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MONTHYEARDCL-07-009, Additional Commitments Related to Inspection and Mitigation of Alloy 600/82/182 Pressurizer Butt Welds2007-02-20020 February 2007 Additional Commitments Related to Inspection and Mitigation of Alloy 600/82/182 Pressurizer Butt Welds Project stage: Request ML0706704252007-03-15015 March 2007 Confirmatory Action Letter Alloy 82/182 Pressurizer Butt Welds Project stage: Other ML0724101992007-08-0707 August 2007 Mitigation of Alloy 600/82/182 Pressurizer Butt Welds in 2008 Project stage: Request ML0724201162007-09-0707 September 2007 Evaluation of Finite Element Analysis in Support of Alloy 82/182 Pressurizer Butt Weld Inspections in 2008 as Provided by CAL NRR-07-007 (Tac MD4150) Project stage: Other 1CAN100702, Request for Alternative ANO1-R&R-011, Proposed Alternative to ASME Code Requirements for Weld Overlay Repairs2007-10-0808 October 2007 Request for Alternative ANO1-R&R-011, Proposed Alternative to ASME Code Requirements for Weld Overlay Repairs Project stage: Request DCL-07-099, ASME Section XI Inservice Inspection Program Relief Request REP-1 U2, Revision 1, and Response to Request for Additional Information2007-10-22022 October 2007 ASME Section XI Inservice Inspection Program Relief Request REP-1 U2, Revision 1, and Response to Request for Additional Information Project stage: Response to RAI DCL-07-105, ASME Section XI Inservice Inspection Program Relief Request REP-1 U2, Revision 1; Response to Request for Additional Information2007-11-29029 November 2007 ASME Section XI Inservice Inspection Program Relief Request REP-1 U2, Revision 1; Response to Request for Additional Information Project stage: Response to RAI ML0801100012008-02-0606 February 2008 Approval of Relief Request REP-1 U2, Revision 1, for the Application of Weld Overlay on Dissimilar Metal Welds of Pressurizer Nozzles Project stage: Acceptance Review ML0803700262008-02-13013 February 2008 Request for Additional Information Requests for Alternative ANO1-R&R-011 for Unit 1 and ANO2-R&R-005 for Unit 2, Structural Weld Overlay Repairs to Improve Dissimilar Metal Weld Integrity Project stage: RAI 1CAN020803, Request for Alternative ANO1-R&R-011 Proposed Alternative to ASME Code Requirements for Weld Overlay Repairs2008-02-26026 February 2008 Request for Alternative ANO1-R&R-011 Proposed Alternative to ASME Code Requirements for Weld Overlay Repairs Project stage: Request DCL-08-039, Mitigation Status of Alloy 600/82/182 Pressurizer Butt Welds, Structural Weld Overlay Ultrasonic Examination Results2008-04-24024 April 2008 Mitigation Status of Alloy 600/82/182 Pressurizer Butt Welds, Structural Weld Overlay Ultrasonic Examination Results Project stage: Other ML0811301732008-06-18018 June 2008 Approval of Relief Request ANO1-R&R-011 to Use Proposed Alternative to the ASME Boilers and Pressure Vessel Code Requirements for Weld Overlay Repairs Project stage: Other 2007-08-07
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Category:Letter
MONTHYEARIR 05000368/20253012024-09-0909 September 2024 Notification of NRC Initial Operator Licensing Examination 05000368/2025301 ML24255A8642024-09-0606 September 2024 Rscc Wire & Cable LLC Dba Marmon Industrial Energy & Infrastructure - Part 21 Retraction of Final Notification IR 05000313/20240112024-09-0505 September 2024 Comprehensive Engineering Team Inspection Report 05000313/2024011 and 05000368/2024011 IR 05000313/20244042024-08-29029 August 2024 Cybersecurity Inspection Report 05000313/2024404 and 05000368/2024404 ML24239A3972024-08-23023 August 2024 Rssc Wire & Cable LLC Dba Marmon - Part 21 Final Notification - 57243-EN 57243 ML24198A0722024-08-21021 August 2024 Correction to Issuance of Amendment No. 333 Revision to Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b IR 05000313/20240052024-08-21021 August 2024 Updated Inspection Plan for Arkansas Nuclear One – Units 1 and 2 (Report 05000313/2024005, 05000368/2024005) ML24220A2642024-08-20020 August 2024 Entergy Operations, Inc. - Entergy Fleet Project Manager Assignment ML24185A1522024-08-13013 August 2024 Issuance of Amendment Nos. 334, 235, and 215, Respectively, to Revise TSs to Adopt TSTF-205 IR 05000313/20240022024-08-0606 August 2024 Integrated