New types of reactors were designed, including the Fast Breeder reactor powered by plutonium and cooled by liquid sodium.
新型的反应堆被设计出来，包括由钚提供能量，液态钠参与冷却的快中子增殖反应堆。
2
The Soviet RORSAT radar satellites were powered by a NaK-cooledreactor. Apart from the wide liquid temperature range, NaK has a very low vapor pressure, important in the vacuum of space.