In-service inspection (ISI) requirements for the internal components of reactor vessel in sodium-cooled fast reactors (SFRs) are to be determined by considering the following points: the opacity and chemical reactivity of sodium as a coolant, coupled with the design policy of avoiding sodium draining from the reactor vessel for safety reasons, significantly restrict access to components. However, degradation mechanisms well known are generally addressable through design modifications. This study focuses on developing a practical inspection logic for SFRs internal components of reactor vessel, incorporating practically applicable test methodologies and a risk-informed approach. We propose a method for establishing ISI requirements. Furthermore, a case study was shown for the demonstration reactor of SFR currently under design.
Yada et al. (Wed,) studied this question.