Journal
NUCLEAR ENGINEERING AND DESIGN
Volume 401, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.nucengdes.2022.112045
Keywords
Spreading; Corium; Lava; Severe accidents; Simulation
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A viscoplastic model for lava is proposed in this paper, which is applied to the spreading of corium with dimensionless numbers. The model considers the tridimensional flow as non-Newtonian and non-isothermal. Simulations are conducted using an adaptive finite element method based on C++ library Rheolef, and the results are compared with the VEU7 corium spreading test. A sensitivity analysis is also performed on the viscoplastic parameters of corium. The tridimensional solution is computed from the bidimensional height-averaged solution.
A viscoplastic model for lava is presented, and its use for corium spreading is argued with dimensionless numbers. It describes the tridimensional flow as non-Newtonian and non-isothermal. Using an adaptive finite element method based on C++ library Rheolef, simulations are ran and compared to the VEU7 corium spreading test. A sensitivity analysis on the viscoplastic parameters of corium that are not well-known is conducted. Tridimensional solution of the problem is computed from the bidimensional height-averaged solution.
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