inspection and monitoring of pipe wall thinning and ruptureinspection and monitoring of pipe wall...
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Pusan National University Quality Engineering & Failure Prevention Lab마스터 부제목 스타일 편집
Joon-Hyun Lee
Inspection and Monitoring of
Pipe Wall Thinning and Rupture
Director, Basic Atomic Energy Research Institute School of Mechanical EngineeringPusan National University ,Busan 609-735, Korea
IAEA Workshop on Detection, research, management and monitoring of ageing factors,Buenos Aires, Argentina, 9-12 December 2008
Basic Atomic Energy Research Institute
Pusan National University Quality Engineering & Failure Prevention Lab
Contents
1. Thinned Pipe Management Programme(AMP-11 Flow Accelerated Corrosion)
2. Activities on Dissimilar Metal Weld
3. Development of Mechanical Analysis and Crack Management Technology for DMW
4. Development of Performance Demonstration System for DMW
5. Inspection & Monitoring Technology of Pipe Wall Thinning
6. Evaluation of Statistical Reliability on Ultrasonic Thickness
Measurement Results by Round Robin Test
7. Research Activities of Inspection & Repair Technique Review in Japan
Pusan National University Quality Engineering & Failure Prevention Lab
Thinned Pipe Management Program
(AMP-11 Flow Accelerated Corrosion)
3
Pusan National University Quality Engineering & Failure Prevention Lab4
Mihama-3 Accident (2004.8.9)- Pipe rupture due to wall thinning- 5 men killed, 6 injured- Shutdown for 29 months(restarted on Jan. 11, 2007)
- Big loss in human and money- Importance of FAC popped up
Importance of FAC
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Overview of TPMP
Pusan National University Quality Engineering & Failure Prevention Lab6
NSAC-202L-R3(2006.05)
’’96.0896.08--’’99.0899.08 ’’00.0400.04--’’03.0303.03 ’’04.1204.12--’’07.1207.12 ’’09.0409.04--’’11.1211.12Introduction ofNSAC-202L & CHECWORKS
Development ofstandard procedure(TPMP)
Optimization of technical activitieson TPMP
Preparations fornew plants, power uprating
Plant FAC Model• KR3,4 Plant FAC Model
• KR1,2• WS1,2,3,4• YG1,2,3,4• UC1,2,3,4
Plant FAC Model•YG5,6 & UC5,6
Plant FAC Model• SKR1,2 & SWS1,2
PSI (Baseline Data)• YG5,6 & UC5,6
Convert to SFA,DB Expansion, SSE• KR1,2,3,4• WS1,2,3,4• YG1,2,3,4• UC1,2,3,4
PSI (Baseline Data)• SKR1,2 & SWS1,2• 1,000 components• Jacket type insulation
UT Inspection• Partial ⇒ FullSelect Location• Engineering Judgment⇒ Model Analysis
NSAC-202L-R1(1996.11)
NSAC-202L-R2(1999.04)
TR-1011231(2004.11)
WANO SER 2006-1
(2006.09)
INPO EPG(2006.12)
•Criteria for UTCriteria for UTCriteria for UTCriteria for UTthickness measurethickness measurethickness measurethickness measure(Round Robin Test)(Round Robin Test)(Round Robin Test)(Round Robin Test)
•Alternative criteriaAlternative criteriaAlternative criteriaAlternative criteriato ASME CC Nto ASME CC Nto ASME CC Nto ASME CC N----597597597597(Experiment & FEA)(Experiment & FEA)(Experiment & FEA)(Experiment & FEA)
EngineeringEngineeringEngineeringEngineeringevaluation evaluation evaluation evaluation EqsEqsEqsEqs....(FEM & Experiment)(FEM & Experiment)(FEM & Experiment)(FEM & Experiment)
History of TPMP
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Scope of TPMP
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Assess Plant Wear Level
Inspection(Thickness Measure)
Evaluate Wear and Remaining Life
Determine Following Action
Select Componentwhere Inspection
Needed
Thickness Criteria (tcrit)
Minimizing UT Reading Inaccuracy
Including all Steam Cycle Piping SystemFAC + Erosion (Cavitation/Flashing/LIE)
Establishing Predictive Plant Model
CC-N597 / Next Insp. Period
Chexal-Horowitz FAC Model
8
Engineering Activities of TPMP
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Web-Based Management System
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• Results : Ratio of Safety Margin– Applicable Moment / Design Moment– Burst Pressure / Design Pressure– Predicted Local Thickness / Allowable Local Thickness
• Applicable to Non-Safety Piping(96% of Secondary System)• Independent Software, engineer can use easily
10
Pipe Thinning Evaluation Program
Pusan National University Quality Engineering & Failure Prevention Lab11
Alternative Local Wall-Thinning Assessment Criteria
- Provide criteria for structural integrity of pipe- Find locations susceptible to FAC- Minimize the possibility of unexpected pipe failure
