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・ Critical thermal maximum
・ Critical thinking
・ Critical Times – Fishbone's Hen House Sessions
・ Critical to quality
・ Critical understanding
・ Critical value
・ Critical variable
・ Critical velocity
・ Critical vocabulary
・ Critical Watch
・ Critical Wave
・ Critical Zone Observatory
・ Critical-Creative Thinking and Behavioral Research Laboratory
・ CriticalBlue
・ Criticality
Criticality (status)
・ Criticality accident
・ Criticality index
・ Criticality matrix
・ Critically Ashamed
・ Critically endangered
・ Critici sacri
・ Criticism
・ Criticism and sonata form
・ Criticism of advertising
・ Criticism of Akira Kurosawa
・ Criticism of Amnesty International
・ Criticism of AOL
・ Criticism of Apple Inc.
・ Criticism of atheism


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Criticality (status) : ウィキペディア英語版
Criticality (status)
Criticality is the state of a nuclear chain reacting medium when the chain reaction is just self-sustaining (or critical), that is, when the reactivity is zero. The term may also be applied to states in which the reactivity is greater than zero.
==Applications==
In the context of a nuclear reactor, particularly in a nuclear power plant, criticality refers to the normal operating condition of a reactor, in which nuclear fuel sustains a fission chain reaction. A reactor achieves criticality (and is said to be critical) when each fission event releases a sufficient number of neutrons to sustain an ongoing series of reactions.
The International Atomic Energy Agency also defines the ''first criticality date'' as the date when the reactor is made critical for the first time. This is an important milestone in the construction and commissioning of a nuclear power plant. For example, Qinshan 1, China's first domestically designed and constructed nuclear power plant, achieved first criticality on 31 October 1991.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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