Open Access
ND 2007
Article Number 208
Number of page(s) 6
Section Benchmarking for fission applications
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07723

From integral experiments to nuclear data improvement

A. Santamarina

CEA Cadarache, DEN/DER/SPRC, 13108 Saint-Paul-lez-Durance Cedex, France

Published online: 21 May 2008

Target accuracy on LWR neutronics parameters is 2 to 5 times lower than the a priori uncertainty (1σ) due to nuclear data. This paper summarizes the experimental facilities and the integral measurements that are required for code qualification. The rigorous use of integral information through trend analysis method is described. Trends on JEF2 data from Keff measurements and P.I.Es are presented. These trends were accounted for in the new JEFF3 evaluations. The role of fundamental experiments, such as worth measurement of separated isotopes, is emphasized. Some recent improvements in JEFF3.1 (237Np, 239Pu) are extracted from these specific experiments.

© CEA 2008