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{{#Wiki_filter:Three Mile Island, Unit | {{#Wiki_filter:Three Mile Island, Unit 1 Summary of Tube-to-Tube Wear Identified During T1R19 (Fall 2011) | ||
January 26, 2012 NRC Headquarters | |||
Introduction 2 Introductions and Opening Remarks Bill Carsky, TMI-1 Site Engineering Director | |||
* Greg Ciraula, TMI-1 Engineering Programs Manager | |||
* Mark Torborg, TMI-1 Steam Generator (SG) Program Engineer | |||
* Steve Queen, Director Corporate Engineering Programs | |||
* Jay Smith, Corporate SG Program Manager | |||
* Wendi Croft, Senior Licensing Engineer | |||
Purpose 3 9 Provide information on tube-to-tube (T-T) wear | |||
* Inspection results | |||
*Reporting Criteria | * How the indications were identified | ||
*Primary and secondary | * Reporting Criteria | ||
*Ho | * Primary and secondary analysis | ||
*Future planned actions 4 | * Ho the indications were How ere si sized ed | ||
*15 stainless steel tube support plates (TSP) | * Basis for sizing techniques | ||
Trefoil broached holes, 1.18 | * Future planned actions | ||
*Maintained hot conditions throughout operating cycle | |||
*In adjacent tubes (two or three)Performed X-Probe and +Point on ADI signals*Verified indications in adjacent tubes face each other *Symmetrically tapered to maximum depth in center | Background 4 9 TMI-1 installed AREVA, Enhanced Once Through Steam Generators (EOTSGs) during T1R18 | ||
*In | * Operated January 2010 - October 2011 9 General design features of EOTSGs | ||
* 15,597 tubes per EOTSG | |||
* Full depth hydraulic expansions in tubesheets | |||
* 15 stainless steel tube support plates (TSP) | |||
Trefoil broached holes, 1.18 thick Numbered 01S (bottom) - 15S (top) 15S TSP has 1470 drill holes in peripheral tubes S | |||
Spacing i b between t TSP TSPs varies i from f 35 - 46.4 46 4 Aspirating ports are in 10 span th | |||
* Nominal gap between tubes is 0.25 9 First inservice inspection performed in October 2011 | |||
* 24-month fuel cycles | |||
* 1.72 effective full power years (EFPY) on EOTSGs | |||
* Maintained hot conditions throughout operating cycle | |||
T1R19 Inspection Overview 5 9 100% full length bobbin coil inspections in each EOTSG 9 X-Probe inspections of peripheral tubes (two tubes deep) in each EOTSG (Evaluated 1st span for loose parts) 9 Tube damage mechanisms found in each EOTSG | |||
* T Tube-to-tube b t t b supportt plate l t wear (T-TSP) | |||
(T TSP) (expected) | |||
( t d) | |||
* Tube-to-tube wear (T-T) (not expected) 9 No evidence of tie rod bowing 9 No tie rod to tube contact or proximity | |||
EOTSG A, T-T Wear Map 6 EOTSG B, T-T Wear Map 7 T1R19 T-T Wear Identification 8 9 Reported as absolute drift indications (ADIs) during bobbin coil inspection with most indications located: | |||
* In mid-span | |||
* In the 9th span | |||
* In a radial pattern 30 - 45 | |||
* In adjacent tubes (two or three) 9 Performed X-Probe and +Point on ADI signals | |||
* Verified indications in adjacent tubes face each other | |||
* Symmetrically tapered to maximum depth in center | |||
* In adjacent j tubes the indications are at same elevation and are same length/depth g p | |||
* Length and depth have a correlation that is consistent with wear | |||
* Good correlation of phase angles and voltages between channels 9 Analysts, Exelon Engineering, and AREVA Engineering consensus is that these indications are T-T wear | |||
* Notified Steam Generator Management Program (SGMP) per the requirements of Nuclear Energy Institute (NEI) 97-06 | |||
* Notified NRC | |||
Process for Screening T-T Wear 9 9 Indications reported as ADIs Industry standard is to use I-Codes to identify (possible) flaw signals where no qualified sizing technique exists and supplemental testing is required. | |||
