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MONTHYEARML0921500282009-07-28028 July 2009 Fourth Ten Year Inservice Inspection Interval Request for Relief No. 09-ON-005 Project stage: Request ML1006006982010-03-0303 March 2010 Relief, Request 09 ON-005 for Reactor Vessel Core Flood Nozzle Weld Examinations (ME1846, ME1847, and ME1848) Project stage: Other 2009-07-28
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Category:Code Relief or Alternative
MONTHYEARML23256A0882023-09-25025 September 2023 Issuance of Alternative to Steam Generator Welds ML23151A3482023-05-30030 May 2023 Duke Fleet - Request for Additional Information Proposed Alternative for Pressurizer Welds in Accordance with 10 CFR 50.55a(z)(1) ML23118A0762023-05-0101 May 2023 Approval for Use of Specific Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI RA-22-0257, Proposed Alternative for Pressurizer Welds in Accordance with 10 CFR 50.55a(z)(1)2023-02-17017 February 2023 Proposed Alternative for Pressurizer Welds in Accordance with 10 CFR 50.55a(z)(1) ML22096A0032022-11-18018 November 2022 McGuire Nuclear Station and Shearon Harris Nuclear Power Plant Authorization of RA-19-0352 Regarding Use of Alternative for RPV Head Closure Stud Examinations ML22046A2802022-02-23023 February 2022 Relief from ASME Code Paragraph ISTP-3540(b) Related to High Pressure Injection Pumps Vibration Measurements ML22046A2452022-02-18018 February 2022 Regarding Alternative to Implement Code Case OMN-22, Smooth Running Pumps ML22028A3652022-02-0707 February 2022 Authorization and Safety Evaluation for Alternative Acceptance Criteria for Code Case N-853 ML21029A3352021-02-16016 February 2021 Request to Use a Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI RA-20-0036, Request for Alternative to Defect Removal Prior to Performing Repair/Replacement Activities on Low Pressure Service Water (LPSW) System Piping2020-03-0202 March 2020 Request for Alternative to Defect Removal Prior to Performing Repair/Replacement Activities on Low Pressure Service Water (LPSW) System Piping ML20042D7142020-02-13013 February 2020 Relief Request 19-ON-002 for Proposed Alternative to Reactor Vessel Nozzle Weld Examination Frequency Requirements in ASME Code Case N-770-2 RA-19-0028, Submittal of Relief Request (19-ON-001) to Utilize Code Case N-853, PWR Class 1 Primary Piping Alloy 600 Full Penetration Branch Connection Weld Metal Buildup for Material Susceptible to Primary Water Stress2019-03-21021 March 2019 Submittal of Relief Request (19-ON-001) to Utilize Code Case N-853, PWR Class 1 Primary Piping Alloy 600 Full Penetration Branch Connection Weld Metal Buildup for Material Susceptible to Primary Water Stress RA-19-0026, Response to Request for Additional Information (RAI) Regarding Proposed Alternative to the Depth Sizing Qualification Requirement of Appendix Viii, Supplements 2 and 10 (18-GO-001)2019-02-11011 February 2019 Response to Request for Additional Information (RAI) Regarding Proposed Alternative to the Depth Sizing Qualification Requirement of Appendix Viii, Supplements 2 and 10 (18-GO-001) RA-18-0180, Supplement to Relief Request for an Alternative to the Depth Sizing Qualification Requirement of Appendix Viii, Supplements 22018-11-12012 November 2018 Supplement to Relief Request for an Alternative to the Depth Sizing Qualification Requirement of Appendix Viii, Supplements 2 ML17331A0862017-12-26026 December 2017 Alternative to Inservice Inspection Regarding Reactor Pressure Vessel Threads ML16118A2302016-04-30030 April 2016 Relief Request 14-ON-022 Alternative Requirements for Class 2 Residual Heat Removal Heat Exchange Welds ML16053A5012016-03-0101 March 2016 Relief Request ON-GRR-01 Grace Period for OM Code Frequencies (CAC Nos. MF7130, MF7131, and MF7132) ML16004A1812016-01-0707 