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| {{#Wiki_filter:PVNGS License Renewal Application Metal Fatigue Topics April 1, 2010 Discussion Topics*Historical and general background*Metal Fatigue Monitoring Program | | {{#Wiki_filter:PVNGS License Renewal Application Metal Fatigue Topics April 1, 2010 |
| *Cycle Counting Questions
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| *Class 1 Fatigue TLAA Evaluation Process*Future actions
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| *NRC staff questions Historical and general background Initial development of PVNGS metal fatigue monitoring program*Program required by PVNGS Technical Specification 5.5.5*SYS80-PE-DE "Compilation of NSSS Responses to Design Bases Dynamic
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| Events for the System 80 Standard Design" established applicable design cycles and their 40-year expected accumulation*Class I metal fatigue analyses incorporated the SYS80-PE-DE limits and in some cases identified additional items of concern Initial development of PVNGS metal fatigue monitoring program*The initial Technical Specification program did not require all UFSAR
| | Discussion Topics |
| | * Historical and general background |
| | * Metal Fatigue Monitoring Program |
| | * Cycle Counting Questions |
| | * Class 1 Fatigue TLAA Evaluation Process |
| | * Future actions |
| | * NRC staff questions |
|
| |
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| transients to be monitored*The UFSAR does not incorporate all of the additional limits (e.g. RCP stud tensioning/de-tensioning) -to be
| | Historical and general background |
|
| |
|
| discussed later in this presentation
| | Initial development of PVNGS metal fatigue monitoring program |
| *PV staff identified that not all UFSAR transients were being counted *Implemented expanded list of transients in January 1996*ITS upgrade in 1998 established current requirements*Not counted data between '85 and '95 was assumed to be an accumulation of 25% of the design allowed transients in all but a few casesProgram Review -1995 | | * Program required by PVNGS Technical Specification 5.5.5 |
| *Actual event counting has been in place since January 1996*Unit 1, 2 and 3 records have now been reviewed for LRA support Performance of cycle counting since January 1996 Metal Fatigue Monitoring Program | | * SYS80-PE-DE Compilation of NSSS Responses to Design Bases Dynamic Events for the System 80 Standard Design established applicable design cycles and their 40-year expected accumulation |
| *Current methodology:-Cycle counting to ensure design assumptions are not exceeded-Specific component locations are not specified-Exception: Partial cycle (CBF-PC) methodology is used to track spray nozzle
| | * Class I metal fatigue analyses incorporated the SYS80-PE-DE limits and in some cases identified additional items of concern |
|
| |
|
| usage Current PVNGS Metal Fatigue Monitoring Program
| | Initial development of PVNGS metal fatigue monitoring program |
| *LRA development prompted PVNGS staff to revisit the assumptions for 1985 -1995*Recounts of all three units were reported in the response to RAI B3.1-4 (see RAI response Table 3.1-4)-Recount Methodology*Best source selected (logs, MORs, LERs, WOs, interviews)*Validated assumptions Addressing Cycle Count Assumptions | | * The initial Technical Specification program did not require all UFSAR transients to be monitored |
| *Recount Methodology-Best source selected (logs, MORs, LERs, WOs, interviews)-Reviewed assumption of 25% accumulated cycles*Actual data*Comparison to '95 -'05 operating history Cycle Recount
| | * The UFSAR does not incorporate all of the additional limits (e.g. RCP stud tensioning/de-tensioning) - to be discussed later in this presentation |
| *Required by 10 CFR54.21 (c)(1)(iii)*Scope -All Class I components *Methodology:-Based on component locations-Adds SBF for high usage locations (not discussed in this presentation)-Continues cycle counting for "Global"monitoring*Used for low 40-year design CUF*No new industry issues since original design*Industry experience indicates not a problem location-Expands CUF monitoring*CBF-C (CUF based on design cycle)*CBF-PC (CUF based on partial cycle)*CBF-EP (CUF based on event pairing)-Establishes appropriate action limits and corrective actions Enhanced Metal Fatigue Monitoring Program
| |
| *SBF methodology (to be determined)*FatiguePro is under evaluation for cycle counting and CBF monitoring*Current manual cycle counting will continue until a suitable software program has been
| |
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| validated*Enhanced program will be implemented no later than two years prior to the PEO (LRA commitment #39 as revised in Amendment 9)Enhanced Program Status Cycle Counting NRC Questions Cycle Counting RAIs and Amendments*Amendment 3 (annual update)-Added Unit 3 record review results and revised one transient total to replace an
| | Program Review - 1995 |
| | * PV staff identified that not all UFSAR transients were being counted |
| | * Implemented expanded list of transients in January 1996 |
| | * ITS upgrade in 1998 established current requirements |
| | * Not counted data between 85 and 95 was assumed to be an accumulation of 25% of the design allowed transients in all but a few cases |
|
| |
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| estimate with data-Revised current program action limit discussion to avoid confusion with the
| | Performance of cycle counting since January 1996 |
| | * Actual event counting has been in place since January 1996 |
| | * Unit 1, 2 and 3 records have now been reviewed for LRA support |
|
| |
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| enhanced program limits-Minor clarifications were included in the AMP OE discussion Cycle Counting RAIs and Amendments (continued)*Amendment 9 (result of RAI B3.1-1 thru 8)-RAI B3.1-4 response provided the individual unit cycle totals from best available sources-Corrected typographical errors
| | Metal Fatigue Monitoring Program |
| -Included enhanced monitoring implementation schedule-Committed to selection of a suitable SBF methodology-Clarified cycle projection methodology Cycle Counting RAIs and Amendments (continued)
| |
| Most recent cycle count related DRAI set (DRAI 4.3-1 thru 9-DRAI 4.3-1 Transients projected to exceed 40-year limits*Projections are conservative and may not be reached*10CFR54.21(c)(1)(iii) permits aging management for TLAAs that are not validated or projected for the PEO*NUREG 1800 paragraph 4.3.3.1.1.
