OSIRIS REACTOR - Centre de Cadarache - CEA

MORE ABOUT IRRADIATIONNUCLEAR ENERGY AUTHORITY ••• CEA35Digital simulation is used in several ways in the preparation and production ofirradiations. As of the design phase, business engineers use modelling in orderto dimension the sample-holder that will house the test specimens to beirradiated.The codes used are for example: Neutronics: ANUBIS system, Double-phase water-steam thermohydraulics: FLICA4 and CATHARE, Thermomechanics and fluid mechanics: CAST3M.These calculations are used to design the device in order to respect thecustomer’s requests with the highest degree of accuracy, in particular thetemperature of the samples and the duration of irradiation.Temperature distribution in the sheathof four UO 2 fuel rods loaded inthe ISABELLE 4 loop.ANUBISThe CEA is currently designinga new generation of the neutroncalculation procedure (ANUBIS).It is based on the APOLLO2(deterministic lattice code), CRONOS2(deterministic code core) andTRIPOLI4 (Monte Carlo code) codes,all three of which have been developedat the CEA. ANUBIS implements thelatest functionalitiesof these codes, which are alreadyused by our industrial partners.APOLLO2 is used by EDF andFramatome ANP in their respectiveneutron calculation chains(the SCIENCE chain of FramatomeANP is certified by NRC). “Standard”core calculations are 3-D diffusioncalculations for 6 groups of energy.ANUBIS is also used to carryout calculations of the completecore of OSIRIS with its irradiationload, using the characteristicsmethod. Reference calculationscan also be carried out in 3-DMonte Carlo using the TRIPOLI 4code (see the illustration below).Distribution of fission ratesper plate: calculation of EXPbenchmark (TRIPOLI4).Temperature mappingin a creep test specimenin a CHOUCA device.Output set:Pg + 86-81-11-94-89 W/cmContour:Temperature