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| | number = ML15239B322 | | | number = ML15239B322 |
| | issue date = 09/09/2015 | | | issue date = 09/09/2015 |
| | title = 06/10/2015 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 (TAC Nos. MC4702, MC4703 and MC4704) | | | title = Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 |
| | author name = Watford M M | | | author name = Watford M |
| | author affiliation = NRC/NRR/DORL/LPLIV-1 | | | author affiliation = NRC/NRR/DORL/LPLIV-1 |
| | addressee name = Edington R K | | | addressee name = Edington R |
| | addressee affiliation = Arizona Public Service Co | | | addressee affiliation = Arizona Public Service Co |
| | docket = 05000528, 05000529, 05000530 | | | docket = 05000528, 05000529, 05000530 |
| | license number = NPF-041, NPF-051, NPF-074 | | | license number = NPF-041, NPF-051, NPF-074 |
| | contact person = Watford M M | | | contact person = Watford M |
| | case reference number = GL-04-002, TAC MC4702, TAC MC4703, TAC MC4704 | | | case reference number = GL-04-002, TAC MC4702, TAC MC4703, TAC MC4704 |
| | document type = Meeting Summary | | | document type = Meeting Summary |
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| =Text= | | =Text= |
| {{#Wiki_filter:LICENSEE: FACILITY: | | {{#Wiki_filter:UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 9, 2015 LICENSEE: Arizona Public Service Company FACILITY: Palo Verde Nuclear Generating Station, Units 1, 2, and 3 |
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| ==SUBJECT:== | | ==SUBJECT:== |
| UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 9, 2015 Arizona Public Service Company Palo Verde Nuclear Generating Station, Units 1, 2, and 3 SUMMARY OF JUNE 10, 2015, MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING THE ONGOING RESOLUTION OF GENERIC LETTER 2004-02 FOR PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 (TAC NOS. MC4702, MC4703, and MC4704) On June 10, 2015, the U.S. Nuclear Regulatory Commission (NRC) staff hosted a Category 1 public meeting conference call with staff from Arizona Public Service Company (APS, the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of this meeting was to discuss the recent insulation discovery and resolution options relating to Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for Palo Verde Nuclear Generating Station (PVNGS), Units 1, 2, and 3. The meeting notice and agenda, dated May 28, 2015 are available in the Agencywide Documents Access and -Management System (ADAMS) at Accession No. ML 15149A033. The licensee provided presentation slides, which are available at ADAMS Accession No. ML 15156B352. The enclosure contains the meeting attendance list. The licensee presented an overview of the recent insulation discovery and provided information regarding resolution of GL 2004-02 for PVNGS. On December 18, 2013, APS submitted Revision 2 to the supplemental response to GL 2004-02 (ADAMS Accession No. ML On April 15, 2015, APS entered into its corrective action program its failure to identify and evaluate microtherm on the reactor vessel. The microtherm was discovered in several locations on the reactor vessel, including an approximately 10 foot band encompassing the hot and cold leg elevation, during an unrelated review of plant drawings. The licensee confirmed that the insulation is assumed to be the same on all three units at PVNGS. The licensee stated microtherm was previously removed on the reactor vessel head; however, the recently identified microtherm is at different locations. The licensee discussed the possible reactor vessel microtherm break locations and identified the hot leg nozzle off the steam generator as the most limiting break location. The NRC staff noted that the breaks that could result in damage to the insulation are within the region of the reactor annulus. The staff also noted that the locations of the breaks may be restrained, which would result in smaller damage zones than fully separated breaks. The