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| breeder reactor |
a nuclear reactor that is designed to produce more fissionable material than it consumes, and thus generate additional fuel for its own operation. |
| converter reactor |
a nuclear reactor that produces less, or a different kind of, fissionable material than it consumes. (Cf. breeder reactor.) |
| critical mass |
the minimum mass of fissionable material necessary to sustain a nuclear chain reaction. [1/2 definitions] |
| nonfissionable |
combined form of fissionable. |
| uranium |
a radioactive chemical element that has ninety-two protons in each nucleus and that occurs in pure form as a heavy silvery-white metal, used as a fissionable nuclear fuel. (symbol: U) |
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