| CPC B23P 15/26 (2013.01) [B21C 23/00 (2013.01); F28B 1/06 (2013.01); F28B 9/10 (2013.01); F28D 1/024 (2013.01); F28D 7/10 (2013.01); F28F 1/003 (2013.01); F28F 1/16 (2013.01); F28F 1/20 (2013.01); F28F 2215/04 (2013.01); F28F 2275/125 (2013.01); Y10T 29/4938 (2015.01); Y10T 29/49393 (2015.01)] | 15 Claims |

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1. A system for removing thermal energy generated by radioactive materials comprising:
an air-cooled heat exchanger defining a vertical axis and comprising a vertically oriented shell defining a cavity containing a plurality of heat exchange tubes fluidly coupled between a top fluid inlet header and a bottom fluid outlet header;
the air-cooled heat exchanger comprising a heat rejection closed-loop fluid circuit comprising a tube-side fluid path, a coolant fluid flowing through the heat rejection closed-loop fluid circuit, the heat rejection closed-loop fluid circuit thermally coupled to the radioactive materials so that thermal energy generated by the radioactive materials is transferred to the coolant fluid; and
the air-cooled heat exchanger comprising a shell-side fluid path inside the shell having a first air inlet formed through the shell, a second air inlet formed through the shell, and an air outlet formed through the shell, the first air inlet located at a first elevation, the second air inlet located at a second elevation, and the air outlet located at a third elevation, the second elevation greater than the first elevation and the third elevation greater than the second elevation, the air-cooled heat exchanger transferring thermal energy from the coolant fluid flowing through the tube-side fluid path to air flowing through the shell-side fluid path.
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