Exelon guidelines require analysts to report all indications of suspected tube wall degradation. | Exelon guidelines require analysts to report all indications of suspected tube wall degradation. | ||
* | * Primary Analysis (manual) 0.5 volts & 90º channel 6 or %TW >0 on channels 4 & 6 | ||
Primary Analysis (manual)0.5 volts & 90º channel 6 or%TW >0 on channels 4 & 6 *Secondary Analysis (auto) 0.5 volts & 30º -95º on channel 6 | * Secondary Analysis (auto) 0.5 volts & 30º - 95º on channel 6 | ||
%TW >0 on channels 4 & 6 and 0.16 volts on channel 6 0.25 volts & 60º -120º on channel 6 | %TW >0 on channels 4 & 6 and 0.16 volts on channel 6 0.25 volts & 60º - 120º on channel 6 | ||
* | |||
Primary = 145, Secondary = 95, Both = | Example TMI-1 T-T Wear Bobbin Data 10 Example TMI-1 T-T Wear Bobbin Data 11 Example TMI-1 MBM Screened as ADI 12 Summary of ADI Indications (T-T Wear) 13 9 ADI Indications 0.5 volt | ||
+Point qualified for sizing T-TSP wear (EPRI ETSS 96910.1) | * A - 9 Tubes Primary = 9, Secondary = 7, Both = 7 | ||
+Point qualified for sizing various shapes of wear (EPRI ETSS 27901 -27907) | * B - 19 Tubes Primary = 19, Secondary = 18, Both = 18 9 All ADIs including review for paired tubes | ||
* A A - 74 Tubes with ADIs (0.08(0 08 - 1.62 1 62 volts) | |||
-11956.4, Broached TSP | Primary = 20, Secondary = 34, Both = 13 o Either Primary or Secondary = 41 o 74 of 74 confirmed by +Point or X-Probe | ||
* B - 202* Tubes with ADIs (0.07 - 1.25 volts) | |||
Primary = 145, Secondary = 95, Both = 71 o Either Primary or Secondary = 169 o *183 of 202 confirmed by X-Probe | |||
* | Process for Screening T-T Wear 14 9 Per Exelon & SGMP PWR Steam Generator Examinations Guidelines, I-Code indications are Category III: Supplemental Test Required | ||
* Prior to T1R19, +Point and X-Probe identified as probes to be used for supplemental examinations X-Probe obe qua qualified ed for o ssizingg T-TSP S wear ea ((EPRI ETSS SS 11956.3) 956 3) | |||
+Point qualified for sizing T-TSP wear (EPRI ETSS 96910.1) | |||
+Point qualified for sizing various shapes of wear (EPRI ETSS 27901 - 27907) o EPRI ETSS 27905.3 Flat Wear was determined to be the correct technique for T-T wear in EOTSGs | |||
Example TMI-1 T-T Wear +Point Data 15 NOTE: Graphic shows partial indication | |||
Example TMI-1 T-T Wear X-Probe Data 16 Example Depth Profiles in Paired Tubes 17 T-T Wear Depth Profiles EOTSG A , Tubes R26-T36 AND R26-T37 22 20 18 R26 - T36 R26 - T37 16 14 DEPTH (% | |||
%TW) 12 10 8 | |||
6 4 | |||
2 0 | |||
13 14 15 16 17 18 19 20 21 22 23 24 AXIAL LOCATION ABOVE TSP 08S (INCHES) | |||
T-T Wear Length-Depth Correlation 18 EOTSG A/B T-T WEAR LENGTH/DEPTH CORRELATION 9 | |||
8 7 | |||
LENGTH (IN NCHES) 6 y = -0.0098x2 + 0.509x + 1.8162 5 | |||
4 3 | |||
2 1 | |||
0 0 5 10 15 20 25 DEPTH (%TW) | |||
Site Qualified Sizing Technique for T-T Wear 19 9 X-Probe T-T wear sizing technique developed in cooperation with EPRI | |||
* Used two of the same samples used to develop ETSS 27905.3 | |||
(+Point Flat Wear) | |||
* Developed Power trend line/regression curve using methodology used for other EPRI X-Probe techniques ETSS 11956.1 - 11956.4, Broached TSP Wear | |||
* Power trend line/regression scatter plot based on multiple examinations of 16 wear scars Wear scars ranged from 8% - 60% TW | |||
* Analysis of standards performed by multiple analysts from three different vendor organizations | |||
* Accuracy validated through comparison of +Point and X-Probe results for EOTSG A | |||
Graphic of Flat Wear Standard X-Probe 20 Graphic of Flat Wear Standard +Point 21 X-Probe Calibration Curve 22 X-Probe Amplitude - Depth Calibration Curve 70 60 50 0.613 y = 13.151x MET % | |||
