The Center for Thermophysical Data (CTD) [1] was founded in 1980. In 1986, at the decision of Soviet State Committee on Atomic Energy, it was raised to the status of an industry center, and as such it is a unit of the industry system of standard reference data.The main task of the Center is to provide scientific and design studies of reliable information about the thermohydraulics of nuclear power plants. To fulfil this mission, a technology of preparation, processing, and analysis of information, making it possible, in interaction with qualified specialists (experts) at the Thermophysical Division of the Physics and Power Engineering Institute (PPEI) and other enterprises, to prepare for dissemination of very accurate and reliable information, has been created at the Center. Aside from the content of the information base, experience in developing and adopting the information technology accumulated at CTD is certainly of interest and may be helpful for other fields of knowledge.Technology of Information Accumulation. The main principles adopted for the construction of an information technology are as follows:directed at all users who are included in scientific and design work for nuclear power plants; possibility of tracing the type of information (experimental, estimated, recommended), origin and history of any unit of storage (author, accompanying information); oriented toward different computer platforms. The technology includes: acquisition of experimental data on thermohydraulic processes in different power equipment followed by construction of an archive, thematic compilations, and databanks; assessment and analysis of experimental data for generating reliable and comprehensive, well-grounded, working recommendations; expert assessment of the reliability of recommendations and their computational testing; preparation and publication of periodic collections of recommendations (RTM); development of specialized databanks and more complicated program products, such as knowledge bases based on recommended information.Archive of Experimental Data. The experimental data from thermophysical investigations enter an archive [2, 3], and they are tested by different methods and archived in accordance with a thematic heading, which is the basis of search operations. The archive consists of a structured collection of text files and all archiving operations are performed under the control of a specially developed system of programs. The source of information on the contents of the archive are useraccessible catalogs, including KATED database (MS-DOS, personal computers).At present, the archive contains data on the following subjects: crisis of heat emission during flow of water in circular, rectangular, and triangular pipes, ring channels and rod bundles; true volume steam content in pipes, ring channels, rectangular slits, and rod bundles; pressure drop in two-phase flow for rod bundles; hydraulic resistances in one-phase flows for rod bundles; heat transfer to water, gases, and liquid metals for rod bundles;
