2 gas powered generating unit 110 which generates electrical and or hydraulic power which is used to power a cooling compressor refrigeration unit 118 making the closed loop operation efficient under non emergency operation conditions the u201c spent u201d gaseous n 2 from n 2 gas powered generating unit 110 is cycled back to cooling compressor refrigeration unit 118 through a loop including a accumulator tank for n 2 gas 116 which increases efficiency by reducing the amount of atmospheric filtering required by cooling compressor refrigeration unit 118 to deliver liquid nitrogen n 2 to liquid n 2 storage tank 102 in addition the n 2 can be used to decontaminate equipment on site without removal of said equipment under non emergency operation conditions n 2 gas powered generating unit 110 also supplies electrical energy to an electrical energy storage system 114 for use during emergency operation conditions in an embodiment under non emergency operation conditions n 2 gas powered generating unit 110 also supplies electrical energy to a hydraulic system 112 for use during emergency operation conditions e g to operate valves and other equipment independently of electrical mechanisms this assists to keep hydraulic psi of the n 2 at a workable state when at rest under emergency operation conditions an activation mechanism 120 operates in a u201c fail safe u201d manner automatically applying liquid nitrogen to a heat exchanger drop system 106 when the heat in the reactor rises above a pre determined threshold the nitrogen cooling system is descended into the reactor by the drop system with further reference to fig2 a and 2b under emergency operation conditions an emergency drop system 105 is triggered to bring heat exchanger 106 into proper position to cause cooling of the nuclear power plant the drop.