الفهرس 
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Abstract
reactor can get permission for working, if we are able to ~ that even a prompt supercritical state can’t result in a vity accident leading to core damage. Thus, we need a uter models simulating this accident. A power excursion ent is stopped only by the feedback through the temperature icients. For this purpose a 3D neutroniclthermalhydraulics -time model has been built for research reactors and the ing equations has been solved numerically. The results y concluded that the reactor is inherently safe for a prompt
vity 1.2$.