FIELD: nuclear reactors. SUBSTANCE: device has antechamber mounted under pressure tank that communicates through channel with entrapping chamber. Channel accommodates sealing partition destroyed by core melt in preset time interval upon its occurrence. Coolant tank also communicates with entrapping chamber through closing element destroyed by core melt. When this closing element is destroyed due to melting or cracking, coolant is squeezed out onto core melt in entrapping chamber and core melt is effectively cooled down. EFFECT: reduced steaming intensity in case core melt contacts water; provision for preventing inadmissible pressure rise within containment. 19 cl, 3 dwg
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