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| | number = ML102700174 | | | number = ML102700174 |
| | issue date = 09/20/2010 | | | issue date = 09/20/2010 |
| | title = South Texas Project, Units 1 and 2, Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01) | | | title = Project, Units 1 and 2, Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01) |
| | author name = Ruvalcaba M | | | author name = Ruvalcaba M |
| | author affiliation = South Texas Project Nuclear Operating Co | | | author affiliation = South Texas Project Nuclear Operating Co |
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MONTHYEARNOC-AE-10002592, Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01)2010-09-20020 September 2010 Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01) Project stage: Request ML1029900292010-10-25025 October 2010 Acceptance Review Email, Relief Request RR-ENG-3-01, RR-ENG-3-02, and RR-ENG-3-03 from ASME Code Requirements for Third 10-Year Inservice Inspection Interval (TAC ME4766-ME4767, ME4764-ME4765, ME4762-ME4763) Project stage: Acceptance Review ML1030103152010-10-28028 October 2010 Request for Additional Information Email, Relief Request RR-ENG-3-01, from ASME Code Requirements for Class 2 Piping for the Third 10-Year Inservice Inspection Interval Project stage: RAI ML1109803472011-04-20020 April 2011 Relief Request RR-ENG-3-01, from ASME Code Requirements for Steam Generator Main Steam Nozzle Non-Destructive Examination, Third 10-Year Inservice Inspection Interval Project stage: Other 2010-10-28
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Category:Letter
MONTHYEARML24029A2752024-01-29029 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 05000498/20244042024-01-18018 January 2024 Information Request for the Cyber-Security Baseline Inspection, Notification to Perform Inspection 05000498/2024404; 05000499/2024404 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 ML23326A2592023-12-0505 December 2023 Review of the Fall 2022 Steam Generator Tube Inspection Report ML23339A1902023-12-0505 December 2023 Update Foreign Ownership, Control, or Influence (FOCI) 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 ML23303A0782023-10-30030 October 2023 Submittal of Supplemental Information in Response to Order Consenting to License Transfers and Approval of Draft 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) 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 ML23271A1942023-10-0303 October 2023 Notification of Commercial Grade Dedication Inspection (05000498/2024013 and 05000499/2024013) and Request for Information ML23270B2592023-09-27027 September 2023 Update Foreign Ownership, Control, or Influence ML23263B1132023-09-20020 September 2023 Operator Licensing Examination Schedule Revision 1 IR 05000498/20243012023-09-0707 September 2023 Notification of NRC Initial Operator Licensing Examination 05000498/2024301; 05000499/2024301 IR 05000498/20233012023-09-0101 September 2023 NRC Examination Report 05000498/2023301 and 05000499/2023301 ML23243B0562023-08-31031 August 2023 Supplemental Information to Application for Order Approving Indirect Transfer of Control of Licenses ML23236A6042023-08-24024 August 2023 Annual Dose Report for 2022 IR 05000498/20230052023-08-22022 August 2023 Updated Inspection Plan for South Texas Project Electric Generating Station, Units 1 and 2 (Report 05000498/2023005 and 05000499/2023005) - Mid Cycle Letter ML23229A5262023-08-17017 August 2023 Inservice Inspection Summary Report - 1 RE24, ML23229A5892023-08-17017 August 2023 Voluntary Response to Regulatory Issue Summary (RIS) 2023-02, Scheduling Information for the Licensing of Accident Tolerant, Increased Enrichment, and Higher Burnup Fuels ML23229A4992023-08-17017 August 2023 Supplement to Proposed Alternate Frequency to Containment Unbonded Post-Tensioning System Inservice Inspection (Relief Request RR-ENG-4-06) ML23228A2102023-08-15015 August 2023 Closure of Investigation (OI 4-22-19) ML23222A0322023-08-10010 August 2023 Report of Changes Made to Quality Assurance Program for Radioactive Material Packages ML23221A3002023-08-0909 August 2023 RE22 Inspection Summary Report for Steam Generator Tubinq, Rev. 1 (Epld L-2023-LRO-0029) ML23222A2792023-08-0909 August 2023 Submittal of Update Foreign Ownership, Control, or Influence (FOCI) IR 05000498/20230022023-07-28028 July 2023 Integrated Inspection Report 05000498/2023002 and 05000499/2023002 ML23198A0532023-07-24024 July 2023 Request for Withholding Information from Public Disclosure ML23188A1612023-07-14014 July 2023 the Associated ISFSI - Notice of Consideration of Approval of Indirect Transfer of Licenses and Conforming Amendments and Opportunity to Request a Hearing (EPID L-2023-LLM-0004) - Letter ML23193A9932023-07-11011 July 2023 Submittal of Update Foreign Ownership, Control or Influence (FOCI) ML23192A0482023-07-11011 July 2023 NRC Initial Operator Licensing Examination Approval 05000498/2023301; 05000499/2023301 NOC-AE-230039, Submittal of Update Foreign Ownership, Control or Influence (FOCI)2023-07-11011 July 2023 Submittal of Update Foreign Ownership, Control or Influence (FOCI) ML23180A2822023-06-29029 June 2023 Operator Licensing Examination Schedule ML23177A2522023-06-26026 June 2023 Units 1, 2 & Independent Spent Fuel Storage Installation - Biennial Submittal of Technical Specification Bases Changes, Commitment Changes, 10 CFR 50.59 Evaluation Summary, and 10 CFR 72.48 Evaluation Summary ML23166B0802023-06-14014 June 2023 Update Foreign Ownership, Control, or Influence (FOCI) ML23163A1762023-06-12012 June 2023 Application for Order Approving Indirect Transfer of Control of Licenses 2024-01-29
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Nuclear Operating Company South Texas Promect Electric Generat'n Station P.. Box 289 Wadsworth, Texas 77483 September 20, 2010 NOC-AE-10002592 File No.: G25 10 CFR 50.55a U. S. Nuclear Regulatory Commission Attention:
Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2746 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01)
In accordance with the provisions of 10 CFR 50.55a(g)(6)(i), the STP Nuclear Operating Company (STPNOC) requests relief from the ASME Section Xl code nondestructive examination requirements applicable to the South Texas Project steam generator main steam nozzle inside-radius sections.
