The Power Reactor Inherently Safe Module (PRISM), GE Hitachi Nuclear Energy's high-energy (fast) neutron reactor design, has recently gained prominence as a contender to provide a solution to the disposition of the United Kingdom's plutonium stockpile, but the design itself has been in a fairly mature state for several years. It arose from work begun in the 1980s, and extends concepts that were developed starting in the 1950s. Before the newest chapter in PRISM's story is presented, the earlier chapters are summarized to provide some perspective on the current situation.
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