Non-destructive evaluation and correlation with the mechanical properties to obtain embrittlement degradation of RPV materials within the NOMAD project

Research output: Contribution to report/book/conference proceedingsIn-proceedings paperpeer-review


Institutes & Expert groups

  • PSI - Paul Scherrer Institute
  • VTT - Technical Research Centre of Finland Ltd.
  • Coventry University - Institute for Future Transport and Cities

Documents & links


The objective of NOMAD is to develop a tool that is capable to non-destructively evaluate the degree of neutron induced embrittlement of the RPV. The final NDE system (outside the NOMAD scope) should be capable of inspecting the degradation of the microstructure through the cladding. Therefore, a combination of several techniques based on micro-magnetic, electrical and ultrasonic methods was investigated. They were first calibrated on a set of existing (CHIVAS-x) and newly irradiated (NOMAD_3) Charpy samples from a variety of RPV materials irradiated in different conditions. In addition, large blocks with and without cladding of one RPV material were irradiated in the BR2 reactor to a large range of neutron fluences in the NOMAD_1 and _2 campaign. They were measured by the most promising NDT techniques to mimic the actual field conditions. To be independent of the irradiation conditions, the damage parameter metrics is defined as the ductile-to-brittle transition temperature (DBTT) which is characteristic of the material microstructure. This paper gives an overview of the status of the NOMAD project with focus on the evaluation and correlation between the mechanical properties and non-destructive parameters. NDE results from 6 NDE set-ups enabling the measurement of 28 parameters were compared to the DBTT results measured using Charpy impact tests. A selection of all results are presented and discussed together with some recommendations for future investigations.


Original languageEnglish
Title of host publicationProceedings of ASME 2022 Pressure Vessels & Piping Conference - PVP2022
PublisherASME - The American Society of Mechanical Engineers
Number of pages19
Publication statusPublished - 4 Sep 2022
Event2022 - Pressure Vessels & Piping Conference - Las Vegas, United States
Duration: 17 Jul 202222 Jul 2022


Conference2022 - Pressure Vessels & Piping Conference
Abbreviated titlePVP22
Country/TerritoryUnited States
CityLas Vegas
Internet address


  • NDE, Embrittlement, LTO, DBTT, Charpy

ID: 7929548