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• W1972424342 abstract "The importance of an advanced neutron scattering treatment for heavy nuclei with strong energy dependent cross-sections such as the pronounced resonances of 238U has been discussed in various publications where the full double differential scattering kernel was derived. In this study the double differential kernel is confirmed by a purely stochastic approach. We evaluate the impact of this improved resonance kernel on High Temperature Reactors (HTR) using the Monte Carlo Code MCNPX. A comparison between the standard MCNPX scattering kernel and the new one is introduced. For the analyzed HTR-10 unit cells the new kernel leads to a decrease in criticality of 170–600 pcm depending on TRISO packing factor and fuel temperature and to an increase in magnitude of the Doppler reactivity coefficient by about 10%. The 239Pu inventory increases by up to 2.5% at the end of cycle. Full core models of the test reactors HTR-10 and HTTR are analyzed. As expected the impact of the improved kernel is low for the HTR-10 because of an enhanced thermal flux. However, for the HTTR the effective multiplication factor decreases by 200–400 pcm and Doppler reactivity becomes more negative by 14%." @default.
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• W1972424342 date "2009-04-01" @default.
• W1972424342 modified "2023-10-18" @default.
• W1972424342 title "Improvement of the resonance scattering treatment in MCNP in view of HTR calculations" @default.
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• W1972424342 doi "https://doi.org/10.1016/j.anucene.2008.12.009" @default.
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