ML061280488
| ML061280488 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie  |
| Issue date: | 04/20/2006 |
| From: | Moroney B NRC/NRR/ADRO/DORL/LPLD |
| To: | |
| Moroney B, NRR/DORL, 415-3974 | |
| Shared Package | |
| ML061250269 | List: |
| References | |
| TAC MD1084 | |
| Download: ML061280488 (9) | |
Text
I FLORIDA POWER & LIGHT ST. LUCIE UNIT2 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
. Summary & Closing IPL 1
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 FPL St Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Background & SIG Condition I..t
- S/G Design CE Mndel-3410 0
0 8411 Tubes / 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 _
MOVN j
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co=
NR Wcm2 s ;Wm, masrW PrA COOLn FP2L 4
2
St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Background & SIG Condition FPL Steam Generator Program
- Committed to Safe Operation
- Full Implementation of NEI 97-06, SIG Program Guidelines
'Inspection
'Chemistry
> Leak Monitoring
- Incorporate Industry Experience
- Extensive Examination History at Unit 2 c Conservative Approach In Situ Pressure Test at Last 6 Inspections
- FPL St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Background & S/G Condition r Last Inspection -L2-15 in January 2005
- 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 j
'No Tube Integrity Issues MLF 3
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 SIG A 1184 1
0 0
14 1
7 0
0 1
672 67 S/G B 1266 8
I 1
2 1
10 I
1 1
443 73 Total 2450 9
1 1
16 2
17 1
1 2
1115 14.~W FPL
.Mgf
'00001" 7
St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Background & SIG Condition TUBE PLUGGING HISTORY Damage 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 Cumulative Plugging Cumulative Percent 4100 14 18 17 5
11/01 259 11 20 51 13 2
4103 482 27 6
10 4
1105 1592 I
20 2
15 3
5 I
I 1
54 361 530 1635 652 1013 1543 3178 3.9%
6.0%
9.2%
- ;iB.91 A"
GROM sUw (1) Axial unless noted otherwise FPL 1;.
=----
8 4
St. Lucie Unit 2 - Steam Inspection Planning for Generator SL2-16 Background & S/G 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 0FPL
-.1X9 L,7
'0000-''
g St. Lucie Unit 2-Steam Generator Inspection Planning for SL2-16 Background & S/G Condition Probaility of Burt (POB)
Mechanism lMIEA I
I ODSCC at Eggcrates 0.0269 ODSCC at Dings 0.009 ODSCC at Top-of-Tubesheet
-l Cumulative PUB 0.056 l
- Significant Axial Degradation Mechanisms
- Cycle 15 Length for 10% POB Criterion - 17A EFPM
- Cycle 15 Length for 5% POB Criterion -16.2 EFPM
- Planned Cycle 15 Length is -14.5 EFPM FPL 10 5
St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Background & SIG Condition In Situ Pressure Testing SL2-9 Through SL2-15
- 73 Total Indications (19 at SI2-15)
- Mechanisms Include
' Axial ODSCC at Eggcrates
' Axial ODSCC at Dings
' Axial ODSCC at TTS
' Axial IDSCC below TTS
' Circ ODSCC at TTS
' Circ IDSCC at TTS
' OD Volumetric TTS
. No Leakage or Burst FI11 St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 SL2-16 Inspection Scope a Visual Examination of All Tube Plugs E Bobbin Probe All Active Tubes
' Screen Dings <5 Volts in Straight Sections
' Full Length Row 3-140, Straight Length Row 1-2 a Plus Point Probe
' 100% Hot Leg Top of Tubesheet (+3" -13")
' Cold Leg Periphery Tubes (+37/-2u)
' 20% Row 1-2 U-bends (A-23, B-25)
' 20% Wear at Vertical Straps (A-86, B-58)
' 100% Wear at Eggcrates, HL & CL Diagonals (A,74~g-2O2) 9
' Full Tubesheet if No Tube Expansion 424 )
J4-2 12 FF1..
6
St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 SL2-16 Inspection Scope (con't) r 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 t 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 Predicted Number Predicted Number of oltdlcadom at of Tub*s Repaired Eo ts at EOC IS SiG A SIG B WG A 8tG E Axial ODSCX' at Eggcrat Supports Lo.Sy 2400 2178 1438 1237 6est Extinvate 2561 2331 1556 1343 Upper 95*
2722 2485 16S4 1434 Axial ODSCCNearTTS 30 le 30 10 cumlercaztial O1)SCM at TTS 15 20 20 Axial IDSCX Below TTS 5
5 5
CGnurnferentin5 IDSCC Below TS 5
3 Axial O)5C'C at Dingx 5
5 5
5 Best Estimate Cumulative Repairs -3050
-3075 Current Tube Plugging Limit 2520 FPL I
7
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 c Sleeve Tubes that Require Only 1 Sleeve E Maintain 30% Effective Tube Plugging Margin Contingency for 42% Tube Plugging
> Required Repairs Exceed Expectations
> Sleeving Field Effort Difficulties Ad 15 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) c Fabrication Issues (Byron & Davis Besse)
- Tube to Tube Wear (Tube Sever)
> Susceptible Locations to be Reviewed by Lead Analysts FPLL 8
St. Lucie Unit 2-Steam Generator Inspection Planning for SL2-16 Contingency Planning Issue or Inspection Item Contingency Action Leaking Plug Crack in Row 1&2 U-bend 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 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 >
V 0
F:PL 17 St. Lucie Unit 2 - Steam Generator Inspection Planning for SL2-16 Generic Letter 2006-01 Submit LAR to Adopt TSTF-449 a By May 31, 2006
' Replacement SG Program
> Original SG Program
- Include Sleeving Repair Method
- Include Tubesheet Inspection Provisions (C*)
' Administrative Controls
- Limit Pr-Sec Leakage to 108 gpd/SG
- Address Leakage Predictions for Tubesheet & Sleeves FPL 1
9
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 F:PL A19 10