Influence of Multigroup Presentation of Neutron Data on VVER-1000 Fluence Calculation
Abstract
The main inconsistency between the results based on the multigroup approximation and those based on continuous energy representation of neutron cross sections is obtained for the VVER-1000 downcomer. The attenuation of the neutron flux through the downcomer calculated with continuous energy representation is about 10% less than the one calculated with multigroup representation. The application of Legendre expansions with higher order up to P7S16 has improved the agreement but not very effectively. The good consistency of results for the attenuation through the VVER-1000 RPV shows that the application of multigroup neutron cross sections representation for iron does not make notable impact on the neutron flux attenuation results in comparison with those obtained by continuous representation.
- Publication:
-
Reactor Dosimetry in the 21st Century
- Pub Date:
- June 2003
- DOI:
- 10.1142/9789812705563_0059
- Bibcode:
- 2003rdtc.conf..477B