January 2016 Relief Request 14-ON-003 Alternative Requirements for Class 1 Category B-J Piping Welds ML16004A2622016-01-0707 January 2016 Relief Request 15-ON-004: Limited Visual Examinations of the Reactor Pressure Vessel Support Skirt for the Fourth 10-Year Inservice Inspection Interval Program ML15349A4532015-12-29029 December 2015 Relief Request 15-ON-001 Repair of Low Pressure Service Water System Piping ONS-2015-087, Fourth Ten-Year Inservice Inspection Plan, Relief Request No. 15-ON-003, Limited Volume Inspections from 3EOC27 Outage2015-07-15015 July 2015 Fourth Ten-Year Inservice Inspection Plan, Relief Request No. 15-ON-003, Limited Volume Inspections from 3EOC27 Outage ONS-2015-088, Fourth Ten-Year Inservice Inspection Plan, Relief Request No. 15-ON-004, Limited Visual Examinations from 1 EOC27, 2EOC26 and 3EOC27 Outages2015-07-15015 July 2015 Fourth Ten-Year Inservice Inspection Plan, Relief Request No. 15-ON-004, Limited Visual Examinations from 1 EOC27, 2EOC26 and 3EOC27 Outages ML13365A0232014-01-17017 January 2014 Relief from the Requirements of the ASME Code for Fourth 10-Year Interval Inspection Program Request for Relief ML13066A1002013-02-27027 February 2013 End of Cycle (EOC) 27 Refueling Outage Steam Generator Inservice Inspection Report ML13045A2902013-02-15015 February 2013 Relief from the Requirements of the ASME OM Code ML13038A1522013-01-31031 January 2013 Fourth Ten-Year Inservice Inspection Plan, Request for Relief No. 12-ON-001 ML13038A1502013-01-31031 January 2013 Fourth Ten-Year Inservice Inspection Plan Request for Relief No. 12-ON-002 ML12173A3122012-06-18018 June 2012 Approval Request for the Fifth Ten-Year Inservice Test Program Interval Pump Specific Code Relief Request No. ON-SRP-HPI-03 ML12030A0892012-01-23023 January 2012 Duke Energy Carolinas - Relief Request Serial #09-GO-001 Request for NRC Clarification ML11143A0592011-06-21021 June 2011 Relief Request 10-ON-001 for Reactor Vessel Core Flood Nozzle Weld Examinations ML1106605882011-03-28028 March 2011 Relief Request (RR) Proposed Alternative for Certain Vibration Measurement Requirements RR (ON-SRP-HPI-03)) (TAC Nos. Me 3840, ME3841, ME3842, ME5790, ME5791, ME5792, ME5793, ME5794 and ME5795) ML1016604732010-06-0909 June 2010 Relief Request No. 10-ON-001, Alternative to Volumetric Examination Requirements for the Residual Heat Removal (RHR) Heat Exchanger Class 2 Nozzle-to-Shell Welds ML1008802862010-03-31031 March 2010 Relief Request 09-ON-003 for the Use of Full Structural Weld Overlay & Alternative Examination Techniques, for the Letdown Line, Reactor Vessel Core Flood & Reactor Coolant Pump Inlet & Outlet Nozzle Butt Welds. ML1006006982010-03-0303 March 2010 Relief, Request 09 ON-005 for Reactor Vessel Core Flood Nozzle Weld Examinations (ME1846, ME1847, and ME1848) ML0927403122009-09-24024 September 2009 Relief Request from Immediate ASME Code Flaw Repair of Standby Shutdown Facility Auxiliary Service Water Piping ML0921500282009-07-28028 July 2009 Fourth Ten Year Inservice Inspection Interval Request for Relief No. 09-ON-005 ML0914702652009-05-20020 May 2009 Request for Extension of Duke Response Time to Referenced Letter ML0908307262009-03-20020 March 2009 Fourth Ten Year Inservice Inspection Interval, Request for Relief No. 09-ON-003 ML0833600322008-11-20020 November 2008 Summary Ultrasonic Examination Results of Completed ML0810200532008-04-0707 April 2008 Relief Request No. 08-ON-003, from Immediate ASME Code Flaw Repair of Low Pressure Service Water Piping ML0734600272008-01-17017 January 2008 Relief Request to Use Preemptive Weld Overlay and Alternative Examination Techniques on Decay Heat Removal Line to Hotleg Nozzle Welds ML0715605102007-05-29029 May 2007 Fourth Ten Year Inservice Inspection Interval Request