Fast reactors-Fast reactors get their name from the fact that the neutrons released in the fission reaction are not slowed down as in a thermal reactor. Fast reactors contain a minimum of moderating material.A major advantage of this design stems from the fact that more neutrons are emitted during high-energy fission than during low-energy fission. Another important advantage follows from this total destruction of heavy atoms. A fast reactor produces much less long-lived radioactive waste than thermal reactors and ability to produce more fuel than it uses. However, today the vast majority of nuclear power is produced by thermal reactors.
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