Integrated approach onThinned Pipe Management
PredictivePlant
Model &Trend
Tracking
Criteria for the Ultrasonic Thickness
MeasurementBurst Test with Pressure
Failure Test with
Pr. & Bending
Analytical Approach(Elastic -
Plastic, TES)
Effects of TPMP
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Activities on Dissimilar Metal Weld
Pusan National University Quality Engineering & Failure Prevention Lab
PWSCC Cases in DMW
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Activities on DMW in KEPRI
Pusan National University Quality Engineering & Failure Prevention Lab
Development of Mechanical Analysis
and Crack Management Technology for
DMW
Pusan National University Quality Engineering & Failure Prevention Lab
Mechanical Analysis for DMW
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Evaluation of Residual Stresses (1/2)
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Evaluation of Residual Stresses (2/2)
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Analysis vs. Measurement
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Development of
Performance Demonstration System
for DMW
Pusan National University Quality Engineering & Failure Prevention Lab
PD of NDE
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PD System for DMW(1/3)
Pusan National University Quality Engineering & Failure Prevention Lab
PD System for DMW(2/3)
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PD System for DMW(3/3)
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Inspection & Monitoring Technology
of Pipe Wall Thinning
Pusan National University Quality Engineering & Failure Prevention Lab
� Possibility of long range inspection� Application for inaccessible site� High sensitivity for defect in comparison
with bulk wave� Safe of inspection time and cost due to
fast speed
� Possibility of long range inspection� Application for inaccessible site� High sensitivity for defect in comparison
with bulk wave� Safe of inspection time and cost due to
fast speed
�Contacting generation and reception of the wave
�Time-consuming�Intensity of the wave is not stable due to the variation of the coupling condition�Limitation of inspection area �Temperature limitations
�Contacting generation and reception of the wave
�Time-consuming�Intensity of the wave is not stable due to the variation of the coupling condition�Limitation of inspection area �Temperature limitations
Conventional Ultrasonic testingConventional Ultrasonic testing NDE technique using guided wavesNDE technique using guided waves
Utilization of Guided Wave Technique
Pusan National University Quality Engineering & Failure Prevention Lab
Comparison of Various Techniques Using Guided Wave
PZT PVDF MSsR Air-coupled Transducer
Laser(with slit)
Variables Frequency, angle
Frequency,wavelength
Frequency angle wavelength
Contact or not contact contact Closely non-contact
Non-contact Non-contact
PZT PVDF MSsR Air-coupled Transducer
Laser(with slit)
Variables Frequency, angle
Frequency,wavelength
Frequency angle displacement
Contact or not contact Contact Closely non-contact
Non-contact Non-contact
Mode selectivity Selectable Selectable Selectable Selectable NoneS/N ratio best Good Good good Not good
1. Generators of guided wave
2. Receivers of guided wave (frequency < 5MHz)
Pusan National University Quality Engineering & Failure Prevention Lab
Long range inspectionLong range inspection
Local inspectionLocal inspection
comb transducer
� Conventional technique using guided waves→→→→ Long range inspection� Ultrasonic testing using laser →→→→ Defect sizing by local inspection in spot
where defect is apt to generate
defect
NDE using Laser Generated Ultrasound
Metal corrosion
Pusan National University Quality Engineering & Failure Prevention Lab
Generation of Guided Wave Comb Transducer
Fully contact with cylinderical shape
Generation of axisymmetric guided wave
Mode selectivity of guided wave
Contact method using Comb Transducer
Longitudinal wave
Transverse wave
L wave Incidence
Pusan National University Quality Engineering & Failure Prevention Lab
� High power tone burst system
� Transmitter : Comb transducer
� Receiver : Variable angle transducer
Comb transducer- λλλλ = 12mm- Frequency : 1.5Mhz
Com b transducer
λλλλλλλλ
SpecimenSpecimenSpecimenSpecimen Outer DiameterOuter DiameterOuter DiameterOuter Diameter(mm)(mm)(mm)(mm)