Inspection Report 05000313/2024002 and 05000368/2024002 ML24208A0962024-07-25025 July 2024 57243-EN 57243 - Rssc Wire & Cable LLC, Dba Marmon - Part 21 Notification ML24101A1792024-06-25025 June 2024 Issuance of Amendment No. 333 Revision to Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b ML24143A0632024-05-22022 May 2024 Notification of Inspection (NRC Inspection Report 05000368/2024003) and Request for Information ML24128A2472024-05-0808 May 2024 Project Manager Assignment IR 05000313/20240012024-05-0808 May 2024 Integrated Inspection Report 05000313/2024001 and 05000368/2024001 ML24017A2982024-04-18018 April 2024 Summary of Regulatory Audit Regarding the License Amendment Request to Revise Technical Specifications to Adopt TSTF 505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b ML24107A0282024-04-17017 April 2024 Notification of Comprehensive Engineering Team Inspection (05000313/2024011 and 05000368/2024011) and Request for Information IR 05000313/20243012024-04-16016 April 2024 NRC Examination Report 05000313/2024301 ML24086A5412024-04-10010 April 2024 Authorization of Request for Alternative ANO1-ISI-037 Regarding Extension of Reactor Vessel Inservice Inspection Interval IR 05000313/20244022024-04-0808 April 2024 Security Baseline Inspection Report 05000313/2024402 and 05000368/2024402 (Full Report) ML24089A2262024-03-29029 March 2024 Entergy Response to Regulatory Issue Summary 2024-01, Preparation and Scheduling of Operator Licensing Exams ML24075A1712024-03-15015 March 2024 Nuclear Onsite Property Damage Insurance (10 CFR 50.54(w)(3)) ML24074A2892024-03-14014 March 2024 Proof of Financial Protection (10 CFR 140.15) ML24031A6442024-03-14014 March 2024 Issuance of Amendment No. 282 to Modify Technical Specification 3.3.1, Reactor Pressure System (RPS) Instrumentation, Turbine Trip Function on Low Control Oil Pressure ML24102A1342024-03-12012 March 2024 AN1-2024-03 Post Exam Submittal IR 05000313/20230062024-02-28028 February 2024 Annual Assessment Letter for Arkansas Nuclear One- Units 1 and 2 Report 05000313/2023006 and 05000368/2023006 IR 05000313/20230042024-02-0808 February 2024 Integrated Inspection Report 05000313/2023004 and 05000368/2023004 and Independent Spent Fuel Storage Installation Inspection Report 07200013/2023002 ML24012A0502024-02-0202 February 2024 Exemption from Select Requirements of 10 CFR Part 73 (EPID L-2023-LLE-0054 (Security Notifications, Reports, and Recordkeeping and Suspicious Activity Reporting)) ML23326A0392024-01-24024 January 2024 Issuance of Amendment No. 281 Revision to Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b ML24017A1582024-01-17017 January 2024 Submittal of Emergency Plan Revision 50 IR 05000313/20234202024-01-10010 January 2024 Security Baseline Inspection Report 05000313/2023420 and 05000368/2023420 IR 05000313/20234022024-01-0202 January 2024 Security Baseline Inspection Report 05000313/2023402 and 05000368/2023402 ML23349A1672023-12-21021 December 2023 Request for Withholding Information from Public Disclosure ML23354A0022023-12-21021 December 2023 Request for Withholding Information from Public Disclosure ML23348A3572023-12-14014 December 2023 Application to Revise Technical Specifications to Use Online Monitoring Methodology – Slides and Affidavit for Pre-Submittal Meeting ML23340A1592023-12-13013 December 2023 Entergy Operations, Inc. - Entergy Fleet Project Manager Assignment ML23352A0292023-12-13013 December 2023 Entergy - 2024 Nuclear Energy Liability Evidence of Financial Protection IR 05000313/20234052023-12-12012 December 2023 – Security Baseline Inspection Report 05000313/2023405 and 05000368/2023405 ML23341A0832023-12-11011 December 2023 – Material Control and Accounting Program Inspection Report 05000313/368/2023404- Cover Letter ML23305A0922023-12-0707 December 2023 Summary of Regulatory Audit Regarding License Amendment Request to Revise Technical Specifications to Adopt TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times RITSTF Initiative 4b ML23333A1362023-11-29029 November 2023 Supplement to Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23275A2072023-11-28028 November 2023 Issuance of Amendment No. 280 Removal of Technical Specification Condition Allowing Two Reactor Coolant Pump Operation