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Well, I found the data about "Laboratoire souterrain à bas bruit de Rustrel", which was build in one of former Plateau d'Albion command centers. The description states that the structure was designed to 20 bar (290 psi) overpressure. Considering that silos were build in late 1960s, it looks reasonable that they were build to survive about 300+ psi overpressure.
