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Uncertainty quantification of neutron multiplication factors of light water reactor fuels during depletion

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Title: Uncertainty quantification of neutron multiplication factors of light water reactor fuels during depletion
Authors: Chiba, Go Browse this author →KAKEN DB
Okumura, Shintaro Browse this author
Keywords: Nuclear fuel depletion
depletion perturbation theory
uncertainty quantification
Issue Date: 29-May-2018
Publisher: Taylor & Francis
Journal Title: Journal of nuclear science and technology
Volume: 55
Issue: 9
Start Page: 1043
End Page: 1053
Publisher DOI: 10.1080/00223131.2018.1467803
Abstract: Nuclear data-induced uncertainties of infinite neutron multiplication factors (k) during fuel depletion are quantified in a single cell and a 3x3 multi-cell including burnable absorbers. Uncertainties of reaction cross sections, fission yields, decay half-lives and decay branching ratios provided in the JENDL libraries are taken into account. Hundred percent uncertainties are assumed to nuclear data to which uncertainty information are not provided in JENDL. Uncertainties propagation calculations are carried out with the adjoint-based procedure, and required sensitivity profiles of k with respect to these nuclear data are efficiently calculated by the depletion perturbation theory. Covariance matrices for fission yields and decay data in a simplified burnup chain are successfully generated by the stochastic-based procedure. k uncertainties of about 0.6% during fuel depletion are obtained, and it is shown that actinoids reaction cross sections are dominant contributors. Nuclide-wise decomposition of the uncertainties and observation of component-wise sensitivity profiles provide physical interpretations. By virtue of the adjoint-based procedure, several parametric surveys are also conducted. Contributions of uncertainties in fission products (FPs) nuclides are quantified, and important nuclides and energy ranges are identified for further evaluation of nuclear data of FP nuclides. Effect of cooling period on k uncertainties is also discussed.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Nuclear Science and Technology on 29 May 2018, available online:
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 千葉 豪

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