CFR Part 54) for renewal of Operating License No. NPF-30 for the Callaway Plant, Unit 1 (Callaway). The staff of the U.S. Nuclear Regulatory Commission (NRC) is reviewing this application in accordance with the guidance in NUREG-1800, "Standard Review Plan for Review of License Renewal Applications for Nuclear Power Plants." During its review, the staff has identified areas where additional information is needed to complete the review. The staff's requests for additional information are included in the enclosure. Further requests for additional information may be issued in the future.
Items in the enclosure were discussed with Sarah G. Kovaleski, of your staff, and a mutually agreeable date for the response is within 30 days 'from the date of this letter. If you have any questions, please contact me by telephone at 301-415-2946 or bye-mail at Samuel.CuadradoDeJesus@nrc.gov.
Sincerely, IRA!
Samuel Cuadrado de Jesus, Project Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket No. 50-483
Enclosure:
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See next page ADAMS Accession No.: ML13042A042 OFFICE LA:DLR/RPB1* PM:DLR/RPB1 BC:DLRI LR/RPB1 NAME YEdmonds SCuadrado DMorey I SCuadrado DATE 2/22/2013 3/18/2013 3/26/2013 3/26/2013 OFFICIAL RECORD COpy
CALLAWAY PLANT UNIT 1 LICENSE RENEWAL APPLICATION REQUEST FOR ADDITIONAL INFORMATION, SET 23 RAI B2.1.3-1 b
Background:
By letter dated November 20, 2012, the applicant responded to RAI B2.1.3-1 a, and stated that the threads for stud No. 18 and its stud hole were inspected immediately prior to installation of the stud. The applicant also stated that when the stud became stuck, excessive force was not used in an attempt to free the stud, and therefore no threads were damaged by installation of the stud. The applicant further stated that although the threads of stud No. 18 have not been inspected for damage due to wear or corrosion, the other 53 reactor vessel studs and stud holes have been inspected. The applicant also stated that since 1992, no damage to the threads of the other studs and stud holes has been observed. The applicant further stated that since stud No. 18 is exposed to the same environment as the other studs, except during refueling, it is reasonable to conclude that damage to the threads due to corrosion or wear has not occurred.
The applicant stated that the ultrasonic test (UT) examination is capable of identifying cracking and severe corrosion of the threads.
In addition, the applicant provided a sketch of the stuck stud and the stud hole to demonstrate its basis that with the stud 2 5/8 inches from the bottom of the stud hole, the stuck stud still has 6.505 inches of thread engagement. The applicant also provided the basis for stating that only 6.31 inches of thread engagement is required to meet the ASME code limits.
Issue:
The staff finds that the applicant's response still did not address the possibility of thread damage to the vessel flange or stud threads as a result of the stud getting stuck. In addition, in its response to RAI B2.1.3-1, the applicant had stated that stud No. 18 had two locations on threads 10 and 11 which were reworked just prior to the stud getting stuck (burrs which were removed).
The staff noted that the applicant is assuming that conditions for the stuck stud are the same as the others without providing any technical basis. The staff noted that at the location of the stuck stud, the stresses would be higher than at the other locations due to less thread engagement.
Furthermore, the staff noted that the applicant is assuming that future tensioning and de tensioning operations will not cause any wear, and that there will be no loss of material due to corrosion. The staff finds that this reasoning is nonconservative and contrary to the engineering evaluations performed in 1987 and 1989, which the applicant has relied on to justify the continued the use of stud No. 18 in its current stuck position. Specifically, the 1989 evaluation recommended that if damage approaches the limiting value (6.3 inches of engagement or 19.5 threads missing), or if the vessel is operated with a missing stud, vessel hydrotest should be Enclosure
-2 avoided, and the plant heat up rate should be limited to half the design value in order to minimize the risk of localized plastic deformation.
