A comprehensive approach of reactor safety research aiming at elimination of recriticality in CDA for commercialization of LMFBR

This paper discusses requirement and necessity for elimination of recriticality issue in hypothetical core disruptive accident in future fast reactors, and also necessity of a new comprehensive approach of safety research to achieve this objective. A theoretical investigation of the initiating phase consequences in an unprotected loss-of-flow accidents is shown as an example. A generalized model for core behavior is developed in order to clarify a requirement for mechanism to introduce a negative reactivity (controlled material relocation concept) aiming at elimination of recriticality.