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On November 23, 2024, Unit 6 of Kozloduy Nuclear Power Plant (NPP) in Bulgaria was successfully commissioned following the modernization of its Reactor Control and Protection System. This marks the completion of another important phase in the joint Ukrainian-Bulgarian project to modernize the control and safety systems of Units 5 and 6 at Kozloduy NPP.
radiy’s collaboration with Kozloduy NPP began in 2007, when radiy specialists, together with NPP personnel, carried out the modernization of the instrumentation and control (I&C) systems at Units 5 and 6. These systems have since been operating reliably for more than 15 years.
Kozloduy NPP is Bulgaria’s only operating nuclear power plant and the largest in the region. It operates two Soviet-built VVER-1000 reactor units, which are similar to those used in Ukrainian NPPs.
Modernization work on Units 5 and 6 began on March 29, 2023, after radiy and radics, together with Bulgarian company ADEN GROUP, won the tender to modernize the safety systems of both units. The contract included the design, manufacture, delivery, and commissioning of the Reactor Trip System and Reactor Power Discharge and Limitation Equipment.
As part of this modernization project, radiy developed technical specifications for the Reactor Control and Protection System, while also manufacturing and pre-testing the equipment sets. Factory acceptance tests were conducted at radiy’s facility for the two delivered Reactor Control and Protection System sets—one for each unit—from April 8 to 12 and July 22 to 26, 2024, respectively. Each system comprises the first (main) and second (diverse) sets of equipment, all designed and manufactured in accordance with the technical specifications, Bulgarian nuclear safety regulations, and international standards, including cybersecurity requirements.
Based on the analysis of technical documentation, test protocols, and factory acceptance results, the commission concluded that the Reactor Control and Protection System, along with other components, met all technical specifications and customer requirements while complying with international nuclear and radiation safety standards.
After completing the successful tests, the I&C systems were shipped to Kozloduy NPP for installation, commissioning, and startup to enhance the safety and efficiency of the plant’s units.
Compared to the Russian-made equipment previously in use at Kozloduy NPP, radiy’s modernized equipment offers the following qualitative advantages:
- Full compliance with the diversity principle between the 1st and 2nd sets;
- Manufactured using advanced hardware components and FPGA technology;
- Developed in line with modern standards for independence, redundancy, single-failure tolerance, and cybersecurity;
- Equipped with a comprehensive diagnostic system that covers over 95% of the hardware and includes archiving and process parameter display capabilities;
- Features a robust system to support maintenance personnel during repairs.
radiy’s modern, licensed equipment ensures that Kozloduy NPP units operate in full compliance with international nuclear and radiation safety regulatory documents.
In addition to delivering and installing the equipment, the modernization project included personnel training for Kozloduy NPP staff. This training focused on the operation, maintenance, and repair of the newly installed systems during the commissioning phase.
Energy security remains a critical priority for both Ukraine and Bulgaria. The successful implementation of this international project not only bolsters Europe’s energy security but also contributes to greater energy stability across the region.