licensee compared the latent and additional fiber for the limiting break location and the microtherm break location. The licensee stated that APS likely has not performed extensive plant-specific tests but noted that industry testing indicated that the microtherm will block flow if a fiber bed is present on the strainer, and in the absence of fiber, microtherm will act as a particulate and flow through open strainer areas. The licensee then discussed the pocket strainer configuration at PVNGS and the results of sump strainer performance testing. The NRC staff asked if the results from the strainer testing resulted in bare strainer area. The licensee stated the results were based on net positive suction head, not open strainer area. The licensee stated APS would include more information regarding the potential effects of microtherm debris in a future submittal. The NRC staff noted that Beaver. Valley Power Station had a similar microtherm situation and suggested APS look at the response to NRC's request for information dated September 28, 2010 (ADAMS Accession No. ML 102770023). The NRC staff suggested that it would be beneficial if the cause for the oversight was shared with industry so that other licensees could ensure that similar issues had not occurred at t.heir facilities. APS presented three potential outcomes for a path forward to resolve GL 2004-02. The first outcome is to demonstrate the reactor vessel break is not limiting with respect to ECCS strainer performance in order to determine if the current submittal is still bounding. The second outcome is to remove the insulation. The third outcome is to justify the current configuration using a informed approach or further evaluation and testing. APS stated that a third-party vendor will evaluate the potential effects of the newly discovered microtherm insulation. After further analysis, APS would like to schedule another public meeting to discuss the resolution of GL 2004-02, including a revised supplemental response. The NRC did not receive any public meeting feedback forms and there were no comments from the public. If you have any questions, please contact me at (301) 415-1233 or via e-mail at Margaret.Watford@nrc.gov. Docket No. STN 50-529
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| | ==SUMMARY== |
| | OF JUNE 10, 2015, MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING THE ONGOING RESOLUTION OF GENERIC LETTER 2004-02 FOR PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 (TAC NOS. MC4702, MC4703, and MC4704) |
| | On June 10, 2015, the U.S. Nuclear Regulatory Commission (NRC) staff hosted a Category 1 public meeting conference call with staff from Arizona Public Service Company (APS, the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of this meeting was to discuss the recent insulation discovery and resolution options relating to Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for Palo Verde Nuclear Generating Station (PVNGS), Units 1, 2, and 3. The meeting notice and agenda, dated May 28, 2015 are available in the Agencywide Documents Access and |
| | - Management System (ADAMS) at Accession No. ML15149A033. The licensee provided presentation slides, which are available at ADAMS Accession No. ML15156B352. The enclosure contains the meeting attendance list. |
| | The licensee presented an overview of the recent insulation discovery and provided information regarding resolution of GL 2004-02 for PVNGS. On December 18, 2013, APS submitted Revision 2 to the supplemental response to GL 2004-02 (ADAMS Accession No. ML 13357~218). On April 15, 2015, APS entered into its corrective action program its failure to identify and evaluate microtherm on the reactor vessel. The microtherm was discovered in several locations on the reactor vessel, including an approximately 10 foot band encompassing the hot and cold leg elevation, during an unrelated review of plant drawings. The licensee confirmed that the insulation is assumed to be the same on all