Your 12-foot-long fuel rod full of those uranium pellet, lasts about six years in a reactor, until the fission process uses that uranium fuel up. Do reactor rods last forever Subnautica?Īnd just like any fuel, it gets used up eventually. Because all nuclear reactors in the United States require water to operate, you have to build one near a lake or a river (although it’s possible to construct an artificial lake, as with Dominion Generation’s North Anna Power Station in central Virginia).