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It's done remotely, behind shielding, in this device:
Flattop is a benchmark critical assembly that is used to study the nuclear characteristics of uranium-233, uranium-235, and plutonium-239 in spherical geometries surrounded by a relatively thick natural uranium reflector.
https://en.wikipedia.org/wiki/Flattop_%28critical_assembly%29
https://en.wikipedia.org/wiki/Flattop_%28critical_assembly%29
The core of the KRUSTY space power system was tested in this machine before full power testing of the prototype.
https://www.nasa.gov/press-release/demonstration-proves-nuclear-fission-system-can-provide-space-exploration-power
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