Modeling of Spray System Operation under Hydrogen and Steam Emissions in NPP Containment during Severe Accident

Abstract EN

The paper describes one of the variants of mathematical models of a fluid dynamics process inside the containment, which occurs in the conditions of operation of spray systems in severe accidents at nuclear power plant.

The source of emergency emissions in this case is the leak of the coolant or rupture at full cross-section of the main circulating pipeline in a reactor building.

Leak or rupture characteristics define the localization and the temporal law of functioning of a source of emergency emission (or accrued operating) of warmed up hydrogen and steam in the containment.

Operation of this source at the course of analyzed accident models should be described by the assignment of the relevant Dirichlet boundary conditions.

Functioning of the passive autocatalytic recombiners of hydrogen is described in the form of the complex Newton boundary conditions.