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Description
EDF must ensure the regulatory compliance of most of its electricity generation facilities, including nuclear power plants, wind farms, combined-cycle gas turbines, and diesel engines. With regard to environmental acoustics, this requires verifying sound pressure levels at site boundaries and at the nearest residential receptors. These verifications are based on field measurements. However, for preliminary design studies of new facilities, extensions of existing sites, or the implementation of noise mitigation solutions, numerical predictions are required.The software used to perform these numerical studies is Code_TYMPAN, developed by EDF DTG and distributed under an open-source license. This engineering software follows the recommendations of the international standard ISO 9613; its “historical” solver also incorporates R&D contributions, particularly concerning ground effects. In recent years, numerous developments have improved the stability and usability of the software, and introduced a solver that strictly complies with ISO 9613 (1996 and 2024 versions).This paper focuses on two typical examples: a fictitious model representative of a nuclear power plant and a hydropower site located in steep, confined terrain. The comparison of calculated results provides insights into the validity of the numerical models. These models also make it possible to examine the relevance of acoustic modeling in borderline cases.