Effective beta sensitivity to the incident neutron energy dependence of the absolute delayed neutron yields

A. Angelo, A. Filip

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The uncertainty of the 235U, 239Pu, 238U absolute delayed neutron yields Vd is one of the principal sources of uncertainty in predicting the fission reactor reactivity scale Beff. The current uncertainties in the dependence of vd on incident neutron energy is investigated for significance in the evaluation of Beff. The uncertainty effects on the GODIVA, JEZEBEL, Zero Power Reactor, SNEAK, and Masurca benchmark facility calculations are analyzed using ENDF/B and JEF basic data. Different assumptions about the energy dependence result in variations of up to 5% in the reactor spectrum averaged values of vd, and these would result in variations of up to nearly 2% in the value of Beff for a typical liquid-metal fast breeder reactor.
Original languageEnglish
Pages (from-to)332 - 341
Number of pages10
JournalNuclear Science and Engineering
Issue number4
Publication statusPublished - Aug 1993


All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering

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