Fourth-generation nuclear power systems are based on high-temperature gas-cooled reactors, in which the pebble fuel is primary energy carrier. In this regard, applying protective pyrocarbon coatings granulated an essential problem ensuring reliability of plants. The article’s main idea to research rational technological parameters forming a coating granules model. For purpose, Al2O3 with pyroca...

Abstract Multi-recycling HTGR has been investigated by JAEA in order to reduce the environmental burden and non-proliferation of Pu. In previous study, it is found that all actinoids except neptunium, which not problematic from viewpoint toxicity proliferation, can be recycled. However, cycle length slightly decreased compared with uranium fueled core due cumulated fertile TRU fuel composition....

Multi-pass refueling scheme is a highlighted feature of pebble bed HTGR which spatially mixes the burnup calculation inside core. Such relate in one region core to others and thus affects uncertainty propagation nuclear data, e.g. fission product yield. In this work, thermal neutron induced U-235 yield uncertainties are propagated HTR-PM models with various schemes V.S.O.P. code. And effect mul...