atomic pile breaker breeder reactor bricks broncobuster buckaroo cattleman chain reactor chain-reacting pile cow keeper cowman dairy farmer dairyman equerry farrier fast pile furnace grazier groom heterogeneous reactor homogeneous reactor horseshoer hostler intermediate pile lattice neutron factory nuclear furnace pile plutonium reactor power reactor power-breeder reactor radioactive waste rancher ranchero ranchman reactor reactor pile rods sheepman slow pile stableboy stableman stellarator stock raiser stockbreeder stockkeeper stockman tamer trainer uranium reactor