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Category:Letter
MONTHYEARIR 05000498/20240022024-08-0909 August 2024 Integrated Inspection Report 05000498/2024002 and 05000499/2024002 IR 05000498/20240102024-08-0808 August 2024 Biennial Problem Identification and Resolution Inspection Report 05000498/2024010 and 05000499/2024010 NOC-AE-240040, Application for Order Consenting to Direct Transfer of Licenses2024-07-31031 July 2024 Application for Order Consenting to Direct Transfer of Licenses ML24218A1462024-07-26026 July 2024 2. EPA Comments on South Texas Project Exemption Ea/Fonsi ML24207A1782024-07-25025 July 2024 Licensed Operator Positive Fitness-For-Duty Test IR 05000498/20244042024-06-0303 June 2024 Cyber Security Inspection Report 05000498/2024404 (Cover Letter) ML24141A0482024-05-17017 May 2024 EN 56958_1 Ametek Solidstate Controls, Inc ML24136A2842024-05-15015 May 2024 Independent Spent Fuel Storage Installation Supplement to Request for Exemption from Various Part 72 Regulations Resulting from Fuel Basket Design Control Compliance ML24136A2872024-05-15015 May 2024 Submittal of 2024 Nrc/Fema Evaluated Exercise Scenario Manual NOC-AE-240040, Operator Licensinq Examination Schedule Revision 32024-05-15015 May 2024 Operator Licensinq Examination Schedule Revision 3 ML24128A1572024-05-0707 May 2024 Independent Spent Fuel Storage Installation Request for Exemption from Various Part 72 Regulations Resulting from Fuel Basket Design Control Compliance IR 05000498/20240012024-05-0606 May 2024 Integrated Inspection Report 05000498/2024001 & 05000499/2024001 ML24116A3032024-04-25025 April 2024 Operations Quality Assurance Plan Condition Adverse to Quality Definition Change Resulting in a Reduction in Commitment ML24116A2282024-04-25025 April 2024 Annual Environmental Operating Report ML24117A1602024-04-24024 April 2024 2023 Radioactive Effluent Release Report ML24102A2452024-04-23023 April 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0046 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML24113A3122024-04-22022 April 2024 Cycle 24 Core Operating Limits Report NOC-AE-240040, Relief Request Number RR-ENG-4-07 – Request for an Alternative to ASME Code Case N-729-6 for Reactor Vessel Head Penetration 752024-04-0606 April 2024 Relief Request Number RR-ENG-4-07 – Request for an Alternative to ASME Code Case N-729-6 for Reactor Vessel Head Penetration 75 NOC-AE-240040, Financial Assurance for Decommissioning - 2024 Update2024-03-28028 March 2024 Financial Assurance for Decommissioning - 2024 Update ML24081A3972024-03-21021 March 2024 Response to Request for Additional Information for Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML24080A2902024-03-19019 March 2024 Nuclear Liability Certificates of Insurance ML24079A1312024-03-0505 March 2024 Nuclear Insurance Protection ML24060A1742024-02-28028 February 2024 Submittal of Annual Fitness for Duty Performance Report for 2023 IR 05000498/20230062024-02-28028 February 2024 Annual Assessment Letter for South Texas Project Electric Generating Station, Units 1 and 2 (Report 05000498/2023006 and 05000499/2023006) IR 05000498/20240132024-02-27027 February 2024 Design Basis Assurance Inspection (Programs) Commercial Grade Dedication IR 05000498/2024013 and 05000499/2024013 ML24050A0082024-02-19019 February 2024 Evidence of Financial Protection ML24045A0922024-02-16016 February 2024 Response to STP FOF Move Letter (2024) NOC-AE-240040, Unit L & 2, Supplement to Modify the Implementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation2024-02-0808 February 2024 Unit L & 2, Supplement to Modify the Implementation Date for License Amendment Request to Revise Alternate Source Term Dose Calculation ML24039A1112024-02-0808 February 2024 Operator Licensing Examination Schedule Revision 2 ML24038A3342024-02-0707 February 2024 Change to South Texas Project Electric Generating Station (Stepgs) Emergency Plan ML24033A3002024-02-0707 February 2024 Summary of Regulatory Audit Regarding a Proposed Alternative to ASME Code, Section XI Requirements for Containment Building Inspections ML24029A2752024-01-29029 January 2024 Request to Reschedule Evaluated Force-on-Force Drill IR 05000498/20230042024-01-29029 January 2024 Integrated Inspection Report 05000498/2023004 and 05000499/2023004 ML24024A1162024-01-24024 January 2024 STP Unit 2 Request for Information IR 05000498/20230032023-12-28028 December 2023 Acknowledgment of Reply to a Notice of Violation (NRC Inspection Report 05000498/2023003 and 05000499/2023003) ML23360A1692023-12-26026 December 2023 FEMA, Submittal of Radiological Emergency Preparedness Final Report for the South Texas Project Medical Services Drill Evaluated on August 31, 2023 NOC-AE-230040, Supplement to Proposed Alternate Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection (Relief Request RR-ENG-4-06)2023-12-14014 December 2023 Supplement to Proposed Alternate Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection (Relief Request RR-ENG-4-06) NOC-AE-230039, Docket Nos. Stn 50-498, Stn 50-499 - Reply to a Notice of Violation, NRC Inspection Report 05000498/2023003 and 05000499/20230032023-12-12012 December 2023 Docket Nos. Stn 50-498, Stn 50-499 - Reply to a Notice of Violation, NRC Inspection Report 05000498/2023003 and 