for Relief No. 04-ON-007, Revision 1 ML0712300902007-04-27027 April 2007 Part 21 Interim Report, Dresser Investigation File No. 2007-02, Interim Reporting of a Potential Defect Involving Power Actuated Pressure Relief Valves Supplied to Calvert Cliffs, Fort Calhoun and Oconee Plants ML0626202342006-09-11011 September 2006 Relief Request 06-ON-004 Request for Additional Information ML0622902642006-08-0909 August 2006 Response to Request for Additional Information Request for Relief No. 05-ON-004 ML0619400162006-07-0606 July 2006 Replacement of Steam Generators Request for Relief No. 04-ON-007, Rev. 1 ML0609302482006-05-0404 May 2006 Relief Request 05-ON-003 ML0608302912006-04-17017 April 2006 Relief, Volumetric Examination of Essentially 100 Percent of the Volume as Required by the ASME, Boiler and Pressure Vessel Code, Section XI, for Class 1 and 2 Welds ML0608301052006-04-14014 April 2006 SE MC5483 and MC5483, Relief Request RR-04-ON-013 ML0536302312006-03-13013 March 2006 Relief Request MC8852, Repair of Steam Generator Tubes 2023-09-25
[Table view] Category:Letter
MONTHYEARIR 05000269/20243012024-08-0808 August 2024 – Operator Licensing Examination Approval 05000269/2024301, 05000270/2024301, and 05000287/2024301 IR 05000269/20240102024-08-0101 August 2024 Focused Engineering Inspection - Age-Related Degradation Report 05000269/2024010 and 05000270/2024010 and 05000287/2024010 IR 05000269/20240022024-07-25025 July 2024 Integrated Inspection Report 05000269/2024002 and 05000270/2024002 and 05000287/2024002 ML24192A1312024-07-15015 July 2024 Licensed Operator Positive Fitness-For-Duty Test ML24183A0972024-07-12012 July 2024 ISFSI; Catawba 1, 2 & ISFSI; McGuire 1, 2 & ISFSI; Oconee 1, 2, 3 & ISFSI; Shearon Harris 1; H. B. Robinson 2 & ISFSI; and Radioactive Package Shipping Under 10 CFR 71 (71-266 & 71-345) – Review of QA Program Changes EPID L-2024-LLQ-0002 ML24183A2352024-06-29029 June 2024 Update 3 to Interim Report Regarding a Potential Defect with Schneider Electric Medium Voltage Vr Type Circuit Breaker Part Number V5D4133Y000 ML24141A0482024-05-17017 May 2024 EN 56958_1 Ametek Solidstate Controls, Inc IR 05000269/20240012024-05-0303 May 2024 Integrated Inspection Report 05000269/2024001, 05000270/2024001 and 05000287/2024001 IR 05000269/20244022024-04-24024 April 2024 Security Baseline Inspection Report 05000269/2024402 and 05000270/2024402 and 05000287/2024402 ML24108A0792024-04-16016 April 2024 EN 57079 Paragon Energy Solutions Email Forwarding Part 21 Interim Report Re Potential Defect with Schneider Electric Medium Voltage Vr Type Circuit Breaker Part Number V5D4133Y000 ML23304A1422024-02-0101 February 2024 Issuance of Environmental Scoping Summary Report Associated with the U.S. Nuclear Regulatory Commission Staffs Review of the Oconee Nuclear Station, Units 1, 2, & 3, Subsequent License Renewal Application ML24005A2492024-01-24024 January 2024 Exemption from Select Requirements of 10 CFR Part 73 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting) ML23331A7982023-12-14014 December 2023 Review of the Fall 2022 Steam Generator Tube Inspection Report (01R32) ML23262A9672023-12-13013 December 2023 Alternative to Use RR-22-0174, Risk-Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 and 3 Systems Section XI, Division 1 ML23317A3462023-11-14014 November 2023 Duke Fleet - Correction Letter to License Amendment Nos. 312 & 340 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000269/20230032023-11-14014 November 2023 Integrated Inspection Report 05000269/2023003, 05000270/2023003, and 05000287/2023003; and IR 07200040/2023001; and Exercise of Enforcement Discretion ML23219A1402023-10-10010 October 2023 Audit Report Proposed Alternative to Use ASME Code Case N-752, Risk Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 