Inner DiameterInner DiameterInner DiameterInner Diameter(mm)(mm)(mm)(mm)
Stainless SteelStainless SteelStainless SteelStainless Steel(SUS 304)(SUS 304)(SUS 304)(SUS 304) 114114114114 110110110110
Dimensions of sample tubeDimensions of sample tubeDimensions of sample tubeDimensions of sample tube
Contact method using Comb Transducer
Pusan National University Quality Engineering & Failure Prevention Lab
2. Artificial wall thinningdepth =0.7mm
L =114mm
Shape of wall thinningShape of wall thinningShape of wall thinningShape of wall thinning
35.0=td
d : depth d : depth d : depth d : depth
t : thicknesst : thicknesst : thicknesst : thickness
Machined Machined PointPoint
1. Mode ConversionOscilloscopeLecroy 9310A
Transmitter Receiver
Pulser/ReceiverRitec RAM-10000
Personal Computer
400 mm 100 mm
guided wave propagationEnd of Pipe
Contact method using Comb Transducer
Pusan National University Quality Engineering & Failure Prevention Lab
� Linear slit array→ Element width : 4.5mm� Element gap : 2.25mm, Elements : 7� Standoff : 15mm, Propagation distance : 100mm
Laser-Generated Guided wave
Amplifier
Pulse/ Receiver
Oscilloscope
• Wavelength : 532nm• Energy : 32mJ• Pulse rate :1Hz-10Hz• Pulse duration : 7ns
• Bandwidth : 0.04 - 2.25MHz• Aperture : 34mm x 25mmL
Air-coupled Transducer
Pusan National University Quality Engineering & Failure Prevention Lab
Carbon steel pipe
Experimental Result (cont.)Signal variation according to varying depth of wall-thinning
Time Domain Time-Frequency Domain
Depth 3.6mm
Depth2.4mm
Depth 1.2mm
DefectFree
DepthLength
6mm
� Length : 48mm� Depth : 1.2, 2.4, 3.6mm� Receiving Angle : 6.4°°°°� Distance between laser - ACT: 90mm
Experimental data
Pusan National University Quality Engineering & Failure Prevention Lab
The Schematic of the MsSR 2020 instrumental system
MssR 2020
• Pulse-Echo method
• One sensor can be transmitter and receiver.
• 128kHz torsional dual channel adaptor are used.
Carbon Steel PipeCarbon Steel PipeCarbon Steel PipeCarbon Steel Pipe
Ferromagnetic Strip
Pulse-Echo Method
6.1m Echo SignalTorsional guided waves
Transmitter & Receiver
• T-mode
• Frequency : 128kHz (Dual Channel)
• Direction : (+)
3.5m 0.15m 2.45m
MAGNETOSTRICTION
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Monitoring Technology Proposedby PNU, SNU
Pusan National University Quality Engineering & Failure Prevention Lab
Overview of New Technology
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Principle of ES-DCPD
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Principle of Impact Method
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Wide Range Monitoring Verification
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Narrow Range Monitoring Verification
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Impact Method Monitoring Verification
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Evaluation of Statistical Reliability on
Ultrasonic Thickness Measurement
Results
by Round Robin Test
Pusan National University Quality Engineering & Failure Prevention Lab
Pipeline Management Program
CHECWORKSTM
- software workstation intended to address the corrosion behavior of NPP- data management & corrosion analysis program
• Evaluate UT data obtained during wall thickness inspections• Organize, store, retrieve & management plant data• Evaluate plant water treatment options• Determine FAC wear rate• Identify locations susceptible to FAC• Facilitate outage planning & management
- In Korea, wall-thinning in pipelines has been monitoring on the basis of CHECWORKS program introduced by EPRI since the mid-1990’s
Pusan National University Quality Engineering & Failure Prevention Lab
� Investigation of the reliability on Ultrasonic thicknessmeasurement system- Analysis of error factors on Ultrasonic thickness measurement by doing Round Robin test from 4 different experts group using mock-up and field specimens
- Analyze these Data by statistical methods to verify reliability in measurement system
- Derive confidence intervals of local part and inspectorsrespectively
Objective
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Gage R&R Analysis (1)
Analysis of errors in measurement system�Measurement system errors divide two part of variations
�Repeatability (A.V.) - variation of repetitive measurementsby an individual inspectorex) measurement position, direction..
