ML061110072

License Presentation Materials from Meeting with FPL Regarding SG Inspection at St. Lucie

ML061110072
Person / Time
Site:	Saint Lucie
Issue date:	04/20/2006
From:	Florida Power & Light Co
To:	Office of Nuclear Reactor Regulation
References
Download: ML061110072 (10)

Text

r f FLORIDA POWER & LIGHT ST. LUCIE UNIT 2 STEAM GENERATOR INSPECTION PLANNING FOR SL2-16, APRIL 2006 St Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 AGENDA.Purpose of Meeting.Background

& S/G Condition* SL2-16 Inspection Scope.Projected Tube Plugging* Operating Experience

• Contingency Planning* Generic Letter 2006-01.Summary & Closing 2 FPL 1 V St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Purpose of Meeting* Review SL2 S/G Condition* Review SL2-15 Inspection Planning* Address Staff Concerns St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& S/G Condition* SIG Design* cEModel 3410* 84l1 Tubes I SG* -19.3 EFPY @ SL2-16* A-600 HTMA Tubing* CS Lattice Support System (eggcrates)

• Tubesheet Joint -Explosive* Total Tubes Plugged-SG A -1469 (17.5%)-SG B -1709 (20.3%)* T-Hot -600OF FPL ./2 r St Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& S/G Condition FPL Steam Generator Program* Committed to Safe Operation* Full Implementation of NEI 97-06, S/G Program Guidelines

' Inspection

' Chemistry Leak Monitoring

• Incorporate Industry Experience

• Extensive Examination History at Unit 2 X Conservative Approach& In Situ Pressure Test at Last 6 Inspections

,,- --FP 5 FPLop St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& S/G Condition* Last Inspection

-SL2-15 in January 2005 a Results Discussed with NRR During Outage' Damage Mechanisms Generally as Expected 1 Tube Ding with ODSCC Limited PWSCC in Tubesheet (3 in Upper 2", 1 at Tack Roll)'Increase in Axial ODSCC at Eggcrate Supports'RCL Indications Detected During Pull Out Scans'Addressed in OA Model'Tested with Qualified Technique if > .35 Volts'No Tube Integrity Issues A .FPL 3 V St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Indication Count Summary for SL2-15 Mechanism Axial ODSCC at Eggcrate Supports Axial ODSCC at Diagonal Supports Axial ODSCC at Tube Dings Axial ODSCC in Freespans Axial ODSCC at Top of HL Tubesheet Axial IDSCC Below Top of HL Tubesheet Circ. ODSCC at Top of HL Tubesheet Circ. IDSCC at Top of HL Tubesheet Circ. IDSCC at HL Tube End Wear Due to Foreign Objects Wear at Diagonal & Vertical Supports Wear at Eggcrate Tube Supports FPL SIG A SIG B Total 1184 1266 2450 1 8 9 0 1 1 0 1 1 14 2 16 1 1 2 7 10 17 0 1 1 0 1 1 1 1 2 672 443 1115 67 73 140 St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& S/G Condition TUBE PLUGGING HISTORY Damaae Mechanism (1)OD Cracks at Tube Supports Mech. Wear at Tube Supports OD Cracks at Tubesheet Preservice, FO, Preventative Circ. OD Cracks at Tubesheet OD Volumetric

-Various ID Cracks in Tubesheet OD Cracks at Dings OD Cracks in Freespan 4100 14 18 17 5 11101 259 11 20 51 13 2 4103 482 27 6 10 1105 1592 1 20 2 15 4 3 5 1_ 1 1 54 361 530 1635 Cumulative Plugging Cumulative Percent'I (1) Axial unless noted otherwise FPL 652 1013 1543 3178 , 3.9% 6.0% 9.2% -1B.9%:..a_ ot- '8 4 V St Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& SIG Condition Benchmark of Predicted (best estimate) vs. Observed Indications Mechanism Case Predicted Observed Axial ODSCC at Eggcrates Worst SG 928 1217 Axial ODSCC at Tube Dings All SGs 2 1 Axial ODSCC at Transition All SGs 43 16 Axial IDSCC below Transition All SGs 15 2 Circ. ODSCC at Transition All SGs 25 17 FPL St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& SIG Condition Probability of Burst (POB)Mechanism SG A SIG B ODSCC' at E c029crats 0.0777 ODSCC at D)ings 0.00(Y O)SCC at Topofa-Tubcshect

