TY - GEN
T1 - Use of integral experiments for the assessment of a new 235U IRSN-CEA evaluation
AU - Ichou, Raphaëlle
AU - Leclaire, Nicolas
AU - Leal, Luiz
AU - Haeck, Wim
AU - Morillon, Benjamin
AU - Romain, Pascal
AU - Duarte, Helder
N1 - Publisher Copyright:
© The Authors, published by EDP Sciences, 2017.
PY - 2017/9/13
Y1 - 2017/9/13
N2 - The Working Party on International Nuclear Data Evaluation Co-operation (WPEC) subgroup 29 (SG 29) was established to investigate an issue with the 235U capture cross-section in the energy range from 0.1 to 2.25 keV, due to a possible overestimation of 10% or more. To improve the 235U capture crosssection, a new 235U evaluation has been proposed by the Institut de Radioprotection et de Sûreté Nucléaire (IRSN) and the CEA, mainly based on new time-of-flight 235U capture cross-section measurements and recent fission cross-section measurements performed at the n-TOF facility from CERN. IRSN and CEA Cadarache were in charge of the thermal to 2.25 keV energy range, whereas the CEA DIF was responsible of the high energy region. Integral experiments showing a strong 235U sensitivity are used to assess the new evaluation, using Monte-Carlo methods. The keff calculations were performed with the 5.D.1 beta version of the MORET 5 code, using the JEFF-3.2 library and the new 235U evaluation, as well as the JEFF-3.3T1 library in which the new 235U has been included. The benchmark selection allowed highlighting a significant improvement on keff due to the new 235U evaluation. The results of this data testing are presented here.
AB - The Working Party on International Nuclear Data Evaluation Co-operation (WPEC) subgroup 29 (SG 29) was established to investigate an issue with the 235U capture cross-section in the energy range from 0.1 to 2.25 keV, due to a possible overestimation of 10% or more. To improve the 235U capture crosssection, a new 235U evaluation has been proposed by the Institut de Radioprotection et de Sûreté Nucléaire (IRSN) and the CEA, mainly based on new time-of-flight 235U capture cross-section measurements and recent fission cross-section measurements performed at the n-TOF facility from CERN. IRSN and CEA Cadarache were in charge of the thermal to 2.25 keV energy range, whereas the CEA DIF was responsible of the high energy region. Integral experiments showing a strong 235U sensitivity are used to assess the new evaluation, using Monte-Carlo methods. The keff calculations were performed with the 5.D.1 beta version of the MORET 5 code, using the JEFF-3.2 library and the new 235U evaluation, as well as the JEFF-3.3T1 library in which the new 235U has been included. The benchmark selection allowed highlighting a significant improvement on keff due to the new 235U evaluation. The results of this data testing are presented here.
UR - https://www.scopus.com/pages/publications/85030464944
U2 - 10.1051/epjconf/201714602046
DO - 10.1051/epjconf/201714602046
M3 - Conference contribution
AN - SCOPUS:85030464944
T3 - EPJ Web of Conferences
BT - ND 2016
A2 - Siegler, Peter
A2 - Mondelaers, Wim
A2 - Plompen, Arjan
A2 - Hambsch, Franz-Josef
A2 - Schillebeeckx, Peter
A2 - Kopecky, Stefan
A2 - Heyse, Jan
A2 - Oberstedt, Stephan
PB - EDP Sciences
T2 - 2016 International Conference on Nuclear Data for Science and Technology, ND 2016
Y2 - 11 September 2016 through 16 September 2016
ER -