Article R1321-11 of the French Public Health Code
I.-The holder of an authorisation declares to the Prefect any project to modify the installations and operating conditions mentioned in the prefectoral authorisation order and sends him all the information needed to assess the project, prior to its implementation. The Prefect gives a decision on this declaration within two months, either by issuing an amending order, or by inviting the holder of the authorisation, where appropriate after consulting an approved…