A multivariate representation of compressed pin-by-pin cross sections

Since the 80’s, industrial core calculations employ two-step scheme based on prior cross sections preparation with few energy groups and in homogenized reference geometries. Spatial homogenization fuel assembly quarters is most frequent calculation option nowadays, relying efficient nodal solvers using a coarse mesh. Pin-wise reaction rates are then reconstructed by dehomogenization techniques. The future trend of moving however toward pin-by-pin explicit representations, where few-group single pins at many physical conditions nuclides selected for simplified depletion chains. resulting data model requires considerable memory occupation disk-files time needed to evaluate all exceeds limits practical feasibility multi-physics reactor calculations. In this work, we study compression Hotelling transform typical PWR assemblies. reconstruction these quantities different states addressed interpolation only compressed coefficients, instead interpolating separately each section. Savings higher than 90% observed, which result important gains runtime when data.