Improvement of the resonance scattering treatment in MCNP in view of HTR calculations |
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| Authors: | B Becker R Dagan CHM Broeders GH Lohnert |
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| Affiliation: | 1. Institute for Reactor Safety (IRS), Forschungszentrum Karlsruhe GmbH, Postfach 3640, D-76021 Karlsruhe, Germany;2. Institute of Nuclear Technology and Energy Systems (IKE), University of Stuttgart, Pfaffenwaldring 31, D-70569 Stuttgart, Germany |
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| 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. |
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