OSIRIS REACTOR - Centre de Cadarache - CEA

16IRRADIATION POSITIONS AND EXPERIMENTAL CONDITIONSCEA••• NUCLEAR ENERGY AUTHORITYIRRADIATION POSITIONSAND EXPERIMENTAL CONDITIONSThe core of the reactor can house up to 16 experimentaldevices in 4 positions where the fast neutron flux (E > 1 MeV)ranges from 1 to 2. 10 18 n.m -2 s -1 . Structures are alsoprovided outside the core, on 3 faces of the vessel,making it possible to install up to 27 experimentaldevices on the first periphery, where the maximum fastneutron flux is 10 times weaker than in the core, andmany others on the second and third peripheries.Core position geometryEach of the four experimental positions in the corecontains a water box 8.27 cm square. These waterboxes can house and maintain the experimental devicesin the core. Several types of water box are availableas shown in the diagram below. This means varioussizes of devices can be housed.Various geometric configurations can be chosen: 4 holes with a diameter of 37 mm 2 holes with a diameter of 44.5 mm and2 holes with a diameter of 28 mm 1 hole with a diameter of 44.5 mm and2 holes with a diameter of 37 mm 1 hole with a diameter of 76.6 mm.The diameters of the devices are slightly smaller tomaintain a water gap.A1211109B C DBaritonBoîte à eauÉcran Écran ÉcranNORTHTanoxos 1OBEIrma 5ÉcranOBEIrma 4NN80MM70 5 6LL60K Griffonos 1PiedK50 3 4JREAIsabelle 1 JProd.40HREA OBE HProd. VercorsDIODONS 30 1 2GG20Quad03FF10Molfi MolfiREA01 03EEProd.D 4 3 2 1 1 2 3 4 5 6 7 1 2 3 4 D82.7The figure below schematically represents the core of thereactor in its vessel (shown in blue) the control rods in red,and the experimental positions of the core (in green).82.7E F GH J K L M N O P1211109Neutron fluxBasic information about the neutron flux throughoutthe core is provided by the neutron calculationsrequired for its operation and management. In orderto qualify and supplement these calculations,measurements are made in the considered positionusing techniques suited to the type of flux measured(fast flux and heat flux).Several typesof water boxesare available.