IR 05000313/20230032023-11-21021 November 2023 Revised - ANO Revised Integrated Inspection Report 05000313/2023003 and 05000368/2023003 and Independent Spent Fuel Storage Installation Inspection Report 07200013/ 2023001 ML23325A1412023-11-21021 November 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation ML23313A0962023-11-13013 November 2023 Integrated Inspection Report 05000313/2023003 and 05000368/2023003 and Independent Spent Fuel Storage Installation Inspection Report 07200013/2023001 ML23243B0452023-11-13013 November 2023 Request for Withholding Information from Public Disclosure 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 IR 05000313/20230112023-10-10010 October 2023 Commercial Grade Dedication Inspection Report 05000313/2023011 and 05000368/2023011 IR 05000313/20230052023-08-21021 August 2023 Updated Inspection Plan for Arkansas Nuclear One, Units 1 and 2 (Report 05000313/2023005 and 05000368/2023005) - Mid Cycle IR 05000313/20230022023-08-11011 August 2023 Integrated Inspection Report 05000313/2023002 and 05000368/2023002 and Notice of Violation 2024-09-09
[Table view] Category:Request for Additional Information (RAI)
MONTHYEARML24143A0632024-05-22022 May 2024 Notification of Inspection (NRC Inspection Report 05000368/2024003) and Request for Information ML24107A0282024-04-17017 April 2024 Notification of Comprehensive Engineering Team Inspection (05000313/2024011 and 05000368/2024011) and Request for Information ML24088A0082024-03-27027 March 2024 NRR E-mail Capture - ANO-2 -- TSTF-505 Post-Audit Final RAI (L-2023-LLA-0052) ML23130A2972023-05-17017 May 2023 Notification of Inspection (NRC Inspection Report 05000313/2023003) and Request for Information ML23104A1052023-03-10010 March 2023 NRR E-mail Capture - ANO-2 Final RAI Alternative Request for Life-of-Repair of RVCH Pen. 46 ML23019A0672023-01-19019 January 2023 Inservice Inspection Request for Information ML22349A0112022-12-14014 December 2022 NRR E-mail Capture - Final RAI Relief Request ANO1-ISI-035 ML22213A1662022-08-0101 August 2022 Information Request, Security IR 2022401 ML22208A0542022-07-26026 July 2022 Request for Information ML22174A1362022-06-23023 June 2022 NRR E-mail Capture - ANO-2 Final RAI Relief Requests ANO2-ISI-023 Through -028 (EPIDs L-2022-LLR-0022 Through -0027) ML22159A3242022-06-0909 June 2022 Notification of NRC Triennial Heat Exchanger/Sink Performance Inspection (05000313/2022003 and 05000368/2022003) and Request for Information ML22151A3262022-05-31031 May 2022 August 2022 Emergency Preparedness Exercise Inspection - Request for Information ML22124A2452022-05-0404 May 2022 NRR E-mail Capture - ANO-1 and ANO-2 - Final RAI 2 License Amendment Requests to Implement Provisions of 10 CFR 50.69 (L-2021-LLA-0105/-0106) ML22122A2952022-05-0404 May 2022 Notification of Inspection NRC Inspection Report 05000368/2022003 and Request for Information ML22108A1642022-04-18018 April 2022 NRR E-mail Capture - ANO-1: Final RAI License Amendment Request Concerning TS Changes Due to Revised Dose Calculations (L-2021-LLA-0181) ML22034A5482022-02-0303 February 2022 NRR E-mail Capture - Final RAI License Amendment Requests to Implement Provisions of 10 CFR 50.69 (L-2021-LLA-0105/-0106) ML22020A0822022-01-19019 January 2022 NRR E-mail Capture - ANO-1 and 2 - Final RAI 2 License Amendment Requests to Allow the ECP to Remain Operable on a One-Time Basis for Up to 65 Days to Perform Piping Upgrade (L-2021-LLA-0015) ML21312A0382021-11-0505 November 2021 NRR E-mail Capture - ANO-2 RAI Relief Request ANO2-RR-21-002 ML21286A7132021-10-15015 October 2021 ANO2022010 Tfp RFI Stg, Arkansas Nuclear One, Units 1 and 2 - Notification of an NRC Fire Protection Baseline Inspection (NRC Inspection Report 05000313/2022010 and 05000368/2022010) and Request for Information ML21273A0672021-09-29029 September 2021 NRR E-mail Capture - ANO-2 Final RAI 2 License Amendment Request to Adopt a Safety Function Determination Program ML21236A3222021-09-19019 September 2021 Request for Information ML21252A0052021-08-20020 August 2021 NRR E-mail Capture - ANO-1 and 2 Final RAI License Amendment Request to Allow the ECP to Remain Operable on a One-Time Basis for Up to 65 Days to Perform Piping Upgrade (L-2021-LLA-0015) ML21217A3302021-08-0505 