05000499/2023003 ML23339A1902023-12-0505 December 2023 Update Foreign Ownership, Control, or Influence (FOCI) ML23326A2592023-12-0505 December 2023 Review of the Fall 2022 Steam Generator Tube Inspection Report IR 05000498/20234012023-12-0404 December 2023 Security Baseline Inspection Report 05000498/2023401 and 05000499/2023401 ML23324A0102023-11-16016 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23310A2282023-11-13013 November 2023 Integrated Inspection Report 05000498/2023003 and 05000499/2023003, and Notice of Violation 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 ML23298A0002023-11-0101 November 2023 the Associated Independent Spent Fuel Storage Installation - Issuance of Amendment Nos. 226 and 211 Related to Order Approving Indirect Transfer of Licenses and Conforming License Amendments ML23279A0342023-10-30030 October 2023 Associated Independent Spent Fuel Storage Installation - Order Approving Indirect Transfer of Licenses and Draft Conforming License Amendments (EPID L-2023-LLM-0004) (Letter) ML23303A0782023-10-30030 October 2023 Submittal of Supplemental Information in Response to Order Consenting to License Transfers and Approval of Draft Conforming License Amendments IR 05000498/20234032023-10-26026 October 2023 Material Control and Accounting Program Inspection Report 05000498/2023403 and 05000499/2023403 (Cover Letter) ML23317A1262023-10-12012 October 2023 South. Texas Project Physical Security Plan, Training and Qualification Plan, Safeguards Contingency Plan, and Independent Spent Fuel Storage Installation Security Program Revision 26 ML23279A1382023-10-0505 October 2023 Responses to Requests for Additional Information Related to Application for Order Approving Indirect Transfer of Control of Licenses 2024-08-09
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December 6, 2021 NOC-AE-21003858 10 CFR 50.46 (a)(3)(i) 10 CFR 50.46 (a)(3)(ii)
STI: 35252800 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes
References:
- 1. Letter from M. Page to NRC Document Control Desk, South Texas Project Units 1 & 2 10 CFR 50.46 Annual Report of ECCS Model Revisions, March 4, 2019, NOC-AE-19003627, ML19063D875.
- 2. Letter from D. Roland to NRC Document Control Desk, South Texas Project Unit 1 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes, June 17, 2020, NOC-AE-20003738, ML20169A859.
- 3. Letter from Dennis J. Galvin (NRC) to G.T. Powell, "South Texas Project, Unit 1 -
Issuance of Amendment No. 219 to Revise Technical Specifications to Reduce Safety Injection Accumulators Minimum Pressures (Exigent Circumstances)
(EPID L-2020-LLA-0108)," May 28, 2020, AE-NOC-20003255, ML20141L612.
In accordance with the requirements of 10 CFR 50.46(a)(3)(ii), STP Nuclear Operating Company (STPNOC) is submitting a 30-day report for a significant change in the South Texas Unit 1 Emergency Core Cooling Model.
In Unit 1 Cycle 23, South Texas Project Unit 1 had reduced the Technical Specification minimum accumulator cover gas pressure to 500 psig to mitigate the effects of check valve leakage into the Low Head Safety Injection / Residual Heat Removal Header. This resulted in an estimated 3°F increase in Peak Clad Temperature (PCT) to the previous value of 2123°F as reported in Reference 1 for the limiting Emergency Core Cooling System (ECCS) analysis for the large break loss-of-coolant-accident (LBLOCA). The PCT value for Unit 1 Cycle 23 was 2126°F as stated in References 2 and 3.
For Unit 1 Cycle 24, the check valve leakage issue was remedied and the Technical Specification minimum nitrogen cover-pressure limit of all three Safety Injection Accumulators has been changed back to 590 psig. As a result, the PCT value for Unit 1 Cycle 24 is restored to 2123°F. The sum of the absolute magnitudes of all the individual changes is 93°F as listed in the enclosed table (Delta PCT column). Since the sum of the absolute magnitudes of the PCT changes from the analysis of record for Unit 1 Cycle 23 exceeds 50°F, the change is considered significant in accordance with 10 CFR 50.46(a)(3)(i).
No schedule for reanalysis is proposed since the Unit 1 Cycle 24 PCT remains below the 10 CFR 50.46(b)(1) limit of 2200°F.
NOC-AE-21003858 Page 2 of 2 There are no commitments in this letter.
If there are any questions regarding this information, please contact Tim Hammons at 361-972-7347 or me at 361-972-7806.
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General Manager, Engineering th
Enclosure:
Unit 1 Cycle 24 Westinghouse LOCA Peak Clad Temperature Summary cc:
Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 1600 E. Lamar Boulevard Arlington, TX 76011-4511
Enclosure NOC-AE-21003858 Page 1 of 1 Unit 1 Cycle 24 Westinghouse LOCA Peak Clad Temperature Summary Plant Name: SOUTH TEXAS 1 Utility Name: STPNOC EM: BASH AOR
Description:
Appendix K Large Break Summary Sheet Status Cycle 24 PCT (°F)
ANALYSIS-OF-RECORD 2090 ASSESSMENTS Delta PCT
(°F)
- 1. IMP Database Error Corrections 0
- 2. PAD Version 4.0 Implementation -30
- 3. LOCBART Pellet Volumetric Heat Generation Rate 6
- 4. PWROG TCD Evaluation - Rebaseline of AOR 5
- 5. PWROG TCD Evaluation - Effect of TCD and 0 Assembly Power/Peaking Factor Burndown
- 6. Effect of Containment Purge 6
- 7. Rebaseline of AOR 46 AOR + ASSESSMENTS PCT = 2123 °F