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[en] Phenomena of importance to the behaviour of high burnup fuel subjected to conditions of rapid overpower (i.e., LWR RIAs) include the change in cladding material properties due to irradiation, pellet-clad interaction (PCI) and 'rim' effects associated with the periphery of high burnup fuel. 'Rim' effects are postulated to be caused by changes in fuel morphology at high burnup. Typical discharge burnups for CANDU fuel are low compared to LWRs. Maximum linear ratings for CANDU fuel are higher than those for LWRs. However, under normal operating conditions, the Zircaloy-4 clad of the CANDU fuel is collapsed onto the fuel stack. Thus, the CANDU fuel performance codes model the transient behaviour of the fuel-to-clad interface and are capable of assessing the potential for pellet-clad mechanical interaction (PCMI) failures for a wide range of overpower conditions. This report provides a discussion of the modelling of the phenomena of importance to high burnup fuel behaviour during rapid overpower transients. (author)
Source
Canadian Nuclear Society, Toronto, Ontario (Canada); 830 p; ISBN 0-919784-53-4; 
; 1995; v. 2 [12 p.]; CANDU fuel: safe, reliable, economical; Pembroke, ON (Canada); 1-4 Oct 1995; 33 refs., 7 figs.
; 1995; v. 2 [12 p.]; CANDU fuel: safe, reliable, economical; Pembroke, ON (Canada); 1-4 Oct 1995; 33 refs., 7 figs.