August 2021 (ANO) Problem Identification and Resolution (PIR) Request for Information Combined ML21204A0842021-07-28028 July 2021 ANO Phase 4 2021013 RFI Gap ML21197A0372021-07-16016 July 2021 NRR E-mail Capture - ANO-1 and 2 - Final RAI Final Response to GL 2004-02 0CAN042105, Supplement to Response to Request for Additional Information Reduction of Commitment to the Entergy Operation'S Quality Assurance Program Manual Description2021-04-30030 April 2021 Supplement to Response to Request for Additional Information Reduction of Commitment to the Entergy Operation'S Quality Assurance Program Manual Description ML21116A1092021-04-26026 April 2021 NRR E-mail Capture - ANO-1 and ANO-2: Final Supplemental RAI Proposed Alternative to ASME Section XI Requirements for Repair/Replacement of ECP Supply Piping ML21105A0122021-04-0909 April 2021 NRR E-mail Capture - ANO-2 Final RAI License Amendment Request to Adopt a Safety Function Determination Program ML21071A2172021-03-10010 March 2021 NRR E-mail Capture - ANO-1 and ANO-2 - Final RAI Proposed Change to Quality Assurance Program Manual ML21026A2682021-01-26026 January 2021 Request for Information ML21022A0842021-01-22022 January 2021 Request for Additional Information - Proposed Alternative to ASME Section XI Requirements for Repair/Replacement of Emergency Cooling Pond Supply Piping - Arkansas Nuclear One,Units 1 and 2 -Entergy Operations, Inc. NON-PROPRIETARY Redacted ML21019A5142021-01-14014 January 2021 March 2021 Emergency Preparedness Exercise Inspection - Request for Information ML20324A6412020-11-19019 November 2020 NRR E-mail Capture - ANO-1 - Final RAI Relief Request ANO1-ISI-034 ML20316A0102020-11-0202 November 2020 NRR E-mail Capture - ANO-1 and ANO-2 - Final RAI Concerning Relief Request EN-20-RR-01 ML20262H0752020-09-17017 September 2020 NRR E-mail Capture - ANO-2 Final RAI 2 License Amendment Request Concerning Proposed Technical Specification Additions, Deletions, and Relocations ML20260H4762020-09-0909 September 2020 NRR E-mail Capture - ANO-1 Final RAI License Amendment Request to Revise Lov Relay Allowable Values ML20154K7622020-06-0101 June 2020 NRR E-mail Capture - ANO-2 Final RAI License Amendment Request Concerning Proposed Technical Specification Additions, Deletions, and Relocations ML20119A0982020-04-28028 April 2020 Notification of Inspection (NRC Inspection Report 05000368/2020003 and Request for Information ML20106E8522020-04-13013 April 2020 Information Request, NRC Inspection Report 05000313/2020410 and 05000368/2020410 ML20065H7992020-03-0606 March 2020 Supplemental Information Needed for Acceptance of Requested Licensing Action License Amendment Request to Revise Loss of Voltage Relay Allowable Values ML20055E9092020-02-24024 February 2020 NRR E-mail Capture - ANO-2 Final RAI License Amendment Request to Revise Control Element Assembly Drop Time ML20036D3092020-02-0505 February 2020 NRR E-mail Capture - ANO-2 - Final RAI Alternative Request VRR-ANO2-2019-1 ML20013C7472020-01-10010 January 2020 NRR E-mail Capture - ANO-1 and 2 -- Final RAI #2 LAR to Incorporate Tornado Missile Risk Evaluator (TMRE) Into Licensing Basis ML19316A0242019-11-0707 November 2019 NRR E-mail Capture - ANO-1 - - Final RAI Concerning Relief Request ANO1-ISI-033 (L-2019-LLR-0100) ML19280A0402019-10-0707 October 2019 NRR E-mail Capture - ANO-1 and 2 - Final RAI #1 License Amendment Request to Incorporate Tornado Missile Risk Evaluator (TMRE) Into Licensing Basis ML19339F5902019-09-23023 September 2019 Request for Information: Arkansas Nuclear One, IR 05000313/2019-004 Occupational Radiation Safety Inspection ML19281E0032019-08-0505 August 2019 ANO 2019 PIR Request for Information ML19203A0122019-07-16016 July 2019 Request for Information - Inservice Inspection Activities (NRC Inspection Report 05000313/2019004) ML19106A4322019-04-16016 April 2019 NRR E-mail Capture - ANO-2 Final RAI Re LAR to Add TS Actions to Address Inoperability of the Containment Building Sump ML19058A8332019-02-27027 February 2019 NRR E-mail Capture - ANO-1 - Final RAI Relief Request ANO1-ISI-032 2024-05-22
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February 13, 2008 Mr. Timothy G. Mitchell Vice President, Operations Arkansas Nuclear One Entergy Operations, Inc.
