Void reactivity feedback in BWRs with MA bearing MOX fuels
2011 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 38, no 9, 1968-1977 p.Article in journal (Refereed) Published
In this study, we analyzed a response of a boiling water reactor (BWR) core with homogeneous U-Pu-MA fuel to a change of an in-core void percentage. We employed a 3D, full core BWR model for the stochastic code MCNPX together with the continuous energy cross-section library ENDF B-VII.0. The results show that the main positive contribution to the void effect in the fuels with Pu-MA content around 11-15% consist of the decreased thermal capture in Pu-240, Pu-239 and Am-241 and increased fast and resonance fission of U-238, Pu-239 and Pu-240. We also present a core configuration with as much as 3.45% MA of heavy metal content that still provides a negative total void worth and also a global negative void coefficient in the vicinity the operational void profile. The corresponding Pu/MA fraction indicates that a BWR may be used for MA burning without entering into a positive void feedback regime. Eventually, we show why a 3D model is necessary for a correct assessment of the void behavior.
Place, publisher, year, edition, pages
2011. Vol. 38, no 9, 1968-1977 p.
Void reactivity coefficient, Total void worth, Boiling water reactor, BWR, Minor actinides recycling, Transmutation
IdentifiersURN: urn:nbn:se:kth:diva-37538DOI: 10.1016/j.anucene.2011.04.023ISI: 000293307200019ScopusID: 2-s2.0-79960271332OAI: oai:DiVA.org:kth-37538DiVA: diva2:434867
QC 201108162011-08-162011-08-152012-10-04Bibliographically approved