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Category:Letter
MONTHYEARIR 05000461/20230042024-02-0202 February 2024
Integrated Inspection Report 05000461/2023004
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Audit Plan in Support of Review of License Amendment Request Regarding Revision of Technical Specifications Related to Reactor Water Cleanup Isolation
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IR 05000461/20234022023-12-27027 December 2023
Security Baseline Inspection Report 05000461/2023402
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IR 05000461/20235012023-12-0505 December 2023
Emergency Preparedness Biennial Exercise Inspection Report 05000461/2023501
ML23284A2512023-11-22022 November 2023
Amendment No. 250 to Adopt TSTF-332
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Constellation Energy Generation, LLC - 2023 Annual Report - Guarantees of Payment of Deferred Premiums
IR 05000461/20230032023-11-0808 November 2023
Integrated Inspection Report 05000461/2023003
ML22300A2212023-11-0202 November 2023
Preliminary Decommissioning Cost Estimate and Fuel Management Plan
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
IR 05000461/20233012023-09-12012 September 2023
NRC Initial License Examination Report 05000461/2023301
RS-23-090, Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station2023-09-0707 September 2023
Annual Report of Emergency Core Cooling System Evaluation Model Changes and Errors for Clinton Power Station
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 - Delete Flux Monitors Specific Overlap Requirement SRs2023-08-30030 August 2023
Constellation Energy Generation, LLC, Application to Revise Technical Specifications to Adopt TSTF-264-A, Revision 0, 3.3.9 and 3.3.10 - Delete Flux Monitors Specific Overlap Requirement SRs
IR 05000461/20234202023-08-29029 August 2023
Security Baseline Inspection Report 05000461/2023420
RS-23-081, Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation2023-08-21021 August 2023
Request for License Amendment to Revise Technical Specifications Related to Reactor Water Cleanup Isolation Instrumentation
IR 05000461/20230022023-08-0404 August 2023
Integrated Inspection Report 05000461/2023002
RS-23-085, Supplemental Information Related to Request for Partial Site Release2023-08-0303 August 2023
Supplemental Information Related to Request for Partial Site Release
ML23209A8102023-07-28028 July 2023
05000461; Notification of an NRC Biennial Licensed Operator Requalification Program Inspection and Request for Information
ML23198A0152023-07-27027 July 2023
License Renewal Application Public Meeting Summary of Pre-Submittal Meeting
ML23202A0992023-07-24024 July 2023
Notification of NRC Baseline Inspection and Request for Information; Inspection Report 05000461/2023004
ML23200A2592023-07-24024 July 2023
June 27, 2023, Clinton Power Station License Renewal Environmental Pre-application Public Meeting-Meeting Summary
IR 05000461/20234012023-07-19019 July 2023
Cyber Security Inspection Report 05000461/2023401
ML23194A1662023-07-19019 July 2023
Supplemental Information Needed for Acceptance of Requested Licensing Action Request for Partial Site Release
ML23191A8772023-07-11011 July 2023
Operator Licensing Examination Approval Clinton Power Station July 2023
ML23178A2422023-06-28028 June 2023
Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch III
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-23-073, Request for Partial Site Release2023-06-0707 June 2023
Request for Partial Site Release
IR 05000461/20230102023-05-26026 May 2023
Triennial Fire Protection Inspection Report 05000461/2023010
RS-23-042, Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling2023-05-25025 May 2023
Application to Revise Technical Specifications to Adopt TSTF-580, Provide Exception from Entering Mode 4 with No Operable RHR Shutdown Cooling
ML23143A3182023-05-23023 May 2023
Information Meeting (Open House) with a Question and Answer Session to Discuss NRC 2022 End-Of-Cycle Plant Performance Assessment of Clinton Power Station, Unit 1
IR 05000461/20230012023-05-0404 May 2023
Integrated Inspection Report 05000461/2023001
ML23118A3472023-05-0101 May 2023