-0 Cumulatisv P0I3 0.0356* Significant Axial Degradation Mechanisms

• Cycle 15 Length for 10% POB Criterion

-17.4 EFPM* Cycle 15 Length for 5% POB Criterion

-16.2 EFPM _ o* Planned Cycle 15 Length is -14.5 EFPM , FPLI S

-i St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Background

& S/G Condition In Situ Pressure Testing SL2-9 Through SL2-15* 73 Total Indications (19 at SL2-15)* Mechanisms Include Axial ODSCC at Eggcrates Axial ODSCC at Dings'LAxial ODSCC at TTS' Axial IDSCC below TTS Circ ODSCC at TTS' Circ IDSCC at TTS OD Volumetric TTS FPL* No Leakage or Burst* 11.- -Bl y 5 .". ..St. Lucie Unit 2- Steam Generator Inspection Planning for SL2-16 SL2-16 Inspection Scope* Visual Examination of All Tube Plugs* Bobbin Probe All Active Tubes Screen Dings <5 Volts in Straight Sections' Full Length Row 3-140, Straight Length Row 1-2* Plus Point Probe 100% Hot Leg Top of Tubesheet

(+3" /-13")Cold Leg Periphery Tubes (+3"/-2")20% Row 1-2 U-bends (A-23, B-25)20% Wear at Vertical Straps (A-86, B-58)' .00% Wear at Eggcrates, HL & CL Diagonals (A-274,;B-202)

Full Tubesheet if No Tube Expansion (A-21,-B-1) 1-FPL 6 I St Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 SL2-16 Inspection Scope (con't)* Plus Point Probe for Dings SGA SGB' All Dings Hot Leg Tubesheet to 1st Support 68 78' All Dings >5 volts 1st Support to HL Bend 57 80 All Dings in HL & CL Square Bends Row 19-140 90 68' All Dings >5 volts in Horizontal Run Row 19-140 71 102' All Dings in Rows 1-18 U-Bends 113 89' 20% Dings >5 volts CL Tubesheet to CL Bend 17 23 416 440* In Situ Testing Based on Industry Screening Guidance FPL -13 St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Projected Tube Plugging Pr~dictd cNumbir PrchictedNurnm.r of Indliations at of Tub.. R*paired EO :i5 atE FOC IS Mochanismitocation SIG A SIG B SIG A SIC B Axial ODS('C at ls '.cratr Sulqxirts ILtwer 5t 21_00 2178 145S 1257 BLkt Estinlatc 2561 2331 1556 1345 tUppcr954%

2722 2485 165.1 1434 Aexial ODSCC Near TTS 30 I0 30 10 ircuinfermntial ODSCC2at 171S I 20 15 20 ANial I DSCC fICAow TriS 5 , S 5 C.irunircrcntiiil iScc .tcibw rrs s 5 S 5 Axi¶,l Oi )SCC at Dings S 5 5 Best Estimate Cumulative Repairs -3050 -3075 Current Tube Plugging Limit 2520 .;252 : FPL 14 7 I St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Tube Sleeving Plans Westinghouse Alloy 800 Leak Limiting Sleeve* 60-70% of Repairable Tubes are Candidates

• Sleeve Tubes that Require Only 1 Sleeve* Maintain 30% Effective Tube Plugging Margin* Contingency for 42% Tube Plugging> Required Repairs Exceed Expectations

' Sleeving Field Effort Difficulties

-' 15 FPL St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Operating Experience

• Continue Emphasis on Dings/Dents

&Anomalous Indications

• Foreign Object Damage* Batwing Support Condition (Waterford)

• Fabrication Issues (Byron & Davis Besse)* Tube to Tube Wear (Tube Sever)' Susceptible Locations to be Reviewed by Lead Analysts.-16 FPL 8 St. Lucie Unit 2 -Si Inspection Plannin, Contingenc Issue or Inspection Item Leaking Plug Crack in Row 1&2 U-bend team Generator g for SL2-16 Crack in U-bend Wear Scar Crack in Cold Leg Ding Foreign Object Wear CL Expansion Transition Cracking Freespan Cracking RCL Indications on Pull Out Scan FPL y Planning ContinQency Action Replace as Necessary Test 100% Affected Rows& 20% Row 3, etc.Test All (A-430, B-290)Test All (A-85, B-1 15)Bound FO Wear Test 100% in Affected SG Validate Bobbin POD Retest if >.35 Volts ,,,¢ <tws-7 17 St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Generic Letter 2006-01 Submit LAR to Adopt TSTF-449 By May 31, 2006> Replacement SG Program> Original SG Program* Include Sleeving Repair Method* Include Tubesheet Inspection Provisions (C*)* Administrative Controls-Limit Pri-Sec Leakage to 108 gpd/SG-Address Leakage Predictions for 1 7 Tubesheet

& Sleeves 18 FPL ,es 9 I St. Lucie Unit 2 -Steam Generator Inspection Planning for SL2-16 Summary & Closing* FPL Program Meets Industry Guidance.Comprehensive Inspection Program* Reasonable Assurance of Tube Integrity* Compliance with Tech Specs & NRC Positions* Amend License for TSTF-449* Identify & Address Staff Concerns FPL 19 10