The PPRT Study Perimeter is defined by the curve of the effects of hazardous phenomena of one or more ICPE Sévéso High Threshold (AS) establishments.
Dangerous phenomena whose probability is made sufficiently low by a passive safety measure or by active safety measures meeting certain criteria shall be excluded.
The Study Perimeter will be the starting point for a hazard mapping by combining the types of effects, intensities, and probabilities of dangerous phenomena (7 hazard levels). The intersection of urban issues, hazards, and consultation will lead to a mapping of urban areas (4 level of regulation). For more information: http://www.ecologie.gouv.fr/IMG/pdf/Plaquette_PPRT_finale_1_.pdf
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