%TW 40 2 R = 0.991 30 20 10 0 | |||
0 2 4 6 8 10 12 14 Amplitude (Voltage Vmx) | |||
X-Probe Calibration Curve Validation 23 X-Probe 300 kHz Axial Sy.x = 2.09 70 N = 32 60 Structural Variiable (%TW) 50 40 30 y = 0.9603x + 1.4017 2 | |||
R = 0.9831 20 r= 0.9915 10 0 | |||
0 10 20 30 40 50 60 70 NDE %TW | |||
Comparison of +Point and X-Probe 24 EOTSG A X-Probe vs. +Point - %TW Correlation 30 25 20 X-Probe (% | |||
%TW) 15 y = 0.9832x + 0.3458 2 | |||
R = 0.932 10 N = 41 5 | |||
0 0 5 10 15 20 25 30 | |||
+Point (% TW) | |||
T1R19 T-T Wear Summary 25 9 A total of 257 tubes were identified with T-T wear | |||
* EOTSG A: 89 indications in 74 tubes | |||
* EOTSG B: 206 indications in 183 tubes 9 Wear depths range from 1% to 21% through wall (TW) 9 Wear axial lengths range from 2 to 8 9 No proximity or tube contact detected | |||
* TTubes b are in i tension t i att cold ld conditions diti and d iin compression i att h hott conditions 9 Sizing performed by +Point Technique 27905.3 and a site qualified X-Probe Technique | |||
* Good correlation between Bobbin, +Point, and X-Probe techniques 9 All tubes met condition monitoring limits and in-situ pressure testing was not required | |||
T-T Wear Depth Distribution 26 30 25 EOTSG A 20 No. INDICATIONS 15 10 5 | |||
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DEPTH (%TW) 45 40 35 30 EOTSG B No. INDICATIONS 25 20 15 10 5 | |||
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DEPTH (%TW) | |||
T1R19 T-T Wear Summary 27 EOTSG A EOTSG B Total number of In-Service Tubes 15597 15597 Number of T-T Wear Indications 89 206 Number of Tubes T-T Wear 74 183 Average Depth of T-T Wear 5.8% 7.4% | |||
Maximum Depth of T-T Wear 21% 19% | |||
Number of T-T Wear Indications >40% TW 0 0 Average Growth Rate T-T Wear 3.4%/EFPY 4.3%/EFPY 95 th Percentile Growth Rate T-T Wear 9.3%/EFPY 7.6%/EFPY Maximum Growth Rate T-T Wear 12.2%/EFPY 11.1%/EFPY Number of Tubes Plugged for T-T Wear 4 3 | |||
Condition Monitoring Summary for T-T Wear 28 9 Condition Monitoring Satisfied | |||
* Utilized maximum depth and bounding length of 39 for 3 X normal operating pressure differential conditions (3P) | |||
* Substantial margin against accident leakage and structural limits | |||
* Large break loss of coolant accident (LBLOCA) loading conditions evaluated and satisfied Assumed 180 degree circumferential extent of wear | |||
Condition Monitoring Assessment for T-T Wear 29 CM Results for Tube-to-Tube Wear for Both Array Coil and +Point Sizing 100 CM Limit for X-probe sizing 90 SGA X-probe Depths SGB X-probe Depths 80 CM Limit for +Point Sizing SGA +Point Depths Structural Depth in Percen nt Throughwall 70 60 Conservatively 50 Assumed Wear Scar Length was entire span 40 between TSPs (39") | |||
Actual lengths < 9" 30 20 10 0 | |||
0 5 10 15 20 25 30 35 40 45 Structural Length in Inches | |||
Operational Assessment for T-T Wear 30 9 Mixed arithmetic/Monte Carlo method utilized | |||
* Cycle length 1.927 EFPY | |||
* Addressed indications sized with +Point and X-Probe separately | |||
*Used maximum growth over previous | * End of cycle (EOC) length conservatively assumed 39 | ||
* Used maximum growth over previous cycle Conservative relative to ANO experience 9 Significant margin to leakage and burst at EOC | |||
* Margin ~17% for worst case flaw at EOC 9 LBLOCA evaluation also demonstrates significant margin | |||
Planned Future Actions 31 9 Update Site Specific Performance Demonstration (SSPD) training to include T-T wear 9 Convert TMI-1, X-Probe site qualification to EPRI Appendix H, Qualified Technique 9 Provide raw data to EPRI 9 Perform 100% eddy current examinations during T1R20 (Fall 2013) 9 Support AREVA root cause analysis 9 Implement appropriate actions based on the results of the root cause | |||
