ML15070A252

Palo Verde Pre-Submittal Public Meeting Final Slides on Risk-Informed Completion Times.

ML15070A252
Person / Time
Site:	Palo Verde
Issue date:	02/18/2015
From:	Edington R K Arizona Public Service Co
To:	Watford M M Plant Licensing Branch IV
Singal B K
References
Download: ML15070A252 (34)

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Palo Verde/NRC Pre-submittal MeetingRisk Informed Completion TimesFebruary 18, 2015 IntroductionsBryan ThieleDepartment LeaderRisk Informed Project Manager Agenda*Introduction Bryan Thiele *Palo Verde OverviewThomas Romay*License Amendment Thomas Weber*PRA Summary Everett DePue*Implementation Plan Bryan Thiele*Path Forward and Closing CommentsBryan Thiele3 Desired Meeting Outcomes*Summarize PVNGS design with focus on unique features*Discuss license amendment content and variances from TSTF 505*Provide overview of PRA models*Discuss implementation plan*Describe path forward4 Palo Verde Design OverviewTom RomayShift ManagerSenior Reactor Operator 6

Transmission Network7 Palo Verde Design Features*Three identical, separate Units, minimal shared SSCs*No pressurizer PORVs*Low leakage RCP seals following loss of seal cooling*Four channels of class instrumentation (two trains w/2 channels each) with separate power*Demonstrated capability to feed SG with no AC/DC power8 License Amendment RequestThomas WeberDepartment LeaderNuclear Regulatory Affairs RICT Timeline20122013201420152016+10License Amendment Drafted and Sent Out for Cross Organization Review -

