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| {{#Wiki_filter:Nuclear Operating CompanySouth Texas Pro/ect Electric Generating Station PO. Box 289 Wadsworth, Texas 77483 -July 7, 2014NOC-AE-14003157 File No.: G251 OCFR50.46 U. S. Nuclear Regulatory Commission Attention: | | {{#Wiki_filter:Nuclear Operating Company South Texas Pro/ect Electric Generating Station PO. Box 289 Wadsworth, Texas 77483 -July 7, 2014 NOC-AE-14003157 File No.: G25 1 OCFR50.46 U. S. Nuclear Regulatory Commission Attention: |
| Document Control DeskWashington, D.C. 20555-0001 South Texas ProjectUnit 1Docket No. STN 50-4981 OCFR50.46 Thirty-Day Report of Siqnificant ECCS Model Chanqes | | Document Control Desk Washington, D.C. 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 1 OCFR50.46 Thirty-Day Report of Siqnificant ECCS Model Chanqes |
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| Letter from R.F. Dunn to NRC Document Control Desk, "10CFR 50.46 ECCSEvaluation Model Significant Change/Error Report," | | Letter from R.F. Dunn to NRC Document Control Desk, "10CFR 50.46 ECCS Evaluation Model Significant Change/Error Report," dated October 17, 2012, NOC-AE-12002912 (ML12310A383) |
| dated October 17, 2012,NOC-AE-12002912 (ML12310A383) | | 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.The value for the hot assembly average rod Gamma Energy Deposition Model for Unit 1 Cycle 19, increased 0.0041 above the analyzed value of 0.984. This resulted in an estimated increase in Peak Clad Temperature (PCT) of 3°F to the value of 2117°F reported in the Reference letter.The new PCT value for Unit 1 Cycle 19 is 2120°F. Since the absolute value of PCT changes to the Analysis of Record exceeds 50'F, the change is considered significant in accordance with 1 OCFR50.46(a)(3)(i). |
| 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 1Emergency Core Cooling Model.The value for the hot assembly average rod Gamma Energy Deposition Model for Unit 1 Cycle19, increased 0.0041 above the analyzed value of 0.984. This resulted in an estimated increasein Peak Clad Temperature (PCT) of 3°F to the value of 2117°F reported in the Reference letter.The new PCT value for Unit 1 Cycle 19 is 2120°F. Since the absolute value of PCT changes tothe Analysis of Record exceeds 50'F, the change is considered significant in accordance with1 OCFR50.46(a)(3)(i). | | No schedule for reanalysis is proposed since the Unit 1 Cycle 19 PCT remains below the 10CFR50.46(b)(1) limit of 2200°F.There are no commitments in this letter.If there are any questions please contact Charlie Albury at (361) 972-8901.Roland F. Dunn Manager Nuclear Fuel and Analysis cra STI: 33897028 NOC-AE-14003157 Page 2 of 2 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Balwant K. Singal Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8 B1)11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MNl 16 Wadsworth, TX 77483 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Balwant K. Singal U. S. Nuclear Regulatory Commission John Ragan Chris O'Hara Jim von Suskil NRG South Texas LP Kevin Polio Cris Eugster L. D. Blaylock CPS Energy Peter Nemeth Crain Caton & James, P.C.C. Mele John Wester City of Austin Richard A. Ratliff Texas Department of State Health Services Robert Free Texas Department of State Health Services}} |
| No schedule for reanalysis is proposed since the Unit 1 Cycle 19 PCT remains below the10CFR50.46(b)(1) limit of 2200°F.There are no commitments in this letter.If there are any questions please contact Charlie Albury at (361) 972-8901. | |
| Roland F. DunnManagerNuclear Fuel and AnalysiscraSTI: 33897028 NOC-AE-14003157 Page 2 of 2cc:(paper copy)(electronic copy)Regional Administrator, Region IVU. S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Balwant K. SingalSenior Project ManagerU.S. Nuclear Regulatory Commission One White Flint North (MS 8 B1)11555 Rockville PikeRockville, MD 20852NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MNl 16Wadsworth, TX 77483A. H. Gutterman, EsquireMorgan, Lewis & Bockius LLPBalwant K. SingalU. S. Nuclear Regulatory Commission John RaganChris O'HaraJim von SuskilNRG South Texas LPKevin PolioCris EugsterL. D. BlaylockCPS EnergyPeter NemethCrain Caton & James, P.C.C. MeleJohn WesterCity of AustinRichard A. RatliffTexas Department of State HealthServicesRobert FreeTexas Department of State HealthServices}} | |
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Category:Letter
