reactor core

noun
core1 ( def 11 ).
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Without coolant, the temperature in the reactor core will rise unchecked.
As it decays in a reactor core, its byproducts produce more neutrons per
  collision than conventional fuel.
In this system, the heat is always generated in about the same area within the
  reactor core-near the center.
In naval nuclear propulsion plants, fissioning of uranium atoms in the reactor
  core produces heat.
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