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[en] Extensive scope of scientific and technological work has been carried out in SSC RF RIAR to substantiate usage of vibropack oxide fuel pins in fast and thermal neutron reactors. In fulfilling the work, physical-mechanical and technological characteristics of granulated fuel have been studied, radiation tests and material science investigations of mock-up, experimental and research fuel pins of BN-type (in BOR-60 and BN-600 reactors) and WWER-1000 type (in SM-2 and MIR reactors) have been carried out. Total quantity of fabricated fuel pins is about 30 000 pieces. In BOR-60 reactor, maximum burn-up attained 30% h.a. for regular SA and burnup was of 32,3% h.a. for experimental fuel pins of the dismantled SA. In testing UPuO₂ vibropack fuel pins in BN-600 reactor, maximum burn-up of -10,8% h.a. was attained. Post irradiation examinations of fuel pins have revealed that since the problems of both chemical and thermo-mechanical fuel-cladding interactions have been solved, the resource of the fuel pins like these would only depend on the choice of cladding material. Vibropack fuel pins, containing UPuO₂ under conditions of MIR reactor attained burn-up more than 30 MW day/kg U both under nominal operation and under load-following modes. The experience in designing, manufacturing and operating the facilities on fabrication of granulated uranium and MOX fuel and fuel pins is gained. The data bank and calculation codes, describing vibropack fuel pin behavior under different operation modes is created. According to the Concept of RF Minatom on recovery of surplus weapon-grade plutonium, resulting from disarmament, the State Scientific Center of Russian Federation RIAR (Dimitrovgrad) has begun a practical realization of the technology on conversion of metal weapon-grade plutonium into mixed uranium-plutonium oxide fuel. Processing has been carried out and granulated UPuO₂ fuel for BOR-60, BN-600 reactors and experimental batches of granulated fuel for mock-up and experimental fuel pins of WWER type, which are intended for testing in SM and MIR reactors, are obtained. (author)