Not sure about those claimed backdoor agreements? The current german government coalition would certainly never have agreed to some deal like this. And the last government (Merkel) even abandoned nuclear power production within Germany altogether after the Fukushima accidents. France needs to overhaul it's entire nuclear infrastructure. Some priority EU support funding because of being tagged "green" now will come in quite handy.
BTW The germans buy nuclear power made elsewhere and face nuclear power plants next door in neighbouring countries close to their border.