[en] The operation experience of the nuclear power plant ARBUS designed and constructed as a NPP of small power prototype for operation in remote districts is generalized. As a moderator in the reactor core and primary circuit coolant the following high temperature organic coolants have been used in turn: hydrostabilized gasoil, hydriged terphenyl, hydroterphenyl, ditolylmethane. Main technological parameters and a principle scheme of the plant are presented. The results of the investigation of thermal physical properties of coolants and product output rate of their decomposition are considered. The problems of coolant cleaning and regeneration and the problems of heat-generating assemblies cleaning are discussed. Radiation conditions and plants equipment failures are analyzed. On the basis of the analysis of the ARBUS plant operation experience the conclusion is drawn that the reactor with an organic coolant is simple and efficient in operation it provides possibility to quickly accumulate and to drop loadings, it does not require numerous service personnel. Application of standard equipment and armature is possible when using reactors with an organic coolant. Low coolant steam elasticity and its weak coorrosion activity allow efficient using for the first circuit thin-walled tubes and carbon steel equipment. The radiation-thermal decomposition of organic coolant process accompanied by polycondensation high-boiled product deposition of fuel elements of the reactor core is a serious obstacle to efficient operation of heat supply nuclear power plant