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 | | Nuclear reactors are used for providing heat for electricity generation, domestic and industrial heating, desalination, and naval propulsion, for providing neutron beams for research purposes, and for making radioactive isotopes. |
 | | Thermal (slow) reactors are composed of fuel (fissionable material), moderating materials to slow neutrons to low velocities (to prevent capture by U238), heavy-walled pressure vessels to house reactor components, shielding to protect personnel, systems to conduct heat away from the reactor, and instrumentation for monitoring and controlling the reactor's systems. |
 | | Additional reactors were used in the navy (United States Naval reactor) In the mid-1950s, both the Soviet Union and western countries were expanding their nuclear research to include non-military uses of the atom. |
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