and 3 Systems XI, Division 1 ML23269A1102023-10-0606 October 2023 Letter to Steven Snider-Revised Schedule for the Environmental Review of the Oconee Nuclear Station, Unit 1, 2, and 3, Subsequent License Renewal Application ML23256A0882023-09-25025 September 2023 Issuance of Alternative to Steam Generator Welds ML23195A0782023-08-29029 August 2023 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-554, Revision 1 IR 05000269/20230052023-08-25025 August 2023 Updated Inspection Plan for Oconee Nuclear Station Units 1, 2 and 3 (Report 05000269/2023005, 05000270/2023005, and 05000287/2023005) IR 05000269/20230112023-08-25025 August 2023 Comprehensive Engineering Team Inspection Report 05000269/2023011 and 05000270/2023011 and 05000287/2023011 IR 05000269/20230022023-07-28028 July 2023 Integrated Inspection Report 05000269/2023002, 05000270/2023002 and 05000287/2023002 ML23208A0972023-07-27027 July 2023 Subsequent License Renewal List of Threatened and Endangered Species That May Occur in Your Proposed Project Location or May Be Affected IR 05000269/20230102023-07-19019 July 2023 Biennial Problem Identification and Resolution Inspection Report 05000269/2023010 and 05000270/2023010 and 05000287/2023010 and Notice of Violation ML23178A0682023-07-0303 July 2023 Audit Plan Proposed Alternative to Use ASME Code Case N-752, Risk-Informed Categorization and Treatment for Repair/Replacement Activities in Class 2 & 3 Systems Section XI, Division 1 ML23132A2392023-06-0101 June 2023 Summary of the April 2023 Remote Environmental Audit Related to the Review of the Subsequent License Renewal Application ML23144A0192023-05-25025 May 2023 Review of the Spring 2022 Steam Generator Tube Inspection Report (O3R31) IR 05000269/20230012023-05-12012 May 2023 Integrated Inspection Report 05000269/2023001 and 05000270/2023001 and 05000287/2023001 ML23121A0552023-05-0303 May 2023 Acknowledgement of Withdrawal Request to Revise TS 5.5.2 Containment Leakage Rate Testing Program ML23118A0762023-05-0101 May 2023 Approval for Use of Specific Provision of a Later Edition of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, Section XI ML23117A0432023-04-20020 April 2023 Framatome, Inc., Part 21 Notification of Existence of a Defect ML23075A0732023-04-0505 April 2023 License Renewal Regulatory Audit Regarding the Environmental Review of the Subsequent License Renewal Application Supplement (EPID Number L-2021-SLE-0002) ML23045A1432023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - State Tribe Letter ML23045A1332023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - Achp Letter ML23045A1402023-03-15015 March 2023 Request for Scoping Comments Concerning the Supplemental Environmental Review of Oconee Nuclear Station, Units 1, 2, and 3, Subsequent License Renewal Application - Shpo Letter ML22332A4932023-03-10010 March 2023 William States Lee III 1 and 2 - Issuance of Amendments Regarding the Relocation of the Emergency Operations Facility ML23069A1102023-03-10010 March 2023 Notification of Inspection and Request for Information for NRC Problem Identification and Resolution Inspection ML23061A1772023-03-0303 March 2023 Notification of Oconee Nuclear Station Comprehensive Engineering Team Inspection - NRC Inspection Report 05000269/2023011, 05000270/2023011 and 05000287/2023011 IR 05000269/20220062023-03-0101 March 2023 Annual Assessment Letter for Oconee Nuclear Nuclear Station, Units 1, 2 and 3 (NRC Inspection Report 05000269/2022006, 05000270/2022006, and 05000287/2022006) ML23039A1632023-02-0808 February 2023 Requalification Program Inspection ML23037A0772023-02-0606 February 2023 402 Cyber Notification and RFI Letter Final IR 05000269/20220042023-02-0202 February 2023 Integrated Inspection Report 05000269 2022004 and 05000270/2022004 