| |
| 3 permits the use of GALL programs for aging management*NUREG 1801 Vol2 AMP X.M1 allo ws use of this program to manage aging and recommends "no further evaluation"if this program is selected to satisfy 10CFR54.21(c)(1)(iii)*PVNGS took no exceptions to X.M1 and concludes fatigue reanalyses are not required bas ed on projections . Corrective action will be initiated if needed based on program action limits Cycle Counting RAIs and Amendments (continued)*DRAI 4.3-1 LRA Transient projection methodology-Presented for information only -Concept of a worst case bounding unit
| |
| -Conservative Assumptions*Highest unit total was used for '85-'95 and for '95-'05*Lowest operating years was used for accumulation rate*42 years were used for projecting and added to above*'Zero accumulation'assumed to be linear times 22/40-If not expected still assumed 1 event Cycle Counting RAIs and Amendments (continued)*DRAI 4.3-2 Global monitoring criteria does not seem consistent-Exceptions are explained in LRA table notes*DRAI 4.3-3 Clarify the CBF-PC method
| |
| *DRAI 4.3-4 Program action limits (see commitment #39)
| |
| *DRAI 4.3-5 Some cycles do not agree with the UFSAR-Some are derived from UFSAR sections other than 3.9.1-Some come from specific analyses (e.g. RCP studs)-Addition of cycles to the UFSAR is under consideration Cycle Counting RAIs and Amendments (continued)*DRAI 4.3-6 25% cycle assumption-Review of best source data was presented in the response to RAI B3.1-4-Compared assumption to actual data from recount efforts or data from '95-'05-Result:*Four assumptions of 25% cycle accumulation are being reviewed: Rx Trip, Load Reject, Turbine Trip w/o Rx
| |
|
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| Trip and Depressurization by MSSV at 100% power*Remaining 25 % assumptions are conservative Cycle Counting RAIs and Amendments (continued)*DRAI 4.3-7 Not all cycles were recounted-Some had accurate data and did not require recount-Some were not significant (e.g. plant loading at 5%/min)-Some could not be recovered so the 25%
| | Current PVNGS Metal Fatigue Monitoring Program |
| assumption was used and validated from '95-
| | * Current methodology: |
| | - Cycle counting to ensure design assumptions are not exceeded |
| | - Specific component locations are not specified |
| | - Exception: Partial cycle (CBF-PC) methodology is used to track spray nozzle usage |
|
| |
|
| '05 data Cycle Counting RAIs and Amendments (continued)*DRAI 4.3-8 Questioned an incorrect table note (had been corrected in Amendment
| | Addressing Cycle Count Assumptions |
| | * LRA development prompted PVNGS staff to revisit the assumptions for 1985 - 1995 |
| | * Recounts of all three units were reported in the response to RAI B3.1-4 (see RAI response Table 3.1-4) |
| | - Recount Methodology |
| | * Best source selected (logs, MORs, LERs, WOs, interviews) |
| | * Validated assumptions |
|
| |
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| 9)*DRAI 4.3-9 Some cycles are not included in the UFSAR (similar to DRAI 4.3-5)-Some come from specific analyses (e.g. RCP studs)-Addition of cycles to the UFSAR is under consideration Class 1 Fatigue TLAA Evaluation Process -LRA Section 4.3.2
| | Cycle Recount |
| *Identify TLAAs and Affected Components-SRP Guidance, Industry Experience, CLB Search*Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB)*Evaluate and Summarize CDB TLAAs-Analysis Results -Analyzed Locations, CUFs, etc. | | * Recount Methodology |
| -Effects of Modification, Analysis, and Op. History
| | - Best source selected (logs, MORs, LERs, WOs, interviews) |
| -Effects of Differences in Analysis Methods-Identify Disposition Class 1 Fatigue TLAA Evaluation Process
| | - Reviewed assumption of 25% accumulated cycles |
| *SRP Guidance-NUREG-1800 Sect. 4.3 and Tables for Class 1-Based on ASME III Subsection NB and NG and Industry Experience*Industry Experience-Examples:-Other LRAs-NRC and NSSS vendor Bulletins, Notices, etc.*CLB Search-Word Search of CLB (FSAR, Docketed Reports, Letters, etc.)-Confirm applicability to Palo Verde-Identify other plant-specific TLAAs Identify TLAAs and Affected Component s
| | * Actual data |
| *Research and Summarize History of CLB-Confirm Current Licensing Basis*Research Design and Analysis History-Confirm Current Design Basis-TLAAs are analyses , are therefore part of the CDB-TLAAs are usually bases of the CLB ("incorporated by reference") rather than included verbatim Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB)
| | * Comparison to 95 - 05 operating history |
| *Analysis Results-All TLAA Results (e.g., all reported fatigue summaries)-All Analyzed Locations
| |
| -Tabulated for Complex Components*Effects of Modification, Analysis, and Operating History - | |
| Examples:-Instrument Nozzle Half-Nozzle and MNSA Repairs (Several LRA Sections)-Pressurizer Surge Line Thermal Stratification (LRA Section 4.3.2.9)-Unit 2 Head Vent Repair -high part-life CUF, head replaced Fall 2009 (LRA p. 4.3-34)
| |
| Evaluate and Summarize CDB TLAAs
| |
| *Identify Disposition-Based on Analysis History, Results, and Methods*10 CFR 54.21(c)(1)(i) -If simple design life or cycle ratios, etc., confirm adequate margin at 60 years*10 CFR 54.21(c)(1)(iii) -Used in most other cases-Requires Aging Management*10 CFR 54.21(c)(1)(ii) -Reanalysis performed Evaluate and Summarize CDB TLAAs (Continued)
| |
| *Identify Disposition (Continued)-10 CFR 54.21(c)(1)(iii) monitoring methods are described in LRA 4.3.1, summarized by monitored | |
|
| |
|
| location in Table 4.3-4-Details of 10 CFR 54.21(c)(1)(iii) monitoring methods are location and analysis-specific.
