Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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On the use of spectral algorithms for the prediction of short-lived volatile fission product release: Methodology for bounding numerical error

  • Zullo, G. (Politecnico di Milano, Department of Energy, Nuclear Engineering Division) ;
  • Pizzocri, D. (Politecnico di Milano, Department of Energy, Nuclear Engineering Division) ;
  • Luzzi, L. (Politecnico di Milano, Department of Energy, Nuclear Engineering Division)
  • Received : 2021.05.07
  • Accepted : 2021.10.19
  • Published : 2022.04.25
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Abstract

Recent developments on spectral diffusion algorithms, i.e., algorithms which exploit the projection of the solution on the eigenfunctions of the Laplacian operator, demonstrated their effective applicability in fast transient conditions. Nevertheless, the numerical error introduced by these algorithms, together with the uncertainties associated with model parameters, may impact the reliability of the predictions on short-lived volatile fission product release from nuclear fuel. In this work, we provide an upper bound on the numerical error introduced by the presented spectral diffusion algorithm, in both constant and time-varying conditions, depending on the number of modes and on the time discretization. The definition of this upper bound allows introducing a methodology to a priori bound the numerical error on short-lived volatile fission product retention.

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References

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