1stCutBenchmarking with Vogtleand Diablo CanyonLAR SubmittalAll PRA Peer Reviews Complete (Internal Events, Fire, Flood, Seismic)Approval and ImplementationLAR Final PVNGS Internal ReviewFire and Seismic PRA Development PVNGS LAR Content*Based on TSTF 505-A & NEI 06-09-A-Scope includes components modeled in PRA-25 LCOs -Mode 1 and 2 only -New TS Section 5.5 Program-Variances from TSTF 505 addressed in LAR and include:*RICT added to two LCOs not in TSTF 505*Miscellaneous variances described in LAR11 TS 3.4.12, Pressurizer Vents *Not in TSTF 505 or NUREG 1432*In PV Safety Analysis *Modeled in PRA*RICT added to Two Required Actions-Note added to preclude use of RICT when all pressurizer vent paths are intentionally made inoperable12 Pressurizer Vent Paths13Reactor Drain TankSSSSSPressurizerTo Containment AtmosphereRCB-HV108RCA-HV103RCB-HV109RCB-HV105RCA-HV106 TS 3.7.3, Main FeedwaterIsolation Valves (MFIVs)*Not in TSTF 505 but is in NUREG 1432*LAR adds restoration action*MFIVs modeled in PRA*RICT added to Two Required Actions14 Miscellaneous Variances -TS 3.7.2, Main Steam Isolation Valves (MSIVs)*Did not add RICT for restoration conditions associated with MSIV actuator trains-TS 3.7.4, Atmospheric Dump Valves (ADVs)*Note added to preclude use of RICT when all ADV lines are intentionally made inoperable-TS 3.7.9, Ultimate Heat Sink (UHS) *Added new 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> restoration condition for UHS*Note added to preclude use of RICT when the UHS is intentionally made inoperable-TS 3.8.7, Inverters*Revised note since PVNGS design has two inverters per train supporting 4 channels of vital instruments*Note precludes use of RICT for two or more inverters intentionally made inoperable resulting in a loss of safety function15 Summary *LAR to remove "Second Completion Time" (TSTF 439) in progress *Minimizing LARs at PVNGS that have changes to TSTF 505 LCOs *Monitoring TSTF 505 Operating Experience*Participating in Industry Committees*Monitoring TSTF 505 RAIs 16 PRA ModelsEverett DePueSenior EngineerPRA Lead for TSTF-505 Summary of PRA Models*PRA models developed and peer reviewed-Internal events-Internal flood-Internal fire -Seismic*RG 1.200 Rev. 2 hazards screened and peer reviewed*Total CDF/LERF meet RG 1.174 Rev. 2 limits*Internal events and internal flood risk very low*CDF/LERF dominated by internal fire and seismic hazards18 Internal Events PRA*Peer review by CEOG conducted in 1999*Self-assessment performed against entire RA-Sa-2009 in 2015*RA-Sa-2009 Supporting Requirements met to Capability Category II except:-Some sub-elements of SY-C1, SY-C2 System Notebook Documentation need completion*To be completed prior to RICT Program implementation19 Internal Flood PRA*Industry Peer Review conducted in 2010*All ASME/ANS PRA requirements met to Capability Category II after peer review findings addressed20 Internal Fire PRA*PVNGS is not NFPA-805 plant, -Fire PRA complies with methods in NUREG/CR-6850*Industry Peer Review conducted in 2012*Follow-up Industry Peer Review conducted in 2014 -addressed 2012 findings*All ASME/ANS requirements met to Capability Category II after peer review findings addressed21 Seismic PRA*Industry peer review conducted in 2013*All ASME/ANS requirements met to Capability Category II after peer review findings addressed except-SPR B7 Complementary Success Logic*Meets Capability Category II for ASME/ANS RA-Sb-201322 Plant-Specific Modeling*RICT CRMP model will be either:-Real time risk model as currently used for existing Technical Specification CRMPOR-Pre-solved solutions (STP approach)*Common Cause treatment will be in accordance with NEI 06-09-A or Regulatory Guide 1.177 Rev. 123 Plant Modifications*PRA models rely on installation of modifications or taking compensatory measures*RICT Program will not be implemented until modifications complete or compensatory measures in place*FLEX strategies not yet reflected in the PRA models -conservatism24 Summary*All hazards have been evaluated in accordance with RG 1.200 Rev. 2*All PRA models peer reviewed*Capability Category II met for all PRA models with three exceptions*Total CDF/LERF meet RG 1.174 Rev. 225 Implementation PlanBryan ThieleDepartment LeaderRisk Informed Project Manager Implementation Plan*Engineering coordinate RICT implementation *Cross organization team supporting implementation*RICT implemented in Modes 1 and 2 only*CRMP tool PRA Models will include Internal Events, Internal Flooding, Fire, and Seismic*Procedure changes, training, and qualifications will support RICT CRMP capability-Extensive use of industry participation & benchmarking to develop program, procedures, training27 Procedures*Revise 40DP-9RS01, Operations Department Online Nuclear Risk Management Mode 1 and 2, to include -RICT -Risk management action times-Risk management action determinations-PRA functionality*New RICT Program Procedure28 Training*Licensed Operators-Hands-on training on RICT calculations-Classroom training to address how RICT impacts Station Operations*Station Management-Affected managers trained on process, expectations, limitations-Multi-discipline management representatives attend annual MIT nuclear operational risk management (NORM) course*Engineering*Work Management29 Communications*Industry peers via TSTF-505 task force*Site-wide communication-Newsletter-VP weekly video-While submittal under review-Once submittal is approved*Leader Alignment Meetings*Department All Hands Meetings30 Modifications*DC ammeter circuits *Non-class 1E DC motor circuits*Replace RCP control cables with fire rated cables *Install new Steam Generator (SG) makeup pump that utilizes FLEX connections*Breaker coordination on risk significant non-class 1E motor control centers/panels31 Path ForwardandClosing CommentsBryan ThieleDepartment LeaderRisk Informed Project Manager Path Forward*Resolve Fire PRA peer review findings and complete documentation*Submit LAR in June *Finalize scope and install modifications*Develop procedures, software and training in parallel with NRC review*Implement in late 201633 34We SAFELYand efficientlygenerate electricity for the long term