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|Title:||Post Irradiation Examination of Irradiated Americium Oxide and Uranium Dioxide in Magnesium Aluminate Spinel|
|Authors:||KLAASSEN F.c.; BAKKER K.; SCHRAM R.p.c.; KLEIN MEULEKAMP R.; CONRAD R.; SOMERS Joseph; KONINGS Rudy|
|Citation:||JOURNAL OF NUCLEAR MATERIALS vol. 319 p. 108-117|
|Publisher:||ELSEVIER SCIENCE BV|
|Type:||Articles in periodicals and books|
|Abstract:||To study MgAl2O4 spinel as inert matrix material for the transmutation of minor actinides, two capsules were irradiated at the high flux reactor in Petten, containing 12.5 wt% micro-dispersed 241AmOx in spinel and 25 wt% micro-dispersed enriched UO2 in spinel. During irradiation, the initially present 241Am was converted for 99.8% to fission products (50%), plutonium (30%), curium (16%) and 243Am (4%). The UO2 spinel target experienced a burn-up of 32% fission per initial metal atom. The post irradiation examination of the AmOx inert matrix target showed swelling of 27 vol.%, and a gas release of 48% for He and 16% for Xe and Kr. The UO2 inert matrix target also showed a large volumetric swelling of 11%, directed mainly radially. Ceramography on the UO2 inert matrix target revealed a complete restructuring of the spinel grains upon irradiation and the absence of porosity, suggesting that amorphisation is the main cause of the swelling.|
|JRC Directorate:||Nuclear Safety and Security|
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