| | Enhanced Metal Fatigue Monitoring Program |
| Examples:*Global -monitor transients *Cycle-based fatigue (CBF) -moni tor transients, possible CUF impacts*Stress-based fatigue (SBF) -i mpact of transients require reevaluation of CUF Evaluate and Summarize CDB TLAAs (Continued)
| | * Required by 10 CFR54.21 (c)(1)(iii) |
| NRC Staff Questions*Have we answered the questions and issues stated in this presentation?*Does the staff have additional questions with respect to cycle counting or the
| | * Scope - All Class I components |
| | * Methodology: |
| | - Based on component locations |
| | - Adds SBF for high usage locations (not discussed in this presentation) |
| | - Continues cycle counting for Global monitoring |
| | * Used for low 40-year design CUF |
| | * No new industry issues since original design |
| | * Industry experience indicates not a problem location |
| | - Expands CUF monitoring |
| | * CBF-C (CUF based on design cycle) |
| | * CBF-PC (CUF based on partial cycle) |
| | * CBF-EP (CUF based on event pairing) |
| | - Establishes appropriate action limits and corrective actions |
|
| |
|
| PVNGS approach to metal fatigue?*Review action items | | Enhanced Program Status |
| *Future topics Thank you for your participation}} | | * SBF methodology (to be determined) |
| | * FatiguePro is under evaluation for cycle counting and CBF monitoring |
| | * Current manual cycle counting will continue until a suitable software program has been validated |
| | * Enhanced program will be implemented no later than two years prior to the PEO (LRA commitment #39 as revised in Amendment 9) |
| | |
| | Cycle Counting NRC Questions Cycle Counting RAIs and Amendments |
| | * Amendment 3 (annual update) |
| | - Added Unit 3 record review results and revised one transient total to replace an estimate with data |
| | - Revised current program action limit discussion to avoid confusion with the enhanced program limits |
| | - Minor clarifications were included in the AMP OE discussion |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * Amendment 9 (result of RAI B3.1-1 thru 8) |
| | - RAI B3.1-4 response provided the individual unit cycle totals from best available sources |
| | - Corrected typographical errors |
| | - Included enhanced monitoring implementation schedule |
| | - Committed to selection of a suitable SBF methodology |
| | - Clarified cycle projection methodology |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | Most recent cycle count related DRAI set (DRAI 4.3-1 thru 9 |
| | - DRAI 4.3-1 Transients projected to exceed 40-year limits |
| | * Projections are conservative and may not be reached |
| | * 10CFR54.21(c)(1)(iii) permits aging management for TLAAs that are not validated or projected for the PEO |
| | * NUREG 1800 paragraph 4.3.3.1.1.3 permits the use of GALL programs for aging management |
| | * NUREG 1801 Vol 2 AMP X.M1 allows use of this program to manage aging and recommends no further evaluation if this program is selected to satisfy 10CFR54.21(c)(1)(iii) |
| | * PVNGS took no exceptions to X.M1 and concludes fatigue reanalyses are not required based on projections . Corrective action will be initiated if needed based on program action limits |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * DRAI 4.3-1 LRA Transient projection methodology |
| | - Presented for information only |
| | - Concept of a worst case bounding unit |
| | - Conservative Assumptions |
| | * Highest unit total was used for 85-95 and for 95-05 |
| | * Lowest operating years was used for accumulation rate |
| | * 42 years were used for projecting and added to above |
| | * Zero accumulation assumed to be linear times 22/40 |
| | - If not expected still assumed 1 event |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * DRAI 4.3-2 Global monitoring criteria does not seem consistent |
| | - Exceptions are explained in LRA table notes |
| | * DRAI 4.3-3 Clarify the CBF-PC method |
| | * DRAI 4.3-4 Program action limits (see commitment #39) |
| | * DRAI 4.3-5 Some cycles do not agree with the UFSAR |
| | - Some are derived from UFSAR sections other than 3.9.1 |
| | - Some come from specific analyses (e.g. RCP studs) |
| | - Addition of cycles to the UFSAR is under consideration |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * DRAI 4.3-6 25% cycle assumption |
| | - Review of best source data was presented in the response to RAI B3.1-4 |
| | - Compared assumption to actual data from recount efforts or data from 95-05 |
| | - Result: |
| | * Four assumptions of 25% cycle accumulation are being reviewed: Rx Trip, Load Reject, Turbine Trip w/o Rx Trip and Depressurization by MSSV at 100% power |
| | * Remaining 25 % assumptions are conservative |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * DRAI 4.3-7 Not all cycles were recounted |
| | - Some had accurate data and did not require recount |
| | - Some were not significant (e.g. plant loading at 5%/min) |
| | - Some could not be recovered so the 25% |
| | assumption was used and validated from 95-05 data |
| | |
| | Cycle Counting RAIs and Amendments (continued) |
| | * DRAI 4.3-8 Questioned an incorrect table note (had been corrected in Amendment 9) |
| | * DRAI 4.3-9 Some cycles are not included in the UFSAR (similar to DRAI 4.3-5) |
| | - Some come from specific analyses (e.g. RCP studs) |
| | - Addition of cycles to the UFSAR is under consideration |
| | |
| | Class 1 Fatigue TLAA Evaluation Process - LRA Section 4.3.2 |
| | |
| | Class 1 Fatigue TLAA Evaluation Process |
| | * Identify TLAAs and Affected Components |
| | - SRP Guidance, Industry Experience, CLB Search |
| | * Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB) |
| | * Evaluate and Summarize CDB TLAAs |
| | - Analysis Results - Analyzed Locations, CUFs, etc. |
| | - Effects of Modification, Analysis, and Op. History |
| | - Effects of Differences in Analysis Methods |
| | - Identify Disposition |
| | |
| | Identify TLAAs and Affected Components |
| | * SRP Guidance |
| | - NUREG-1800 Sect. 4.3 and Tables for Class 1 |
| | - Based on ASME III Subsection NB and NG and Industry Experience |
| | * Industry Experience - Examples: |
| | - Other LRAs |
| | - NRC and NSSS vendor Bulletins, Notices, etc. |
| | * CLB Search |
| | - Word Search of CLB (FSAR, Docketed Reports, Letters, etc.) |
| | - Confirm applicability to Palo Verde |
| | - Identify other plant-specific TLAAs |
| | |
| | Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB) |
| | * Research and Summarize History of CLB |
| | - Confirm Current Licensing Basis |
| | * Research Design and Analysis History |
| | - Confirm Current Design Basis |
| | - TLAAs are analyses, are therefore part of the CDB |
| | - TLAAs are usually bases of the CLB (incorporated by reference) rather than included verbatim |
| | |
| | Evaluate and Summarize CDB TLAAs |
| | * Analysis Results |
| | - All TLAA Results (e.g., all reported fatigue summaries) |
| | - All Analyzed Locations |
| | - Tabulated for Complex Components |
| | * Effects of Modification, Analysis, and Operating History - Examples: |