and 05000287/2022004 ML22363A3942023-01-12012 January 2023 Subsequent License Renewal Environmental Report Supplement - Proposed Review Schedule ML22356A0512022-12-14014 December 2022 Curtiss-Wright Nuclear Division, Letter Regarding Potential Efect in a Configuration of the 11/2 Inch Quick Disconnect Connector Cable Assemblies Supplied to Duke Energy (See Attached Spreadsheet) for a Total of 460 of Connectors Only Suppl ML22321A0492022-12-0808 December 2022 Issuance of Amendment Nos. 426, 428 and 427, Additional Mode Change Limitations Applicable to the Adoption of TSTF- 359, Revision 9, Increase Flexibility in Mode Restraints ML22329A1042022-11-29029 November 2022 Review of the Fall 2021 Steam Generator Tube Inspection Report ML22321A1582022-11-22022 November 2022 Summary of Conference Call Regarding the Fall 2022 Steam Generator Tube Inspections ML22096A0032022-11-18018 November 2022 McGuire Nuclear Station and Shearon Harris Nuclear Power Plant Authorization of RA-19-0352 Regarding Use of Alternative for RPV Head Closure Stud Examinations ML22256A2532022-11-14014 November 2022 Issuance of Amendments Regarding the Adoption of Technical Specifications Task Force Traveler TSTF-541, Rev. 2 2024-08-08
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,I Duke BAXTER Vice President Energy Oconee Nuclear Station Duke Energy ON01 VP / 7800 Rochester Highway Seneca, SC 29672 July 28, 2009 864-873-4460 864-873-4208 fax dabaxter@dukeenergy.com U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001
Subject:
Duke Energy Carolinas, LLC Oconee Nuclear Station, Units 1, 2, and 3 Docket No: 50-269, 50-270, 50-287 Fourth Ten Year Inservice Inspection Interval Request for Relief No. 09-ON-005 Pursuant to 10 CFR 50.55a(a)(3)(i), attached is a Request for Relief to use an alternative to the examination requirements of American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code),Section XI.
The attached Request for Relief 09-ON-005 supports Duke Energy's examination of the reactor vessel core flood nozzles on Units 1, 2, and 3. This alternative will provide an acceptable level of quality and safety.
This relief is needed to support the Oconee Unit 1 fall 2009 refueling outage (1EOC25) scheduled to start October 10, 2009. Therefore, exigent review to support subsequent scheduled examinations is requested. This relief is also intended to apply to Oconee Units 2 and 3, which are scheduled for outages in 2010.
The late submittal of this Relief Request occurred due to the change in Duke Energy's strategy to inspect the cold leg temperature locations rather than to mitigate. This decision caused significant changes in procurement specifications, contract proposals, and contract negotiations, which further delayed this Relief Request. A similar alternative request was approved for McGuire Nuclear Station, Unit 1 in an NRC letter dated May 13, 2009 (ADAMS Accession No. ML091140066).
Therefore, Duke Energy requests that the NRC grant relief as authorized under 10 CFR 50.55a(g)(6)(i).
44-c7 www. duke-energy.com
U. S. Nuclear Regulatory Commission July 28, 2009 Page 2 If there are any questions or further information is needed you may contact Corey Gray at (864) 873-6325, Sincerely, Dave axter, Site ice President
U. S. Nuclear Regulatory Commission July 28, 2009 Page 3 xc w/att: Luis Reyes Region II Administrator U.S. Nuclear Regulatory Commission Atlanta Federal Center 61 Forsyth St., SWW, Suite 23T85 Atlanta, GA 30303 John Stang Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, DC 20555-0001 xc(w/o attch):
Eric Riggs Senior NRC Resident Inspector (acting)
Oconee Nuclear Station Susan Jenkins, Section Manager Division of Waste Management Bureau of Land and Waste Management SC Dept. of Health & Environmental Control 2600 Bull St.