The staff also noted that, as stated by the applicant in its response, the current UT examinations performed on the stuck stud and its flange hole would only be able to detect cracking or severe thread corrosion. Since the number of fully engaged threads for this location is near the acceptance level, a marginal reduction in the number of properly engaged threads may bring the effective number of engaged threads below the acceptance criteria. Furthermore, the staff does not agree with the applicant's assertion that the conditions at this location are typical of the remaining 53 locations. Specifically, since the stud at No. 18 is stuck 2 5/8 inches from the bottom of the flange hole and has fewer threads engaged, it has higher stresses than those that have no thread damage or more threads engaged. As stated earlier, this location would be more susceptible to localized plastic deformation.
Since the applicant's stated acceptance criteria for the minimum allowable thread engagement (6.31 inches) is very close to the acceptable calculated thread engagement for stud No. 18 (6.505 inches). The staff does not have reasonable assurance that the applicant's current UT examinations will detect thread degradation prior to exceeding the acceptance criteria.
Request:
Clarify how the applicant's aging management program will detect thread damage on the stud and vessel flange hole threads at locations with stuck studs, as the future condition of these threads cannot be deterministically verified given the applicant's current assumption and inspection methodology if a stud remains in place.
RAI B2.1.3-2b
Background:
By letter dated November 20,2012, the applicant responded to RAI B2.1.3-2a, stated that review of plant records confirmed that reactor vessel stud No. 15 was replaced in June of 1984, and stud No. 35 was replaced in the spring of 1989. The applicant also stated that these studs were replaced due to thread damage. The applicant further stated that no other repair or replacement activities were discovered in the review of plant records.
In addition, the applicant provided a brief summary of two engineering evaluations which were performed on its RV closure head studs in 1987 and 1989. The applicant stated that the two evaluations were related to the problems the applicant has experienced with the reactor vessel studs and flange threads. The applicant stated that both of the evaluations addressed minimum thread engagement, and based on those evaluations the value of 6.31 inches has been used by the applicant to determine acceptability of the reactor vessel stud thread engagement. The applicant further stated that the 1989 evaluation provided criteria for taking partial credit for damaged threads, however all damaged threads were removed from the stud holes in 1989 and 1992, and all studs with damaged threads were replaced.
-3 The applicant stated that the first evaluation was performed in 1987, when in refueling outage (RFO) 2, five reactor vessel studs became stuck. The applicant also stated that the evaluation provided justification for operation in the subsequent cycle with one stud untensioned and the other four studs with partial engagement. The applicant further stated that the evaluation provided three recommendations in addition to the conclusion that the plant could operate with stud No.2 IJntensioned. The applicant stated that all three recommendations were satisfied.
In addition, the applicant stated that the purpose of the 1989 report was to develop criteria to accept or reject reactor vessel thread degradation on a generic basis. The applicant also stated that the report provided five recommendations. The applicant further stated that it has met all five recommendations.
Issue:
During its review, the staff noted that both evaluations (1987 and 1989) assumed that, with the exception of the five studs hole locations (Nos. 2, 4, 5, 7, and 9) all the other remaining studs and stud hole threads had no degradation. Furthermore, the 1989 report also anticipated that a laser inspection technique would be used to accurately evaluate thread damage at the facility, noting that the laser inspection technique would yield high quality profile of damaged threads; the report further stated that care should be exercised in the evaluation of areas with uniform wear, because they may appear intact but may in fact be out of tolerance. It is not clear to the staff whether the applicant has employed this specific technique in evaluating thread damage.
In contrast to the conditions assumed in the 1987 and 1989 evaluations, additional stud hole locations have known thread damage (Le., 13,25,39,53, and 54). Furthermore, stud No. 18 has been stuck since 1996, with partial thread engagement. The staff also noted that the affected locations are mostly on one side of the RPV flange periphery.