length for Cycle 19}} | TMI-1 Tube-to-Tube Wear Conclusions 32 9 T-T wear was identified during the first inservice inspection of the TMI-1 EOTSGs 9 All T-T wear indications meet Condition Monitoring and Operational Assessment performance criteria 9 T-T wear does not impact inspection interval length for Cycle 19}} |
Latest revision as of 10:21, 12 November 2019
ML120250105 | |
Person / Time | |
---|---|
Site: | Three Mile Island ![]() |
Issue date: | 01/25/2012 |
From: | Exelon Nuclear |
To: | Peter Bamford Plant Licensing Branch 1 |
Bamford, Peter J., NRR/DORL 415-2833 | |
Shared Package | |
ML120250090 | List: |
References | |
T1R19 | |
Download: ML120250105 (32) | |
Text
Three Mile Island, Unit 1 Summary of Tube-to-Tube Wear Identified During T1R19 (Fall 2011)
January 26, 2012 NRC Headquarters
Introduction 2 Introductions and Opening Remarks Bill Carsky, TMI-1 Site Engineering Director
- Greg Ciraula, TMI-1 Engineering Programs Manager
- Mark Torborg, TMI-1 Steam Generator (SG) Program Engineer
- Steve Queen, Director Corporate Engineering Programs
- Jay Smith, Corporate SG Program Manager
- Wendi Croft, Senior Licensing Engineer
Purpose 3 9 Provide information on tube-to-tube (T-T) wear
- Inspection results
- How the indications were identified
- Reporting Criteria
- Primary and secondary analysis
- Ho the indications were How ere si sized ed
- Basis for sizing techniques
- Future planned actions
Background 4 9 TMI-1 installed AREVA, Enhanced Once Through Steam Generators (EOTSGs) during T1R18
- Operated January 2010 - October 2011 9 General design features of EOTSGs
- 15,597 tubes per EOTSG
- Full depth hydraulic expansions in tubesheets
- 15 stainless steel tube support plates (TSP)
Trefoil broached holes, 1.18 thick Numbered 01S (bottom) - 15S (top) 15S TSP has 1470 drill holes in peripheral tubes S
Spacing i b between t TSP TSPs varies i from f 35 - 46.4 46 4 Aspirating ports are in 10 span th
- Nominal gap between tubes is 0.25 9 First inservice inspection performed in October 2011
- 24-month fuel cycles
- 1.72 effective full power years (EFPY) on EOTSGs
- Maintained hot conditions throughout operating cycle
T1R19 Inspection Overview 5 9 100% full length bobbin coil inspections in each EOTSG 9 X-Probe inspections of peripheral tubes (two tubes deep) in each EOTSG (Evaluated 1st span for loose parts) 9 Tube damage mechanisms found in each EOTSG
- T Tube-to-tube b t t b supportt plate l t wear (T-TSP)
(T TSP) (expected)
( t d)
- Tube-to-tube wear (T-T) (not expected) 9 No evidence of tie rod bowing 9 No tie rod to tube contact or proximity
EOTSG A, T-T Wear Map 6 EOTSG B, T-T Wear Map 7 T1R19 T-T Wear Identification 8 9 Reported as absolute drift indications (ADIs) during bobbin coil inspection with most indications located:
- In mid-span
- In the 9th span
- In a radial pattern 30 - 45
- In adjacent tubes (two or three) 9 Performed X-Probe and +Point on ADI signals
- Verified indications in adjacent tubes face each other
- Symmetrically tapered to maximum depth in center
- In adjacent j tubes the indications are at same elevation and are same length/depth g p
- Length and depth have a correlation that is consistent with wear
- Good correlation of phase angles and voltages between channels 9 Analysts, Exelon Engineering, and AREVA Engineering consensus is that these indications are T-T wear
- Notified Steam Generator Management Program (SGMP) per the requirements of Nuclear Energy Institute (NEI) 97-06
- Notified NRC
Process for Screening T-T Wear 9 9 Indications reported as ADIs Industry standard is to use I-Codes to identify (possible) flaw signals where no qualified sizing technique exists and supplemental testing is required.
