implementation of a performance evaluation system for
TRANSCRIPT
Implementation of a Performance Evaluation System
for Nondestructive Testing Methods
SVTI Swiss Association for Technical InspectionsNuclear Inspectorate
NDE Laboratory
Daniel Algernon, Sascha Feistkorn and Michael Scherrer
Outline
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Nondestructive Testing (NDT)
Meaning for Safety(Making it Measurable)
Ensuring Reliability(e.g. in the Nuclear Industry) Transferring Concepts
between Industries
Conclusion
Motivation
• Highly safety relevant components & industries
• Assessment of structural integrity: Nondestructive Testing (NDT)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Nondestructive Testing (NDT)
NDT Methods• Ultrasonic Testing• Eddy Current Testing• Liquid Penetrant Testing• Magnetic Particle Testing• Radiographic Testing• Thermography• Visual Testing• …
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Meaning of NDT for Safety Concepts
• NDT provides safety-relevant information
• «making safety measurable» requires quantitative information
• Reliable information!ICSC 2016 - "Making Safety Measurable"
Safety
Structural Integrity
Fracture Mechanics
Condition Assessment
Nondestructive Testing
Measures
www.svti.ch Dr.-Ing. Daniel Algernon
NDT in the Nuclear Industry
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Operation
• Safe Operation of Nuclear Power Plants over design life time
• Long Term Operation based on actual condition
Struct.Integrity
• Structural Iitegrity of safety relevant components
• Significant aspect of technical condition
Testing & Evaluation
• Nondestructive Testing and Evaluation (NDE)
• Provide information for condition assessment
Reliability• Information provided must be reliable, since it is the basis for determining safety
Performance Evaluation
• Performance Evaluation of NDE inspection systems to determine their reliability
Demo & TJ
• Performance assessed in practical demonstrations as well as theoretical investigation (technical justification)
Elements of NDT
ICSC 2016 - "Making Safety Measurable"
Equipment
Test Object
Target
NDT Method
Procedure
Personnel
NDT = Information Provider
Value of NDT = Value of Information
Information must be relevant and reliable
Increase in reliability = increase in value
Information
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How to determine reliability?
• Theoretical Assessment– Model & Simulation
– Field Experience
• Practical Demonstration– «See how NDT System performs»
– Compare NDT results to true results• How to determine truth?
– Investigate in controlled conditions• Test blocks, simulating testing problem
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Requirement for Practical Demonstr.
Contradiction:
Realistic and Controled (Simulation)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
!
ENIQ-Methodology
European Network for Inspection and Qualification
• Qualification of Inspection Systems– Procedure– Equipment– Personnel
• Case Specific Practical Demonstration– Component and Flaw Specific– Postulated flaw mechanism– Realistic flaw simulation in test blocks
• Technical Justification– Theoretical Assessment of
• Inspection System• Suitability of Test Blocks and Test Flaws
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Physically simulating field conditions
Physically simulating relevant flaw types (qualification target)
Mockups and test blocks
Example: Qualification on test blockExample: Field Testing
Practical Demonstrations
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Component Full-Scale Mockup
Test Block
Weld
Test flaws
Component, Test Block, Mockup
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Test Flaws
• Mandatory: realistic test flaws
• Example: representing intergranular stress corrosion cracking(IGSCC)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Evaluating Practical Demonstrations
Test Set = Test block or section containing test flaws
Test Sets are given to candidates
Several candidates per qualification project
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Test set/Candidate Relation in IndEva
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
• IndEva: Evaluation System of Swiss Qualification Body
Per Test set:
As-Built Information
Indications reported by candidates
Graphic Representation of Testsets
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
• Evaluation 1: Singular relation Test Set / Candidate
• Evaluation 2: By candidate and related test sets
• Evaluation 3: Procedure (all candidates and test sets)
Evaluation Types in IndEva
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Detection: What percentage of flaws has been detected
False Calls:
In absolute numbers
In % of actual number of test flaws
Per area
Determining Length and Thruwall extent: Statistics
RMS (Root Mean Square)
Mean + Standard deviation
Positioning: Tolerance window
Analysis Criteria
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Evaluation of each individual candidate regarding qualification criteria fordetection, characterization, length and thruwall sizing
IndEva-Output per Candidate
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Total evaluation taking into account the best, worst and averaged results ormedian
Identification of critical test flaws
IndEva-Results by Procedure
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
List of all individual test flaws and the respective results obtained
IndEva-Results per Test Flaw (Table)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Qualification
Qualification = Proof (Demonstration) of PerformanceQualification = Proof (Demonstration + Understanding) of Performance
Qualification = Proof (Demonstration + Understanding) of Performance
Technical Justification (TJ)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Technical Justification: Modeling
• Use of semi-analytical simulation software CIVA
• Powerful tool for parametric studies and technical justification
• Perspective: Reduction of testing effort
• Validation of model is essential, test blocks still needed!