Columbia, SC 29201
Li Attachment 1 Oconee Units 1, 2, and 3 Relief Request for Alternate Depth Sizing Criteria
20004-015 (09/30/2008)
AREVA AREVA NP Inc.,
an AREVA and Siemens company Engineering Information Record Document No: 51 - 9112500 - 000 Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds Page 1 of 8
A 20004-015 (09/30/2008)
AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds Safety Related? EI- YES r* NO Does this document contain assumptions requiring verification? L-- YES M NO Signature Block Pages/Sections Name and P/LP, R/LR, Prepared/Reviewed/
Title/Discipline Signature A/A-CRF Date Approved or Comments M. G. Hacker P 5/26/09 All M. W. Key R 5/26/09 All A. Richmond A 5/26109 All Note: P/LP designates Preparer (P), Lead Preparer (LP)
R/LR designates Reviewer (R), Lead Reviewer (LR)
A/A-CRF designates Approver (A), Approver of Customer Requested Format (A-CRF)
Page 2
A 20004-015 (09/30/2008)
AREVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds Record of Revision Revision Pages/Sections/
No. Date Paragraphs Changed Brief Description /Change Authorization 000 5/26/09 All Initial Release
____ J ____ J________ I_______________
Page 3
A AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds ALTERNATIVE DEPTH SIZING CRITERIA Duke Energy Oconee Units 1, 2, and 3 Page 4
A AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds ALTERNATIVE DEPTH SIZING CRITERIA ProposedAlternative In Accordance with 10 CFR 50.55a(a)(3)(i)
-Alternative ProvidesAcceptable Level of Quality and Safety -
Background
Duke Energy is submitting a request for the use of an alternative to the examination requirements of American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code),Section XI, at Oconee Nuclear Station (ONS) Units 1, 2, and 3. This request supports the examination of reactor vessel core flood nozzle to safe-end (dissimilar metal) welds performed from the inside surface during the next scheduled outage at each unit. Duke Energy has determined the proposed alternative provides an acceptable level of quality and safety, consistent with 10 CFR 50.55a(a)(3)(i).
1.0 Applicable Code Edition and Addenda ONS Units 1, 2, and 3 are currently in the fourth 10-year ISI interval. Applicable dates for each unit are as follows:
ONS1 interval start date 1/1/2004, end date 7/14/2013 ONS2 interval start date 9/9/2004, end date 9/8/2014 ONS3 interval start date 1/2/2005, end date 12/15/2014 The ASME Code of record for the current period of the fourth 10-year ISI interval is the 1998 Edition of Section XI, 2000 addendum.
In addition,Section XI Code Case N-695 (Qualification Requirements for Dissimilar Metal Piping Welds) is referenced in the ISI plan. This Code Case is listed in Reg. Guide 1.147, Rev. 15, Table 1- "Acceptable Section XI Code Cases".
2.0 Applicable Code Requirement ASME Section XI, Table IWB-2500-1, Category B-F, Item B5.10, Reactor Vessel Nozzle to Safe-end Butt Welds, specifies volumetric examination for the dissimilar metal welds. The volumetric examinations are to be conducted in accordance with ASME Section XI, Appendix VIII, Supplement 10, 1998 Edition with 2000 Addenda. Code Case N-695 is an acceptable alternative to Appendix VIII, Supplement 10.
The specific Code Case requirements for which relief is requested pertains to depth sizing qualification requirements for performance demonstration of ultrasonic examination systems for dissimilar metal piping welds as listed below. These same requirements exist in ASME Section XI, 1995 Edition with 1996 Addenda and later editions.
Page 5
A AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds 0 Code Case N-695 3.3 Depth-Sizing test:
"(c) Examination procedures, equipment, and personnel are qualified for depth-sizing when the RMS error of the flaw depth measurements, as compared to the true flaw depths, do not exceed 0.125 in. (3 mm)."
3.0 Alternative Duke Energy proposes to use the Supplement 10 demonstrated value of 0.224 in. for dissimilar metal welds instead of the 0.125 in. value specified for depth sizing. In the event an indication is detected that requires depth sizing, the difference between the required root mean square (RMS) error and the demonstrated RMS error (0.099 in.) will be added to the measured through-wall extent for comparison with applicable acceptance criteria. If the examination vendor demonstrates an improved depth sizing RMS error prior to the examination, the excess of that improved RMS error over the 0.125 in. RMS error requirement, if any, will be added to the measured value for comparison with applicable acceptance criteria.
