Novel hybrid Monte Carlo/deterministic technique for shutdown dose rate analyses of fusion energy systems |
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| Affiliation: | 1. Department of Energy System Engineering, Seoul National University, Seoul, Republic of Korea;2. Center for Advance Research in Fusion Reactor Engineering, Seoul National University, Seoul, Republic of Korea;3. ITER Korea, National Fusion Research Institute, Daejeon, Republic of Korea;4. ITER Organization, Route de Vinon sur Verdon, 13115 Saint Paul-lez-Durance, France;1. VTT Technical Research Centre of Finland, P.O. Box 1300, FI-33101 Tampere, Finland;2. Tampere University of Technology, Korkeakoulunkatu 6, 33720 Tampere, Finland;1. Karlsruhe Institute of Technology, 76344, Karlsruhe, Germany;2. EURATOM/CCFE Fusion Association, Culham Science Centre Abingdon, Oxfordshire OX14 3DB, UK;1. Association KIT-Euratom, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany;2. European Fusion Development Agreement (EFDA), Garching, Germany;3. Association IPPLM-Euratom, IPPLM Warsaw/INP Krakow, Poland;4. Universidad Nacional de Educación a Distancia (UNED), Madrid, Spain;5. Fusion for Energy (F4E), Barcelona, Spain;6. MESCS-JSI, Ljubljana, Slovenia;7. CEA, DEN, Saclay, DM2S, SERMA, F-91191 Gif-sur-Yvette, France;8. Associazione ENEA-Euratom, ENEA Fusion Division, Frascati, Italy;9. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain;10. Budapest University of Technology and Economics (BME), Budapest, Hungary;11. Euratom/CCFE Fusion Association, Culham Science Centre for Fusion Energy (CCFE), Culham, UK;1. University of Wisconsin-Madison, Madison, WI, USA;2. Sandia National Laboratories, Albuquerque, NM, USA |
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| Abstract: | The rigorous 2-step (R2S) computational system uses three-dimensional Monte Carlo transport simulations to calculate the shutdown dose rate (SDDR) in fusion reactors. Accurate full-scale R2S calculations are impractical in fusion reactors because they require calculating space- and energy-dependent neutron fluxes everywhere inside the reactor. The use of global Monte Carlo variance reduction techniques was suggested for accelerating the R2S neutron transport calculation. However, the prohibitive computational costs of these approaches, which increase with the problem size and amount of shielding materials, inhibit their ability to accurately predict the SDDR in fusion energy systems using full-scale modeling of an entire fusion plant. This paper describes a novel hybrid Monte Carlo/deterministic methodology that uses the Consistent Adjoint Driven Importance Sampling (CADIS) method but focuses on multi-step shielding calculations. The Multi-Step CADIS (MS-CADIS) methodology speeds up the R2S neutron Monte Carlo calculation using an importance function that represents the neutron importance to the final SDDR. Using a simplified example, preliminary results showed that the use of MS-CADIS enhanced the efficiency of the neutron Monte Carlo simulation of an SDDR calculation by a factor of 550 compared to standard global variance reduction techniques, and that the efficiency enhancement compared to analog Monte Carlo is higher than a factor of 10,000. |
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| Keywords: | Shutdown dose rate Hybrid Monte Carlo/deterministic Multi-step shielding analysis |
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