1448 S. R. 333 Russellville, AR 72802
SUBJECT:
ARKANSAS NUCLEAR ONE - REQUEST FOR ADDITIONAL INFORMATION REGARDING REQUESTS FOR ALTERNATIVE ANO2-R&R-005 (UNIT 2) AND ANO1-R&R-011 (UNIT 1), WELD OVERLAY OF DISSIMILAR METAL WELDS (TAC NOS. MD4907 AND MD6958)
Dear Mr. Mitchell:
By letters dated March 21, and October 8, 2007, Entergy Operations, Inc. (the licensee) submitted requests for alternative ANO2-R&R-005 (Unit 2) and ANO1-R&R-011 (Unit 1),
respectively, to the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code, for mitigating primary water stress-corrosion cracking on dissimilar metal welds using full structural weld overlays at Arkansas Nuclear One.
The U.S. Nuclear Regulatory Commission staff has reviewed the requests, and determined that we require additional information to complete our review. A request for additional information is enclosed. This request was discussed with David Bice of your staff on January 30, 2008, and it was agreed that a response would be provided within 30 days of receipt of the request.
If you or your staff have any questions concerning the resolution of this matter, please contact me at (301) 415-1445.
Sincerely,
/RA/
Alan B. Wang, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-313 and 50-368
Enclosure:
Request for Additional Information cc w/encl: See next page
ML080370026 OFFICE DORL/LPL4/PM DORL/LPL4/PM DORL/LPL4/PM NAME AWang JBurkhardt THiltz DATE 2/8/08 2/8/08 2/13/08 Arkansas Nuclear One (November 2007) cc:
Senior Vice President Senior Manager, Nuclear Safety Entergy Nuclear Operations & Licensing P.O. Box 31995 Entergy Operations, Inc.
Jackson, MS 39286-1995 1340 Echelon Parkway Jackson, MS 39213-8298 Senior Vice President
& Chief Operating Officer Manager, Licensing Entergy Operations, Inc. Entergy Operations, Inc.
P.O. Box 31995 Arkansas Nuclear One Jackson, MS 39286-1995 1448 SR 333 Russellville, AR 72802 Vice President, Operations Support Entergy Operations, Inc. Section Chief, Division of Health P.O. Box 31995 Radiation Control Section Jackson, MS 39286-1995 Arkansas Department of Health and Human Services Site Vice President 4815 West Markham Street, Slot 30 Entergy Operations, Inc. Little Rock, AR 72205-3867 Arkansas Nuclear One 1448 S.R. 333 Section Chief, Division of Health Russellville, AR 72802 Emergency Management Section Arkansas Department of Health and General Manager Plant Human Services Operations 4815 West Markham Street, Slot 30 Entergy Operations, Inc. Little Rock, AR 72205-3867 Arkansas Nuclear One 1448 SR 333 Pope County Judge Russellville, AR 72802 Pope County Courthouse 100 W. Main Street Director, Nuclear Safety & Licensing Russellville, AR 72801 Entergy Services, Inc.
440 Hamilton Avenue Senior Resident Inspector White Plains, NY 10601 U.S. Nuclear Regulatory Commission P.O. Box 310 Director, Nuclear Safety Assurance London, AR 72847 Entergy Operations, Inc.
