[2G10-14] Fuel Debris

[2G11] Modification of STACY for study of criticality characteristics of fuel debris

(7) Evaluations of reactivity effects of equipment in a core tank

*Satoshi GUNJI¹, Shouhei ARAKI¹, Masakazu SEKI¹, Kazuhiko IZAWA¹, Kenya SUYAMA¹ (1. JAEA)

Keywords:modified STACY, Critical Experiment, Critical Assembly, reactivity effect

For the start of critical experiments in the modified STACY, it is necessary to identify core tank components that have significant reactivity effects in order to make experimental core configurations. Therefore, reactivity effects of a few main in-core tank components which are expected having neutron absorption effects were evaluated by Monte Carlo computation. As the results, it was found that a few components have significant reactivities. Computation models for experimental designs need to take these components into account.