For low enriched uranium fuel working on a thermal neutron spectrum, the difference between the average and effective delayed neutron fractions can reach 50 pcm.
2.
This delayed neutron fraction, on the order of 0.007 for uranium, is crucial for the control of the neutron chain reaction in one dollar of reactivity.
3.
For low enriched uranium fuel working on a thermal neutron spectrum, the difference between the average and effective delayed neutron fractions can reach 50 pcm ( 1 pcm = 1e-5 ).
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