Management of nickel-based alloy butt welds in the reactor coolant system of Belgian NPPs

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


  • Rik-Wouter Bosch
  • Frédéric Somville
  • Robert Gérard
  • S. Vancluysen
  • D. Bertolis
  • D. Martens
  • J. Bracke
  • Tractebel - Engie
  • Kerncentrale DOEL NPP - ENGIE Electrabel

Documents & links


Following the occurrence of PWSCC events in RPV outlet nozzles welds in V.C. Summer and Ringhals 3 and 4 NPPs in 2000, ENGIE Electrabel set up an enhanced ISI program specifically dedicated to RPV and pressurizer nozzles butt welds made of nickel-based alloy 182 in Doel 3-4 and Tihange 2-3 PWR units. Specific non-destructive examinations (NDE) carried out in this framework at an increased frequency did not reveal any PWSCC indications but some non-growing sub-surface indications have been detected. It was then decided to mitigate the risk of PWSCC in all pressurizer nozzles butt welds made of nickel-based alloy 182. The paper summarizes the strategy implemented by ENGIE Electrabel to manage the risk of PWSCC in those butt welds.


Original languageEnglish
Title of host publicationContribution of Materials Investigations and Operating Experience to Light Water NPPs’ Safety, Performance and Reliability
Number of pages9
Publication statusPublished - 17 Sep 2018
Event2018 - FONTEVRAUD 9 - Palais des Papes, Avignon , France
Duration: 17 Sep 201820 Sep 2018


Conference2018 - FONTEVRAUD 9
City Avignon
OtherContribution of Materials Investigations and Operating Experience to LWRs’ Safety, Performance and Reliability
Internet address


  • Nickel-based alloy, Pressurizer, Reactor Pressure Vessel, Structural Weld Overlay

ID: 4740252