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Pre-design of an AmBB pin loaded with 10% of americium

Abstract : Minor Actinide Bearing Blanket (MABB) fuels, where minor actinides are diluted with UO$_2$ into the radial breeder blankets of Sodium-cooled Fast Reactors (SFR), are an option of interest for the transmutation of minor actinides in this type of reactors. However, their operation under very specific conditions raises many questions, such as the impact of the high helium production during irradiation, which, combined with relatively low temperature could enhance the fuel gaseous swelling and fuel-cladding mechanical interaction. This type of behaviour would require specific design changes in order to meet the design criteria.This paper describes the preliminary thermo-mechanical design of an Americium Bearing Blanket (AmBB) pin and thermal-hydraulic features of an AmBB sub-assembly with the following conditions 10% Am in UO2 matrix, pin and fuel sub-assembly geometry of the typical ASTRID outer-core, and irradiation duration of 1940 EFPD. The behaviour of the pin is calculated with GERMINAL fuel performance code, which has been upgraded according to the specificity of AmBB fuel, with, in particular, a specific model to take into account the swelling due to gas retention. The calculation results show that thermal and mechanical margins are high, from both the design criteria (creep usage fraction and swelling of the cladding) and the thermal-hydraulic criteria (flow rate and pressure loss). Uncertainties taken into consideration do not affect this conclusion.
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Submitted on : Wednesday, December 4, 2019 - 11:01:42 AM
Last modification on : Tuesday, April 28, 2020 - 11:28:14 AM
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B. Valentin, M. Lainet, Michel Pelletier, Nathalie Chauvin, A. Gallais-During. Pre-design of an AmBB pin loaded with 10% of americium. IEMPT Fifteenth NEA Information Exchange Meeting on Actinide and Fission Product Partitioning and Transmutation, Sep 2018, Manchester, United Kingdom. ⟨cea-02338747⟩

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