PAREX, a numeric code for plant operation aid

Abstract : The PAREX code has been widely used for process design used for the flowsheet design of the purification cycles of the La Hague plant build for nuclear fuel treatment. This paper focused on the use of the code as an aid for plant operation through two application examples. The first one is related to on site flow sheet available margin evaluation of the extraction zone of a first cycle flow sheet. The second example concern the plutonium stripping operation of a plutonium cycle, where the code has been used to explain the shift of plutonium leak in the solvent outlet observed.