UA81419C2 - Passive system for rejection of residual heat generation - Google Patents

Abstract

The invention relates to nuclear power engineering, in particular to passive systems of safety of nuclear power plants with water-moderated power reactors. Passive system of rejection of residual heat generation includes loop with natural circulation of heat carrier of first circuit, intermediate heat exchanger of emergency cooling on basis of two-phase thermo-siphons placed under hermetic shell, intermediate two-phase contour that provides heat discharge to atmosphere through air heat exchanger – condenser taken out of boundaries of hermetic shell and cooled with convective flow of external air. Assemblage of two-phase thermo-siphons of intermediate cooling heat exchanger is additional closed contour of heat transfer between radioactive first and intermediate contours. Under conditions of possible emergency unsealing of heat transfer surface at adding heat load thermo-siphon assembly does not make possible propagation of radioactivity out of boundaries of main safety barriers, this essentially increases reliability of system and ecological safety of reactor unit. Connection of passive system to reactor unit takes placed automatically with given time delay enough for operator intervention and for prevention of process of self cooling because of short-term de-energization, this prevents cooling of first circuit and jump of reactivity in active zone. The invention provides reliable rejection of residual heat generation at emergency cooling of reactor unit under conditions of total long-term, more than for an hour, de-energization and impossibility of connection of other outer sources of electric energy.