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Interrelation of the Iodine-Activity Limit in RBMK Coolant and the Number of Defective Fuel Pins

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A quantitative assessment of the 131I activity in RBMK coolant as a function of the number of defective fuel pins and the distribution over a fuel run is presented. The 131I yield fraction is determined using a model based on the solution of the diffusion equation with empirical coefficients. This investigation was performed for a core-average FA whose power is a function of the burnup. It is shown that in order to prevent the number of defective fuel pins from exceeding a limit it is not enough to take into account their uniform distribution over a run because the burnup strongly impacts the activity and egress of 131I to beneath the fuel-pin cladding and into the coolant.

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Authors and Affiliations

  1. National Research Center Kurchatov Institute, Moscow, Russia

    A. V. Krayushkin & A. K. Smirnova

Authors
  1. A. V. Krayushkin
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  2. A. K. Smirnova
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Correspondence to A. K. Smirnova.

Additional information

Translated from Atomnaya Énergiya, Vol. 128, No. 3, pp. 173–175, March, 2020.

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Krayushkin, A.V., Smirnova, A.K. Interrelation of the Iodine-Activity Limit in RBMK Coolant and the Number of Defective Fuel Pins. At Energy 128, 188–190 (2020). https://doi.org/10.1007/s10512-020-00673-9

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  • DOI: https://doi.org/10.1007/s10512-020-00673-9

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