Siting Evaluations for the Ignitor Experimental Reactor

Ignitor is a proposed compact high-magnetic field tokamak aimed at studying plasma burning conditions in Deuterium-Tritium plasmas. Localisation of this experimental reactor in Italy has seen growing attention during the last years. The determination to carry out this project in Italy has driven to taking into account several candidate sites. Recently, due to several technical reasons, it was identified a new site, the ENEL – TERNA plant in Rondissone (TO). The main positive characteristics of the ENEL – TERNA site are described. The non-site dependent accidental analysis of the machine has been recently completely re-evaluated. For instance, a new design of the machine Tritium Handling System (TRT) has brought to a reduction of the tritium inventory in Ignitor from about 6 g to about 3 g. As a consequence, many of the environmental source terms considered in previous accidental analyses have been reduced. Accidental sequences defined as DBA (Design Basis Accidents) bring to a maximum dose for the Most Exposed Individual (MEI) of the public of about 1 mSv. Also Beyond DBA (BDBA) accidents have been considered, bringing to maximum doses for MEI of about 3 mSv. All the above results show that the Ignitor machine can be effectively located in the ENEL-TERNA site, satisfying all the requirements from the environmental and safety viewpoint.