Analyses of the event of control rod withdrawal under low-power operation in "Fugen".

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Anticipated reactor transient events under low-power operation have become of interest after the Chernobyl Nuclear Power Plant accident. Therefor, in the present study, the analyses of the event of control rod withdrawal under low-power operation have been carried out for "Fugen", prototype advanced thermal reactor. Analyses have been performed by using EUREKA-2 code, a coupled nuclear thermal hydrodynamic kinetic code. As the result of the analyses, it is confirmed that the effect of coolant void reactivity is almost neglected and that the fuel entarpy is within the limint of established value in the principal guide of reactivity insertion events. In conclusion, there is no matter with control rod withdraw as under low-power operation in design base for "Fugen".