Consequently, Duke Energy proposes to use an alternative through-wall depth sizing criteria for dissimilar metal welds that are examined from the inside surface. Examinations of these components will be performed during the next scheduled refueling outages at ONS. The outages are scheduled as follows:
ONS-1: 10/2009 ONS-2: 4/2010 ONS-3: 10/2010 4.0 Basis for Relief To date, although qualified for detection and length sizing on these welds, the examination vendors have not met the established RMS error requirement for depth sizing (0.125 in.) when examining from the ID. Duke Energy's examination vendor has demonstrated ability to meet the depth sizing qualification requirement with an RMS error of 0.224 in. instead of the required 0.125 in.. The Electric Power Research Institute (EPRI) has published under their Policy/Procedure Directives the criteria of error in the RMS which has utility approval.
Duke Energy has determined that the alternative in this request will result in an acceptable level of quality and safety, pursuant to the provisions of 10 CFR 50.55a(a)(3)(i). The proposed alternative assures that the subject welds will be fully examined by procedures, personnel and equipment qualified by demonstration in all aspects except depth sizing. For depth sizing, the proposed addition of the difference between the qualified and demonstrated sizing tolerance to any flaw that is required to be sized compensates for the potential variation and assures an acceptable level of quality and safety.
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A AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds
5.0 ASME Code Components Affected
Category and System Details:
Code Class: Class 1 System Welds: Reactor Coolant System Examination Categories:
Category B-F for dissimilar metal welds to reactor vessel nozzle Code Item Numbers:
B 5.10 for dissimilar metal welds to reactor vessel nozzle ONS~. Description Sz MWl Nme omn Unit~ MWl une~~. omn~.
12.25" RV Core Nominal 12.25"ID 1-RPV-WR53 LAS nozzle/Alloy 82-182 Flood Nozzle with 1.68" wall 1-RPV-WR53A weld/SS safe end 2 12.25" RV Core Nominal 12.25"1D 2-RPV-WR53 LAS nozzle/Alloy 82-182 Flood Nozzle with 1.68" wall 2-RPV-WR53A weld/SS safe end 12.25" RV Core Nominal 12.25"ID 3-RPV-WR53 LAS nozzle/Alloy 82-182 Flood Nozzle with 1.68" wall 3-RPV-WR53A weld/SS safe end Component Materials:
- 1. LAS nozzles are SA-508 Class 2 Low Alloy Steel (P-3).
- 2. SS safe ends are SA-336, F8M (P-8).
- 3. Welds are Alloy 82/182 (F-43).
6.0 Duration of Proposed Alternative The proposed alternative to the ASME Code is applicable for the remainder of the fourth 10-year inservice inspection (ISI) interval at ONS Units 1, 2, and 3.
7.0 Precedents Similar alternative requests have been approved for use at the following plants:
o V. C. Summer Station in an NRC letter dated February 3, 2004 (ADAMS Accession No. ML040340450) o Diablo Canyon, Units 1 and 2 in an NRC letter dated October 26, 2005 (ADAMS Accession No. ML052660331) o McGuire Nuclear Station, Unit 1 in an NRC letter dated May 13, 2009 (ADAMS Accession No. ML091140066)
Page 7
A AR EVA Document No.: 51-9112500-000 AREVA NP Inc.,
an AREVA and Siemens company Alternate Depth Sizing Criteria for Oconee Nuclear Station Core Flood Nozzle Dissimilar Metal Welds 8.0 References (1) 1998 Edition, ASME Code,Section XI, "Rules for Inservice Inspection of Nuclear Power Plant Components," 2000 Addenda.
(2) 1995 Edition, ASME Code,Section XI, with the 1996 Addenda, Appendix VIII, Supplement 10.
(3) Code Case N-695, Qualification Requirements for Dissimilar Metal Piping Welds,Section XI, Division 1.
(4) EPRI Policy/Procedure Directives
- (5) EPRI Technical Report 1010087 "Materials Reliability Program: Primary Systems Piping Butt Weld Inspection and Evaluation Guidelines (MRP-139, Revision 1).
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