In addition, during review of the applicant's reply, the staff noted that recommendation 2 (from the 1989 report), stated in part that studs used in vessel flange holes with degraded threads should be free from damage. Since the applicant stated that two threads on the No. 18 stud were re-worked, it is not clear to the staff that recommendation 2 from the 1989 report will be met for this location. Furthermore, recommendation 4 (also from the 1989 report) states in part that if damage approaches the limiting values, or if the vessel is operated with a missing stud, vessel hyrdotests should be avoided, and the plant heat-up rate limited to 50 °F/hr in order to minimize the risk of localized plastic deformation. It is not clear to the staff that this aspect of recommendation 4 is met.
Request:
a) Clarify if the thread inspections for the vessel flange hole and stud threads include a laser inspection method referenced in the 1989 report, which can accurately gauge thread degradation so that there is assurance that any damage which is present does not exceed the acceptance criteria prior to the next inspection.
b) The evaluations performed in 1987 and 1989 assumed that with the exception of location Nos. 2, 4, 5, 7, and 9, there were no other damaged locations. Since additional
-4 damage has occurred, provide justification that the evaluations and the acceptance criteria provided by these reports will be valid during the period of extended operation and that the overall adequacy of the entire RPV flange assembly will be adequately managed during the period of extended operation.
Follow-up RAI 4.3-22:
Background:
In its response dated October 11, 2012, to Part (c) of RAI4.3-20, the applicant made the following assumptions:
- The applicant stated that "it is assumed that the same fatigue curves for each material were used for the analyses relied upon for the screening." It is not clear to the staff how the applicant justified or verified that the assumption is valid for its components.
- The applicant also stated that "the level of analytical rigor has not been specially reviewed." It is not clear how the applicant can draw conclusions from a comparison of its fatigue analyses for the Environmentally Assisted Fatigue (EAF) screening. The applicant has not substantiated its conclusion that the cumulative usage factor (CUF) values are expected to have been performed using the same level of rigor.
- The applicant also claimed that "[b]ased on analytical experience and engineering judgment, the relative design report CUF values of the components indicate that any transient lumping used in the various analyses have not skewed the screening and ranking results." However, the applicant did not further elaborate or discuss the specific "engineering jUdgment" it used and any associated actions to come to the conclusion that transient lumping did not skew the EAF screening and ranking results.
In its response dated October 11, 2012, to Part (a) of RAI 4.3-21, as revised by letter dated December 13,2012, the applicant made the following assumption:
- The applicant assumed that the comparison of CUF including the effects of the environment (U en ) calculations across multiple thermal zones is valid. The applicant provided an example supporting one of its principles for removing "sentinel locations" that one thermal zone can bound another thermal zone is conservative. The staff noted that the original design reports may have been performed by different vendors, which may result in different fatigue analyses performed at different times. The applicant has not demonstrated that the level of rigor is comparable across these different design reports. Three examples of this are whether the transients are consistently bundled or not bundled in the calculation of different CUF values, whether consistent material properties are used, and whether the American Society of Mechanical Engineers (ASME) Code editions are consistent.
- 5 Issue:
In essence, the staff noted that the applicant has not demonstrated that the Uen values of the applicant's systems were calculated with the same level of rigor or conservatism. Without demonstrating that the Uen values share a common calculational basis, the resulting ranking and comparisons may not appropriately determine the "sentinel" locations to be monitored by the Fatigue Monitoring Program.
Request:
For each of the four assumptions identified above and any other assumptions made, provide plant-specific situations that are based on the applicant's data and analyses to further justify that these assumptions would allow meaningful and valid comparisons among calculated Uen values at the applicant's facility.
Follow-up RAI4.3-23
Background:
In its letter dated December 13, 2012, the applicant revised LRA Section 4.3.4 stating that a location that can be shown to be bounded by another location on a "common basis stress evaluation" may be removed from the "sentinel location" list. The applicant provided a qualitative explanation that this judgment relies upon the comparison of transients in terms of severity and/or number of occurrences.
