Irregularities have been found in around 50 Areva-made components installed in French nuclear reactors, nuclear regulator ASN said on Tuesday.
It said that after the discovery of weak spots in the reactor vessel of the EPR reactor under construction in Flamanville, France last year, Areva began a review of manufacturing procedures at its Creusot steel forging plant.
In a statement, ASN said it had been informed by Areva that its investigation had found evidence of irregularities in about 400 components produced since 1965, of which some 50 are believed to be in use in French nuclear plants.