1st generation 2nd generation 3rd generation
Guardian PLUS7 HIPER
Batch burnup capability (MWd/MTU) “45,000” “55,000” “65,000”
Commercial supply date 2001 2006 2016
FR diameter (mm) 9.70 9.50 9.50
No. of spacer grids 11 12 11
No. of inert matrix fuels (IMFs) 0 0 2
Spacer grid spring Cantilever shape Conformal shape Long contact shape
Debris filter Single filter Multiple filters Long end plug
with debris filter