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Simplified 0-D semi-analytical model for fuel draining in molten salt reactors

A key feature of molten salt reactors is the possibility to reconfigure the fuel geometry (actively or passively driven by gravitational forces) in case of accidents. In this regard, the design of reference molten salt reactor of Generation IV International Forum, the MSFR, foresees the Emergency core Draining System (EDS). | Simplified 0-D semi-analytical model for fuel draining in molten salt reactors EPJ Nuclear Sci. Technol. 5 14 2019 Nuclear Sciences c F. Di Lecce et al. published by EDP Sciences 2019 amp Technologies https doi.org 10.1051 epjn 2019028 Available online at https www.epj-n.org REGULAR ARTICLE Simplified 0-D semi-analytical model for fuel draining in molten salt reactors Francesco Di Lecce 1 Antonio Cammi 2 Sandra Dulla 1 Stefano Lorenzi 2 and Piero Ravetto 1 1 Politecnico di Torino Dipartimento Energia NEMO group Torino Italy 2 Politecnico di Milano Department of Energy Nuclear Engineering Division Milano Italy Received 23 April 2019 Received in final form 15 July 2019 Accepted 26 August 2019 Abstract. A key feature of molten salt reactors is the possibility to reconfigure the fuel geometry actively or passively driven by gravitational forces in case of accidents. In this regard the design of reference molten salt reactor of Generation IV International Forum the MSFR foresees the Emergency core Draining System EDS . Therefore the research and development of MSFRs move in the direction to study and investigate the dynamics of the fuel salt when it is drained in case of accidental situations. In case of emergency the salt could be drained out from the core actively or passively triggered by melting of salt plugs and stored into a draining tank underneath the core. During the draining transient it is relevant from a safety point of view that thermal and mechanical damages to core internal surfaces and to EDS structure caused by the temperature increase due to the decay heat are avoided. In addition the subcriticality of the fuel salt should be granted during all the draining transients. A simplified zero-dimensional semi-analytical model is developed in this paper to capture the multiphysics interactions to separate and analyse the different physical phenomena involved and to focus on time evolutions of temperature and system reactivity. Results demonstrate that the .