Abstract
In order to study the transient nucleate boiling on the fuel plate surface of a light-water-cooled and -moderated reactor when a sudden large reactivity is given to it, a fundamental experiment was made by means of stepped electrical heating of metal foil located in stagnant water under atmospheric pressure. From these studies, it is understood that the temperature overshoot of the metal surface from the saturation temperature of water and the delay time between passage of saturation temperature and the beginning of boiling, may, regardless of the degree of subcooling, be predicted in terms of the temperature rising velocity of the metal surface. With these results, it is possible to make a precise analysis of the light-water-cooled and -moderated reactor kinetics in case of the power excursion. (auth)
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