ÚJV Řež, a. s.

ÚJV Řež, a. s., also known as Ústav jaderného výzkumu, is a Czech joint‑stock company engaged in research and development. Its core activities centre on nuclear energy safety and the development of radio‑pharmaceuticals for medical applications. The institute conducts research that supports the safe operation of nuclear facilities. It also works on the production, quality control, and application of isotopes used in diagnostics and therapy. These activities serve customers in the nuclear power sector as well as in healthcare organisations that rely on its specialised expertise.

While the exact size of its workforce or annual turnover is not disclosed in the available sources, the organisation maintains its headquarters in Czechia. The ransomware attack on 25 November 2022, which encrypted economic data but did not affect reactor operations, shows that it manages both administrative IT systems and technical nuclear infrastructure. This incident highlights the institute’s responsibility for protecting sensitive scientific and economic information within the Czech nuclear sector. As a joint‑stock company (a. s.), ÚJV Řež operates under Czech corporate governance rules, and no parent or subsidiary relationships are specified in the public record. Its distinguishing attribute is the combined focus on nuclear safety research and radio‑pharmaceutical development, a niche that sets it apart from other Czech research organisations.