Super-homogenisation factors in pinwise calculations by the reactor dynamics code DYN3D

Super-homogenisation (SPH) factors were generated by a modified version of the code DYN3D for PWR fuel assemblies in hot-zero-power states defined in the OECD MOX/UO2 Benchmark. SPH factors averaged for each pin-material type and factors for each individual pin position were produced. The application of the SPH factors improves the accuracy of DYN3D calculations, especially for configurations with control rods inserted.

► We calculate super-homogenisation (SPH) factors for reactor core neutronics.
► SPH factors clearly improve accuracy for PWR states with control rods inserted.
► Pin-type-averaged cross sections and SPH factors are sufficient.