| | - Instrument Nozzle Half-Nozzle and MNSA Repairs (Several LRA Sections) |
| | - Pressurizer Surge Line Thermal Stratification (LRA Section 4.3.2.9) |
| | - Unit 2 Head Vent Repair - high part-life CUF, head replaced Fall 2009 (LRA p. 4.3-34) |
| | |
| | Evaluate and Summarize CDB TLAAs (Continued) |
| | * Identify Disposition |
| | - Based on Analysis History, Results, and Methods |
| | * 10 CFR 54.21(c)(1)(i) - If simple design life or cycle ratios, etc., |
| | confirm adequate margin at 60 years |
| | * 10 CFR 54.21(c)(1)(iii) - Used in most other cases |
| | - Requires Aging Management |
| | * 10 CFR 54.21(c)(1)(ii) - Reanalysis performed |
| | |
| | Evaluate and Summarize CDB TLAAs (Continued) |
| | * Identify Disposition (Continued) |
| | - 10 CFR 54.21(c)(1)(iii) monitoring methods are described in LRA 4.3.1, summarized by monitored location in Table 4.3-4 |
| | - Details of 10 CFR 54.21(c)(1)(iii) monitoring methods are location and analysis-specific. Examples: |
| | * Global - monitor transients |
| | * Cycle-based fatigue (CBF) - monitor transients, possible CUF impacts |
| | * Stress-based fatigue (SBF) - impact of transients require reevaluation of CUF |
| | |
| | NRC Staff Questions |
| | * Have we answered the questions and issues stated in this presentation? |
| | * Does the staff have additional questions with respect to cycle counting or the PVNGS approach to metal fatigue? |
| | * Review action items |
| | * Future topics Thank you for your participation}} |
Letter Sequence Other |
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MONTHYEARML0925906132009-09-30030 September 2009
Plan for the Scoping and Screening Methodology Regulatory Audit Regarding the Palo Verde Nuclear Generating Station, Units 1, 2, and 3 License Renewal Application Review (TAC Nos. ME0254 - ME0256)
Project stage: Other
ML0927405912009-09-30030 September 2009
E-mail Nrr/De/Eeeb Concerning Review of Palo Verde License Renewal - No RAI
Project stage: Approval
ML0927502372009-11-0303 November 2009
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
Project stage: RAI
ML0928900112009-11-12012 November 2009
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
Project stage: RAI
ML0930902462009-11-18018 November 2009
Plan for the Aging Management Program Audit Regarding the Palo Verde Nuclear Generating Station, Units 1, 2, & 3 License Renewal Application Review (TAC Nos. ME0254, ME0255, ME0256)
Project stage: Other
ML0932004132009-12-0404 December 2009
Correction to Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
Project stage: RAI
ML1015302192009-12-16016 December 2009
APS 2004 Pump Installation Completion Report for PVNGS Firing Range Well. Filed with Adwr on Aug. 3, 2004 (PV-406) PVNGS
Project stage: Request
ML0933800512009-12-23023 December 2009
Request for Additional Information, License Renewal Application
Project stage: RAI
ML0934908302009-12-29029 December 2009
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application)
Project stage: RAI
ML1002702902010-01-13013 January 2010
Follow-up Clarification to the Response to September 30, 2009, RAI Regarding Severe Accident Mitigation Alternatives for the Review of the PVNGS License Renewal Application, Amendment No. 7
Project stage: Supplement
ML0932902982010-01-14014 January 2010
RAI for the Review of the PVNGS Units 1, 2, and 3, License Renewal Application
Project stage: RAI
ML1001503782010-01-28028 January 2010
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TAC Nos. ME0254, ME0255, ME0256)
Project stage: RAI
ML1002700692010-02-19019 February 2010
RAI for the Review of the Palo Verde Nuclear Generating Station Units 1, 2, 3, LRA (Tac Nos. ME0254, ME0255, & ME0256)
Project stage: RAI
ML1006106042010-02-19019 February 2010
Response to December 29, 2009, Request for Additional Information Regarding Aging Management Program Audit for Review of License Renewal Application Amendment No. 9
Project stage: Request
ML1003602962010-03-0202 March 2010
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TAC Nos. ME0254, ME0255, and ME0256)
Project stage: RAI
ML1001506182010-03-12012 March 2010
Summary of Telephone Conference Call Held Between NRC and Arizona Public Service Company, Concerning Containment Coatings Pertaining to the Palo Verde, Units 1, 2, and 3, LRA
Project stage: Other
ML1013802152010-04-0101 April 2010
License Renewal - April 1 Webinar on Metal Fatigue Arizona Public Service Company Presentation Slides
Project stage: Other
ML1002212962010-04-0707 April 2010
Audit Report Regarding the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TAC Nos. ME0254, ME0255, ME0256)
Project stage: Other
ML1009603672010-04-0808 April 2010
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TAC Nos. ME0254, ME0255, and ME0256)
Project stage: RAI
ML1009804822010-04-20020 April 2010
05/06/10 Notice of Public Working Meeting with Arizona Public Service to Discuss Issues Related to the Palo Verde Nuclear Generating Station License Renewal Application
Project stage: Meeting
ML1011603572010-04-28028 April 2010
Request for Additional Information - Palo Verde License Renewal Review
Project stage: RAI
ML1013102272010-04-29029 April 2010
Response to April 8, 2010, Request for Additional Information Regarding Security Assessments, for the Review of the PVNGS License Renewal Application
Project stage: Request
ML1013401002010-06-0202 June 2010
License Renewal - Request for Additional Information Concerning Metal Fatigue
Project stage: RAI
ML1012703882010-06-25025 June 2010
License Renewal - May 6, 2010 Public Meeting - Arizona Public Service Handout
Project stage: Meeting
ML1013408012010-06-25025 June 2010
License Renewal - May 6, 2010 Public Meeting Summary
Project stage: Meeting
ML1013702892010-07-0606 July 2010
Summary of Tele Conf Call Held on 4/23/10, Between the USNRC and Arizona Public Service, Concerning the Palo Verde Generating Nuclear Station, Units 1, 2, and 3, License Renewal Application
Project stage: Other
ML1017402172010-07-13013 July 2010
Scoping and Screening Audit Report for the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TACs ME0254, ME0255, and ME0256)
Project stage: Other
ML1013408292010-07-14014 July 2010
License Renewal - Summary of Conference Calls on Metal Fatigue
Project stage: Other
ML1018908912010-07-21021 July 2010
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application
Project stage: RAI
ML1021504162010-08-0606 August 2010
Letter - Palo Verde License Renewal - Transmittal Letter with Safety Evaluation Report with Open Items to Arizona Public Service Company
Project stage: Approval
ML1023102542010-08-24024 August 2010
Forthcoming Meeting to Discuss the Draft Supplemental Environmental Impact Statement (Dseis) for Palo Verde Nuclear Generating Station
ML1021801672010-08-31031 August 2010
NUREG-1437 Supplement 43, Dfc Generic Environmental Impact Statement for License Renewal of Nuclear Plants Regarding Palo Verde Nuclear Generating Station (Draft for Comment)
Project stage: Draft Other
ML1025600222010-09-27027 September 2010
Request for Additional Information for the Review of the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal Application (TAC Nos. ME0254, ME0255, and ME0256)
