“…Because the JET vacuum vessel (VV) contains complex demineralized water coolant systems for plasma facing components and the divertor, the in-vessel LOCA (loss of coolant accident) has been identified as one of the worst accidental scenarios in each safety case reviews [2]. A LOCA analysis using the CEA developed thermal hydraulics code CATHARE 2 V25-2 has been conducted to update the analysis in the PCSR using "state of the art" software.…”