Abstract
In this paper, the impact of the thermal scattering data for H in H20 is estimated on criticality benchmarks, based on the variations of the CAB model parameters. The Total Monte Carlo method for uncertainty propagation is applied for 63 keff criticality cases, sensitive to H in H20. It is found that their impact is of a few tenth of pcm, up to 300 pcm maximum, and showing highly non-linear distributions. In a second step, an adjustment is proposed for these thermal scattering data, leading to a better agreement between calculated and experimental keff values, following an increase of scattering contribution. This work falls into the global approach of combining advanced theoretical modelling of nuclear data, followed by possible adjustment in order to improve the performances of a nuclear data library.
Highlights
The impact of the thermal scattering data for H in H20 is estimated on criticality benchmarks, based on the variations of the CAB model parameters
The evaluation of neutron-induced nuclear data, e.g. cross sections, fission yields, spectra, is a continuous process, mainly because the nuclear reaction theory is still improving, new measurements are frequently available, and because there is a need from the user community
The impact of the H in H2O thermal scattering data are here assessed on criticality-safety benchmarks
Summary
The evaluation of neutron-induced nuclear data, e.g. cross sections, fission yields, spectra, is a continuous process, mainly because the nuclear reaction theory is still improving, new measurements are frequently available, and because there is a need from the user community. The need from users might concern better estimations of current reactor quantities (boron letdown curves, power maps) [5,6,7], spent fuel quantities (decay heat, source terms) [8,9,10,11,12], or quantities for advanced systems [13,14,15]. [19,20,21] and references within) In this context, the impact of the nuclear data uncertainties needs to be evaluated in a regular time manner, with respect to the release of new nuclear data libraries and their associated covariance information
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