Title: Reactivity impact of 2H and 16O elastic scattering nuclear data on critical systems with heavy water
Authors: ROUBTSOV D.KOZIER K.CHOW J. C.PLOMPEN ArjanKOPECKY StefanSVENNE J. P.CANTON L.
Citation: NUCLEAR DATA SHEETS vol. 118 p. 414-417
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Year: 2014
JRC N°: JRC87293
ISSN: 0090-3752
URI: http://www.sciencedirect.com/science/article/pii/S0090375214001240
http://dx.doi.org/10.1016/j.nds.2014.04.094
http://publications.jrc.ec.europa.eu/repository/handle/JRC87293
DOI: 10.1016/j.nds.2014.04.094
Type: Articles in periodicals and books
Abstract: The accuracy of deuterium nuclear data is important for reactor physics simulations of heavy water (D2O) reactors. The elastic neutron scattering cross section data at thermal energies, σs, th, have been observed to have noticeable impact on the reactivity values in simulations of critical systems involving D2O. We discuss how the uncertainties in the thermal scattering cross sections of 2H(n,n)2H and 16O(n,n)16O propagate to the uncertainty of the calculated neutron multiplication factor, keff , in thermal critical assemblies with heavy water neutron moderator/reflector. The method of trial evaluated nuclear data files, in which specific cross sections are individually perturbed, is used to calculate the sensitivity coefficients of keff to the microscopic nuclear data, such as σs(E) characterized by σs, th. Large reactivity differences of up to appr. 5–10 mk (500–1000 pcm) were observed using 2H and 16O data files with different elastic scattering data in MCNP5 simulations of the LANL HEU heavy-water solution thermal critical experiments included in the ICSBEP handbook.
JRC Directorate:Health, Consumers and Reference Materials

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