prompt critical

英語（米国） (en-US) 英語（イギリス） (en-GB)

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(nuclear physics) Of the point where the prompt neutrons produced by a nuclear fission chain reaction are just sufficient to sustain the chain reaction on their own, past which changes in reaction power occur on a timeframe of milliseconds, too rapidly for a human operator to control.

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During the safety test the reactor briefly became prompt critical, and the ensuing power rise happened on a millisecond timescale that operators could not control.

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意味（1）

(nuclear physics) Of the point where the prompt neutrons produced by a nuclear fission chain reaction are just sufficient to sustain the chain reaction on their own, past which changes in reaction power occur on a timeframe of milliseconds, too rapidly for a human operator to control.

The number of fissions in the two prompt critical excursions was estimated from (1) the doses received by the operator and shift supervisor and (2) the measured exposure rate from fission product gamma–rays (1.5 mR/s at 3 m from the vessel, 1 hour after the last excursion).

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