OBJECTIVES
DOE-HDBK-1019/2-93
Reactor Theory (Nuclear Parameters)
TERMINAL OBJECTIVE
2.0
From memory, EXPLAIN how reactivity varies with the thermodynamic properties of
the moderator and the fuel.
ENABLING OBJECTIVES
2.1
EXPLAIN the conditions of over moderation and under moderation.
2.2
EXPLAIN why many reactors are designed to be operated in an under moderated
condition.
2.3
STATE the effect that a change in moderator temperature will have on the moderator to
fuel ratio.
2.4
DEFINE the temperature coefficient of reactivity.
2.5
EXPLAIN why a negative temperature coefficient of reactivity is desirable.
2.6
EXPLAIN why the fuel temperature coefficient is more effective than the moderator
temperature coefficient in terminating a rapid power rise.
2.7
EXPLAIN the concept of Doppler broadening of resonance absorption peaks.
2.8
LIST two nuclides that are present in some types of reactor fuel assemblies that have
significant resonance absorption peaks.
2.9
DEFINE the pressure coefficient of reactivity.
2.10
EXPLAIN why the pressure coefficient of reactivity is usually negligible in a reactor
cooled and moderated by a subcooled liquid.
2.11
DEFINE the void coefficient of reactivity.
2.12
IDENTIFY the moderator conditions under which the void coefficient of reactivity
becomes significant.
NP-03
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