MONTHYEARML24250A1882024-09-11011 September 2024 Request for Information for an NRC Post-Approval Site Inspection for License Renewal 05000499/LER-2024-001, Supplement to Automatic Reactor Trip and Actuation of Two of Three Emergency Diesel Generators2024-08-29029 August 2024 Supplement to Automatic Reactor Trip and Actuation of Two of Three Emergency Diesel Generators IR 05000498/20243012024-08-27027 August 2024 NRC Initial Operator Licensing Examination Approval 05000498/2024301; 05000499/2024301 IR 05000498/20240052024-08-22022 August 2024 Updated Inspection Plan for South Texas Project Electric Generating Station, Units 1 and 2 (Report 05000498/2024005 and 05000499/2024005) IR 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 ML24184C0832024-07-0202 July 2024 Automatic Reactor Trip and Actuation of Two of Three Emergency Diesel Generators ML24183A1742024-07-0101 July 2024 Condition Prohibited by Technical Specifications and Potential Loss of Safety Function Due to Inoperable Low Head Safety Injection Pump ML24179A3412024-06-27027 June 2024 Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function ML24171A0112024-06-19019 June 2024 Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function 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 ML24137A0882024-05-15015 May 2024 Operator Licensinq Examination Schedule Revision 3 ML24130A2712024-05-0909 May 2024 Re Two Essential Chilled Water Trains Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function 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 ML24120A3762024-04-29029 April 2024 Annual Dose Report for 2023 NOC-AE-240040, Annual Dose Report for 20232024-04-29029 April 2024 Annual Dose Report for 2023 ML24116A2282024-04-25025 April 2024 Annual Environmental Operating Report ML24116A3032024-04-25025 April 2024 Operations Quality Assurance Plan Condition Adverse to Quality Definition Change Resulting in a Reduction in Commitment ML24116A3172024-04-25025 April 2024 Condition Prohibited by Technical Specifications Due to Inoperable Train of Essential Chilled Water 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 ML24097A0072024-04-0606 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 ML24092A1902024-04-0101 April 2024 Re Two Steam Generator Power Operated Relief Valves (Porvs) Inoperable Resulting in a Condition That Could Have Prevented Fulfillment of a Safety Function NOC-AE-240040, Financial Assurance for Decommissioning - 2024 Update2024-03-28028 March 2024 Financial Assurance for Decommissioning - 2024 Update ML24088A3022024-03-28028 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 ML24066A2002024-03-0606 March 2024 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes 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 ML24022A2252024-02-20020 February 2024 Issuance of Amendment Nos. 227 and 212 to Authorize the Revision of the Alternative Source Term Dose Calculation ML24050A0082024-02-19019 February 2024 Evidence of Financial Protection ML24045A0922024-02-16016 February 2024 Response to STP FOF Move Letter (2024) ML24017A2972024-02-15015 February 2024 Project Manager Assignment ML24039A1602024-02-0808 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 2024-09-11
[Table view] Category:Licensee 30-Day Written Event Report
[Table view] |
Text
Nuclear Operating Company South Texas Pro/ect Electric Generating Station PO. Box 289 Wadsworth, Texas 77483 -July 7, 2014 NOC-AE-14003157 File No.: G25 1 OCFR50.46 U. S. Nuclear Regulatory Commission Attention:
Document Control Desk Washington, D.C. 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 1 OCFR50.46 Thirty-Day Report of Siqnificant ECCS Model Chanqes
Reference:
Letter from R.F. Dunn to NRC Document Control Desk, "10CFR 50.46 ECCS Evaluation Model Significant Change/Error Report," dated October 17, 2012, NOC-AE-12002912 (ML12310A383)
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.The value for the hot assembly average rod Gamma Energy Deposition Model for Unit 1 Cycle 19, increased 0.0041 above the analyzed value of 0.984. This resulted in an estimated increase in Peak Clad Temperature (PCT) of 3°F to the value of 2117°F reported in the Reference letter.The new PCT value for Unit 1 Cycle 19 is 2120°F. Since the absolute value of PCT changes to the Analysis of Record exceeds 50'F, the change is considered significant in accordance with 1 OCFR50.46(a)(3)(i).
No schedule for reanalysis is proposed since the Unit 1 Cycle 19 PCT remains below the 10CFR50.46(b)(1) limit of 2200°F.There are no commitments in this letter.If there are any questions please contact Charlie Albury at (361) 972-8901.Roland F. Dunn Manager Nuclear Fuel and Analysis cra STI: 33897028 NOC-AE-14003157 Page 2 of 2 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Balwant K. Singal Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8 B1)11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MNl 16 Wadsworth, TX 77483 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Balwant K. Singal U. S. Nuclear Regulatory Commission John Ragan Chris O'Hara Jim von Suskil NRG South Texas LP Kevin Polio Cris Eugster L. D. Blaylock CPS Energy Peter Nemeth Crain Caton & James, P.C.C. Mele John Wester City of Austin Richard A. Ratliff Texas Department of State Health Services Robert Free Texas Department of State Health Services