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The operational safety of nuclear installations as well as research in this field are the permanent focus of the company's attention.


  • The ÚJV Řež, a. s. Nuclear Safety and Reliability Division is engaged in research in the following fields:
    • Thermohydraulic analyses;
      • Development of methods corresponding to the current state of development;
      • Verification of safety criteria on experimental databases, computation programs on experimental equipment, and measurements from NPP;
      • Development of applications of detailed computation programs to analyse the mixing of coolant in NPP circuits, in fuel assemblies and in containments.


  • Fuel behaviour in operating and emergency conditions:
    • Best-estimate analyses of damage to nuclear fuel cladding and evaluation of the release of source term into coolant.


  • Severe accidents:
    • Accident phenomenology research.


  • Radiation safety:
    • Modelling of the spread and deposition of radioactive substances into the vicinity from different source types;
    • Forecasts for the development of radiation situation after the release of radioactivity, proposals for immediate measures to protect the population, optimisation of activities carried out by intervening services and monitoring groups.


  • Modelling and visualisation:
    • Creation of 3D models of exteriors and interiors of nuclear unit, visualisation of the spread of harmful substances into the atmosphere;
    • Preparation of virtual 3D models of NPP systems and components for the needs of personnel training;
    • Preparation of virtual 3D models for the needs of nuclear power plant lifetime end planning (decommissioning) and optimisation and training of dismantling of contaminated equipment.


  • Reliability and PSA:
    • Reliability and risk analyses of complex modern technologies with high requirements on reliability and safety of operation, identification of weaknesses in the operation and design, draft modifications and remedial measures;
    • Reliability analyses of production and supplies;
    • Risk monitoring of nuclear and non-nuclear installations;
    • Optimisation of maintenance programs while applying the RCM principles (Reliability Centred Maintenance);
    • Human factor reliability analyses.