Exelon guidelines require analysts to report all indications of suspected tube wall degradation.
- Primary Analysis (manual) 0.5 volts & 90º channel 6 or %TW >0 on channels 4 & 6
- Secondary Analysis (auto) 0.5 volts & 30º - 95º on channel 6
%TW >0 on channels 4 & 6 and 0.16 volts on channel 6 0.25 volts & 60º - 120º on channel 6
Example TMI-1 T-T Wear Bobbin Data 10 Example TMI-1 T-T Wear Bobbin Data 11 Example TMI-1 MBM Screened as ADI 12 Summary of ADI Indications (T-T Wear) 13 9 ADI Indications 0.5 volt
- A - 9 Tubes Primary = 9, Secondary = 7, Both = 7
- B - 19 Tubes Primary = 19, Secondary = 18, Both = 18 9 All ADIs including review for paired tubes
- A A - 74 Tubes with ADIs (0.08(0 08 - 1.62 1 62 volts)
Primary = 20, Secondary = 34, Both = 13 o Either Primary or Secondary = 41 o 74 of 74 confirmed by +Point or X-Probe
- B - 202* Tubes with ADIs (0.07 - 1.25 volts)
Primary = 145, Secondary = 95, Both = 71 o Either Primary or Secondary = 169 o *183 of 202 confirmed by X-Probe
Process for Screening T-T Wear 14 9 Per Exelon & SGMP PWR Steam Generator Examinations Guidelines, I-Code indications are Category III: Supplemental Test Required
- Prior to T1R19, +Point and X-Probe identified as probes to be used for supplemental examinations X-Probe obe qua qualified ed for o ssizingg T-TSP S wear ea ((EPRI ETSS SS 11956.3) 956 3)
+Point qualified for sizing T-TSP wear (EPRI ETSS 96910.1)
+Point qualified for sizing various shapes of wear (EPRI ETSS 27901 - 27907) o EPRI ETSS 27905.3 Flat Wear was determined to be the correct technique for T-T wear in EOTSGs
Example TMI-1 T-T Wear +Point Data 15 NOTE: Graphic shows partial indication
Example TMI-1 T-T Wear X-Probe Data 16 Example Depth Profiles in Paired Tubes 17 T-T Wear Depth Profiles EOTSG A , Tubes R26-T36 AND R26-T37 22 20 18 R26 - T36 R26 - T37 16 14 DEPTH (%
%TW) 12 10 8
6 4
2 0
13 14 15 16 17 18 19 20 21 22 23 24 AXIAL LOCATION ABOVE TSP 08S (INCHES)
T-T Wear Length-Depth Correlation 18 EOTSG A/B T-T WEAR LENGTH/DEPTH CORRELATION 9
8 7
LENGTH (IN NCHES) 6 y = -0.0098x2 + 0.509x + 1.8162 5
4 3
2 1
0 0 5 10 15 20 25 DEPTH (%TW)
Site Qualified Sizing Technique for T-T Wear 19 9 X-Probe T-T wear sizing technique developed in cooperation with EPRI
- Used two of the same samples used to develop ETSS 27905.3
(+Point Flat Wear)
- Developed Power trend line/regression curve using methodology used for other EPRI X-Probe techniques ETSS 11956.1 - 11956.4, Broached TSP Wear
- Power trend line/regression scatter plot based on multiple examinations of 16 wear scars Wear scars ranged from 8% - 60% TW
- Analysis of standards performed by multiple analysts from three different vendor organizations
- Accuracy validated through comparison of +Point and X-Probe results for EOTSG A
Graphic of Flat Wear Standard X-Probe 20 Graphic of Flat Wear Standard +Point 21 X-Probe Calibration Curve 22 X-Probe Amplitude - Depth Calibration Curve 70 60 50 0.613 y = 13.151x MET %
%TW 40 2 R = 0.991 30 20 10 0
0 2 4 6 8 10 12 14 Amplitude (Voltage Vmx)
X-Probe Calibration Curve Validation 23 X-Probe 300 kHz Axial Sy.x = 2.09 70 N = 32 60 Structural Variiable (%TW) 50 40 30 y = 0.9603x + 1.4017 2
R = 0.9831 20 r= 0.9915 10 0
0 10 20 30 40 50 60 70 NDE %TW
Comparison of +Point and X-Probe 24 EOTSG A X-Probe vs. +Point - %TW Correlation 30 25 20 X-Probe (%