Issue:
In order for the staff to determine whether the "common basis stress evaluation" is appropriate or valid for the applicant's facility, additional information is needed related to the scope, parameters considered, and assumptions involved.
Request:
(a) Clarify whether the "common basis stress evaluation" performed the comparison of only the transient severity and the number of transient occurrences.
- 1. If yes, justify why comparing only severity and the number of occurrences would result in a valid evaluation to eliminate a sentinel location.
- 2. If not, identify all other parameters that were used in the comparison and justify that those parameters are sufficient to evaluate the elimination of a sentinel location.
(b) Justify why the geometry of the locations (whether it is a straight pipe, a nozzle, a tee, or a gO-degree bend) being compared does not need to be considered for the charging nozzle/chemical and volume control (CVCS) system.
- 6 (c) Clarify whether the locations being compared must be the same type of materials. If not, justify that the "common basis stress evaluation" is valid when comparing different types of materials.
(d) Clarify whether the stress, CUF, or Uen values of the locations has been used in the "common basis stress evaluation." Clarify whether the stress, CUF, or Uen values have been reviewed to confirm that the results of the common basis stress evaluation are valid for the applicant's site.
(e) Clarify whether the charging nozzle/CVCS system is the only example where a "common basis stress evaluation" was performed. If not, identify all systems in the applicant's site that a "common basis stress evaluation" was performed to remove location(s) from the "sentinel location" list and justify that the common basis stress evaluation is valid.
Follow-up RAI 4.3-24:
Background:
In its response dated October 11, 2012 to Part (d) of RAI 4.3-21, as revised by letter dated December 13, 2012, the applicant provided an example supporting one of its principles that one material can bound other materials in the same thermal zone. The applicant also stated in its revised LRA dated December 13, 2012, that a location that can be shown to be bounded by another location on a common basis stress evaluation may be removed from the "sentinel location" list. The applicant indicated that those plant-specific locations, in LRA Table 4.3-6, with Uen greater than 1.0 will be evaluated further using the same methods as those to remove conservatisms for NUREG/CR-6260 locations described in LRA Section 4.3.4.
Issue:
The staff noted that the Uen value of different materials may respond differently when the EAF is being refined in the future. Using the information in Part (d) of RAI 4.3-21 as an example, the action to refine the Uen of the stainless steel Pressurizer Instrument Nozzle will not always proportionally refine the Uen of the low alloy steel for the Pressurizer Upper Head/Upper Shell.
The applicant has not justified that the low alloy steel components would remain bounded by the stainless steel components after the EAF has been refined to reduce the Uen of the stainless steel components. The applicant has not explained how nor justified that the refinement of a higher Uen , in LRA Table 4.3-6, of one material would ensure the reduction of Uen for a bounded location of another material.
Reguest:
(a) Justify that the refinement of a higher Uen ) in LRA Table 4.3-6, of one material would ensure the reduction of the Uen for a bounded location of another material, such that the conclusion that one material bounds other materials in the same thermal zone will remain valid.
-7 (b) Justify that the refinement of a higher Uen , in LRA Table 4.3-6, of one location would ensure the reduction of the Uen for a bounded location, such that the conclusion from the common basis stress evaluation will remain valid.
Follow-up RAI4.3-25
Background:
The elastic modulus, E, to be used for the austenitic stainless steel fatigue curve in Figure 1-9.2 in the ASME Code Section III Appendix I, has changed from 26 x1 06 psi in the 1980 edition to 28.3x106 psi in the 1983 edition.
Issue:
It is not clear to the staff whether the change in the stainless steel material property in the aforementioned ASME Code editions has been considered in the Uen comparison.
Request:
Identify all the stainless steel components that were designed to the ASME Code editions that were after the 1980 edition. For each of these components, clarify whether the corresponding thermal zone bounded another stainless steel component that was designed to the 1980 ASME Code edition or earlier. Justify that the comparison of Uen values that were calculated with different code editions is appropriate when the values of the elastic modulus are different.