�Reproducibility (E.V)- variation of each inspectors in groupex) expertness, condition..Gage R&R method can analyze thesefactors. Measurement system error analysis
Pusan National University Quality Engineering & Failure Prevention Lab
Gage R&R analysisE.V. (Equipment Variation ) : Standard deviation of reproducibilE.V. (Equipment Variation ) : Standard deviation of reproducibilityity
n: No. of gridr : No. of repetitionX : data average
d : Duncans coef.R : range average6sigma : 99.73%A.V. (Appraisal Variation) : Standard deviation of reproducibiliA.V. (Appraisal Variation) : Standard deviation of reproducibilityty
( ) ( )22 ....& VEVARGageR +=
Gage R&R Analysis (2)
( ) ( )1*2
6ˆ6.. kRRd
VE ×=
== εσ
*216d
k = 693.1*2 =d
( ) ( ) ( ) ( )nrVEkX
nrVEX
dVA diffdiffo
2
22
22
*2
..)(..6ˆ6.. −=−
== σ
Pusan National University Quality Engineering & Failure Prevention Lab
Materials and Experimental Setup (1)
Type Thickness(mm) Flaw Type Thickness
(mm) Flaw
2”
Pipe 3.91 7
8”
Pipe 8.18 7Elbow 3.91 2 Elbow 8.18 2Tee 3.91 3 Tee 8.18 3
Reduce 3.91 2 Reduce 8.18 2
4”
Pipe 6.02 7
12”
Pipe 9.52 7Elbow 6.02 2 Elbow 9.52 2Tee 6.02 3 Tee 9.52 3
Reduce 6.02 2 Reduce - -
6”
Pipe 7.11 7 16” Elbow 12.7 Natural
Elbow 7.11 2 3.5” Elbow 5.49 Natural
Tee 7.11 3 3.5” Tee 5.49 Natural
Reduce 7.11 2 18” Reduce 30.96 Natural
Round-Robin test specimens Pipe : A106 Gr. B Fitting : A234 WPB
Field specimens
Pusan National University Quality Engineering & Failure Prevention Lab
8 inch
12 inch
2 inch
4 inch
3.5 inch Tee, Elbow
18 inch Reducer
16 inch Elbow
6 inch
Total grid : 2131 point
Artificial specimens : 19eaField specimens : 4ea
Foreground of round-robin test-loop
Inspector - 12 persons in 3 company(1,2,3,4 group)
Gage - Panametrics 37DL-PLUSCouplant- Sonotech Ultragel ⅡⅡⅡⅡProbe - D790-SM (5MHz) : 11mmD795 (5MHz) :7.1mm
Materials and Experimental Setup (2)
Round Robin Test loop foreground
Pusan National University Quality Engineering & Failure Prevention Lab
Experimental method
Round Robin test progress� Measured 3times of 2, 4, 6, 8, 12inch mock-up specimens 19set and field specimens 4set by using 37DL-PLUS gage and D790-SM, D795 probes
� Analyze reliability of normal inspector 3 group and ordinary inspector 1 group � Analyze reliability of pipe sound and local corrosion part� Analyze reliability of elbow Intrados and extrados� Analyze reliability of reducer inlet and outlet
dataTotalgridtimeinspector )716,76(2131312 =××
Pusan National University Quality Engineering & Failure Prevention Lab
Diameter(inch)
Pipe( mm)
Elbow( mm)
Tee( mm)
Reducer( mm)
2 0.10 (2.6%) 0.112 (2.8%) 0.19 (3.6%) 0.16 (2.6%)
3.5 - 0.11 (1.9%) 0.15 (2.6%) -4 0.11 (1.8%) 0.09 (1.5%) 0.18 (2.2%) 0.19 (2.4%)6 0.10 (1.4%) 0.16 (2.3%) 0.17 (1.8%) 0.24 (2.9%)8 0.14 (1.5%) 0.17 (2.1%) 0.16 (1.6%) 0.23 (2.2%)12 0.14 (1.5%) 0.13 (1.4%) 0.14 (1.2%) -16 - 0.11 (0.9%) - 0.37 (1.2%)
Gage R&R analysis of ordinary inspectors
Experimental Results (cont.)
