TRADE - Shielding Calculations in the Reactor Building (Document: TRADE PH.3 TR 002 0)

The TRADE 'TRiga Accelerator Driven Experiment', to be performed at the existing TRIGA reactor at ENEA Casaccia, has been proposed as a validation of the Accelerator-Driven-System (ADS) concept. TRADE will be the first experiment in which the three main components of an ADS - the accelerator, spallation target and sub-critical blanket - afe coupled at a power level sufficient to encounter reactivity feedback effects. As such, TRADE represents the necessary intermediate step in the development of hybrid transmutation systems, its expected outcomes being considered crucial - in terms of proof of stability of operation, dynamic behaviour and licensing issues - far the subsequent realization of an ADS Transmutation Demonstrator. An essential role in the feasibility study of the experiment is played by radioprotection calculations. Such a system exhibits new characteristics with respect to a traditional reactor, due to the presence of the proton accelerator. As beam losses always occur under normal operating conditions of an accelerator, shielding studies need to be performed not only around the reactor but also along the beam line from the accelerator to the spallation target. This work illustrates a preliminary evaluation, using Monte Carlo, of the additional shielding to be located around the reactor structures, the beam transport line and the existing reactor building to allow access inside the reactor hall and to restrict the doses outside to their legal limits.