Revised Numerical Model for F2 Bubble Breakdown in Molten FLiBe and its Economics in the Fuel Cycle

Abstract

A one-dimensional numerical model of the breakdown for a fluorine bubble due to break-up and chemical reactions with dissolved UF₄ and PuF₄ in the molten salt reactor (MSR) volatilization process was revised. The updated model utilized a more realistic, 1.0 cm F₂ bubble to study the breakdown process in the idealized MSR fuel purification vessel. Although more accurate reaction interface and F₂ reactivity values were used, chemical reactions were still found to be the primary cause of bubble breakdown. The importance of efficiency in F₂ usage in the purification process on the economic and safety point of view was discussed.