County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Correction of Amendment No. 193 Adoption of TSTF-306, Revision 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration EPID L-2022-LLA-0143
ML23114A2522023-04-28028 April 2023
Request to Use a Provision of a Later Edition of the ASME Boiler & Pressure Vessel Code, Section XI
ML23081A0382023-04-25025 April 2023
County, 1 & 2; Nine Mile Point, 2; and Quad Cities, 1 & 2 - Issuance of Amendments to Adopt TSTF-306, Rev. 2, Add Action to LCO 3.3.6.1 to Give Option to Isolate the Penetration
ML23110A3202023-04-21021 April 2023
Information Request to Support the NRC Annual Baseline Emergency Action Level and Emergency Plan Changes Inspection
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
ML23061A1632023-03-0303 March 2023
Reassignment of the U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch 3
IR 05000461/20220062023-03-0101 March 2023
Annual Assessment Letter for Clinton Power Station, Unit 1 (Report 05000461/2022006)
RS-23-039, Request for License Amendment to Revise Technical Specifications Section 3.8.3, Diesel Fuel Oil, Lube Oil, and Starting Air2023-03-0101 March 2023
Request for License Amendment to Revise Technical Specifications Section 3.8.3, Diesel Fuel Oil, Lube Oil, and Starting Air
ML23031A2972023-03-0101 March 2023
Issuance of Amendment No. 248 Adoption of TSTF-269, Revision 2
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
ML23039A1852023-02-10010 February 2023
Integrated Inspection Report 05000461/2022004 07201046/2022001
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
IR 05000461/20220112023-01-27027 January 2023
Biennial Problem Identification and Resolution Inspection Report 05000461/2022011
RS-23-002, Application to Adopt TSTF-332, ECCS Response Time Testing2023-01-13013 January 2023
Application to Adopt TSTF-332, ECCS Response Time Testing
ML23005A0682023-01-0505 January 2023
Notification of NRC Fire Protection Team Inspection Request for Information: Inspection Report 05000461/2023010
ML22341A6042022-12-0808 December 2022
Confirmation of Initial License Examination
IR 05000461/20224022022-12-0606 December 2022
Security Baseline Inspection Report 05000461/2022402
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
2024-02-02
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON , D.C. 20555-0001 June 20 , 2016 Mr. Bryan C. Hanson Senior Vice President Exelon Generation Company, LLC President and Chief Nuclear Officer Exelon Nuclear 4300 Winfield Road Warrenville , IL 60555
SUBJECT:
CLINTON POWER STATION , UNIT NO. 1 - STAFF REVIEW OF MITIGATION STRATEGIES ASSESSMENT REPORT OF THE IMPACT OF THE REEVALUATED SEISMIC HAZARD DEVELOPED IN RESPONSE TO THE MARCH 12, 2012 , 50 .54(f) LETTER
Dear Mr. Hanson:
The purpose of this letter is to provide the U.S. Nuclear Regulatory Commission 's (NRC) assessment of the seismic hazard mitigation strategies assessment (MSA) , as described in the May 26, 2016, letter (Agencywide Documents Access and Management System (ADAMS)
Accession No. ML16147A560) , submitted by Exelon Generation Company, LLC, (Exelon , the licensee) for Clinton Power Station , Unit No. 1 (Clinton). The mitigation strategies assessment confirms that the licensee has adequately addressed the reevaluated seismic hazard within its mitigating strategies for beyond-design-basis external events.
BACKGROUND By letter dated March 12, 2012 (ADAMS Accession No. ML12053A340), the NRC issued a request for information pursuant to Title 1O of the Code of Federal Regulations (10 CFR) ,
Section 50.54(f) (hereafter referred to as the 50.54(f) letter) . The 50.54(f) letter was issued as part of implementing lessons-learned from the accident at the Fukushima Dai-ichi nuclear power plant. Enclosure 1 to the 50.54(f) letter requested licensees reevaluate the seismic hazard using present-day methodologies and guidance. Concurrent with the reevaluation of seismic hazards, the NRC issued Order EA-12-049, "Issuance of Order to Modify Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events" (ADAMS Accession No. ML12054A736). The order requires holders of operating power reactor licenses and construction permits issued under 10 CFR Part 50 to develop, implement, and maintain guidance and strategies to maintain or restore core cooling , containment, and spent fuel pool cooling following a beyond-design-basis external event.
