And they eat them up, which means that, combined with the fact that the cladding doesn't last very long, you can only run one of these reactors for roughly, say, 18 months without refueling it.
中性子が食われてしまうことや 被覆材も それほど長持ちしないことからも 燃料補給なしに稼働できるのは せいぜい 18ヶ月といったところです