Postirradiation characterization of palladium as an additive for fuel cladding chemical interaction mitigation in metallic fuel

•Pd effectiveness to mitigate fuel cladding chemical interaction was investigated.•Pd effect on fuel performance was analyzed in irradiated U-10Zr.•Pd is used to bind lanthanides and impede their migration.•Microstructure and elemental analyses were performed via microscopy.•Pd was observed to form...

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Veröffentlicht in:Journal of nuclear materials 2022-01, Vol.558, p.153403, Article 153403
Hauptverfasser: Di Lemma, Fidelma G., Trowbridge, Tammy M., Capriotti, Luca, Harp, Jason M., Benson, Michael T., Mariani, Robert D.
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container_start_page 153403
container_title Journal of nuclear materials
container_volume 558
creator Di Lemma, Fidelma G.
Trowbridge, Tammy M.
Capriotti, Luca
Harp, Jason M.
Benson, Michael T.
Mariani, Robert D.
description •Pd effectiveness to mitigate fuel cladding chemical interaction was investigated.•Pd effect on fuel performance was analyzed in irradiated U-10Zr.•Pd is used to bind lanthanides and impede their migration.•Microstructure and elemental analyses were performed via microscopy.•Pd was observed to form intermetallics with Zr and to combine with lanthanides. This work describes the microstructural and elemental characterization of irradiated metallic fuels containing palladium as an additive. The use of additives has been proposed to control Fuel-Cladding Chemical Interaction (FCCI) and thus to promote higher fuel utilization (i.e., higher burnup). In this work, Pd has been investigated as a potential additive to metallic fuel to bind lanthanides, impeding their migration and attack on the cladding. The influence of Pd on the microstructure, chemistry and performance of metallic fuel has been characterized via scanning electron microscopy for two metallic fuel designs—namely, annular and solid fuel. Pd was observed to play an important role in the chemistry of the fuel. Indeed, the addition of Pd leads to the formation of new phases. Pd was detected to combine not only with the lanthanides, as intended, but also with Zr, a main element of the fuel matrix. While Pd proved to be effective in preventing lanthanide migration and their attack on the cladding, the Pd-Zr compound may potentially lead to other unexpected fuel-performance issues, such as the formation of low-melting point phases and increased unalloyed U available for FCCI interaction with Fe in the cladding. Even the increase of Zr to 13wt%. did not completely mitigate this adverse phenomenon generated by the Pd-Zr interaction. Thus, the efficacy of using this additive needs further investigation.
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This work describes the microstructural and elemental characterization of irradiated metallic fuels containing palladium as an additive. The use of additives has been proposed to control Fuel-Cladding Chemical Interaction (FCCI) and thus to promote higher fuel utilization (i.e., higher burnup). In this work, Pd has been investigated as a potential additive to metallic fuel to bind lanthanides, impeding their migration and attack on the cladding. The influence of Pd on the microstructure, chemistry and performance of metallic fuel has been characterized via scanning electron microscopy for two metallic fuel designs—namely, annular and solid fuel. Pd was observed to play an important role in the chemistry of the fuel. Indeed, the addition of Pd leads to the formation of new phases. Pd was detected to combine not only with the lanthanides, as intended, but also with Zr, a main element of the fuel matrix. While Pd proved to be effective in preventing lanthanide migration and their attack on the cladding, the Pd-Zr compound may potentially lead to other unexpected fuel-performance issues, such as the formation of low-melting point phases and increased unalloyed U available for FCCI interaction with Fe in the cladding. Even the increase of Zr to 13wt%. did not completely mitigate this adverse phenomenon generated by the Pd-Zr interaction. 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This work describes the microstructural and elemental characterization of irradiated metallic fuels containing palladium as an additive. The use of additives has been proposed to control Fuel-Cladding Chemical Interaction (FCCI) and thus to promote higher fuel utilization (i.e., higher burnup). In this work, Pd has been investigated as a potential additive to metallic fuel to bind lanthanides, impeding their migration and attack on the cladding. The influence of Pd on the microstructure, chemistry and performance of metallic fuel has been characterized via scanning electron microscopy for two metallic fuel designs—namely, annular and solid fuel. Pd was observed to play an important role in the chemistry of the fuel. Indeed, the addition of Pd leads to the formation of new phases. Pd was detected to combine not only with the lanthanides, as intended, but also with Zr, a main element of the fuel matrix. 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subjects Additives
Advanced fuel design
FCCI
Lanthanides
Melting point
Melting points
Metal fuels
Metallic fuel
Microstructure
Mitigation
Nuclear fuel elements
Palladium
PIE
Scanning electron microscopy
Solid fuels
Zirconium compounds
title Postirradiation characterization of palladium as an additive for fuel cladding chemical interaction mitigation in metallic fuel
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