WPNCS Expert Group on Burn-up Credit Criticality Safety
This NEA expert group was set up to examine burn-up credit* as applied to criticality
safety in the transportation, storage, and treatment of spent fuel for
a wide range of fuel types, including UOX and MOX fuels for PWR, BWR,
and VVER.
Under
the guidance of the Working Party on Nuclear Criticality Safety, the
major assignments of the expert group include:
carrying out international comparison
exercises and benchmarks to assess the ability of code systems
to predict the reactivity of spent nuclear fuel systems, including
comparison with experimental data as available;
investigating the physics and predictability
of burn-up credit based on the specification and comparison of calculational
benchmark problems;
publishing the results for the benefit of criticality safety community, so
that the work may be used to help establish suitable safety margins.