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Impact of molybdenum cross sections on FHR analysis
Kyle M. Ramey,Marat Margulis,Nathaniel Read,Eugene Shwageraus,Bojan Petrovic 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
A recent benchmarking effort, under the auspices of the Organization for Economic Cooperation andDevelopment (OECD) Nuclear Energy Agency (NEA), has been made to evaluate the current state ofmodeling and simulation tools available to model fluoride salt-cooled high temperature reactors (FHRs). The FHR benchmarking effort considered in this work consists of several cases evaluating the neutronicparameters of a 2D prismatic FHR fuel assembly model using the participants’ choice of simulation tools. Benchmark participants blindly submitted results for comparison with overall good agreement, exceptfor some which significantly differed on cases utilizing a molybdenum-bearing control rod. Participantsutilizing more recently updated explicit isotopic cross sections had consistent results, whereas thoseusing elemental molybdenum cross sections observed reactivity differences on the order of thousands ofpcm relative to their peers. Through a series of supporting tests, the authors attribute the differences asbeing nuclear data driven from using older legacy elemental molybdenum cross sections. Quantitativeanalysis is conducted on the control rod to identify spectral, reaction rate, and cross section phenomenaresponsible for the observed differences. Results confirm the observed differences are attributable to theuse of elemental cross sections which overestimate the reaction rates in strong resonance channels.