Reactor physics and standards in the framework of European collaborations

This paper discusses some aspects of the standardization of data within European collaborations on reactors. It is not always possible to use identical standards because national projects often have excellent reasons for not changing, e.g., back compatibility. In such cases, intercomparisons are made. Most recommended standards are based on Joint Evaluated File (JEF) Project evaluations. Because of the key role of integral measurements in the validation of recommended data, intercomparison of integral measurement techniques has also been an important activity. The JEF Project is a collaboration between the member countries of the Nuclear Energy Agency (NEA) Data Bank. The main aim of the project is to provide neutron cross-section libraries for thermal and fast reactor calculations. It has been agreed that the standards for cross-section measurements will be the ENDF/B-VI standards internationally accepted by the Organization for European Cooperation and Development/NEA and the International Atomic Energy Agency nuclear data committees. There are close links with the European Fusion File Project