Uncertainty quantification of total delayed neutron yields and time-dependent delayed neutron emission rates in frame of summation calculations

Chiba, Go; Narabayashi, Tadashi

doi:10.1016/j.anucene.2015.07.001

Cited by 4 publications

(1 citation statement)

References 11 publications

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“…b-delayed neutrons emission is quite important in nuclear reactors kinetics. We have quantified nuclear data-induced uncertainty of b-delayed neutron emission rates in the frame of summation calculations [10]. In addition, since nuclear data relevant to the b-delayed neutrons emission are also important in decay heat calculations, we have examined correlation between nuclear data-induced uncertainty of decay heat and that of b-delayed neutrons emission [11].…”

Section: On Correlation Between Decay Heat and B-delayed Neutrons Emimentioning

confidence: 99%

Uncertainty quantification works relevant to fission yields and decay data

Chiba

Nihira

2018

EPJ Nuclear Sci. Technol.

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In the present paper, firstly, we review our previous works on uncertainty quantification (UQ) of reactor physics parameters. This consists of (1) development of numerical tools based on the depletion perturbation theory (DPT), (2) linearity of reactor physics parameters to nuclear data, (3) UQ of decay heat and its reduction, and (4) correlation between decay heat and b-delayed neutrons emission. Secondly, we show results of extensive calculations about UQ on decay heat with several different numerical conditions by the DPTbased capability of a reactor physics code system CBZ.*

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Section: On Correlation Between Decay Heat and B-delayed Neutrons Emimentioning

confidence: 99%

Uncertainty quantification works relevant to fission yields and decay data

Chiba

Nihira

2018

EPJ Nuclear Sci. Technol.

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Consistent adjustment of radioactive decay and fission yields data with measurement data of decay heat andβ-delayed neutron activities

Chiba

2017

Annals of Nuclear Energy

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Decay heat and delayed neutron yields, which are important physical quantities in the field of the nuclear engineering, are dependent on common nuclear data such as radioactive decay data and fission yields data of fission product nuclides. In the present study, correlations between uncertainties of these two quantities are investigated. Nuclear data relevant to uranium-235 and plutonium-239 fissions with thermal neutron are adjusted consistently with a procedure based on Bayes' theorem using the measurement data of decay heat and delayed neutron activities. Numerical results suggest that the correlation between decay heat and delayed neutron activities uncertainties is not significant, and that independent treatments of decay heat or delayed neutron activities are possible. The effect of the consistent treatment of decay heat and delayed neutron activities is, however, observed in the adjustment results in some nuclear data such as uranium-235 thermal fission yields of yttrium-100m and zirconium-100.

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