(%) : percentage of average thickness
± ± ±±
Pusan National University Quality Engineering & Failure Prevention Lab
Diameter(inch)
Pipe( mm)
Elbow( mm)
Tee( mm)
Reducer( mm)
2 0.21 (5.4%) 0.31 (7.9%) 0.31 (5.6%) 0.31 (5.0%)3.5 - 0.37 (6.8%) 0.41 (7.5%) -4 0.17 (2.8%) 0.29 (47%) 0.28 (3.5%) 0.31 (3.9%)6 0.16(2.3%) 0.25 (3.5%) 0.25 (2.7%) 0.24 (2.9%)8 0.16 (1.9%) 0.20 (2.4%) 0.22 (2.1%) 0.20 (2.0%)12 0.17 (1.8%) 0.19 (2.1%) 0.19 (1.6%) -16 - 0.19 (1.5%) - 0.70 (2.3%)
Gage R&R analysis of normal inspectors
(%) : percentage of average thickness
± ± ± ±
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
0000
0.10.10.10.1
0.20.20.20.2
0.30.30.30.3
PipePipePipePipe ElbowElbowElbowElbow TeeTeeTeeTee ReducerReducerReducerReducer
Gage R&R analysisOrdinaryOrdinaryOrdinaryOrdinary
NormalNormalNormalNormalNormal inspectors error is higher than ordinary inspectorsIncreased rate of errorPipe : 31.6%Elbow : 46.2%Tee : 32.7%Reducer : 43.9%Average : 38.6%skillfulness, calibration, measurement error..
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
Dia.(inch) Total ( mm) Corrosion( mm) Sound( mm)2 0.10 (2.6%) 0.16 (4.2%) 0.06 (1.4%)4 0.10 (1.8%) 0.12 (1.9%) 0.05 (0.9%)6 0.10 (1.4%) 0.12 (1.8%) 0.09 (1.3%)8 0.14 (1.5%) 0.14 (1.7%) 0.12 (1.5%)12 0.14 (1.5%) 0.16 (1.7%) 0.13 (1.3%)
Average 0.12 (1.8%) 0.14 (2.2%) 0.09 (1.3%)
Corrosion/sound part gage R&R analysis of pipe
Sound part
Corrosion part of FAC shape
± ± ±
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
0000
0.050.050.050.05
0.10.10.10.1
0.150.150.150.15
0.20.20.20.2
2inch2inch2inch2inch 4inch4inch4inch4inch 6inch6inch6inch6inch 8inch8inch8inch8inch 12inch12inch12inch12inch
Pipe corrosion/sound part analysisPipe corrosion/sound part analysisPipe corrosion/sound part analysisPipe corrosion/sound part analysis
TotalTotalTotalTotal
CorrosionCorrosionCorrosionCorrosion
SoundSoundSoundSound
Local corrosion part shows more higher error.Increased rate of error2inch : 57.3%4inch : 8.3%6inch : 24%8inch : -5.6%12inch : 12.1Average : 19.2%
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
Intrados / Extrados Gage R&R analysis of elbowDia. (inch) Total ( mm) Intrados ( mm) Extrados ( mm)
2 0.11 (2.8%) 0.13 (3.2%) 0.14 (3.7%)4 0.09 (1.5%) 0.16 (1.4%) 0.11 (1.8%)6 0.16 (2.3%) 0.26 (3.7%) 0.21 (2.9%)8 0.17 (2.1%) 0.27 (2.8%) 0.21 (2.5%)12 0.13 (1.4%) 0.11 (1.2%) 0.17 (1.8%)
Average 0.13 (1.8%) 0.15 (2.2%) 0.14 (2.1%)
Extrados
Intrados
± ± ±
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
0000
0.050.050.050.05
0.10.10.10.1
0.150.150.150.15
0.20.20.20.2
0.250.250.250.25
0.30.30.30.3
2inch2inch2inch2inch 4inch4inch4inch4inch 6inch6inch6inch6inch 8inch8inch8inch8inch 12inch12inch12inch12inch
Elbow Intrados/Extrados analysisElbow Intrados/Extrados analysisElbow Intrados/Extrados analysisElbow Intrados/Extrados analysis
TotalTotalTotalTotal
IntradosIntradosIntradosIntrados
ExtradosExtradosExtradosExtrados
Intrados/Extrados shows more higher errorIncreased rate of maximum error2inch : 28.6%4inch : 72.8%6inch : 61.1%8inch : 55.0%12inch : 27.3Average : 49%
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