Due to their flow restrictor-type design, the South Texas Project steam generator main steam nozzles do not contain a high-stress inside-radius section for which the Section Xl volumetric examination is intended.
Therefore, compliance with the Section Xl examination requirement is impractical.
There are no commitments in this correspondence.
STPNOC requests NRC review and approval of this relief request by March 1, 2011, to support implementation of the Unit 1 and Unit 2 Ten Year Inservice Inspection Plan for the third inspection interval.If-there are any questions, please contact either Mr. Philip Walker at 361-972-8392 or me at 361-972-7904.
/Marc~o Ruai Manager, Test and Programs Engineering PLW
Attachment:
Request for Relief from ASME Section Xl Code Requirements for Steam Generator Nozzle Non-Destructive Examination (Relief Request RR-ENG-3-01)
STI: 32733139 NOC-AE-1 0002592 Page 2 of 2 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 612 East Lamar Blvd., Suite 4004 Arlington, TX 76011-4125 Mohan C. Thadani Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8 G14)11555 Rockville Pike Rockville, MD 20852 Senior Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN1 16 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 A. H. Gutterman, Esq.Morgan, Lewis & Bockius LLP Mohan C. Thadani U. S. Nuclear Regulatory Commission Peter Nemeth Crain Caton & James, P.C.C. Mele City of Austin E. Alarcon K. Polio Richard Pena.City Public Service Board John Ragan C. Callaway, Esq.J. von Suskil NRG South Texas LP Richard A. Ratliff Alice Rogers Texas Department of State Health Services Attachment 1 NOC-AE-1 0002592 Page 1 of 2 SOUTH TEXAS PROJECT UNITS 1 AND 2 REQUEST FOR RELIEF FROM ASME SECTION Xl CODE REQUIREMENTS FOR STEAM GENERATOR NOZZLE NON-DESTRUCTIVE EXAMINATION (RELIEF REQUEST RR-ENG-3-01)
A. Components Affected (a) Component:
Steam generator (b)
Description:
Main steam nozzle, inside-radius section (c) Class: ASME Code Class 2 B. Applicable Code Requirement The applicable code is ASME Section Xl, 2004 Edition (no addenda).ASME Section Xl, Table IWC-2500-1, Code Category C-B, Item Number C2.22, requires that a volumetric examination of the inside-radius section of nozzles at terminal ends of piping runs be performed in accordance with Figure IWC-2500-4(a), (b), or (d) each inspection interval.
The applicable nozzles include those welded to or integrally cast in vessels that connect to piping runs selected for examination under Examination Category C-F, excluding manways and handholes.
C. Basis for Relief from Code Requirements In accordance with the provisions of 10CFR50.55a(g)(5)(iii), the STP Nuclear Operating Company (STPNOC) requests relief from the Section XI code requirement for a volumetric examination of the inside-radius section of the Unit 1 and 2 steam generator main steam nozzles because compliance with the requirement is impractical.
D. Alternative Examination:
No alternative examination is proposed in lieu of the volumetric examination for which relief is requested.
E. Justification for Granting Relief The inside-radius section of main steam nozzles is considered susceptible to flaw initiation and growth due to the high thermal and mechanical stresses associated with the vessel and connected piping systems. Each South Texas Project steam generator main steam nozzle is a one-piece forging with a set of seven holes bored parallel to the nozzle centerline.
The design does not correspond to Figure Nos. IWC-2500-4(a), (b), or (d) and does not have a"radius bend". Furthermore, the borehole orientation precludes a meaningful ultrasonic examination in the area of the inner radius. Because of this design configuration, the examination required by Section Xl would not provide any meaningful results. In addition, because the ligaments between the holes distribute the stresses throughout the nozzle forging, the South Texas Project steam generator main steam nozzles have no high-stress inside-radius section.
Attachment NOC-AE-10002592 Page 2 of 2 These design considerations make the code-required inservice inspection impractical for application at the South Texas Project.F. Implementation Schedule STPNOC requests relief from ASME Section Xl nondestructive examination requirements for the steam generator main steam nozzle inside radius sections for the duration of the third ten-year inservice inspection interval of Units 1 and 2. The Nuclear Regulatory Commission is requested to review and approve this relief request by March 1, 2011, to support implementation of the Unit 1 and Unit 2 Ten Year Inservice Inspection Plan for the third interval.G. Precedent Relief from this examination requirement was previously approved by the NRC for the South Texas Project second 10-year interval inservice inspection program by safety evaluation dated December 15, 1999 (ML993570106) for Relief Request RR-ENG-2-2.