Verification and validation are essential components of the nuclear data development process, since only those data that have been demonstrated to accurately simulate real-life applications can be relied upon for those applications. While most nuclear data work initially relies on so-called 'differential' measurements (e.g. a cross section for a specific reaction at a specific energy for a specific isotope), systems like nuclear reactors require complete physics for all reactions, energies and isotopes. We refer to data taken from full systems as 'integral' data and for nuclear data evaluations to be useful they must ultimately match with integral experiments that are representative of the applications we want to simulate.
Nuclear data verification and validation has been central to the mandate of the Working Party on International Nuclear Data Evaluation Co-operation (WPEC) since its creation in 1989. In the recent years efforts have been made to more closely integrate the benchmark databases of the International Criticality Safety Benchmark Evaluation Project (ICSBEP) and the International Reactor Physics Evalaution (IRPhE) Project, using these data to pin-point areas for improvement that will have an impact on applications of interest.
Recent subgroup of the WPEC have included the Validation of Nuclear Data Libraries (VaNDaL) project, which has worked on consolidating, harmonising and providing quality assurance methods for the input suites of benchmarks used for nuclear data validation.
The NEA's nuclear data evaluation co-operation activities involve the following evaluation projects: ENDF (United States), JENDL (Japan), ROSFOND/BROND (Russia), JEFF (other Data Bank member countries) and CENDL (China) in close co-operation with the Nuclear Data Section of the International Atomic Energy Agency (IAEA).
WPEC Subgroup 47 (SG47) works in close coordination with other NEA activities such as WPRS Expert Group on Radiation Transport and Shielding (EGRTS), WPEC SG45, SG46, Collaborative International Evaluated Library Organisation (CIELO) Pilot Project and the JEFF project, where the work could be used to guide the evaluations. Feedback from these groups on the specific needs and the use of Shielding Integral Benchmark Archive and Database (SINBAD) data is expected. SINBAD evaluation work shall be tightly coordinated with the interest of SG46 on Efficient and Effective Use of Integral Experiments for Nuclear Data Validation. Past experience in integral benchmark evaluations from the International Criticality Safety Benchmark Evaluation Project (ICSBEP), the International Reactor Physics Experiment Evaluation (IRPhE) Project and SINBAD will be valuable.