Project stage: RAI
ML1020305002010-10-15015 October 2010
Summary of Tele Conf Call Held on 7/21/10, Btw the USNRC and Arizona Public Service Company, Concerning Draft Request for Additional Information Pertaining to the Palo Verde Nuclear Generating Station, Units 1, 2, and 3, License Renewal App
Project stage: Draft RAI
ML1034909162011-01-11011 January 2011
Safety Evaluation Report Related to the License Renewal of Palo Verde Nuclear Generating Station, Units 1, 2, and 3 (Tac Nos. ME0254, ME0255, ME0256)
Project stage: Approval
ML1104905402011-03-0303 March 2011
Correction of Typographical Error in Safety Evaluation Report Related to License Renewal (TAC Nos. ME0254, ME0255, and ME0256)
Project stage: Approval
ML1108719552011-04-21021 April 2011
License Renewal - Appendices a, B, C, and D to the Renewed Operating License for Unit 1 (NPF-41)
Project stage: Acceptance Review
ML1108004782011-04-21021 April 2011
Notice of Issuance of Renewed Facility Operating License Nos. NPF-41, NPF-51, NPF-74 for Additional 20-Year Period - FRN
Project stage: Request
ML1108004552011-04-21021 April 2011
Issuance of Renewed Facility Operating Licenses for Palo Verde Nuclear Generating Station (TAC Numbers ME0254, ME0255, and ME0256)
Project stage: Approval
2010-04-20
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Category:Meeting Briefing Package/Handouts
MONTHYEARML24262A1052024-09-20020 September 2024
Pre-Submittal Presentation Slides - 1R25 Pzr Nozzle Life of Repair - Relief Request 73 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3
ML24236A7032024-08-22022 August 2024
Pre-Submittal Meeting Slides to Support August 29, 2024 Aps/Westinghouse Thermal Design Procedure (Wtdp) Meeting
ML24212A3392024-08-0101 August 2024
August 1, 2024, Public Meeting on Potential Palisades Nuclear Plant Restart Presentation
ML24192A3262024-07-12012 July 2024
Licensee Slides to Support Pre-Submittal Meeting – Relief Request 71 Slides
ML24192A3402024-07-12012 July 2024
Licensee to Support Pre-Submittal Meeting - Relief Request 72 Slides
ML24275A2332024-06-28028 June 2024
APS Slides Supporting Preapplication Meeting Regarding Safety Injection Tank Pressure Band
ML24155A2112024-06-0707 June 2024
VRR-02: Exercise Test Frequency Reduction (Slides)
ML24155A2122024-06-0707 June 2024
VRR-03: SOV Test Criteria (Slides)
ML24038A1742024-02-0707 February 2024
Pre-submittal Meeting Slides
ML24019A1512024-01-22022 January 2024
Slides - Modification of Browns Ferry Technical Specifications to Eliminate LCO 3.3.2.1 Actions C.2.1.1 and C.2.1.2 for Rod Worth
ML24003A8532024-01-0303 January 2024
January 4, 2024 Presubmittal Meeting Presentation-Risk Informed Process for Evaluations (RIPE) License Amendment Request for Safety Injection Tank (SIT) LCO (EPID: L?2023?LRM-0108)
ML23240A3232023-08-31031 August 2023
APS Presentation Slides for Pre-Submittal Meeting on 8/31/23, Alloy-600 Management Program Plan
ML23192A0102023-07-11011 July 2023
NRC RIPE 7-11-23 Public Meeting Presentation Slides
ML23144A0252023-05-25025 May 2023
APS Presentation Slides for Pre-Submittal Meeting on 5/25/23, Przr Surge Line
ML23093A0252023-04-30030 April 2023
April 5, 2023, Presubmittal Meeting Presentation - Containment Temperature and Safety Injection Tank Volume Requirements LAR
ML23090A1392023-04-0404 April 2023
April 4, 2023 Presubmittal Meeting Presentation - LAR to Adopt TSTF-266, Eliminate the Remote Shutdown System Table of Instrumentation and Controls (EPID: L?2023?LRM-0017)
ML23055B0572023-03-0101 March 2023
March 1, 2023 Presubmittal Meeting Presentation - Request for Use of Mururoa V4F1 and MTH2 Supplied Air Suits (EPID: L?2023?LRM-0012)
ML22096A0052022-04-0606 April 2022
TSTF-487 LAR Pre-submittal Public Meeting Presentation Slides
ML22025A0012022-01-25025 January 2022
1/25/22 Pre-submittal Meeting Presentation Slides for RR-69 to Extend Containment Tendon Inspection by Three Months Beyond 2/8/22
ML21342A0502021-12-0808 December 2021
TSTF-567 LAR Pre-submittal Public Meeting Presentation Slides
ML21320A1032021-11-17017 November 2021
RIPE Exemption 11-17-21 Pre-submittal Public Meeting Presentation Slides
ML21194A2502021-08-10010 August 2021
RIC 2021 - Ai EPRI-Artificial Intelligence and Development at EPRI
ML21131A0132021-05-13013 May 2021
License Transfer from Pnm to SRP, 5-13-21 Pre-submittal Public Meeting Presentation Slides
ML21025A0032021-01-26026 January 2021
Risk-Informed Process for Evaluations (RIPE) - NEI Public Meeting Presentation Slides
ML21025A0042021-01-25025 January 2021
Risk-Informed Process for Evaluations (RIPE) - NRC Public Meeting Presentation Slides
ML20171A2352020-06-24024 June 2020
Inservice Testing - Supplemental Position Indication Relief Request - NRC Pre-Application Meeting - June 24, 2020
ML19192A0972019-07-11011 July 2019
License Amendment Request for Emergency Plan, July 11, 2019
ML18299A0722018-09-26026 September 2018
Ionizing Radiation Factsheet-Veterans - Information for Veterans and Their Families
ML17320A1932017-11-15015 November 2017
NRC Public Meeting, Treatment of Mitigating Strategies in Risk Informed Decision Making
ML17003A0332016-12-29029 December 2016
Enclosure 2 - APS Meeting Slides
ML16357A6872016-12-20020 December 2016
One-Time License Amendment Request Unit 3 Train B Diesel Generator
ML17003A0862016-11-0303 November 2016
Enclosure 2 Slides Regulatory Audit Report for November 2-3, 2016
ML16253A4112016-09-0707 September 2016
Palo Verde Nuclear Generating Station Generic Letter 2004-02 - September 7, 2016
ML16083A4722016-03-24024 March 2016
NRC Subsequent Pre-Submittal Meeting Next Generation Fuel - Palo Verde, Units 1, 2, and 3
ML16014A1102016-01-20020 January 2016
Draft APS Slides for January 20, 2015, Public Meeting with APS Regarding Upcoming Next Generation Fuel License Amendment Request for Palo Verde, Units 1, 2, and 3
ML15244B2632015-08-27027 August 2015
Slides for Public Meeting with Arizona Public Service Company to Discuss License Amendment Request for Palo Verde Regarding Revised Methodology for Spent Fuel Pool Criticality Analysis
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
ML15159B2972015-06-0909 June 2015
Near-Term Task Force Recommendation 2.1 (R2.1) Seismic Hazard Evaluation - Arizona Public Service, Palo Verde Nuclear Generating Station Public Meeting - June 9, 2015
ML15156B3312015-06-0909 June 2015
Public Meeting Slides on R2.1 Seismic Hazard Re-Evaluation
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
ML15126A2072015-05-11011 May 2015
Presentation Slides for Prelicensing Meeting with Arizon Public Service Company to Discuss License Amendment Request for Palo Verde, Units 1, 2, and 3,
ML15134A3592015-05-11011 May 2015
5/11/2015, Meeting Slide Regarding Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality Analysis
ML15103A2882015-04-0909 April 2015
Presentation on Potential Relief Request About Pressure Boundary Leakage on Reactor Coolant Pump 2A Pipe Nozzle
ML15070A2522015-02-18018 February 2015
Pre-Submittal Public Meeting Final Slides on Risk-Informed Completion Times.
