Question R12 Q21 - NSB 2011 Set 4

Nuclear reactions, such as those that occur in power generating reactors, are said to be critical when:

W) They are able to sustain their level of activity without an external neutron source

X) They have been shut down by the introduction of neutron poisons such as boron

Y) They are increasing in power at a rate faster than expected

Z) They are producing more thorium than uranium

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