Containment hypotheses and conservative accident consequence analyses for SEAFP-2

Conservative analysis has been performed of the potential consequences to the public of hypothetical loss-of-coolant accidents in a conceptual fusion power plant design. The effect on these consequences of variations in the containment design has also been investigated. In order to establish upper bounds to these consequences, a case has been studied in which total loss of all active cooling has been assumed, with no remedial intervention for the duration of the accident sequence. The analysis is based on the Plant Model 3 conceptual design from the European SEAFP-2 Safety Study. Based on conservative assumptions, mobilization, release and dose calculations show that, with straightforwardly achievable containment specifications, potential maximum doses to the public are likely to be well below the levels at which evacuation might be considered. (authors)