FIELD: nuclear power engineering. SUBSTANCE: nuclear reactor has core, reflector built up of claddings made of material with open pore structure penetrable for gaseous substances only. Claddings are filled with heat-absorbing material with temperature of phase transition to gaseous state below maximum permissible point affording durable strength of reactor structural members and above coolant temperature at core under normal conditions. Coolant inlet and outlet in reflector are made, respectively, below and above core and communicate with uptake section of coolant circulating circuit. EFFECT: improved safety of nuclear reactor. 2 cl, 1 dwg
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