A CRITICAL REVIEW OF THE PRACTICE O F EQUATING THE REACTIVITY OF SPENT FUEL TO FRESH FUEL IN BURNUP CREDIT CRITICALITY SAFETY ANALYSES FOR PWR SPENT-FUEL POOL STORAGE

摘要

This research examines the practice of equating the reactivity of spent fuel to that of fresh fuel for the pur- pose of performing burnup credit criticality safety analy- ses for pressurized water reactor (PWR) spent-fuel pool (SFP) storage conditions. The investigation consists of comparing k_eff estimates based on reactivity " equiva- lent" fresh fuel enrichment (REFFE) to k_eff estimates using the calculated spent-fuel isotopics.