Abstract
Studsvik’s CASMO5 lattice physics code is validated against neutron kinetics experiments performed at the Tank-Type Critical Assembly (TCA) and the IPEN/MB-01 reactor. For the TCA measurements, CASMO5 agreed with βeff/Λ within 3%. For the IPEN/MB-01 measurements, CASMO5 computed the effective delayed neutron fraction βeff and the mean neutron generation time Λ to within 3.6σ of the measurement error. The ENDF/B-VII.1 and JENDL-4.0 delayed neutron data gave the best results for βeff, followed by Tuttle and then the eight-group JEFF-3.2. CASMO5′s predicted reactivity ρ versus reactor period was mostly within 5% using Tuttle, JENDL-4.0, or JEFF-3.2 delayed neutron data. However, using ENDF/B-VII.1 resulted in poorer reactivity predictions, with errors up to 50%. All CASMO5 kinetics parameters are based on a recently-developed transport-based adjoint capability, which relies on the Method of Characteristics with Linear Source approximation for the solution of the two-dimensional transport equation.
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