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First REMIX fuel assemblies loaded at Balakovo NPP

Archive of news: All 2022 2021 2020

21.12.2021

Six fuel assemblies with uranium-plutonium REMIX fuel rods have been loaded into the VVER-1000 core during the scheduled outage at unit 1 of the Balakovo NPP. Each REMIX fuel assembly of the standard TVS-2M model contains only fuel rods with a mixture of uranium and plutonium recovered from spent nuclear fuel (312 fuel rods in each bundle).

Earlier in 2021, the trial operation of three experimental fuel assemblies, which included six REMIX fuel rods each, was successfully completed at unit 3 of the Balakovo NPP (in total - three 18 months irradiation cycles).

Such approach fully complies with the global common practice of development and introduction of innovative nuclear fuel. The initial stage usually implies loading of several pilot assemblies with new-type fuel rods (the so-called LTR, or lead test rods programme), then followed by operation of several assemblies consisting of new-type fuel rods only (LTA, or lead test assemblies programme).

“The LTA programme, which implies the operation of REMIX assemblies, is a prerequisite for commercialization and wider introduction of VVER uranium-plutonium fuel. This will give us the additional data, necessary for licensing the full refueling, and also the reference experience, which is important for customers,” commented Alexander Ugryumov, Vice President for Research, Development and Quality at TVEL Fuel Company.

“REMIX fuel is spent nuclear fuel that was reprocessed and then returned back to the reactor,” said Andrey Filonenko, Head of the Laboratory at the Nuclear Safety and Reliability Department, the Balakovo NPP. “The purpose of the technology is to close the nuclear fuel cycle using thermal reactors. At unit 1 of the Balakovo NPP, the new-type fuel was loaded into the reactor core in full compliance with the regulations."

In 2021, the pilot facility for VVER-1000 REMIX fuel fabrication was set up at the Siberian Chemical Combine in Seversk, Tomsk Region (an enterprise of Rosatom’s TVEL Fuel Company) in cooperation with Mining and Chemical Combine (Zheleznogorsk, Krasnoyarsk Territory), which made the fuel pellets from uranium-plutonium mixture.

Full-scale REMIX assemblies will be operated at the Balakovo NPP for three cycles, about five calendar years. During this period, the engineers of the Balakovo NPP will monitor the neutronics and behavior of innovative fuel assemblies.

REMIX (regenerated mixture) fuel is a Russian innovative product for thermal light-water reactors, which make up the basis of the modern nuclear power industry. Its fuel matrix is made from a mixture of reprocessed uranium and plutonium, extracted from spent nuclear fuel. Distinct from uranium-plutonium fuels for fast reactors (such as MNUP and MOX fuel), REMIX fuel has low plutonium content. Its neutron spectrum does not vary from common LWR fuel with enriched uranium, therefore, fuel assemblies behavior in the reactor core and the amount of plutonium bred from uranium due to irradiation are generally similar. For NPP operators, this means that, in perspective, REMIX fuel may be introduced without any changes in reactor design or additional safety measures.

Introduction of such fuel would enable to boost exponentially the feedstock for nuclear power plants due to closing the nuclear fuel cycle, and also to recycle spent nuclear fuel instead of its storage.


TVEL Fuel Company of Rosatom (the Fuel division of the State Corporation Rosatom) includes enterprises for the manufacture of nuclear fuel, conversion and enrichment of uranium, production of gas centrifuges, as well as research and design organizations.

This year the company celebrates its 25th anniversary. Established in 1996, today the company is one of the largest suppliers of fuel for the global nuclear power industry, continues to strengthen its position by implementing new production projects. In the entire history of TVEL, there have been no complaints from customers about the quality of products. Being the only supplier of nuclear fuel for Russian nuclear power plants, TVEL provides fuel to a total of 75 power reactors in 15 countries, research reactors in nine countries of the world, as well as transport reactors of the Russian nuclear fleet. Every sixth power reactor in the world is powered by TVEL fuel.

Rosatom's fuel division is the world's largest producer of enriched uranium, as well as the leader of the global market for stable isotopes. The Fuel Division is actively developing new businesses in the field of chemistry, metallurgy, energy storage technologies, 3D printing, digital products, as well as decommissioning of nuclear facilities. Rosatom's industry integrators for additive technologies and power storage systems have been created in the Fuel Company TVEL circuit. http://www.tvel.ru  



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