That's simply not true. Nuclear has always and is still receiving significant indirect subsidies. A huge subsidy that nuclear power gets is that plants are not insured against incidents (because essentially nobody is willing to sell them insurance), so it's essentially the state that does it. Also many argue that the nuclear waste storage costs are significantly underestimated, I mean I understand estimating cost for safe storage for thousands of years is difficult.

Interesting you mentioned France, the only project they are building is Flammanville 3 which started in 2007 with an estimated cost of ~3 billion euros, it is now estimated to go online in 2022 with an estimated cost of 19 billion euros. That's just construction cost.

Regarding the cost for decommissioning, the European commission has actually called out France for currently significantly underfunding the cost by a factor of 3 or 4.