ML15042A4152015-02-11011 February 2015
Pre-Submittal Public Meeting Draft Slides on Risk- Informed Completion Times
ML14184B4112014-06-11011 June 2014
Nrc/Nei/Utility MTG 6/11/14
ML14149A5092014-04-23023 April 2014
4/23/14 Meeting Slide for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 Re. Sig Tube Inspection
ML14098A1832014-04-0202 April 2014
4/2/2014 Meeting Slide for Bottom-Mounted Instrument (Bmi) Relief Request 52 Pre-Submittal Meeting
ML13309A7202013-11-0505 November 2013
Meeting Presentation for November 5, 2013 Public Meeting Regarding Incorporation of NEI 11-04 Into the QA Program at Palo Verde Nuclear Generating Station, Units 1, 2, and 3
ML13308C3402013-11-0404 November 2013
SG Unit 3 Telephone Call
2024-09-20
[Table view]
Category:Slides and Viewgraphs
MONTHYEARML24262A1052024-09-20020 September 2024
Pre-Submittal Presentation Slides - 1R25 Pzr Nozzle Life of Repair - Relief Request 73 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3
ML24236A7032024-08-22022 August 2024
Pre-Submittal Meeting Slides to Support August 29, 2024 Aps/Westinghouse Thermal Design Procedure (Wtdp) Meeting
ML24212A3392024-08-0101 August 2024
August 1, 2024, Public Meeting on Potential Palisades Nuclear Plant Restart Presentation
ML24192A3262024-07-12012 July 2024
Licensee Slides to Support Pre-Submittal Meeting – Relief Request 71 Slides
ML24192A3402024-07-12012 July 2024
Licensee to Support Pre-Submittal Meeting - Relief Request 72 Slides
ML24275A2332024-06-28028 June 2024
APS Slides Supporting Preapplication Meeting Regarding Safety Injection Tank Pressure Band
ML24155A2112024-06-0707 June 2024
VRR-02: Exercise Test Frequency Reduction (Slides)
ML24155A2122024-06-0707 June 2024
VRR-03: SOV Test Criteria (Slides)
ML24038A1742024-02-0707 February 2024
Pre-submittal Meeting Slides
ML24019A1512024-01-22022 January 2024
Slides - Modification of Browns Ferry Technical Specifications to Eliminate LCO 3.3.2.1 Actions C.2.1.1 and C.2.1.2 for Rod Worth
ML24003A8532024-01-0303 January 2024
January 4, 2024 Presubmittal Meeting Presentation-Risk Informed Process for Evaluations (RIPE) License Amendment Request for Safety Injection Tank (SIT) LCO (EPID: L?2023?LRM-0108)
ML23296A0162023-10-20020 October 2023
October 20, 2023 Presubmittal Meeting Presentation - 1R24 Pressurizer Nozzle Repair - RR-70 (EPID: L?2023?LLR-0057)
ML23240A3232023-08-31031 August 2023
APS Presentation Slides for Pre-Submittal Meeting on 8/31/23, Alloy-600 Management Program Plan
ML23192A0102023-07-11011 July 2023
NRC RIPE 7-11-23 Public Meeting Presentation Slides
ML23144A0252023-05-25025 May 2023
APS Presentation Slides for Pre-Submittal Meeting on 5/25/23, Przr Surge Line
ML23093A0252023-04-30030 April 2023
April 5, 2023, Presubmittal Meeting Presentation - Containment Temperature and Safety Injection Tank Volume Requirements LAR
ML23055B0572023-03-0101 March 2023
March 1, 2023 Presubmittal Meeting Presentation - Request for Use of Mururoa V4F1 and MTH2 Supplied Air Suits (EPID: L?2023?LRM-0012)
ML22312A5952022-11-0808 November 2022
Independent Spent Fuel Storage Installation, Submittal of Annual Financial Reports 2021
ML22299A1812022-10-26026 October 2022
Presubmittal Meeting Presentation - License Amendment Request - Adoption of TSTF-107-A Separate Control Rods That Are Untrippable Versus Inoperable and Change to TS 3.1.5 Condition B (EPID: L?2021?LRM-0081)
ML22096A0052022-04-0606 April 2022
TSTF-487 LAR Pre-submittal Public Meeting Presentation Slides
ML22025A0012022-01-25025 January 2022
1/25/22 Pre-submittal Meeting Presentation Slides for RR-69 to Extend Containment Tendon Inspection by Three Months Beyond 2/8/22
ML21342A0502021-12-0808 December 2021
TSTF-567 LAR Pre-submittal Public Meeting Presentation Slides
ML21320A1032021-11-17017 November 2021
RIPE Exemption 11-17-21 Pre-submittal Public Meeting Presentation Slides
ML21278B0912021-10-0606 October 2021
Presubmittal Meeting with Arizona Public Service Company Regarding Relief Request No. 68 for Palo Verde Nuclear Generating Station, Units 1, 2, and 3 (EPID L-2021-LRM-0104) (Slides)
ML21243A5432021-09-0101 September 2021
Request for Partial Exemption from 10 CFR 50.62(c)(1) Risk-Informed Process for Evaluations (RIPE)
ML21194A2502021-08-10010 August 2021
RIC 2021 - Ai EPRI-Artificial Intelligence and Development at EPRI
ML21165A1832021-06-14014 June 2021
RR-67 6-16-21 Pre-Submittal Public Meeting Presentation Slides
ML21130A6462021-05-13013 May 2021
Pre-Submittal Meeting with NRC on May 13, 2021 Application for Transfer of Minority Interests in Palo Verde Nuclear Generating Station, Units 1 and 2 Subject to Expiring Leases
ML21131A0132021-05-13013 May 2021
License Transfer from Pnm to SRP, 5-13-21 Pre-submittal Public Meeting Presentation Slides
ML21055A8502021-02-24024 February 2021
Public Meeting Summary
ML21025A0032021-01-26026 January 2021
Risk-Informed Process for Evaluations (RIPE) - NEI Public Meeting Presentation Slides
ML21025A0042021-01-25025 January 2021
Risk-Informed Process for Evaluations (RIPE) - NRC Public Meeting Presentation Slides
ML21011A2752021-01-0606 January 2021
License Amendment Request (LAR) to Revise Containment Leakage Rate Testing Program Frequencies - NRC Pre-Submittal Meeting, January 6, 2021 (Presentation Slides)
ML20171A2352020-06-24024 June 2020
Inservice Testing - Supplemental Position Indication Relief Request - NRC Pre-Application Meeting - June 24, 2020
ML19060A2982019-03-0101 March 2019
