SYSTEM OF PASSIVE HEAT REMOVAL VIA ONCE-THROUGH STEAM GENERATOR AND METHOD FOR FILLING IT Russian patent published in 2023 - IPC G21C15/00 

FIELD: nuclear energy.

SUBSTANCE: invention relates to passive heat removal systems (PHRS) of a nuclear reactor with a heavy liquid metal coolant (HLMC) through a steam generator (SG) operating in a once-through mode. In the proposed system, a direct-acting shut-off and control device is installed on the pipeline for draining condensate from the cooldown heat exchanger, which is configured for switching to the closed state under normal operating conditions in power modes by feed water pressure or by the force of an electromagnet. To fill the SF PHRS with the working medium, the steam supply valve to the second circuit with dried SG is opened and steam is supplied with a pressure exceeding the saturation pressure at a temperature above the HLMC melting point by a predetermined value that is greater than the saturation pressure corresponding to the HLMC temperature provided by the heating system, but below the pressure at which valve opens.

EFFECT: increased safety of the operation of the reactor unit and the efficiency of the PHRS in the absence of external energy sources, while eliminating the possibility of solidification of the HLMC with a decrease in the residual heat output.

12 cl, 4 dwg