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        HTR fuel coating separate effect test PYCASSO

        de Groot, S.,Guillermier, P.,Sawa, K.,Escleine, J.M.,Ueta, S.,Basini, V.,Bakker, K.,Lee, Y.W.,Perez, M.,Kim, B.G. North-Holland Pub. Co 2010 Nuclear engineering and design Vol.240 No.10

        The ''analytical'' PYCASSO (PYrocarbon irradiation for Creep and Swelling/Shrinkage of Objects) irradiations focus on determining the effects of neutron irradiation in the temperature range of 900-1100<SUP>o</SUP>C, excluding effects due to the presence of fuel, such as pressurization or chemical attack by fission products. These irradiations can therefore be considered separate effect tests, where only the influence of neutron fluence and temperature on coatings and coating combinations is investigated. For this purpose dedicated particles have been manufactured consisting of surrogate kernels (ZrO<SUB>2</SUB> and Al<SUB>2</SUB>O<SUB>3</SUB>) with different types of PyC/SiC/ZrC coatings and coating combinations. All specimens delivered have been extensively characterized, such that even potentially small changes due to the irradiation in dimensions, microstructure and density can be determined accurately after irradiation. Partners involved in this irradiation are CEA (France), JAEA (Japan) and KAERI (South Korea). The PYCASSO irradiations take place in the High Flux Reactor (HFR) in Petten, and are coordinated by NRG (The Netherlands). The partnership for PYCASSO was initiated by the RAPHAEL (V)HTR European 6th Framework Program and is integrated in the Generation IV International Forum VHTR Fuel and Fuel Cycle project.

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