Transmittal of Audit Presentation Slides Regarding License Amendment Request and Exemption Request to Support the Implementation of Framatome CE16HTP Fuel
ML17003A0762017-01-10010 January 2017
Regulatory Audit Report for the November 2-3, 2016, Audit at the Westinghouse Facility in Rockville, MD, for the License Amendment and Exemption Requests Associated with Next Generation Fuel (CAC Nos. MF8076-MF8081)
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
ML17003A0332016-12-29029 December 2016
Enclosure 2 - APS Meeting Slides
ML17003A0862016-11-0303 November 2016
Enclosure 2 Slides Regulatory Audit Report for November 2-3, 2016
ML16253A4112016-09-0707 September 2016
Palo Verde Nuclear Generating Station Generic Letter 2004-02 - September 7, 2016
ML16083A4722016-03-24024 March 2016
NRC Subsequent Pre-Submittal Meeting Next Generation Fuel - Palo Verde, Units 1, 2, and 3
ML16014A1102016-01-20020 January 2016
Draft APS Slides for January 20, 2015, Public Meeting with APS Regarding Upcoming Next Generation Fuel License Amendment Request for Palo Verde, Units 1, 2, and 3
ML15348A0542015-12-15015 December 2015
Slides for December 17, 2015 Public Meeting with APS on Resolution of GL 2004-02
ML15244B2632015-08-27027 August 2015
Slides for Public Meeting with Arizona Public Service Company to Discuss License Amendment Request for Palo Verde Regarding Revised Methodology for Spent Fuel Pool Criticality Analysis
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
ML15159B2972015-06-0909 June 2015
Near-Term Task Force Recommendation 2.1 (R2.1) Seismic Hazard Evaluation - Arizona Public Service, Palo Verde Nuclear Generating Station Public Meeting - June 9, 2015
ML15156B3312015-06-0909 June 2015
Public Meeting Slides on R2.1 Seismic Hazard Re-Evaluation
ML15134A3592015-05-11011 May 2015
5/11/2015, Meeting Slide Regarding Pre-Submittal Meeting for Palo Verde Unit 1, 2, and 3 Updated Spent Fuel Pool Criticality Analysis
ML15126A2072015-05-11011 May 2015
Presentation Slides for Prelicensing Meeting with Arizon Public Service Company to Discuss License Amendment Request for Palo Verde, Units 1, 2, and 3,
ML15103A2882015-04-0909 April 2015
Presentation on Potential Relief Request About Pressure Boundary Leakage on Reactor Coolant Pump 2A Pipe Nozzle
2024-09-20
[Table view] |
Text
PVNGS License Renewal Application Metal Fatigue Topics April 1, 2010
Discussion Topics
- Historical and general background
- Metal Fatigue Monitoring Program
- Class 1 Fatigue TLAA Evaluation Process
Historical and general background
Initial development of PVNGS metal fatigue monitoring program
- SYS80-PE-DE Compilation of NSSS Responses to Design Bases Dynamic Events for the System 80 Standard Design established applicable design cycles and their 40-year expected accumulation
- Class I metal fatigue analyses incorporated the SYS80-PE-DE limits and in some cases identified additional items of concern
Initial development of PVNGS metal fatigue monitoring program
- The initial Technical Specification program did not require all UFSAR transients to be monitored
- The UFSAR does not incorporate all of the additional limits (e.g. RCP stud tensioning/de-tensioning) - to be discussed later in this presentation
Program Review - 1995
- Implemented expanded list of transients in January 1996
- ITS upgrade in 1998 established current requirements
- Not counted data between 85 and 95 was assumed to be an accumulation of 25% of the design allowed transients in all but a few cases
Performance of cycle counting since January 1996
- Actual event counting has been in place since January 1996
- Unit 1, 2 and 3 records have now been reviewed for LRA support
Metal Fatigue Monitoring Program
Current PVNGS Metal Fatigue Monitoring Program
- Cycle counting to ensure design assumptions are not exceeded
- Specific component locations are not specified
- Exception: Partial cycle (CBF-PC) methodology is used to track spray nozzle usage
Addressing Cycle Count Assumptions
- LRA development prompted PVNGS staff to revisit the assumptions for 1985 - 1995
- Recounts of all three units were reported in the response to RAI B3.1-4 (see RAI response Table 3.1-4)
- Recount Methodology
- Best source selected (logs, MORs, LERs, WOs, interviews)
Cycle Recount
- Best source selected (logs, MORs, LERs, WOs, interviews)
- Reviewed assumption of 25% accumulated cycles
- Comparison to 95 - 05 operating history
Enhanced Metal Fatigue Monitoring Program
- Scope - All Class I components
- Based on component locations
- Adds SBF for high usage locations (not discussed in this presentation)
- Continues cycle counting for Global monitoring
- Used for low 40-year design CUF
- No new industry issues since original design
- Industry experience indicates not a problem location
- Expands CUF monitoring
- CBF-C (CUF based on design cycle)
- CBF-PC (CUF based on partial cycle)
- CBF-EP (CUF based on event pairing)
- Establishes appropriate action limits and corrective actions
Enhanced Program Status
- SBF methodology (to be determined)
- FatiguePro is under evaluation for cycle counting and CBF monitoring
- Current manual cycle counting will continue until a suitable software program has been validated
- Enhanced program will be implemented no later than two years prior to the PEO (LRA commitment #39 as revised in Amendment 9)
Cycle Counting NRC Questions Cycle Counting RAIs and Amendments
- Amendment 3 (annual update)
