Methods and Issues for the Combined Use of Integral Experiments and Covariance Data Salvatores, M. [CEA, Nuclear Energy Division, Cadarache, Saint-Paul-lez-Durance (France)]; Idaho National Laboratory (INL), Idaho Falls, ID (United States)]; Palmiotti, G. [Idaho National Laboratory (INL), Idaho Falls, ID (United States)]; Aliberti, G.; McKnight, R. [Argonne National Laboratory (ANL), Argonne, IL (United States)]; Archier, P.; De Saint Jean, C. [CEA, Nuclear Energy Division, Cadarache, Saint-Paul-lez-Durance (France)]; Dupont, E. [OECD, Nuclear Energy Agency (NEA), Issy-les-Moulineaux (France)]; Herman, M. [Brookhaven National Laboratory (BNL), Upton, NY (United States)]; Ishikawa, M.; Sugino, K. [Japan Atomic Energy Agency (JAEA), Tokai-mura, Ibaraki (Japan)]; Ivanova, T.; Ivanov, E. [Institut de Radioprotection et de Surete Nucleaire (IRSN), Fontenay-aux-Roses (France)]; Kim, S. J. [Korea Atomic Energy Research Institute (KAERI), Daejeon (Korea, Republic of)]; Kodeli, I.; Trkov, A. [Jozef Stefan Institute (JSI), Ljubljana (Slovenia)]; Manturov, G. [Institute of Physics and Power Engineering (IPPE), Obninsk (Russian Federation)]; Pelloni, S. [Paul Scherrer Institut (PSI), Villigen (Switzerland)]; Perfetti, C.; Rearden, B. T. [Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)]; Plompen, A. [Institute for Reference Materials and Measurements (IRMM), Geel (Belgium)]; Rochman, D. [Nuclear Research and Consultancy Group (NRG), Petten (Netherlands)]; Wang, W.; Wu, H. [China Institute of Atomic Energy (CIAE), China Nuclear Data Center, Beijing (China)]; Yang, W. S. [Argonne National Laboratory (ANL), Argonne, IL, US Purdue University, West Lafayette, IN (United States)] 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 97 MATHEMATICAL METHODS AND COMPUTING; BENCHMARKS; CORRECTIONS; CORRELATIONS; CROSS SECTIONS; DATA COVARIANCES; DETERMINISTIC ESTIMATION; ERRORS; EVALUATED DATA; FBR TYPE REACTORS; LEAST SQUARE FIT; MONTE CARLO METHOD; MULTIPLICATION FACTORS; NUCLEAR DATA COLLECTIONS; REACTOR CORES; SCATTERING; SENSITIVITY ANALYSIS; STATISTICAL DATA; TARGETS; VOID COEFFICIENT The Working Party on International Nuclear Data Evaluation Co-operation (WPEC) has been established under the aegis of the OECD/NEA Nuclear Science Committee (NSC) to promote the exchange of information on nuclear data evaluations, validation and related topics. Its aim is also to provide a framework for co-operative activities between the members of the major nuclear data evaluation projects. This includes the possible exchange of scientists in order to encourage co-operation. Requirements for experimental data resulting from this activity are compiled. The WPEC determines common criteria for evaluated nuclear data files with a view to assessing and improving the quality and completeness of evaluated data. The parties to the project are: BROND (Russian Federation), ENDF (United States), JENDL (Japan) and JEFF (other NEA Data Bank member countries). Co-operation with evaluation projects of non-NEA countries, specifically the Chinese CENDL project, is organised through the Nuclear Data Section of the International Atomic Energy Agency (IAEA). This report has been issued by the WPEC Subgroup 33, whose mission was to review methods and issues of the combined use of integral experiments and covariance data, with the objective of recommending a set of best and consistent practices in order to improve evaluated nuclear data files. In particular, it is shown that the statistical adjustment methodologies used worldwide are well understood and essentially equivalent. The results of the benchmark adjustment exercise indicate common trends for important data, even when they start from different basic nuclear data and different covariance matrices. In this respect, adjustment methodologies can provide a powerful tool to improve nuclear data (and associated uncertainties) if used in an appropriate manner. Working Party on International Nuclear Data Evaluation Co-operation - WPEC, Nuclear Science Committee, Organisation for Economic Co-Operation and Development, Nuclear Energy Agency - OECD/NEA, Le Seine Saint-Germain, 12 boulevard des Iles, F-92130 Issy-les-Moulineaux (France) Available from INIS in electronic form NEA 2013-07-01 English Technical Report Other Information: 62 refs. Medium: X; Size: 180 page(s) https://doi.org/ [] NEA-NSC-WPEC-DOC-2013-445 TRN: XN1400011026305 INIS 2014-03-17 22205393