three units at PVNGS. The licensee stated microtherm was previously removed on the reactor vessel head; however, the recently identified microtherm is at different locations. The licensee discussed the possible reactor vessel microtherm break locations and identified the hot leg nozzle off the steam generator as the most limiting break location. The NRC staff noted that the breaks that could result in damage to the insulation are within the region of the reactor annulus. The staff also noted that the locations of the breaks may be restrained, which would result in smaller damage zones than fully separated breaks. |
| | The licensee compared the latent and additional fiber for the limiting break location and the microtherm break location. The licensee stated that APS likely has not performed extensive plant-specific tests but noted that industry testing indicated that the microtherm will block flow if a fiber bed is present on the strainer, and in the absence of fiber, microtherm will act as a particulate and flow through open strainer areas. The licensee then discussed the pocket |
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| | strainer configuration at PVNGS and the results of sump strainer performance testing. The NRC staff asked if the results from the strainer testing resulted in bare strainer area. The licensee stated the results were based on net positive suction head, not open strainer area. |
| | The licensee stated APS would include more information regarding the potential effects of microtherm debris in a future submittal. The NRC staff noted that Beaver. Valley Power Station had a similar microtherm situation and suggested APS look at the response to NRC's request for information dated September 28, 2010 (ADAMS Accession No. ML102770023). |
| | The NRC staff suggested that it would be beneficial if the cause for the oversight was shared with industry so that other licensees could ensure that similar issues had not occurred at t.heir facilities. |
| | APS presented three potential outcomes for a path forward to resolve GL 2004-02. The first outcome is to demonstrate the reactor vessel break is not limiting with respect to ECCS strainer performance in order to determine if the current submittal is still bounding. The second outcome is to remove the insulation. The third outcome is to justify the current configuration using a risk-informed approach or further evaluation and testing. APS stated that a third-party vendor will evaluate the potential effects of the newly discovered microtherm insulation. After further analysis, APS would like to schedule another public meeting to discuss the resolution of GL 2004-02, including a revised supplemental response. |
| | The NRC did not receive any public meeting feedback forms and there were no comments from the public. |
| | |
| | If you have any questions, please contact me at (301) 415-1233 or via e-mail at Margaret.Watford@nrc.gov. |
| | s;;~ |
| | Margaret M. Watford, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-529 |
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| ==Enclosure:== | | ==Enclosure:== |
| As stated cc w/encl: Distribution via Listserv Margaret M. Watford, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation LIST OF ATTENDEES JUNE 10, 2015. PUBLIC MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING ONGOING RESOLUTION OF GL 2004-02 . PALO VERDE. UNITS 1. 2. AND 3 Name Affiliation Margaret Watford NRC Victor Cusumano NRC Matthew Yoder NRC Stephen Smith NRC John Stang NRC Paul Klein NRC Marioly Diaz NRC Lindsay Robinson NRC Andrea Russell NRC Thomas Weber APS Mark McGhee APS Michael Dilorenzo APS Don Vogt APS Domenic Macedonia APS Carl Stafford APS Jenny Tolar APS Jorge Rodriguez APS Delbert Elkington APS Megan Stachowiak Ali on Andrew Roudenko Ali on Bruce Letelliar Ali on Enclosure
