Bulgaria and Russia entered a partnership for the peaceful supply of atomic energy over 50 years ago, on 15 July 1966 with an agreement signed between Bulgaria and the Soviet Union for the construction of a nuclear power plant.

That plant, Kozloduy NPP, built by both Russian and Bulgarian specialists consisted of six Soviet designed power units (VVER reactors) with total installed capacity of 3760 MW. The first four VVER-440 reactors today are closed and are being decommissioned. This is a necessary condition for Bulgaria’s admission into the European Union. Units 5 and 6, which remain in operation, use VVER-1000 reactors.
The designs for the plant were developed by Teploelektroproekt (Moscow) and Energoproekt (Sofia). The majority of the equipment was delivered by the Soviet Union, with some delivery of materials from German Democratic Republic, Czechoslovakia and Hungary. The ground breaking ceremony for Kozloduy NPP was held on 14 October 1969. 

The official opening of Kozloduy NPP was on 4 September 1974.
Start-up of Unit 1: 1974
Start-up of Unit 2:1975
Start-up of Unit 3: 1980
Start-up of Unit 4: 1982
Start-up of Unit 5: 1987
Start-up of Unit 6: 1991

This fruitful relationship continues today. 

Kozloduy NPP has been fueled by reliable Russian nuclear assemblies for over 40 years. 

Present supplies are based on a 2002 contract won after an open tender process.

Rosatom Group companies are heavily involved in modernisation, repair service, spare parts projects  the Kozloduy NPP.

Modernization of power units 5 and 6 of Kozloduy NPP
In 2012-2014 a Consortium named Rosenergoatom Concern OJSC – EDF (Electricite de France) completed a comprehensive examination and evaluation of the remaining lifespan of equipment and structures of power units 5 and 6 -  the first stage of a lifetime extension project for Kozloduy NPP. 
No challenges relating to safe and reliable operation of the power units have been identified.
Work on the lifetime extension of both units commenced in 2012.

In September 2014, Kozloduy NPP signed a contract with the Rusatom Service JSC – Rosenergoatom Concern OJSC - EDF (Electricite de France) consortium for the feasibility justification of lifetime extension of Kozloduy NPP Unit 5 up to 60 years (30 years more than designed lifetime).
The service includes an assessment of the technical condition and justification of the residual service life of reactor equipment and reactor plant pipelines, heat exchanger, pump, transport, technological and electrical equipment, pipelines and valves, and construction of buildings and structures. Inspection of technical condition has been completed. 

All collected data has been provided to Kozloduy NPP in October 2016.


On January 28th, 2016, Kozloduy NPP signed a contract with the Rusatom Service JSC – Risk Engineering (Bulgaria) consortium for feasibility justification of lifetime extension of “Kozloduy” NPP Unit 6 up to 60 years (30 years more than designed  lifetime). The scope of services is similar to work on unit 5 and is expected to take two-and-a-half years. 
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