ORILL Code is a 1D transmutation, fuel depletion (burn-up) and radiological protection code useful for nuclear research reactors design and operational safety. ORILL has been cooked at the Nuclear Safety Unit of the Institut Laue-Langevin (ILL), Grenoble, France.

Actually, there is a need for such a pocket tool, which is not addressed by available heavy codes (FISPACT, CINDER, SERPENT, ORIGEN, VESTA, MURE).

The name “ORILL” comes from “ILL” and the prefix “OR” is a tribute to the excellent ORIP_XXI freeware from E.G.Romanov, V.A.Tarasov, F.Z.Vahetov, Research Institute of Atomic Reactors, Dimitrovgrad, Russia.