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| ML152398322 OFFICE NRR/DORL/LPL4-1 /PM NAME MWatford DATE 08/27/15 OFFICE NRR/DSS/SSIB NAME VCusumano* DATE 08/28/15 Sincerely, IRA/ Margaret M. Watford, Project Manager Plant Licensing. Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation MYoder, NRR/DE/ESGB PKlein, NRR/DE/ESGB SSmith, NRR/DSS/SSIB JStang, NRR/DSS/SSIB LRobinson, NRR/DSS/SSIB ARussell, NRR/DSS/SSIB RidsNrrDorllpl4-1 Resource RidsNrrPMPaloVerde Resource RidsNrrLAJBurkhardt Resource RidsRgn4MailCenter Resource *concurrence via email NRR/DORL/LPL4-1 /LA NRR/DE/ESGB/BC JBurkhardt (KGoldstein'for) GKulesa* 08/27/15 08/31/15 NRR/DORL/LPL4-1 /BC NRR/DORL/LPL4-1 /PM MMarkley MWatford 9/9/15 9/9/15}} | | As stated cc w/encl: Distribution via Listserv |
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| | LIST OF ATTENDEES JUNE 10, 2015. PUBLIC MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING ONGOING RESOLUTION OF GL 2004-02 |
| | . PALO VERDE. UNITS 1. 2. AND 3 Name Affiliation Margaret Watford NRC Victor Cusumano NRC Matthew Yoder NRC Stephen Smith NRC John Stang NRC Paul Klein NRC Marioly Diaz NRC Lindsay Robinson NRC Andrea Russell NRC Thomas Weber APS Mark McGhee APS Michael Dilorenzo APS Don Vogt APS Domenic Macedonia APS Carl Stafford APS Jenny Tolar APS Jorge Rodriguez APS Delbert Elkington APS Megan Stachowiak Ali on Andrew Roudenko Ali on Bruce Letelliar Ali on Enclosure |
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| | ML152398322 *concurrence via email OFFICE NRR/DORL/LPL4-1 /PM NRR/DORL/LPL4-1 /LA NRR/DE/ESGB/BC NAME MWatford JBurkhardt (KGoldstein'for) GKulesa* |
| | DATE 08/27/15 08/27/15 08/31/15 OFFICE NRR/DSS/SSIB NRR/DORL/LPL4-1 /BC NRR/DORL/LPL4-1 /PM NAME VCusumano* MMarkley MWatford DATE 08/28/15 9/9/15 9/9/15}} |
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MONTHYEARML0515202672005-06-0202 June 2005 6/2/05, Palo Verde, RAI, Potential Impact of Debris Blockage on Emergency Sump Recirculation at Pressurized-Water Reactors Project stage: RAI ML0603903502006-02-0909 February 2006 RAI, Response to Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design-basis Accidents at Pressurized-Water Reactors (TAC Nos. MC4702, MC4703, and M4704) Project stage: RAI ML0833701622008-11-14014 November 2008 Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2, and 3, Notification and Concurrence of Extension for Submittal of the Revised Supplemental Response to NRC Generic Letter 2004-02 Project stage: Request ML0832503462008-11-14014 November 2008 E-Mail Response Re Licensee'S Request for Extension to Revised Supplemental Response to Generic Letter 2004-02 Project stage: Other ML0832309372008-12-0303 December 2008 Extension Request for Submittal of the Revised Supplemental Response to Generic Letter 2004-02 Project stage: Other ML0834305492008-12-16016 December 2008 Request for Additional Information Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized Water Reactors Project stage: RAI ML15156B3522015-06-0404 June 2015 Draft Slides for Public Meeting with Arizona Public Service Company Ongoing Resolution of Generic Letter 2004-02 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML15236A1342015-08-26026 August 2015 Presentation Slides for Public Meeting with Arizona Public Service Generic Letter 2004-02 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 Project stage: Meeting ML15239B3222015-09-0909 September 2015 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 Project stage: Meeting ML15268A1312015-10-0505 October 2015 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 Project stage: Meeting ML15348A0542015-12-15015 December 2015 Slides for December 17, 2015 Public Meeting with APS on Resolution of GL 2004-02 Project stage: Meeting 2008-12-03
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Category:Meeting Summary
