Keywords: WWER reactors, spent fuel management, spent fuel assembly, nuclear inventory, depletion calculation, depletion comparison, nuclear waste management, nuclear power plants, nuclear energy, nuclear safety, criticality analysis, burn-up credit, Bulgaria
Burn-up credit methodology validation in Bulgaria
A methodology for criticality safety analyses with burn-up credit application has been developed for the WWER spent fuel management facilities. This methodology is based on two worldwide-used code systems: SCALE 4.4 for depletion and criticality calculations and NESSEL-NUKO for depletion calculations. The methodology is in the process of extensive validation for WWER-440 and WWER-1000 spent fuel assembly depletion analysis-based comparisons with other depletion codes calculation results, as well as with appropriate and reliable experimental data.