The European Network for Inspection and Qualification (ENIQ) is a network dealing with the reliability and effectiveness of non-destructive testing (NDT) for nuclear power plants (NPPs). ENIQ is driven by European nuclear utilities and is working mainly in the areas of qualification of NDT systems and risk-informed in-service inspection (RI-ISI). Since its establishment in 1992 ENIQ has performed two pilot studies on in-service inspection (ISI) qualification and has issued more than 60 documents. ENIQ is recognised as one of the main contributors to today’s global qualification guidelines for ISI.
Recently ENIQ has fully revised all its guidance documents, the “European Methodology for Qualification of Non-Destructive Testing”, the “European Framework Document for Risk-Informed In-Service-Inspection” and the ENIQ Recommended Practices (RPs), as well as the ENIQ Glossary of Terms. The new issues of the ENIQ guidance documents are listed in the following table. Significant changes (e.g. addition of new sections, substantial enlargement of existing sections) are highlighted.
European Methodology for Qualification of Non-Destructive Testing – Issue 4
ENIQ report no. 61
The European Methodology for Qualification of Non-Destructive Testing provides guidelines for the qualification of non-destructive testing. Qualification as defined in this document is a combination of technical justification (TJ), which involves assembling all supporting evidence for inspection capability (results of capability evaluation exercises, feedback from site experience, applicable and validated theoretical models, physical reasoning), and test piece trials using deliberately defective test pieces. European Framework Document for Risk-Informed In-Service Inspection – Issue 2
ENIQ report no. 51
The European Framework Document for Risk-Informed In-Service Inspection is intended to provide general guidelines to utilities for developing their RI-ISI approaches or adapting already established approaches, taking into account utility-specific characteristics and national regulatory requirements.
In Issue 2 of the European Framework Document on RI-ISI the section on living RI-ISI Programmes has been enlarged and new sections (“RI-ISI for LTO” and “Complementing & alternative measures for risk reduction”) have been added. Also the list of RI-ISI terms in the previous issue of the European Framework Document on RI-ISI has been moved to the ENIQ Glossary of Terms.
ENIQ Glossary of Terms – Issue 3
ENIQ report no. 62
The ENIQ Glossary of Terms provides definitions of all the terms used in the ENIQ guidance documents.
Definitions of terms that appeared newly in latest revisions of ENIQ guidance documents were added to this issue of the ENIQ Glossary. Terms whose definitions were changed in latest revisions of ENIQ guidance documents were changed accordingly. Terms related to RIISI were added to the new issue of the ENIQ Glossary of Terms.
RP2: Strategy and Recommended Contents for Technical Justifications – Issue 3
ENIQ report no. 54
The objective of RP2 is to support licensees, qualification bodies and inspection vendors to produce and assess a technical justification (TJ). RP2 includes what and how the contents in a TJ could be described, including the definitions of influential and essential parameters and how these have to be treated. The appendices give examples of influential parameters for three commonly used inspection techniques.
The content of former ENIQ RP1 “Influential / essential parameters – Issue 2” was fully incorporated into Issue 3 of RP2 making it a complete guidance document that includes everything what is needed for writing a TJ. RP1 is redundant and not continued anymore.
RP4: Recommended Contents for the Qualification Dossier – Issue 2
ENIQ report no. 55
The objective of RP4 is to support licensees, qualification bodies and inspection vendors tovproduce and assess a qualification dossier. The latter includes all the information relevant for the definition and the execution of an inspection qualification. RP5: Guidelines for the Design of Test Pieces and Conduct of Test Piece Trials – Issue 3
ENIQ report no. 56
RP5 identifies issues to be considered when designing test pieces for use in experimental inspection qualification trials and provides recommendations for conducting these trials. This document helps plant owners, qualification bodies and inspection vendors in the execution of their respective roles in the qualification process. It is also intended to help the user in understanding the influence of essential input for the design of test pieces. Practical trials of NDT systems play an important role in the qualification of both inspection procedures and inspection personnel. RP5 addresses consecutively the design of practical trials, test piece design and test piece fabrication. RP6: The Use of Modelling in Inspection Qualification – Issue 3
ENIQ report no. 57
The main objective of RP6 is to advice inspection vendors and NDT engineers on how to use modelling to develop inspection techniques and on how to use modelling results in TJs. It also supports licensees and qualification bodies to assess modelling results if they are used in a TJ. The document includes descriptions of models and provides examples on how they can be used as part of substantiation of an inspection. Restrictions in using modelling and measures which should be applied are also addressed.
