The CIELO collaboration: Progress in international evaluations of neutron reactions on Oxygen, Iron, Uranium and Plutonium

¹ Los Alamos National Laboratory, Los Alamos, NM87545, USA
² NAPC–Nuclear Data Section, International Atomic Energy Agency, Vienna, Austria
³ Brookhaven National Laboratory, Brookhaven, USA
⁴ Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
⁵ Institut de Radioprotection et de Sureté Nucleaire, Paris, France
⁶ European Commission, Joint Research Center, Retieseweg 111, 2440 Geel, Belgium
⁷ Nuclear Energy Agency, OECD, Paris
⁸ Rensselaer Polytechnic Institute, Troy, NY, USA
⁹ China Nuclear Data Center, PO Box 275-41, Beijing 102413, P.R. China
¹⁰ China Institute of Atomic Energy, PO Box 275-41, Beijing 102413, P.R. China
¹¹ Nuclear Physics Department, Bucharest University, Bucharest-Magurele, Romania
¹² CEA, DAM Ile de France, 91297 Arpajon, France
¹³ CEA, Nuclear Energy Division, Cadarache, Saint-Paul-lez-Durance, France
¹⁴ Institute of Physics and Power Engineering, Obninsk, Russia
¹⁵ Japan Atomic Energy Agency, Tokai-mura, Japan
¹⁶ Knolls Atomic Power Laboratory, Schenectady, NY, USA
¹⁷ Idaho National Laboratory, Idaho Falls, ID, USA
¹⁸ Jozef Stefan Institute, Ljubljana, Slovenia
¹⁹ Department of Nuclear Engineering, Michigan University, Michigan, USA
²⁰ Chalk River Laboratories, AECL, Chalk River, Ontario, Canada
²¹ Lawrence Livermore National Laboratory, Livermore, CA, USA
²² Korean Atomic Energy Research Institute, Daejeon, South Korea
²³ National Institute of Standards and Technology, Gaithersburg, MD, USA
²⁴ Karlsruhe Institute of Technology, Karlsruhe, Germany
²⁵ Institute for Nuclear Research and Nuclear Energy, Sofia 1784, Bulgaria

^a e-mail: mbchadwick@lanl.gov

Published online: 13 September 2017

Abstract

The CIELO collaboration has studied neutron cross sections on nuclides that significantly impact criticality in nuclear technologies – ¹⁶O, ⁵⁶Fe, ^235,8U and ²³⁹Pu – with the aim of improving the accuracy of the data and resolving previous discrepancies in our understanding. This multi-laboratory pilot project, coordinated via the OECD/NEA Working Party on Evaluation Cooperation (WPEC) Subgroup 40 with support also from the IAEA, has motivated experimental and theoretical work and led to suites of new evaluated libraries that accurately reflect measured data and also perform well in integral simulations of criticality.