Follow-up RAI 4.3-26
Background:
In its response dated October 11, 2012, to Parts (d) of RAI 4.3-21, as revised by letter dated December 13,2012, the applicant stated that the EAF screening was revised to not use the equation in NUREG/CR-6909 for the Fen of Ni-Cr-Fe; instead, the revised calculation used NUREG/CR-5704 to compute Fen values for Ni-Cr-Fe material. The applicant also revised LRA Table 4.3-7 indicating two Ni-Cr-Fe components (RPV Bottom Head Instrument tubes and RSG Tube-to-tubesheet connection) as the "sentinel locations."
Issue:
The staff noted that in LRA Table 3.1.2.3, there are nickel alloy pressurizer safe ends that are exposed to the reactor coolant environment with the aging effects of cumulative fatigue damage.
The staff noted that given the Fen value calculated using NUREG/CR-5704 is typically greater than 10, there is a high probability that nickel alloy components would be identified as "sentinel locations." The staff did not find any reference related to these nickel alloy components as "sentinellocations" from the list in LRA Table 4.3-7. It is not clear to the staff how this component has been bounded by the three stainless steel pressurizer locations identified in LRA Table 4.3-7.
- 8 Request:
Identify the nickel alloy component(s) in the pressurizer safe ends and the associated CUF and Fen values. Demonstrate how the nickel alloy locations have been bounded by the three stainless steel pressurizer locations identified in LRA Table 4.3-7.
Follow-up RAI 4.3-27
Background:
The applicant stated in its Fatigue Monitoring Program that, for the Cycle-Based Fatigue (CBF) monitoring method, the fatigue accumulation is tracked to determine the approach to the ASME Code allowable fatigue limit of 1.0. Enhancement 6 of the program stated that procedures will be enhanced to include additional "cycle-count action limits" and "fatigue usage action limits,"
which will allow adequate time for completion of corrective actions if the "design limits" are projected to be exceeded within the next three fuel cycles.
Issue:
In its letter dated December 13, 2012, the applicant revised LRA Section 4.3.4, indicating that the 60-year projected Uen is 0.74 for the safety injection nozzle. The staff noted that the 60-year projected cycle counts are the same as the numbers of cycles to-date for three transients assumed in the safety injection nozzle EAF analysis.
The staff noted that the premise of CBF is that the incremental fatigue usage of each transient can be accumulated to provide a fatigue usage as the components are being monitored during the period of extended operation. Furthermore, the fatigue accumulation is calculated in accordance with the ASME Code because the incremental fatigue usage for each transient was supported by a fatigue analysis with an assumed number of occurrences for each transient.
However, the staff noted the incremental fatigue usage may change after the number of occurrences of a transient had exceeded that assumed in the fatigue analysis. This happens because of the transient-pairing provision delineated in ASME Code Section III Paragraph NB-3222.4(e)(5).
Request:
(a) Clarify how the incremental fatigue usage and fatigue accumulation will be tracked when the cycle count is beyond those assumed in the fatigue analysis. Justify that, prior to reaching the "fatigue-usage action limit," incremental fatigue usage for additional occurrences beyond those assumed in the fatigue analysis will be calculated in accordance with the ASME Code.
(b) Justify that, for the safety injection nozzle, the implementation of a "fatigue-usage action limit" would ensure that corrective action will be initiated before exceeding the design limit.
- 9 (c) For all the locations monitored by CBF. clarify whether the safety injection nozzle is the only location that was analyzed for the number of transient cycles to-date. If not, identify all the locations that were analyzed for their respective number of cycles to-date and justify that the implementation of "fatigue-usage action limits" would ensure that corrective action will be initiated before a location exceeds its design limit.
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION FOR THE REVIEW OF THE CALLAWAY PLANT, UNIT 1, LICENSE RENEWAL APPLICATION, SET 23 (TAC NO. ME7708)
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