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Enhancing Nuclear Safety


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Conservative approach for PWR MOX Burnup Credit implementation


Congress title :PHYSOR 2008
Congress location :Interlaken
Congress date :14/09/2008

Document type > *Congrès/colloque

Keywords > Burn-up credit, MOX, plutonium, PWR

Research Unit > IRSN/DSU/SEC/BERAC

Authors > AGUIAR Luis, CHECHIAK Benoît, JUTIER Ludyvine, LE BARS Igor, RABY Jérôme

Publication Date > 19/09/2008

Summary

Burnup Credit allows considering the reactivity decrease due to fuel irradiation in criticality studies for the nuclear fuel cycle. Its implementation requires to carefully analyze the validity of the assumption made to: define the axial profile of the burnup, determine the composition of the irradiated fuel and compute the criticality simulation.
In the framework of Burnup Credit implementation for PWR mixed oxide fuels (MOX), this paper focus on the determination of a conservative inventory of the irradiated fuel. The studies presented in this paper concern: the influence of irradiation conditions and of the MOX fuel initial composition on the irradiated MOX fuel reactivity. Criticality calculations are also performed for PWR MOX fuel industrial applications in order to get Burnup Credit gain estimations.

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