Annual Activity Report 2025

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RISK CONTROL AND VIGILANCE PLAN Vigilance plan

prevention (strengthening of the monitoring of inventories of hazardous substances, etc .), and the implementation of standards and indicators across the group. Prevention of the risk of an incident during the transport of chemical or radioactive substances on public roads Description of the risk The group is exposed to the risk of accidents occurring during the transport of chemical or radioactive substances, whether on public roads by rail, sea or road. Risk prevention Compliance with the regulations in force is ensured by all group companies, and particularly Orano NPS (Nuclear Packaging and Services), which operates a “transport supervision” process. This supervision aims to ensure the control of operational, safety, physical and industrial protection risks involving Orano and is based on: ● a real-time monitoring center for the most sensitive transports, providing permanent access to transport information, in liaison with the French State; and ● a crisis management unit that can be mobilized in the event of an incident, trained regularly during drills. In order to ensure the safety and protection of populations, property and the environment in the public domain, the transport of radioactive and nuclear materials is also subject to the principle of “defense in depth”, which consists of setting up successive lines of defense (cask performance, compliance with safety requirements, compliance with security requirements, crisis management organization) to prevent accidents and limit the effects. Where possible, Orano also promotes rail transport. The group carries out its transport operations in accordance with the international and national regulations in force. These regulations are established according to the nature of the material transported and the mode of transport used. In terms of the transport of radioactive materials, nuclear safety is fi rst and foremost based on packaging. The packaging is designed to protect individuals and the environment, both under normal conditions and in transport accident situations, regardless of the mode of transport used: ● packaging protects the public and operators against radiation thanks to proven materials and technologies. Each type of packaging is adapted to the material being transported; ● at the design stage, packages are subjected to a series of regulatory tests designed to demonstrate their resistance and the maintenance of containment and radiological protection in the event of impact, accident, fi re or immersion; and ● the technologies and manufacturing processes used, as well as the maintenance, carried out in accordance with national and international regulations, guarantee the performance of the packages.

Environmental events are fed back at group level via a dedicated HSE digital platform. The Orano group has also developed a severity classi fi cation scale for environmental near-misses and events, ASSESS, in order to promote operating experience feedback and sharing within the group. Each site has an internal procedure governing actions to be taken immediately and in the short term in the event of leak detection (cleaning up the area, checking for contamination and analyzing the causes of the leak). Thanks to these efforts and the sharing of experience, such spills are limited and handled very swiftly. The operations of Orano, as part of its activities, may generate conventional accidents or lead to the uncontrolled release of chemical substances with potential consequences on the environment around the group’s facilities. Risk prevention Prevention of industrial and chemical accidents is a priority for Orano. Industrial Safety Management System On the French sites classi fi ed as high-threshold Seveso, hazard studies are conducted and a prevention policy for major risks is implemented to ensure the protection of the environment and the public. Following several signi fi cant events relating to industrial safety ( fi re, uncontrolled gas emissions), though without signi fi cant impacts on employees, neighboring residents, or mining operations, an ambitious action plan was launched in 2020 to equip mining sites with a system equivalent to the existing industrial safety management system applied for French high threshold Seveso facilities. In 2025, the hazard study of the Katco site in Kazakhstan was updated. Among the achievements carried out on this site this year is the installation of an automatic fi re protection system by intensive deluge-type watering in the Muyumkum ammonium nitrate storage building. This new risk management measure, which is part of the ALARA approach and the industrial safety management system, has enabled the resolution of ammonium nitrate fi re/explosion scenarios at this site to be fi nalized. For more information on nuclear safety and industrial security, see Section 4.3.3.2. Post-Lubrizol action plans Orano took part in the various work organized by France Chimie following the accident at a Lubrizol plant of September 26, 2019, and implemented action plans to improve the prevention of industrial risks based on four components: skills development, improvement of employees’ industrial safety culture, risk Prevention of the risk of an industrial or chemical accident occurring at a facility Description of the risk

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Orano - Annual Activity Report 2025