Impact of intermediate and high energy nuclear data on the neutronic safety parameters of MYRRHA accelerator driven system

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Abstract

Perturbation of external neutron source can cause significant local power changes transformed into undesired safety-related events in an accelerator driven system. Therefore for the accurate design of MYRRHA sub-critical core it is important to evaluate the uncertainty of power responses caused by the uncertainties in nuclear reaction models describing the particle transport from primary proton energy down to the evaluated nuclear data table range. The calculations with a set of models resulted in quite low uncertainty on the local power caused by significant perturbation of primary neutron yield from proton interactions with lead and bismuth isotopes. The considered accidental event of prescribed proton beam shape loss causes drastic increase in local power but does not practically change the total core thermal power making this effect difficult to detect. In the same time the results demonstrate a correlation between perturbed local power responses in normal operation and misaligned beam conditions indicating that generation of covariance data for proton and neutron induced neutron multiplicities for lead and bismuth isotopes is needed to obtain reliable uncertainties for local power responses.

Details

Original languageEnglish
Title of host publicationEPJ Web of Conferences
Subtitle of host publicationND 2016: International Conference on Nuclear Data for Science and Technology
Pages1-6
Number of pages6
Volume146
Edition2017
DOIs
Publication statusPublished - 18 Sep 2017
Event2016 - ND: International Conference on Nuclear Data for Science and Technology - Concert gebouw en Oud Sint Jan Hospitaal, Bruges, Belgium
Duration: 11 Sep 201616 Sep 2016
http://www.nd2016.eu/

Publication series

NameEPJ Web of Conferences
PublisherEDP Sciences
ISSN (Print)2100-014X

Conference

Conference2016 - ND
Abbreviated titleND2016
CountryBelgium
CityBruges
Period2016-09-112016-09-16
Internet address

Keywords

  • high-energy range, uncertainty, spallation, beam misalignment

ASJC Scopus subject areas

ID: 6776212