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Local correlated sampling Monte Carlo calculations in the TFM neutronics approach for spatial and point kinetics applications

These studies are performed in the general framework of transient coupled calculations with accurate neutron kinetics models. This kind of application requires a modeling of the influence on the neutronics of the macroscopic cross-section evolution. | Local correlated sampling Monte Carlo calculations in the TFM neutronics approach for spatial and point kinetics applications EPJ Nuclear Sci. Technol. 3 16 2017 Nuclear Sciences A. Laureau et al. published by EDP Sciences 2017 amp Technologies DOI 10.1051 epjn 2017011 Available online at http www.epj-n.org REGULAR ARTICLE Local correlated sampling Monte Carlo calculations in the TFM neutronics approach for spatial and point kinetics applications Axel Laureau Laurent Buiron and Bruno Fontaine CEA DEN DER Cadarache 13108 Saint-Paul Les Durance Cedex France Received 11 November 2016 Received in final form 4 March 2017 Accepted 4 April 2017 Abstract. These studies are performed in the general framework of transient coupled calculations with accurate neutron kinetics models. This kind of application requires a modeling of the influence on the neutronics of the macroscopic cross-section evolution. Depending on the targeted accuracy this feedback can be limited to the reactivity for point kinetics or can take into account the redistribution of the power in the core for spatial kinetics. The local correlated sampling technique for Monte Carlo calculation presented in this paper has been developed for this purpose i.e. estimating the influence on the neutron transport of a local variation of different parameters such as sodium density or fuel Doppler effect. This method is associated to an innovative spatial kinetics model named Transient Fission Matrix which condenses the time-dependent Monte Carlo neutronic response in Green functions. Finally an accurate estimation of the feedback effects on these Green functions provides an on-the-fly prediction of the flux redistribution in the core whatever the actual perturbation shape is during the transient. This approach is also used to estimate local feedback effects for point kinetics resolution. 1 Introduction without new reference calculation during the transient and thus with a reduced computation time. The TFM approach The .