Issue 3 of RP6 includes a section on simulation of qualifications and a stronger link to RP10 “Personnel Qualification” has been made to emphasise the increasing use of modelling for training and maintaining proficiency of ISI personnel. Also a section on probability-ofdetection (PoD) curves has been included as they are more commonly used to access influence of parameters.
RP7: Recommended General Requirements for a Body Operating Qualification of Non-
Destructive Tests – Issue 2
ENIQ report no. 58
RP7 provides guidance on the minimum criteria that a body operating qualification of NDT should follow if it is to be recognised as impartial, independent of operational pressures, competent and reliable. Three types of QB are considered within this RP:
- Type 1: A QB which is an independent third party organisation;
- Type 2: A QB which is an independent part of the utility’s organisation set up on a permanent or long-term basis;
- Type 3: An ad-hoc QB set up for a specific qualification.
RP7 is mainly intended to provide guidance on the requirements for qualification bodies with a permanent organisational structure (types 1 and 2). Ad-hoc qualification bodies (type 3), being more temporary and inspection-specific in nature, will generally be established in a less formal way. However, many parts of RP7 still provide useful guidance to those wishing to set up an ad-hoc QB.
RP8: Qualification Levels and Approaches – Issue 2
ENIQ report no. 59
RP8 is intended to provide guidance on the setting of qualification level and on determining the qualification approach based partly on this choice of level. The qualification level reflects the assurance required that the inspection will attain its objectives. This will largely depend on the safety significance of the component and the role of the inspection in assuring structural integrity. In practice, qualification can be done with varying degrees of complexity and cost. The way such work is carried out is defined in this document as the “qualification approach”, and needs to take into account both the structural integrity significance and the difficulty of each specific inspection. The qualification approach determines to what extent the various aspects of qualification, i.e. TJ, open trials, blind trials etc., are included in a particular case.
Issue 2 of RP8 contains clear definitions of qualification levels & qualification approaches and examples from different countries, showing the link between qualification levels and risk levels.
RP9: Verification and Validation of Structural Reliability Models and Associated Software to be used in Risk-Informed In-Service Inspection Programmes – Issue 2
ENIQ report no. 52
Structural Reliability Models (SRMs) are commonly used to evaluate failure probabilities in the development of RI-ISI programmes. RP9 summarises the verification and validation
requirements that a SRM and associated software should satisfy in order to be suitable for such programmes. These requirements are mainly based on the work performed within the NURBIM project.
RP10: Personnel Qualification – Issue 2
ENIQ report no. 60
RP10 is meant to assist those involved in the qualification of inspection personnel to meet the principal objective of personnel qualification, i.e. to ensure that those carrying out an inspection are appropriately trained, experienced and examined to ensure the inspection is applied correctly and effectively. RP10 provides detailed guidance on how to conduct personal qualification, handle qualifications to be renewed, and defining the role and responsibilities of the parties involved.
In Issue 2 of RP10 a section on re-qualification & maintaining proficiency of ISI personnel was added and a stronger link to RP6 has been made to emphasise the growing use of modelling
(virtual mock-ups) for training & qualification of ISI personnel.
RP11: Guidance on Expert Panels in Risk-Informed In-Service Inspection – Issue 2
ENIQ report no. 53
RP11 is meant to assist users of RI-ISI applications in how to form, prepare, conduct and facilitate an expert panel as a part of a RI-ISI process. It gives guidance on responsibilities, composition, planning, conduct and documentation of the expert panel.
The new issues of the ENIQ guidance documents and all other ENIQ publications (e.g. technical reports, position papers / discussion documents) can be downloaded from the NUGENIA website HERE.