MONTHYEARML23258A1402023-09-27027 September 2023 Summary of August 31, 2023, Presubmittal Meeting with Arizona Public Service Company to Discuss Planned Submittal of License Renewal Commitment Regarding Alloy 600 Management Program Plan at Palo Verde Station, Units 1, 2, & 3 ML23150A1982023-06-0505 June 2023 Summary of 5/25/2023, Presubmittal Meeting with Arizona Public Service Company to Discuss ASME, Section XI Appendix L Alternate Approach to Pressurizer Surge Line Inspections at Palo Verde, Units 1, 2, and 3 ML23097A0692023-04-14014 April 2023 Summary of Presubmittal Meeting with Arizona Public Service Company to Discuss Proposed License Amendment Request Regarding Containment Temperature and Safety Injection Tank Volume at Palo Verde Units 1, 2, and 3 ML23095A0932023-04-0606 April 2023 Summary of April 4, 2023, Presubmittal Meeting with Arizona Public Service Company to Discuss Proposed License Amendment Request to Adopt TSTF-266 at Palo Verde Nuclear Generating Station ML23072A0312023-03-14014 March 2023 March 1, 2023, Summary of Meeting with Arizona Public Service Company to Discuss Proposed 10 CFR 20.1703 and 20.1705 Requests to Use Supplied Air Suits at Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML22314A2742022-11-15015 November 2022 October 27, 2022 Meeting with Arizona Public Service Company to Discuss Proposed LAR to Adopt TSTF-107, Revision 4, Separate Control Rods That Are Untrippable Versus Inoperable, for Palo Verde, Units 1, 2, & 3 ML22147A0932022-06-0606 June 2022 2021 Annual Assessment Public Meeting Summary ML22098A0322022-04-20020 April 2022 Summary of April 6, 2022, Public Meeting with Arizona Public Service Company to Discuss Upcoming License Amendment Request to Adopt Technical Specification Task Force Traveler TSTF-487 (EPID L-LRM-0025) ML21347A9522021-12-14014 December 2021 Summary of December 9, 2021, Public Meeting with Arizona Public Service Company to Discuss Upcoming LAR to Adopt TSTF-567, Add Containment TS to Address GSI-191 Issues for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML21333A0022021-12-0202 December 2021 Summary of Pre-Submittal Meeting with Arizona Public Service Company RIPE Exemption for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML21278A5462021-10-13013 October 2021 Summary of Meeting with Arizona Public Service Company to Discuss Relief Request No. 68 for Certain ASME Code Piping for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML21245A4152021-09-0808 September 2021 Summary of Public Meeting with Arizona Public Service Company to Discuss Upcoming Exemption to Eliminate Diverse Auxiliary Feedwater Actuation System Using Risk-Informed Process for Evaluations for Palo Verde Nuclear Generating Station ML21168A2632021-06-24024 June 2021 Summary of June 16, 2021, Public Meeting with Arizona Public Service Company to Discuss Upcoming Relief Request No. 67, Extension of Containment Tendon Inservice Testing from 10 Years to 20 Years for Palo Verde Nuclear Generating Station, U ML21140A3892021-05-24024 May 2021 Riv Column 1 EOC 2020 Public Meeting Summary ML21134A0002021-05-18018 May 2021 Summary of Public Meeting with Arizona Public Service Company to Discuss Upcoming Order License Transfer from Pnm to Salt River Project Agriculture Improvement and Power District for Palo Verde, Units 1 and 2 and the ISFSI ML21061A3202021-03-10010 March 2021 Summary of February 25, 2021, Public Meeting with Nuclear Energy Institute to Further Discuss the Inclusion of TSTF-425 Under the Risk-Informed Process for Evaluations Initiative ML21055A8502021-02-24024 February 2021 Public Meeting Summary ML21011A2742021-01-26026 January 2021 Summary of January 6, 2021, Public Meeting with Arizona Public Service Company to Discuss Upcoming LAR Regarding Containment Integrated Leak Rate Test Permanent Extension to 15 Years for Palo Verde Nuclear Generating Station, Units 1, 2, an ML20189A2832020-07-0707 July 2020 Summary of Region IV Annual Assessment Public Meeting ML19219A6122019-08-13013 August 2019 Summary of July 11, 2019, Teleconference with APS to Discuss Proposed License Amendment Request to Revise the Emergency Plan for Palo Verde Nuclear Generating Station ML17353A1902017-12-29029 December 2017 Summary of 12/12/2017, Public Meeting with Arizona Public Service