Implementation of a new burnup solver based on the Krylov subspace method in SCOPE2

摘要

A new burnup solver based on the Krylov subspace method is implemented in SCOPE2, a next-generation core calculation code. The validity of the microscopiccorrection model for representation of multi-group cross sections and implementation of a new burnup solver was shown in results of verification and validation calculations. While superiority of the microscopiccorrection model was shown in off-nominal conditions with large deviation from the base condition in lattice calculation, the macroscopic model also performs well for core tracking calculation of Japanese commercial PWRs with the current operation condition.