"EDF employees working at nuclear power plants are going on strike," RIA Novosti quoted the union as saying.
The workers explained their decision by the fact that the draft law on pension reform was moved to the Senate for discussion.
On February 11, demonstrations against raising the retirement age in France drew 963,000 people.
On February 7, it was reported that riots broke out at a demonstration against pension reform in Paris.
The police fired tear gas at the demonstrators.