反应堆级钚是指在反应堆中经过若干年燃烧后由铀-238经中子俘获和两次连续的β衰变生成的钚-239，再被嬗变成其它钚的同位素之后形成的混合物。
一项重大、颇受欢迎的进展是俄罗斯宣布将关闭最后一座武器级钚生产反应堆。
In a major and welcomed development, Russia announced that it will close its last weapons-grade plutonium production reactor.
美国和俄罗斯签署协议，计划处置68吨武器级放射性钚，将其做为民用核反应堆的燃料。
The United States and Russia signed an agreement to dispose of sixty-eight tons of weapons-grade plutonium. They plan to use the plutonium as fuel for civilian nuclear reactors.
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