Multiple Failure Accident Sequences for SEAFP Reactor

This paper summarizes several investigations on the identification of possible multiple failure accidents relevant in terms of consequences for the SEAFP reactor. Particularly, on those sequences of events that could induce a risk of radioactive materials bypass through the SEAFP confinement barriers. The analyses here reported are related to the Heat Transfer Systems of both reactor models 1 and 2. The work is carried out within the Safety and Environmental Assessment of Fusion Power—Long Term Programme (SEAL) 95/96. A set of specific initiating events (IEs) has been individuated, on the basis of the previous studies performed in the frame of the first SEAFP program. Basing on pre-existing analyses, each accident initiator has been discussed and several sequences have been described depending on the additional failures which could follow the initiator.