Impact of molybdenum cross sections on FHR analysis

Kyle M. Ramey; Marat Margulis; Nathaniel Read; Eugene Shwageraus; Bojan Petrovic

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자료유형: 학술저널

저자정보: Kyle M. Ramey (Nuclear and Radiological Engineering, Georgia Institute of Technology) Marat Margulis (Department of Engineering, University of Cambridge) Nathaniel Read (Department of Engineering, University of Cambridge) Eugene Shwageraus (Department of Engineering, University of Cambridge) Bojan Petrovic (Nuclear and Radiological Engineering, Georgia Institute of Technology)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제3호

발행연도: 2022.3

수록면: 817 - 825 (9page)

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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.

#Molten salt reactor (MSR) #Fluoride salt cooled high temperature reactor (FHR) #Molybdenum cross section #Serpent #WIMS

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