Spectral indices measurements for neutron data validation in the lead - bismuth VENUS-F fast cores for MYRRHA

Research outputpeer-review


In order to support the construction and licensing of the MYRRHA ADS, a number of zero-power experiments have been fulfilled at the VENUS-F reactor in sub-critical and critical cores. The experiments in the sub-critical cores were devoted to on-line sub-criticality measurement methods while core safety aspects and nuclear data validation were investigated in the critical core experiments. The systematic issues with C/E results observed in several VENUS-F critical cores, for spectral indices as well as for reactivity effects (PHYSOR-2016, ND-2016, PHYSOR-2018) initiated the current work. New measurements were performed in different core conditions (i.e. neutron spectrum, surrounding materials) compared to the previous studies. The spectrum indices F49/F25, F37/F25 and F28/F25 were measured with fission chambers in specially prepared assemblies containing only one type of material (fuel rodlets, Al2O3, C, Pb) and also inside in-pile-sections mock-ups containing polyethylene or air. All experimental results are analyzed with the MCNP6.2 code and JEFF-3.3, ENDF/B-VIII and JENDL 4.0 data. The C/E dependence on the neutron spectrum and on the composition of the specific core materials are discussed.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Physics of Reactors, PHYSOR 2022
PublisherAmerican Nuclear Society
Number of pages8
ISBN (Electronic)9780894487873
StatePublished - May 2022
Event2022 - PHYSOR - International Conference on Physics of Reactors: Making Virtual a Reality: Advancements in Reactor Physics to Leap Forward Reactor Operation and Deployment - Sheraton Pittsburgh Hotel, Pittsburgh, PA
Duration: 15 May 202220 May 2022

Publication series

NameProceedings of the International Conference on Physics of Reactors, PHYSOR 2022


Conference2022 - PHYSOR - International Conference on Physics of Reactors
Country/TerritoryUnited States
CityPittsburgh, PA

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Safety, Risk, Reliability and Quality
  • Nuclear and High Energy Physics
  • Radiation

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