400 MWth gas cooled ADT core neutronic benchmark

In France, the 'December 1991 act' has generated much R and D on nuclear waste management. One of the main conclusions is that fast reactors offer the best performances to transmute minor actinides. Two types of fast spectrum reactors can be used: critical or sub-critical ones (in this case, Accelerator Driven systems, ADS). Within this scope, a Gas-cooled ADT core neutronic benchmark has been proposed by CEA for an IAEA Coordinated Research Project (CRP) on 'Studies of Advanced Reactor Technology Options for Effective Incineration of Radioactive Waste'. This will help clarifying the future issues associated to the improvement of the core designs with more reliable and accurate tools. The benchmark exercise is based on a 400 MWth gas-cooled ADT with fertile-free fuel (Pu, Np, Am, Cm)O{sub 2} within MgO matrix. (authors)