Orano - Annual Activity Report 2025 184 4 SUSTAINABILITY STATEMENT Environmental information Prevention of accidental spills Preventing any accidental spills is an issue for Orano because of the potential consequences that can be significant on employees, populations, fauna and flora, and on the creation of environmental liabilities. The procedure for preventing accidental spills of radioactive or hazardous substances into the environment must be applied during all phases of the life of the facilities (design, construction, operation, shutdown and decommissioning). In application of the ALARA principle, a risk reduction approach at source is implemented (limiting the hazardous nature of the substances used, limiting the quantities stored, etc.). Active consequence mitigation systems must be implemented and integrated into incident management systems. Nuclear industrial safety systems are detailed in Section 4.3.3.2. Preventing impacts on the environment and the creation of liabilities through a comprehensive environmental approach Limiting impacts also covers all areas and nuisances specific to each type of facility (bacteriological, visual, biodiversity, noise pollution, pollution related to road and rail traffic, olfactory impacts, vibrations, dust, light emissions, electromagnetic fields, etc.), throughout their lifetime (from design studies to decommissioning and post-operation monitoring). Orano’s HSE policy sets a framework and objectives to reduce and control all environmental aspects in an approach proportionate to the issues. This strategy is part of the desire to promote a second life for the sites operated. The objective of minimizing the environmental footprint is based on a structure and organizations at all levels, including, in particular, the following areas: ● continuously reducing impact factors (consumption of natural resources, waste, etc.); ● identifying and measuring the impact of the activity on the environment; and ● researching and developing new solutions to limit impacts. 4.2.4.3 Targets and results related to liabilities management and sites end-of-life The group monitors the progress of decommissioning by facility. There is no consolidated indicator at group level, nor any group quantified target in this area. As part of its new roadmap, Orano aims to finalize two symbolic remediation actions by 2030: the deconstruction of the cooling towers of Georges Besse I on the Tricastin site and the end of the cleanup of the Parc aux Ajoncs (PAA) at Orano la Hague. This objective contributes to the reduction of the risks identified in the materiality analysis. The deconstruction of the cooling towers began at the Tricastin site in 2024 and continued in 2025 (see box in Section 4.2.4.1). Studies regarding the clean-up of the Parc aux Ajoncs (PAA) have begun. Orano Mining has set targets for the management of mine tailings and site remediation for 2030: ● move towards passive management of tailings storage for new mining sites; ● bring all tailings processing storage facilities into compliance with the GISTM Standard and disclose annually from August 2025, for each site, the reports on compliance with the Standard. This objective is part of the overall approach to preventing accidental spills described in Section 4.3.3.2. It helps reduce the probability of an accidental spill and the risks identified in the materiality analysis. Since August 2025, Orano has published information for all its tailings facilities on its website. In terms of accidental spill prevention, the group did not report any major environmental pollution incidents (ASSESS level 4 and above) in 2025.
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