In this study kinetic parameters, effective delayed neutron fraction and
prompt neutron generation time have been investigated at different burn-up
stages for research reactor's equilibrium core utilizing low enriched uranium
high density fuel (U3Si2-Al fuel with 4.8 g/cm3 of uranium). Results have
been compared with reference operating core of Pakistan research Reactor-1.
It was observed that by increasing fuel burn-up, effective delayed neutron
fraction is decreased while prompt neutron generation time is increased.
However, over all ratio beff/L is decreased with increasing burn-up. Prompt
neutron generation time L in the understudy core is lower than reference
operating core of reactor at all burn-up steps due to hard spectrum. It is
observed that beff is larger in the understudy core than reference operating
core of due to smaller size. Calculations were performed with the help of
computer codes WIMSD/4 and CITATION.
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