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.
|Pages (from-to)||332 - 341|
|Number of pages||10|
|Journal||Nuclear Science and Engineering|
|Publication status||Published - Aug 1993|
All Science Journal Classification (ASJC) codes
- Nuclear Energy and Engineering