OSIRIS REACTOR - Centre de Cadarache - CEA

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20EXPERIMENTAL DEVICESCEA••• NUCLEAR ENERGY AUTHORITYThe developmentof the new reactor typesApart from the broad objectives towhich the new families of reactorswill reply, and in particular thoseretained for the Generation IV program,the principal issues at stake relateequally as well to the operation of thecore and the fuels as to the behaviourof the structural materials used.R&D requirements therefore involvestudies on the behaviour of fuels andtheir technological limits, as well asthe qualification of structural materialsin the conditions required by thesenew types of reactors.The irradiation programs associatedwith these needs must be designedso that they enable access tothe important parameters and arerepresentative of both the phenomenaand the conditions encounteredin power reactors.Loading a sample-holder.Irradiation devices can be classified into 3 categories: Capsules designed to irradiate materials under conditions similarto those of water reactors. In these devices (CHOUCA and IRMA)the coolant is static. These capsules exist in various types:• Passive capsules in which only the temperature is controlledand measurements of the neutron flux and the temperature aremade. These capsules are used for the accumulation of fluenceon materials.• Capsules in which, in addition to the capacities of the precedingfamily, the samples are subjected to stress or strain underirradiation.• metrology capsules, which are used to measure the dimensionalchanges of the samples in situ. The PHAETON capsules designed to irradiate materials and fuels underconditions similar to those in high temperature reactors for the newfamilies of reactor. Loops reproducing the thermohydraulic, neutronic and chemicalconditions encountered in power reactors (loops GRIFFONOS andISABELLE).In addition to these 3 families of devices, there are three other morespecific devices (TANOXOS, IRIS and BARITON).CHOUCAThe CHOUCA system is a device dedicated to the irradiation of materialsin the core or on the periphery of the reactor. This device, when placedin the core of the reactor, cannot be introduced or withdrawn whenthe reactor is in operation.It consists of 2 concentric tubes delimiting a gas gap, which is used: to adjust the temperature inside the internal tube depending onthe position and the sample load by modifying the nature of the gasit contains, to control the leak from either one of the tubes ensuring the containmentof the samples.Electric heating elements are placed on the internal tube, quenchedby a spray of metal particles gauged by further finishing. This heatingmethod ensures fine control of the temperature of the samplesthroughout the irradiation by responding instantaneously to variationsin heating from the reactor.Sample-holders are inserted inside the capsule to house the samplesspecific to each type of experiment, such as: irradiation of acquisition of fluence at controlled temperature, irradiation of samples placed under stress, irradiation of samples under stress with dimensional follow-up duringirradiation.
EXPERIMENTAL DEVICESNUCLEAR ENERGY AUTHORITY ••• CEA21The experiments carried out in CHOUCA systemstypically relate to: fuel cladding materials, materials for the internal structures of various typesof reactors, neutron-absorbing materials.Barrels for the GONDOLEsample-holder.The principal characteristics of this device are: Effective diameter: 24 to 30 mm Height under flux: 600 mm Fast neutron flux (E > 1 MeV):up to 2.10 18 n.m -2 .s -1 Acceptable gamma heating:up to 13 W.g -1 Medium: NaK Usual operating temperatures:250 to 400 °C, adjusted to ± 5 °CdetailCHOUCA DeviceEnsemble with connectionsInstrumentation: 12 thermocouples on the CHOUCA and 18 onthe sample-holders, activation foils for dosimetry to access the neutronfluence received by the samples, pressure pick-ups and measurement of the claddiameter for certain specific experiments.CHOUCA device.sample holderIRMAIRMA is a capsule designed for the irradiation, in an inert environment, of structural materials and more particularly, the steelsused in pressurized water reactors.In the field of vessel steels, this device is used for example:An IRMA sample-holder(lower and upper sections). to characterize the effects of temperature and dose, evaluate the toughness of areas thermically affected bywelding operations, study the influence of the neutron spectrum on embrittlement, study the influence of annealing on the ductile/brittle transitiontemperature.Situated on the periphery of the core, this device can be usedfor irradiation or withdrawn without stopping the reactor.Just like the CHOUCA, it comprises a double jacket constitutinga heat shield, heating elements distributed all along the capsuleand a sample-holder suited to the experimental load.
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OSIRIS REACTOR - Centre de Cadarache - CEA

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