Development of a coupling technique between RELAP5 and SIMMER-IV for fusion reactor applications

A critical problem in the Water-Cooled Lead-Lithium Breeding Blanket system (WCLL-BB) is the possible interaction between the water and the Lithium-Lead eutectic alloy - which act respectively as primary coolant and as breeder/neutron multiplier - due to a postulated rupture of the coolant circuit in the Breeding Unit of the BB. This scenario involves a complex multiphase interaction together with an exothermal chemical reaction between the two fluids with the production of hydrogen.