Abstract
One of the most significant containment-related safety issues during a severe accident at a sodium fast reactor is a spray fire, as the high energy ejection and combustion of sodium can cause a sudden, large spike in containment pressure, and can possibly cause the containment building’s early failure. This paper discusses the incorporation sodium spray fire models into ASTEC-Na, a simulation tool currently under development by IRSN for sodium fast reactor severe accidents. An extensive comparison to past experimental results is included, and a new empirical model that describes the combustion phenomena for large flow sodium spray fires is developed. This paper also extends ASTECNa to a hypothetical core disruptive accident, and discusses a fire confinement suppression technique.
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