%TW) 15 y = 0.9832x + 0.3458 2
R = 0.932 10 N = 41 5
0 0 5 10 15 20 25 30
+Point (% TW)
T1R19 T-T Wear Summary 25 9 A total of 257 tubes were identified with T-T wear
- EOTSG A: 89 indications in 74 tubes
- EOTSG B: 206 indications in 183 tubes 9 Wear depths range from 1% to 21% through wall (TW) 9 Wear axial lengths range from 2 to 8 9 No proximity or tube contact detected
- TTubes b are in i tension t i att cold ld conditions diti and d iin compression i att h hott conditions 9 Sizing performed by +Point Technique 27905.3 and a site qualified X-Probe Technique
- Good correlation between Bobbin, +Point, and X-Probe techniques 9 All tubes met condition monitoring limits and in-situ pressure testing was not required
T-T Wear Depth Distribution 26 30 25 EOTSG A 20 No. INDICATIONS 15 10 5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DEPTH (%TW) 45 40 35 30 EOTSG B No. INDICATIONS 25 20 15 10 5
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 DEPTH (%TW)
T1R19 T-T Wear Summary 27 EOTSG A EOTSG B Total number of In-Service Tubes 15597 15597 Number of T-T Wear Indications 89 206 Number of Tubes T-T Wear 74 183 Average Depth of T-T Wear 5.8% 7.4%
Maximum Depth of T-T Wear 21% 19%
Number of T-T Wear Indications >40% TW 0 0 Average Growth Rate T-T Wear 3.4%/EFPY 4.3%/EFPY 95 th Percentile Growth Rate T-T Wear 9.3%/EFPY 7.6%/EFPY Maximum Growth Rate T-T Wear 12.2%/EFPY 11.1%/EFPY Number of Tubes Plugged for T-T Wear 4 3
Condition Monitoring Summary for T-T Wear 28 9 Condition Monitoring Satisfied
- Utilized maximum depth and bounding length of 39 for 3 X normal operating pressure differential conditions (3P)
- Substantial margin against accident leakage and structural limits
- Large break loss of coolant accident (LBLOCA) loading conditions evaluated and satisfied Assumed 180 degree circumferential extent of wear
Condition Monitoring Assessment for T-T Wear 29 CM Results for Tube-to-Tube Wear for Both Array Coil and +Point Sizing 100 CM Limit for X-probe sizing 90 SGA X-probe Depths SGB X-probe Depths 80 CM Limit for +Point Sizing SGA +Point Depths Structural Depth in Percen nt Throughwall 70 60 Conservatively 50 Assumed Wear Scar Length was entire span 40 between TSPs (39")
Actual lengths < 9" 30 20 10 0
0 5 10 15 20 25 30 35 40 45 Structural Length in Inches
Operational Assessment for T-T Wear 30 9 Mixed arithmetic/Monte Carlo method utilized
- Cycle length 1.927 EFPY
- Addressed indications sized with +Point and X-Probe separately
- End of cycle (EOC) length conservatively assumed 39
- Used maximum growth over previous cycle Conservative relative to ANO experience 9 Significant margin to leakage and burst at EOC
Planned Future Actions 31 9 Update Site Specific Performance Demonstration (SSPD) training to include T-T wear 9 Convert TMI-1, X-Probe site qualification to EPRI Appendix H, Qualified Technique 9 Provide raw data to EPRI 9 Perform 100% eddy current examinations during T1R20 (Fall 2013) 9 Support AREVA root cause analysis 9 Implement appropriate actions based on the results of the root cause
TMI-1 Tube-to-Tube Wear Conclusions 32 9 T-T wear was identified during the first inservice inspection of the TMI-1 EOTSGs 9 All T-T wear indications meet Condition Monitoring and Operational Assessment performance criteria 9 T-T wear does not impact inspection interval length for Cycle 19