- Added Unit 3 record review results and revised one transient total to replace an estimate with data
- Revised current program action limit discussion to avoid confusion with the enhanced program limits
- Minor clarifications were included in the AMP OE discussion
Cycle Counting RAIs and Amendments (continued)
- Amendment 9 (result of RAI B3.1-1 thru 8)
- RAI B3.1-4 response provided the individual unit cycle totals from best available sources
- Corrected typographical errors
- Included enhanced monitoring implementation schedule
- Committed to selection of a suitable SBF methodology
- Clarified cycle projection methodology
Cycle Counting RAIs and Amendments (continued)
Most recent cycle count related DRAI set (DRAI 4.3-1 thru 9
- DRAI 4.3-1 Transients projected to exceed 40-year limits
- Projections are conservative and may not be reached
- PVNGS took no exceptions to X.M1 and concludes fatigue reanalyses are not required based on projections . Corrective action will be initiated if needed based on program action limits
Cycle Counting RAIs and Amendments (continued)
- Presented for information only
- Concept of a worst case bounding unit
- Conservative Assumptions
- Highest unit total was used for 85-95 and for 95-05
- Lowest operating years was used for accumulation rate
- 42 years were used for projecting and added to above
- Zero accumulation assumed to be linear times 22/40
- If not expected still assumed 1 event
Cycle Counting RAIs and Amendments (continued)
- DRAI 4.3-2 Global monitoring criteria does not seem consistent
- Exceptions are explained in LRA table notes
- DRAI 4.3-3 Clarify the CBF-PC method
- DRAI 4.3-4 Program action limits (see commitment #39)
- DRAI 4.3-5 Some cycles do not agree with the UFSAR
- Some are derived from UFSAR sections other than 3.9.1
- Some come from specific analyses (e.g. RCP studs)
- Addition of cycles to the UFSAR is under consideration
Cycle Counting RAIs and Amendments (continued)
- DRAI 4.3-6 25% cycle assumption
- Review of best source data was presented in the response to RAI B3.1-4
- Compared assumption to actual data from recount efforts or data from 95-05
- Result:
- Four assumptions of 25% cycle accumulation are being reviewed: Rx Trip, Load Reject, Turbine Trip w/o Rx Trip and Depressurization by MSSV at 100% power
- Remaining 25 % assumptions are conservative
Cycle Counting RAIs and Amendments (continued)
- DRAI 4.3-7 Not all cycles were recounted
- Some had accurate data and did not require recount
- Some were not significant (e.g. plant loading at 5%/min)
- Some could not be recovered so the 25%
assumption was used and validated from 95-05 data
Cycle Counting RAIs and Amendments (continued)
- DRAI 4.3-8 Questioned an incorrect table note (had been corrected in Amendment 9)
- DRAI 4.3-9 Some cycles are not included in the UFSAR (similar to DRAI 4.3-5)
- Some come from specific analyses (e.g. RCP studs)
- Addition of cycles to the UFSAR is under consideration
Class 1 Fatigue TLAA Evaluation Process - LRA Section 4.3.2
Class 1 Fatigue TLAA Evaluation Process
- Identify TLAAs and Affected Components
- SRP Guidance, Industry Experience, CLB Search
- Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB)
- Evaluate and Summarize CDB TLAAs
- Analysis Results - Analyzed Locations, CUFs, etc.
- Effects of Modification, Analysis, and Op. History
- Effects of Differences in Analysis Methods
- Identify Disposition
Identify TLAAs and Affected Components
- NUREG-1800 Sect. 4.3 and Tables for Class 1
- Based on ASME III Subsection NB and NG and Industry Experience
- Industry Experience - Examples:
- Other LRAs
- NRC and NSSS vendor Bulletins, Notices, etc.
- Word Search of CLB (FSAR, Docketed Reports, Letters, etc.)
- Confirm applicability to Palo Verde
- Identify other plant-specific TLAAs
Retrieve Component Current Licensing and Design Basis Documents (CLB and CDB)
- Research and Summarize History of CLB
- Confirm Current Licensing Basis
- Research Design and Analysis History
- Confirm Current Design Basis
- TLAAs are analyses, are therefore part of the CDB
- TLAAs are usually bases of the CLB (incorporated by reference) rather than included verbatim
Evaluate and Summarize CDB TLAAs
- All TLAA Results (e.g., all reported fatigue summaries)
- All Analyzed Locations
- Tabulated for Complex Components
- Effects of Modification, Analysis, and Operating History - Examples:
- Instrument Nozzle Half-Nozzle and MNSA Repairs (Several LRA Sections)
- Pressurizer Surge Line Thermal Stratification (LRA Section 4.3.2.9)
- Unit 2 Head Vent Repair - high part-life CUF, head replaced Fall 2009 (LRA p. 4.3-34)
Evaluate and Summarize CDB TLAAs (Continued)
- Based on Analysis History, Results, and Methods
confirm adequate margin at 60 years
- Requires Aging Management
Evaluate and Summarize CDB TLAAs (Continued)
- Identify Disposition (Continued)
- 10 CFR 54.21(c)(1)(iii) monitoring methods are described in LRA 4.3.1, summarized by monitored location in Table 4.3-4
- Details of 10 CFR 54.21(c)(1)(iii) monitoring methods are location and analysis-specific. Examples:
- Cycle-based fatigue (CBF) - monitor transients, possible CUF impacts
- Stress-based fatigue (SBF) - impact of transients require reevaluation of CUF
NRC Staff Questions
- Have we answered the questions and issues stated in this presentation?
- Does the staff have additional questions with respect to cycle counting or the PVNGS approach to metal fatigue?
- Future topics Thank you for your participation