Company, on Proposed Relief Request 50 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML17003A0352017-01-0404 January 2017 Summary of Pre-Application Meeting with Arizona Public Service to Discuss a Proposed Second Emergency License Amendment Request to Revise Technical Specification 3.8.1, AC (Alternating Current) Sources - Operating, for Palo Verde Nuclear ML16088A0602016-04-15015 April 2016 3/24/16 Summary of Pre-application Meeting with Arizona Public Service Company to Discuss Next Generation Fuel License Amendment Request for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 ML16028A3942016-02-12012 February 2016 Summary of Prelicensing Meeting with Arizona Public Service Company to Discuss Next Generation Fuel License Amendment Request for Palo Verde, Units 1, 2, and 3 ML16011A0582016-01-21021 January 2016 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 ML15306A2352015-11-13013 November 2015 Summary of Presubmittal Meeting with Arizona Public Service Company to Discuss Degraded Voltage Relay Setpoints License Amendment Request for Palo Verde, Units 1, 2, and 3 ML15286A0282015-10-23023 October 2015 Summary of Presubmittal Meeting with Arizona Public Service Company to Discuss Revised Methodology for Spent Fuel Pool Criticality Analysis and Associated Technical Specification Changes for Palo Verde, Units 1, 2, and 3 (CAC MF6600-MF6602) ML15268A1312015-10-0505 October 2015 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 ML15239B3222015-09-0909 September 2015 Summary of Public Meeting Via Conference Call with Arizona Public Service Company Regarding Ongoing Resolution of Generic Letter 2004-02 for Palo Verde, Units 1, 2, and 3 ML15244B0772015-09-0101 September 2015 Summary of Annual Assessment Meeting with Arizona Public Service Regarding Palo Verde Nuclear Generating Station 2014 Performance ML15173A2892015-06-30030 June 2015 June 9, 2015, Summary of Category 1 Public Meeting with Arizona Public Service Company to Discuss Palo Verde Nuclear Generating Station Seismic Hazard Reevaluation Associated with Implementation of Japan Lessons-Learned NTTF Recommendation ML15140A3142015-06-16016 June 2015 Summary of Preapplication Meeting with Arizona Public Service Company to Discuss Revised Methodology for Spent Fuel Pool Criticality Analysis and Associated Technical Specification Changes for Palo Verde, Units 1, 2, and 3 (TAC MF5843-MF584 ML15117A0422015-04-29029 April 2015 Memorandum to File Summarizing 4/24/15 Telephone Conference Granting Verbal Relief for Relief Request 53, Request for Approval of an Alternative to ASME Code, Section XI, Requirements for Flaw Removal ML15078A0052015-03-25025 March 2015 Summary of 2/18/2015 Preapplication Meeting with Arizona Public Service Company to Discuss License Amendment Request for Palo Verde, Units 1, 2, and 3 on TSTF-505, Risk-Informed Technical Specifications ML14150A1772014-06-0202 June 2014 Summary of Conference Call Regarding Spring 2014 Steam Generator Tube Inspections ML14136A0582014-06-0202 June 2014 5/14/2014 Summary of Meeting with Arizona Public Service Company to Discuss Flooding Hazard Reevaluation Extension Request for Palo Verde, Units 1, 2, and 3; Near-Term Task Force Recommendation 2.1 ML14099A4692014-04-21021 April 2014 Summary of 4/2/2014 Pre-Application Meeting with Arizona Public Service Company to Discuss Extension of Authorized Repair to Palo Verde, Unit 3, Bottom Mounted Instrumentation to End-of-Unit Life ML13333B5742013-12-0505 December 2013 Summary of 11/1/2013 Conference Call Regarding the Fall 2013 Steam Generator Tube Inspections ML13330A5732013-12-0505 December 2013 Verbal Authorization of Relief Request 51, Alternative to ASME Code for Flaw Removal, Reactor Vessel Bottom-mounted Instrumentation Nozzle, Third 10-Year ISI Interval ML13312A5402013-11-18018 November 2013 11/5/2013 Summary of Preapplication Meeting to Discuss License Amendment Request to Incorporate Nuclear Energy Institute NEI-11-04 Quality Assurance Program at Palo Verde, Units 