Radiation dose assessment due to the accidental release of radionuclides from a DCLL reactor

A conceptual design of a DEMO fusion reactor based on a dual coolant He/Pb 15.7Li breeding blanket (DCLL) is being developed within the Spanish Breeding Blanket Technology Programme: TECNOFUS. The production of tritium from the reactor, mainly due to the (n,t) and (n,n't) reactions with Li-6 and Li-6 atoms respectively, as well as the activation products of LiPb, might be a concern from the radiological safety point of view. In this contribution, an accidental release in atmosphere of tritium and other relevant radionuclides is evaluated considering different release scenarios. The effective dose for the public around the reactor site is calculated for various atmospheric conditions and different reception points using the well-established Gaussian plume model for the numerical description of the movement and dispersion of effluent from a release point.