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← ScienceWhich risk increases when heavy water moderator purity degrades?
A)Reactor core radiative neutron capture✓
B)Increased tritium production from contaminants
C)Doppler broadening affecting neutron moderation
D)Elevated breeding of fissile isotopes
💡 Explanation
Neutron moderation efficiency falls because protium absorbs neutrons more readily than deuterium. Reactor core radiative neutron capture increases non-fissile isotope formation; therefore the reactor efficiency declines, rather than breeding as protium replaces deuterium in the heavy water.
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