The effect of approximations in the energy distributions of scattered neutrons on thermal reactor Doppler effects
- CEA, St-Paul-lez-Durance (France)
In calculations of resonance shielding and Doppler coefficients the effect of thermal motion on the energy distribution of scattered neutrons is neglected. Recent publications by Ouisloumen and Sanchez, and also by Kurchenkov and Laletin, have shown that secondary energy distributions are strongly perturbed by Doppler broadening in resonances. In the presence paper calculations of resonance absorption and Doppler effects are described. These show that in a thermal reactor spectrum the resonance absorption in U-238 is increased by about 1% at reactor operating temperatures and the Doppler effect is increased by about 9%, when the exact secondary energy distribution is used instead of the asymptotic distribution. The effect of a temperature distribution across the fuel pin is also calculated and it is shown that the usual definition of equivalent temperature is valid.
- OSTI ID:
- 62168
- Report Number(s):
- CONF-940507-Vol.2; TRN: 95:002916-0097
- Resource Relation:
- Conference: International conference on nuclear data for science and technology: nuclear data for the twenty-first century, Gatlinburg, TN (United States), 9-13 May 1994; Other Information: PBD: 1994; Related Information: Is Part Of Proceedings of the international conference nuclear data for science and technology. Volume 2; Dickens, J.K. [ed.]; PB: 571 p.
- Country of Publication:
- United States
- Language:
- English
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