Temelín nuclear plant in Czech Republic to modernize safety systems by 2029

The Temelín nuclear power station is undertaking a major upgrade of its safety and control systems, concentrating on the plant’s second reactor block. Around 273 power‑supply components—including safety pumps, critical shut‑off valves and low‑voltage adapters supplied by a Přibram firm—will be replaced to provide stable, low‑voltage power (5‑24 V) for the delicate electronics that monitor the block’s safety.

The project, funded by ČEZ with an investment of 3.8 billion CZK (about 700 million CZK more than the previous year), aims to ensure long‑term operational safety through 2029 and beyond. ČEZ works with Westinghouse and Czech control‑system manufacturer ZAT, which supplies new power sources while retaining the original units as reserve for the first block. The upgraded hardware operates in an isolated environment to guarantee cyber‑security, using proven technologies alongside ongoing hardware and software development.

Overall, the modernization seeks to sustain the plant’s reliability for decades, supporting Czech energy security and extending the service life of both Temelín and the country’s nuclear fleet.