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EDF said its latest estimate was for construction costs at Flamanville now standing at 12.4 billion euros.
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In July 2018, just months after welding problems at Flamanville were first reported, EDF had already added 400 million euros to the budget.
In June this year, EDF said the reactor startup, which had initially been scheduled for 2012, would be delayed by another three years till end 2022.
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