Arkansas Nuclear One Regional Administrator, Region IV 1448 SR 333 U.S. Nuclear Regulatory Commission Russellville, AR 72802 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064
REQUEST FOR ADDITIONAL INFORMATION REQUEST FOR ALTERNATIVE ANO1-R&R-011 AND ANO2-R&R-005 WELD OVERLAY OF DISSIMILAR METAL WELDS ARKANSAS NUCLEAR ONE, UNITS 1 AND 2 ENTERGY OPERATIONS, INC.
By letters dated March 21, and October 8, 2007 (Agencywide Documents Access and Management System Accession Nos. ML070860369 and ML072910042, respectively), Entergy Operations, Inc. (the licensee) submitted requests for alternative ANO2-R&R-005 (Unit 2) and ANO1-R&R-011 (Unit 1), respectively, to the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME Code), for mitigating primary water stress-corrosion cracking on dissimilar metal welds using full structural weld overlays at Arkansas Nuclear One (ANO). To complete its review, the NRC staff is requesting the following additional information:
Unit 1, ANO1-R&R-011
- 1. What are the beginning and end dates for the fourth 10-year inservice inspection (ISI) interval at Unit 1?
- 2. On page 4 of 14 of the October 8, 2007, submittal, the licensee stated that it will apply a butter (transitional) layer of austenitic stainless steel filler metal across the austenitic stainless steel base metal.
- a. Discuss whether paragraph (e) of Code Case N-504-2 is applicable to the butter layer if austenitic stainless steel filler metal is applied.
Paragraph (e) requires existence of certain delta ferrite content in the welded metal when austenitic stainless steel weld metal is used.
- b. Identify the austenitic stainless steel weld filler metal that will be used for the butter layer.
- c. Confirm that the Certified Material Test Report (CMTR) for the austenitic stainless steel filler wire shows a minimum delta ferrite of a specified amount. Provide the maximum and minimum delta ferrite content for the heat of austenitic stainless steel filler wire to be used, as stated on the CMTR.
Unit 2, ANO2-R&R-011
- 1. In the March 21, 2007, letter, the licensee requested U.S. Nuclear Regulatory Commission (NRC) approval of Request for Alternative ANO2-R&R-005 to support the 19th refueling outage at Unit 2 currently scheduled for the spring 2008. However, the duration of the proposed alternative is not specified in the
March 21, 2007, submittal other than for the spring 2008 refueling outage.
Please confirm/clarify the duration of the proposed alternative.
- 2. In Section V.A.3.c of Request for Alternative ANO2-R&R-005, the licensee discussed the inspection issues regarding cast austenitic stainless steel (CASS) safe ends of the surge and hot-leg shutdown cooling nozzles. The licensee stated correctly that the ultrasonic examination (UT) has not been qualified in accordance with Appendix VIII, Supplement 11 of the ASME Code,Section XI, in the examination of cast austenitic stainless steel. The licensee stated further that a flaw with a depth of 75 percent of pipe thickness and circumference of 360 degrees will be assumed in the crack-growth calculation for the cast stainless steel safe ends. In light of the limiting capability of the current UT technology in the CASS examination, the postulated 75 percent depth flaw may not be adequate to assess the structural integrity of the CASS component.
Pending the qualified UT for the CASS material, the licensee might consider other options such as:
- a. Option (1). Size the initial flaw depth at 100 percent through-wall for the crack-growth calculations.
- b. Option (2). If the 100 percent through-wall flaw is impractical or creates a hardship in the overlay design or installation, an initial flaw with a 75 percent through-wall depth may be assumed in the crack-growth calculation. However, with this option the required inspection volume needs to be examined at a higher frequency than the requirements in proposed alternative ANO2-R&R-005.
The licensee is requested to provide an approach to resolve the CASS issue in Alternative ANO2-R&R-005.
- 3. On page 5, first paragraph, of the March 21, 2007, submittal, the licensee stated that it may apply a butter (transitional) layer of austenitic stainless steel filler metal across the austenitic stainless steel base metal.
- a. Discuss whether paragraph (e) of Code Case N-504-2 is applicable to the butter layer if austenitic stainless steel filler metal is applied.
Paragraph (e) requires existence of certain delta ferrite content in the welded metal when austenitic stainless steel weld metal is used.
- b. Identify the austenitic stainless steel weld filler metal that will be used for the butter layer.
- c. Confirm that the CMTR for the austenitic stainless steel filler wire shows a minimum delta ferrite of a specified amount. Provide the maximum and minimum delta ferrite content for the heat of austenitic stainless steel filler wire to be used, as stated on the CMTR.