Fig. 4. Schematic of the nuclear-natural gas coupled-cycle. (1) OBMR reactor; (2) helium circulator; (3) heat exchanger; (4) underground silo; (5) air inlet; (6) mid-cooler; (7)natural gas; (8) combustor; (9) turbine; (10) heat recovery boiler; (11) gas outlet; (12) generator; (13) compressor; (14) steam turbine; (15) condenser; (16) feedwater pump.