Local part gage R&R analysis of reducerDia. (inch) Inlet ( mm) Middle ( mm) Outlet ( mm)
2 0.18 (3.4%) 0.17 (2.7%) 0.15 (2.1%)4 0.08 (1.1%) 0.16 (2.0%) 0.09 (1.0%)6 0.13 (1.7%) 0.37 (3.9%) 0.11 (1.1%)8 0.25 (2.7%) 0.21 (2.1%) 0.13 (1.2%)
Average 0.16 (2.2%) 0.21 (2.7%) 0.12 (1.4%)
OutletMiddleInlet
± ± ±
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
0000
0.050.050.050.05
0.10.10.10.1
0.150.150.150.15
0.20.20.20.2
0.250.250.250.25
0.30.30.30.3
0.350.350.350.35
2inch2inch2inch2inch 4inch4inch4inch4inch 6inch6inch6inch6inch 8inch8inch8inch8inch
Reducer local part analaysisReducer local part analaysisReducer local part analaysisReducer local part analaysis
InletInletInletInlet
MiddleMiddleMiddleMiddle
OutletOutletOutletOutlet
Middle part shows more higher errorsIncreased rate of maximum error2inch : 10.5%4inch : 30.6%6inch : 29.5%8inch : 11.6%Average : 20.6%
Experimental Results (cont.)
Pusan National University Quality Engineering & Failure Prevention Lab
Conclusion
� Round Robin Test was conducted for mock-up specimen by 4 groups inspectors from 3 inspection companies.� Precision analysis of test results is obtained using gage R&R method. � Compared skillfulness of ordinary inspectors and normal inspectors� Confidence intervals deviation of corrosion/sound part is 19% in pipe� Confidence intervals deviation of geometrical local part is 49% in elbow
and 21% in reducerVerified confidence intervals of Ultrasonic thickness measurement system.It can be will improve the integrity of CHECWORKS program.
Pusan National University Quality Engineering & Failure Prevention Lab
Research Activities of Inspection &
Repair Technique Review in Japan
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KoriKori SiteSite ViewView--PWRPWR
Coordination with other Review (FY2007)
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Activities for Inspection of SCC & Repair Welding
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Research Achievements in FY2007Detection & Monitoring of
Pipe Wall Thinning(a)DC potential drop method(b)EMAT & EC dual probe(c)EMAT(d)Remote field eddy current method(e)Guided waves with reflector(f) Microwave method
Pusan National University Quality Engineering & Failure Prevention Lab
(a) Evaluation and imaging of SCC around welds by UT
(b) SCC depth sizing by 3D-SAFT UT method
Research Achievements in FY2007Sizing & Monitoring of SCC
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Pusan National University Quality Engineering & Failure Prevention Lab
Pusan National University Quality Engineering & Failure Prevention Lab
Remarks on the Workshop
Pusan National University Quality Engineering & Failure Prevention Lab68
Summary
� Overview of Inspection & Repair Technique Review
� Research Achievements in FY2007• Applicability Evaluation of New Technologies• Detection & Monitoring of Pipe Wall Thinning• Sizing & Monitoring of SCC• Integrity of Repair Welding & Reliability of Repaired Welds
� The First Japan-Korea Joint Workshop
Pusan National University Quality Engineering & Failure Prevention Lab69