1, 2, and 3 ML13311B1832013-11-18018 November 2013 Summary of Meeting with Arizona Public Service Company to Discuss Non-destructive Examination Efforts, Repairs, and Progress on Root Cause Identified During Inspection of Bottom-Mounted Instrumentation Nozzles at Palo Verde, Unit 3 ML13234A0052013-08-26026 August 2013 8/21/2013 - Summary of Preapplication Meeting with Arizona Public Service Company Low Pressure Safety Injection Pump Single Failure Analysis for Minimum Required Refueling Water Tank Transfer Volume at Palo Verde, Units 1, 2, and 3 ML13203A0852013-08-0505 August 2013 Summary of Preapplication Meeting with Arizona Public Service Company to Discuss License Amendment Request Related to the Startup Test Activity Reduction Program at Palo Verde, Units 1, 2, and 3 (TAC Nos. MF1932-MF1934) ML13154A4502013-06-26026 June 2013 Summary of Meeting Via Conference Call with Arizona Public Service Co. to Discuss Palo Verde Request to Revise Technical Specifications; Eliminate Use of the Term Core Alteration Consistent w/TSTF-471 and NUREG-1432, Rev 3 (TAC ME8160-ME816 ML13161A2522013-06-26026 June 2013 Summary of Conference Call with Arizona Public Service Company to Discuss Draft Requests for Additional Information for Palo Verde, Units 1, 2, and 3 NRC Order Number EA-12-049 Related to Mitigation Strategies (TAC Nos. MF0829-MF0831) ML13154A4322013-06-13013 June 2013 5/30/13 Summary of Conference Call with Arizona Public Service Company to Discuss Draft Requests for Additional Information for Palo Verde, Units 1, 2, and 3 NRC Order Number EA-12-049 Related to Mitigation Strategies (TAC Nos. MF0829-MF083 ML12244A2152012-09-20020 September 2012 8/30/2012 Summary of Meeting with Arizona Public Service Company to Discuss Relief Request 48 - Alternative to ASME Section III, Phased Array Ultrasonic Examination Techniques for Palo Verde, Units 1, 2, and 3 ML12157A2722012-06-11011 June 2012 5/31/2012 Summary of Telephone Conference with Licensees Regarding Near Term Task Force Recommendation 2.1 Seismic Reevaluations - Diablo Canyon, 1 and 2, San Onofre, Units 2 and 3, Columbia Generating Station, and Palo Verde, Units 1, 2, a ML1115704912011-06-0202 June 2011 Meeting Summary for Public Meeting with Arizona Public Service to Discuss the Performance Results for Palo Verde, Units 1, 2 and 3 for the Period of January 1 Through December 31, 2010 ML1111900662011-04-29029 April 2011 3/27/11 Correction to Summary of Pre-Licensing Meeting with Arizona Public Service Company to Discuss Potential Submittal to Revise Technical Specification 3.7.4, Atmospheric Dump Valves, for Palo Verde, Units 1, 2, and 3 (TAC Nos. ME5233-M 2023-09-27
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 September 9, 2015 LICENSEE: Arizona Public Service Company FACILITY: Palo Verde Nuclear Generating Station, Units 1, 2, and 3
SUBJECT:
SUMMARY
OF JUNE 10, 2015, MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING THE ONGOING RESOLUTION OF GENERIC LETTER 2004-02 FOR PALO VERDE NUCLEAR GENERATING STATION, UNITS 1, 2, AND 3 (TAC NOS. MC4702, MC4703, and MC4704)
On June 10, 2015, the U.S. Nuclear Regulatory Commission (NRC) staff hosted a Category 1 public meeting conference call with staff from Arizona Public Service Company (APS, the licensee) at NRC Headquarters, One White Flint North, 11555 Rockville Pike, Rockville, Maryland. The purpose of this meeting was to discuss the recent insulation discovery and resolution options relating to Generic Letter (GL) 2004-02, "Potential Impact of Debris Blockage on Emergency Recirculation during Design Basis Accidents at Pressurized-Water Reactors," for Palo Verde Nuclear Generating Station (PVNGS), Units 1, 2, and 3. The meeting notice and agenda, dated May 28, 2015 are available in the Agencywide Documents Access and
- Management System (ADAMS) at Accession No. ML15149A033. The licensee provided presentation slides, which are available at ADAMS Accession No. ML15156B352. The enclosure contains the meeting attendance list.
