Nuclear Engineering and Technology

  • 제53권9호
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  • Pages.2816-2829
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Uncertainty analyses of spent nuclear fuel decay heat calculations using SCALE modules

  • Shama, Ahmed (Laboratory of Reactor Physics and Systems Behaviour (LRS), Ecole Polytechnique Federale de Lausanne (EPFL)) ;
  • Rochman, Dimitri (Laboratory for Reactor Physics and Thermal-Hydraulics (LRT), Paul Scherrer Institute (PSI)) ;
  • Pudollek, Susanne (National Cooperative for the Disposal of Radioactive Waste (Nagra)) ;
  • Caruso, Stefano (Kernkraftwerk Gosgen-Daniken AG) ;
  • Pautz, Andreas (Laboratory of Reactor Physics and Systems Behaviour (LRS), Ecole Polytechnique Federale de Lausanne (EPFL))
  • 투고 : 2020.09.20
  • 심사 : 2021.03.11
  • 발행 : 2021.09.25
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초록

Decay heat residuals of spent nuclear fuel (SNF), i.e., the differences between calculations and measurements, were obtained previously for various spent fuel assemblies (SFA) using the Polaris module of the SCALE code system. In this paper, we compare decay heat residuals to their uncertainties, focusing on four PWRs and four BWRs. Uncertainties in nuclear data and model inputs are propagated stochastically through calculations using the SCALE/Sampler super-sequence. Total uncertainties could not explain the residuals of two SFAs measured at GE-Morris. The combined z-scores for all SFAs measured at the Clab facility could explain the resulting deviations. Nuclear-data-related uncertainties contribute more in the high burnup SFAs. Design and operational uncertainties tend to contribute more to the total uncertainties. Assembly burnup is a relevant variable as it correlates significantly with the SNF decay heat. Additionally, burnup uncertainty is a major contributor to decay heat uncertainty, and assumptions relating to these uncertainties are crucial. Propagation of nuclear data and design and operational uncertainties shows that the analyzed assemblies respond similarly with high correlation. The calculated decay heats are highly correlated in the PWRs and BWRs, whereas lower correlations were observed between decay heats of SFAs that differ in their burnups.

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과제정보

This study is part of an ongoing PhD project titled "Uncertainty quantification of spent nuclear fuel nuclide inventory" that is funded by the Swiss National Cooperative for the Disposal of Radioactive Waste (Nagra). This study was also partly funded by the European Union's Horizon 2020 Research and Innovation Programme under Grant Agreement No. 847593.

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