By letter dated March 31 , 2014 (ADAMS Accession No. ML14091A011), the licensee provided its reevaluated seismic hazard for Clinton in response to the 50.54(f) letter.
B. Hanson On December 10, 2015 (ADAMS Accession No. ML16005A621), the Nuclear Energy Institute (NEI) submitted Revision 2 to NEI 12-06, including guidance for conducting MSAs using the reevaluated hazard information. The NRC subsequently endorsed NEI 12-06, Revision 2, with exceptions, clarifications , and additions, in Japan Lessons-Learned Division (JLD) interim staff guidance (ISG) JLD-ISG-2012-01 , Revision 1, "Compliance with Order EA-12-049, Order Modifying Licenses with Regard to Requirements for Mitigation Strategies for Beyond-Design-Basis External Events" (ADAMS Accession No. ML15357A163).
MITIGATION STRATEGIES ASSESSMENT By letter dated October 19, 2015 (ADAMS Accession No. ML15281A226), the NRC staff documented its review of the licensee's reevaluated seismic hazard , also referred to as the mitigation strategies seismic hazard information. The staff confirmed the licensee's conclusion that its reevaluated seismic hazard is bounded by the safe shutdown earthquake (SSE) over the 1 to10 Hertz (Hz) frequency range, but exceeds the SSE in a portion of the frequency range above 10 Hz, meriting a high frequency confirmation. In addition, the staff concluded that the Ground Motion Response Spectrum (GMRS) determined by the licensee adequately characterizes the reevaluated seismic hazard for the Clinton site.
By letter dated November 30, 2015 (ADAMS Accession No. ML15335A389), Exelon submitted a High Frequency Confirmation Report for Clinton . By letter dated February 18, 2016 (ADAMS Accession No. ML15364A544), the NRC staff confirmed the Clinton GMRS exceedance above the current design-basis is on the order of 10 percent or less of the area under the SSE curve over the frequency range of exceedance and met the criterion described in Section 3.1.2, "Limited High Frequency Exceedance Screening ," in Electric Power Research Institute (EPRI)
Report 3002004396. The EPRl report concluded, and the staff agreed , that these types of minor exceedances over limited frequency ranges do not represent a significant high frequency concern . Therefore, the methodology used by the licensee is appropriate to disposition the GMRS exceedance above the current design basis.
The licensee stated that the Clinton MSA was performed consistent with NEI 12-06, Revision 2.
Appendix H of NEI 12-06, Revision 2, describes acceptable methods for demonstrating that the reevaluated seismic hazard is addressed within the Clinton mitigation strategies for beyond-design-basis external events. The NRC staff confirmed that the licensee's seismic hazard MSA is consistent with the guidance in Appendix H.4.2 of NEI 12-06, Revision 2, as endorsed , by JLD-ISG-2012-01 , Revision 1. Therefore , the methodology used by the licensee is appropriate to perform an assessment of the mitigation strategies that addresses the reevaluated seismic hazard .
The NRC staff has reviewed the seismic hazard MSA for Clinton . The NRC staff concludes that sufficient information has been provided to demonstrate that the licensee's plans for the development and implementation of guidance and strategies under Order EA-12-049 appropriately address the reevaluated seismic hazard information stemming from the 50.54(f) letter.
B. Hanson If you have any questions, please contact me at (301) 415-3041 or via e-mail at Stephen.Wyman@nrc.gov.
Sincerely, Stephen Wyman , Project Manager Hazards Management Branch Japan Lessons-Learned Division Office of Nuclear Reactor Regulation Docket No. 50-461 cc: Distribution via Listserv
ML16166A121
- via e-mail OFFICE NRR/JLD/JHMB/PM NRR/JLD/LA NRR/JLD/JHMB/PM NAME SWyman Slent BTitus '
DATE 06/14/2016 06/14/2016 06/15/2016' OFFICE NRR/JLD/JHMB/BC(A) NRR/JLD/JHMB/PM NAME GBowman SWyman DATE 06/17/2016 06/20/2016
