MELCOR model of divertor cooling loop and divertor ex-vessel LOCA analysis for the ITER plant

A MELCOR input model of the divertor components and associated heat transfer system has been developed in order to analyse the divertor ex-vessel LOCA that potentially could result in radioactive releases to the environment. This paper presents the results of some parameter studies related to the DV ex-vessel LOCA: (i) three different in-vessel break sizes: one toroidal ring break with a size of 0.32 m2, one-half ring break of 0.16 m2 and one-quarter ring break of 0.08 m2. (ii) Two different ex-vessel break locations were used: before heat exchanger and after heat exchanger but before pump.