The OECD/Nuclear Energy Data Bank was established by its member countries as an institution to allow effective sharing of knowledge and its basic underlying information and data in key areas of nuclear science and technology. The activities as regards preserving and transferring knowledge consist of the: — Acquisition of basic nuclear data, computer codes and experimental system data needed over a wide range of nuclear and radiation applications. — Independent verification and validation of these data using quality assurance methods, adding value through international benchmark exercises, workshops and meetings and by issuing relevant reports with conclusions and recommendations, as well as by organising training courses to ensure their qualified and competent use. — Dissemination of the different products to authorised establishments in member countries and collecting and integrating user feedback. Of particular importance has been the establishment of basic and integral experiments databases and the methodology developed with the aim of knowledge preservation and transfer. Databases established thus far include: — IRPhE – International Reactor Physics Experimental Benchmarks Evaluations, — SINBAD – a radiation shielding experiments database (nuclear reactors, fusion neutronics and accelerators), — IFPE – International Fuel Performance Benchmark Experiments Database, — TDB – The Thermochemical Database Project, — ICSBE – International Nuclear Criticality Safety Benchmark Evaluations [1], — CCVM – CSNI Code Validation Matrix of Thermal-hydraulic Codes for LWR LOCA and Transients [2]. This paper will concentrate on knowledge preservation and transfer concepts and methods related to some of the integral experiments and TDB
