Impact of heterogeneous Cm-distribution on proton source efficiency in accelerator-driven systems
2004 (English)In: Proceedings of the PHYSOR 2004: The Physics of Fuel Cycles and Advanced Nuclear Systems - Global Developments, 2004, 489-497 p.Conference paper (Refereed)
The proton source efficiency (ψ*) was studied for homogeneous and heterogeneous distributions of minor actinides in a nitride-fuelled and lead-bismuth-cooled accelerator-driven system. The findings from the MCNPX simulations indicate that, compared to a homogeneous configuration, a gain in ψ* by up to 16% can be obtained by distributing the minor actinides heterogeneously, Cm being placed in the inner zone of the active core and Am in the outer zone. The reason for this is the higher fission probability for neutrons for Cm than for Am in the energy range below 1.0 MeV. Moreover, a comparative study of two different physics packages available in MCNPX, the Bertini and the CEM models, has been performed, focusing on the production of neutrons in the spallation target and on the proton source efficiency. The Bertini model was found to produce a higher number of neutrons in the low-energy range (below ∼15 MeV) than the CEM model. Consequently, the Bertini model also over-estimates ψ* by about 10%, compared to the CEM model.
Place, publisher, year, edition, pages
2004. 489-497 p.
ADS, Bertini, CEM, Curium, MCNPX, Proton source efficiency, Spallation, Transmutation, Americium, Bismuth, Cooling, Neutrons, Protons, Particle accelerators
IdentifiersURN: urn:nbn:se:kth:diva-157286ScopusID: 2-s2.0-22344452568ISBN: 0894486837OAI: oai:DiVA.org:kth-157286DiVA: diva2:771225
PHYSOR 2004: The Physics of Fuel Cycles and Advanced Nuclear Systems - Global Developments, 25 April 2004 through 29 April 2004, Chicago, IL, United States
QC 201412122014-12-122014-12-082014-12-12Bibliographically approved