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"The costs related to the ASN's recommendations will be around 10 billion euros," an EDF spokeswoman said. French nuclear power operator EDF will need to install flood-proof diesel generators and bunkered remote back-up control rooms at its 19 plants across the country or else face having to shut down some of its 58 reactors, the ASN said in a report handed over to France's prime minister on Tuesday. France must improve the safety systems of its nuclear facilities so they can withstand the kind of extreme shocks that triggered in Fukushima the worst nuclear accident in 25 years.