Fixed neutron absorbers for improved nuclear safety and better economics in nuclear fuel storage, transport and disposal

Lovecký, Martin; Závorka, Jiří; Jiřičková, Jana; Ondráček, Z.; Škoda, Radek

doi:10.1016/j.net.2023.03.024

Cited by 2 publications

(1 citation statement)

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“…Because the policy of nuclear power plant reprocessing has always relied on overestimating the reactivity to achieve a sufficiently conservative safety margin for reactor safety, the criticality equipment in the conventional reprocessing plants (such as SNF storage pools and reprocessing dissolvers) are typically calculated assuming the SNF to be fresh fuel for the calculation [14]. While this approach ensures that the criticality equipment in the reprocessing plant meets the criticality safety limit requirement, it also overestimates the reactivity of the SNF and consequently restricts the processing capacities of reprocessing plants for SNF.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis Study of Effects of Nuclide Concentration Uncertainties on Biases and Bias Uncertainties in Criticality Calculation Method

Ni,

Chen,

Xie

et al. 2023

Energies

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To quantify the uncertainties propagating from the fuel depletion calculation to the criticality calculation in the burnup credit system, this paper evaluates the effects of the nuclide concentration uncertainty on the criticality calculation based on Monte Carlo uncertainty sampling methods, and analyzes the assumption that the measured-to-calculated nuclide concentration ratio obeys a normal distribution with uncorrelation among isotopes in the Monte Carlo uncertainty sampling method by using the sensitivity and uncertainty analysis method and the Latin hypercube sampling method. The results indicated that the Monte Carlo uncertainty sampling method could effectively quantify the uncertainties with a calculation accuracy within 3%, and the criticality uncertainty calculation for the assumption that the measured-to-calculated concentration ratios obey normal distributions was more conservative than that of the samples according to their actual distributions. Thus, the assumption of a normal distribution is reasonable in the sampling process. Moreover, the uncertainty results of the criticality calculation considering the correlations among important isotopes presented a decrease of approximately 5% over those without the isotopic correlations. Therefore, introducing the correlations of significant isotopes could reduce the uncertainty of the criticality calculation for spent-nuclear-fuel storage systems.

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Section: Introductionmentioning

confidence: 99%