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Appraisal of the NRC H-uptake calculation for Swiss boiling water reactors

•The extrapolation of the NRC BWR H-content model leads to an overprediction for Swiss fuels.•A model for calculation of H-content for Swiss BWR has been developed for burnup up to 90 MWd/kgU.•A LOCA analysis, where the new correlation is used, leads to less conservative results. Uptake of hydrogen...

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Published in:Nuclear engineering and design 2022-05, Vol.391, p.111731, Article 111731
Main Authors: Cozzo, C., Khvostov, G., Clifford, I., Ferroukhi, H.
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cited_by cdi_FETCH-LOGICAL-c392t-14564b6c540e298aa46884ce29a14ef4fd373ab085c5351444b899b4b91a35a93
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container_title Nuclear engineering and design
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creator Cozzo, C.
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description •The extrapolation of the NRC BWR H-content model leads to an overprediction for Swiss fuels.•A model for calculation of H-content for Swiss BWR has been developed for burnup up to 90 MWd/kgU.•A LOCA analysis, where the new correlation is used, leads to less conservative results. Uptake of hydrogen by the cladding of fuel rods during LWR operation worsens the mechanical properties of the material and can lead to cladding failure. The U.S. NRC has introduced a dependency of the equivalent cladding reacted (ECR) criterion on the H-content in the cladding and has proposed a burnup dependent calculation model of the H-content based on a large database which does not cover high burnup such as those reached in Switzerland. This work addresses how the extrapolation of the proposed H-content calculation is conservative compared to the experimental values on claddings irradiated in Swiss plants. Therefore, a model is proposed to calculate the H-content in Swiss BWR fuels up to high burnup, based on published experimental data. The new correlation leads to less conservative results. This is demonstrated with the simulation of a postulated LOCA in a Swiss BWR, where the high exposure bin in the core is no longer expected to fail.
doi_str_mv 10.1016/j.nucengdes.2022.111731
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Uptake of hydrogen by the cladding of fuel rods during LWR operation worsens the mechanical properties of the material and can lead to cladding failure. The U.S. NRC has introduced a dependency of the equivalent cladding reacted (ECR) criterion on the H-content in the cladding and has proposed a burnup dependent calculation model of the H-content based on a large database which does not cover high burnup such as those reached in Switzerland. This work addresses how the extrapolation of the proposed H-content calculation is conservative compared to the experimental values on claddings irradiated in Swiss plants. Therefore, a model is proposed to calculate the H-content in Swiss BWR fuels up to high burnup, based on published experimental data. The new correlation leads to less conservative results. 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source ScienceDirect Journals
subjects Boiling water reactor
Boiling water reactors
Cladding integrity
Claddings
Equivalent cladding reacted
Hydrogen uptake
Mathematical models
Mechanical properties
Nuclear fuel elements
Nuclear fuels
title Appraisal of the NRC H-uptake calculation for Swiss boiling water reactors
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