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power excursion

   Also found in: Wikipedia 0.02 sec.
power excursion [′pau̇·ər ik‚skər·zhən]
(nucleonics)
A sudden increase in the power level of a nuclear reactor, caused by a sudden increase in reactivity.


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It is considered to be the worst nuclear power plant disaster in history, resulting in a severe release of radioactivity following a massive power excursion that destroyed the reactor.
The heat produced by the reactor limits its reactivity and therefore the reactor itself cannot run into an uncontrolled power excursion.
 
 
 
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