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Confidence
Engineering Understanding(Technical Justification)Practical Trials
(Statistics)
Technical Justification
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Confidence
Practical Trials(Statistics)
Engineering Understanding(Technical Justification)
Since number of test flaws and practical trials is limited, technical justification is an important element
(e.g. in ENIQ Qualification system)
Technical Justification
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Goal:
Combined statistical expression
of practical trials and technical justification
of results and confidence level
Approach: Bayesian Statistics
General Idea: Prior set of parameters adjusted according toinformation gained from technical justification andpractical trials, resulting in posterior set of parameters
Based on Binomial distribution
Quantification of Technical Justification
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Bayesian Approach
• Gandossi & Simola, 2007
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Transfering Concepts betweenIndustries
• Example: «Nuclear2Civil»
NDT in theNuclear Industry
NDT in newIndustry (CivilEngineering)
Transfer of Quality Concepts
Industry (CivilEngineering) Specific Adaption
Identification of IndustrySpecific Practices and
Needs
Adaption of quality-assurance (qualification) concepts to new industries (e.g. NDT in civil engineering).
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Challenging Material vs. Qualification
• Inhomogeneousmaterial
• Individual structuraldesign
• Limited Budget…
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
• Needs Adaption of Concepts!
• Current Topic for DGZfP Quality Assurance Committee
Qualification of Concrete-NDT?
Concrete-NDE Validation Center
Laboratory Test Frame for automated application of nondestructive testing in civil engineering (NDT-CE)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Florida Department of Transportation
Conclusion
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
StructuralIntegrity
Quantify
NDT Quantitative Reliability
Making Safety Measurable
Process/Value Chain
Qualification
Industry SpecificAdaption
Thank you
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Conclusion
• In many industries: NDT provides information used to rate component safety• reliability has direct effect on the operational safety of a component.• nuclear industry: qualification processes ensure NDT reliability (e.g. ENIQ)• Quantitative measures obtained from qualification target and statistical
distribution of trials• Qualification is combination of theoretical assessment (TJ) and practical
demonstration (PD)• Need: express theoretical assessment quantitatively and combine with PD• Approach: Bayesian statistics (Gandossi & Simola)
- capable, though challenging, since it requires adequate evaluation criteria.• Tool IndEva: statistical evaluation of the practical demonstration, identifying
strengths and weaknesses- Covers TJ quantification approach, currently evaluated
• Methodology Transfer: qualification process transferred to other industries, but needs adaption
- First example established: civil engineering (concrete structures).
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
• Qualification = Proof (Demonstration) of Performance
• Qualification process is an important element toensure reliable inspections systems
• Qualification is essential especially in case of safety-relevant compent evaluation (e.g. in nuclear power plants)
• Swiss Association for Technical Inspections (SVTI) serves as the NDE Qualification Body (QSt) in Switzerland
Qualification of Inspection Systems
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
As-Built Information
IndEva-Form for Testblocks and Flaws
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
Taking into account coordinate offsets or scaling:
(X + Offset ax) * Faktor bx + Offset cx
(Y + Offset ay) * Faktor by + Offset cy
IndEva-Candidate Indication Lists
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
IndEva-Results per Candidate
IndEva-Results per Candidate
IndEva-Results per Candidate
WCNDT 2016Implementation of Performance Evaluation Methodology in INDEVA
IndEva-Results per Candidate
WCNDT 2016Implementation of Performance Evaluation Methodology in INDEVA
IndEva-Results per Candidate
WCNDT 2016Implementation of Performance Evaluation Methodology in INDEVA
IndEva-Results per Candidate
IndEva-Results per Test Flaw (Plot)
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
IndEva-Results per Test Flaw
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon
IndEva-Results per Test Flaw
www.svti.ch ICSC 2016 - "Making Safety Measurable" Dr.-Ing. Daniel Algernon