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Lee, Deokjung
Computational Reactor physics & Experiment lab (CORE Lab)
Research Interests
  • Reactor Analysis computer codes development
  • Methodology development of reactor physics
  • Nuclear reactor design(SM-SFR,PWR and MSR)

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The impact of U-238 resonance elastic scattering approximations on thermal reactor Doppler reactivity

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Title
The impact of U-238 resonance elastic scattering approximations on thermal reactor Doppler reactivity
Author
Lee, DeokjungSmith, KordRhodes, Joel
Issue Date
2009-04
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ANNALS OF NUCLEAR ENERGY, v.36, no.3, pp.274 - 280
Abstract
The effects of accurate modeling of neutron scattering in 238U resonances are analyzed for typical light water reactor (LWR) and next generation nuclear plant (NGNP) lattices. An exact scattering kernel is formulated and implemented in a newly developed Monte Carlo code, MCSD (Monte Carlo slowing down), which solves a neutron slowing down in an infinite homogeneous medium and is used to generate resonance integral data used in the CASMO-5 lattice physics code. It is shown that the exact scattering kernel increases LWR Doppler coefficients by ∼10% relative to the traditional assumption of asymptotic elastic downscatter for 238U resonances. These resonance modeling improvements are shown to decrease hot full power eigenvalues by ∼200 pcm for LWRs and ∼450 pcm for NGNPs.
URI
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DOI
10.1016/j.anucene.2008.11.026
ISSN
0306-4549
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