Samuel Untermyer II, (25 November 1912 – 26 January 2001) was an American nuclear scientist.
Samuel Untermyer II theorized that steam bubble formation in a nuclear reactor core would not produce unstable reactions, but would instead result in an inherently stable and self-controlling reactor design.
This was eventually proved in the BORAX experiments, which led to the design of the Boiling water reactor.
In recognition of his fundamental development work on water-cooled reactors, the American Nuclear Society now has an award named after him for work in this field.
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