Reactivity feedback coefficients of a low enriched uranium fuelled material test research reactor at end-of-life

► The isotopic concentration in the fuel changes as soon as it starts its operation. ► The neutronic properties of a reactor also change with fuel burnup. ► The reactivity feedbacks at end-of-life of a material test reactor fuelled with low enriched uranium fuel are calculated. ► Codes used include WIMS-D4 and CITATION.