The licensee presented an overview of the recent insulation discovery and provided information regarding resolution of GL 2004-02 for PVNGS. On December 18, 2013, APS submitted Revision 2 to the supplemental response to GL 2004-02 (ADAMS Accession No. ML 13357~218). On April 15, 2015, APS entered into its corrective action program its failure to identify and evaluate microtherm on the reactor vessel. The microtherm was discovered in several locations on the reactor vessel, including an approximately 10 foot band encompassing the hot and cold leg elevation, during an unrelated review of plant drawings. The licensee confirmed that the insulation is assumed to be the same on all three units at PVNGS. The licensee stated microtherm was previously removed on the reactor vessel head; however, the recently identified microtherm is at different locations. The licensee discussed the possible reactor vessel microtherm break locations and identified the hot leg nozzle off the steam generator as the most limiting break location. The NRC staff noted that the breaks that could result in damage to the insulation are within the region of the reactor annulus. The staff also noted that the locations of the breaks may be restrained, which would result in smaller damage zones than fully separated breaks.
The licensee compared the latent and additional fiber for the limiting break location and the microtherm break location. The licensee stated that APS likely has not performed extensive plant-specific tests but noted that industry testing indicated that the microtherm will block flow if a fiber bed is present on the strainer, and in the absence of fiber, microtherm will act as a particulate and flow through open strainer areas. The licensee then discussed the pocket
strainer configuration at PVNGS and the results of sump strainer performance testing. The NRC staff asked if the results from the strainer testing resulted in bare strainer area. The licensee stated the results were based on net positive suction head, not open strainer area.
The licensee stated APS would include more information regarding the potential effects of microtherm debris in a future submittal. The NRC staff noted that Beaver. Valley Power Station had a similar microtherm situation and suggested APS look at the response to NRC's request for information dated September 28, 2010 (ADAMS Accession No. ML102770023).
The NRC staff suggested that it would be beneficial if the cause for the oversight was shared with industry so that other licensees could ensure that similar issues had not occurred at t.heir facilities.
APS presented three potential outcomes for a path forward to resolve GL 2004-02. The first outcome is to demonstrate the reactor vessel break is not limiting with respect to ECCS strainer performance in order to determine if the current submittal is still bounding. The second outcome is to remove the insulation. The third outcome is to justify the current configuration using a risk-informed approach or further evaluation and testing. APS stated that a third-party vendor will evaluate the potential effects of the newly discovered microtherm insulation. After further analysis, APS would like to schedule another public meeting to discuss the resolution of GL 2004-02, including a revised supplemental response.
The NRC did not receive any public meeting feedback forms and there were no comments from the public.
If you have any questions, please contact me at (301) 415-1233 or via e-mail at Margaret.Watford@nrc.gov.
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Margaret M. Watford, Project Manager Plant Licensing Branch IV-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. STN 50-529
Enclosure:
As stated cc w/encl: Distribution via Listserv
LIST OF ATTENDEES JUNE 10, 2015. PUBLIC MEETING WITH ARIZONA PUBLIC SERVICE COMPANY REGARDING ONGOING RESOLUTION OF GL 2004-02
. PALO VERDE. UNITS 1. 2. AND 3 Name Affiliation Margaret Watford NRC Victor Cusumano NRC Matthew Yoder NRC Stephen Smith NRC John Stang NRC Paul Klein NRC Marioly Diaz NRC Lindsay Robinson NRC Andrea Russell NRC Thomas Weber APS Mark McGhee APS Michael Dilorenzo APS Don Vogt APS Domenic Macedonia APS Carl Stafford APS Jenny Tolar APS Jorge Rodriguez APS Delbert Elkington APS Megan Stachowiak Ali on Andrew Roudenko Ali on Bruce Letelliar Ali on Enclosure
ML152398322 *concurrence via email OFFICE NRR/DORL/LPL4-1 /PM NRR/DORL/LPL4-1 /LA NRR/DE/ESGB/BC NAME MWatford JBurkhardt (KGoldstein'for) GKulesa*
DATE 08/27/15 08/27/15 08/31/15 OFFICE NRR/DSS/SSIB NRR/DORL/LPL4-1 /BC NRR/DORL/LPL4-1 /PM NAME VCusumano* MMarkley MWatford DATE 08/28/15 9/9/15 9/9/15