[en] Conclusions: • Hope on the versatile role of MHRs in the strategy of Nuclear Power development should be confirmed by comprehensive studies. • It is possible to study different fuel cycles on the basis of a unified core design. • Peculiarities of fuel cycle studies and technology issues should be thoroughly addressed. • Investigations of introduction of MA in the loaded MHR fuel could be started as a neutron physics exercise (including nuclide flows). • Workscope definition and approach for HTGR Deep Burnup studies should be consistently elaborated taking into account national nuclear policy. • Examples of conceptual developments are very useful for scientific discussions and elaboration of recommendations