The mostly state-owned company, which had forecast losses of 4.9 billion euros, said it would make savings worth around one billion euros over the next few years and announce a financing plan by the end of March.
"The scale of the net loss for 2014 illustrates the two-fold challenge confronting Areva: continuing stagnation of the nuclear operations, lack of competitiveness and difficulties in managing the risks inherent in large projects," chief executive Philippe Knoche said in a statement.
The company also said earlier there were impairment charges that brought total write-downs on assets and losses on projects to 4.35 billion euros.
The company, which is 87-percent owned by the French state, has suffered in recent years as interest in nuclear power has cooled following the 2011 Fukushima catastrophe in Japan.
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Areva announced in October that it would cut investments and step up sales of non-strategic assets as it tries to shore up its finances.
"The challenge for all of us today is to implement the transformation plan in all its aspects, to make Areva, in the French nuclear industry, a refocused, simplified, competitive group in a position of recovery," said Knoche.