a. Reasons for the choice for the materials: dimensioning and fabrication, corrosion resistance, welding, control (see Modules B2-B3). b. Fabrication c. Feedback from plants : bolts cracking d. Irradiation effects : Dimensional stability, creep irradiation and possible swelling, materials hardening, microstructural evolution e. Irradiation Assisted Stress Corrosion Cracking (IASCC) (mechanisms of IASCC are introduced in Modules C23-C24) f. R and D program for predicting internals degradation, comparison with the strategy for vessels. g. International Practice for maintenance, repair and replacement.
Example of design evolution: internals for EPR in relation with vessel irradiation and fuel management