HKIE Professional Assessment - Nuclear Discipline Practice Questions - HKIE Professional Assessment - Nuclear Discipline (Hong Kong Institution Of Engineers) Exam

Why is Xenon-135 considered the most significant fission product neutron poison in thermal reactors?

It has an extraordinarily high thermal neutron absorption cross section of approximately 2.6 million barns It emits high-energy delayed neutrons that cause prompt criticality risks It acts as a strong positive temperature coefficient driver at high temperatures It decays via alpha emission with a very short half-life of 2.1 minutes

Correct Answer:

It has an extraordinarily high thermal neutron absorption cross section of approximately 2.6 million barns

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