France’s Autorité de Sûreté Nucléaire (ASN – Nuclear Safety Authority) said on 16 March that EDF notified it of a significant event relating to a design deviation concerning three taps of the main primary circuit of the EPR reactor under construction at unit 3 of the Flamanville NPP. The main primary circuit contains the water which cools the reactor core and transfers the energy resulting from the nuclear reaction to the steam generators. This circuit is made up of four piping loops which are installed in the reactor building. Several auxiliary circuits are connected to the main primary circuit, through nozzles. The most important nozzles are integrated by forging during the manufacture of the main piping. Small diameter taps (less than 150 mm) are connected to the main primary circuit piping by means of a connection welded to the main piping called “set-in”. Three of these taps are affected by the deviation, ANS noted.
Nuclear Engineering International 18th March 2021 read more »
EDF notified France’s nuclear safety regulator, the Autorité de Sûreté Nucléaire (ASN), on 3 March of a significant event concerning a design anomaly on three nozzles of the main primary system of the EPR reactor under construction at Flamanville. The concerned nozzles were produced in 2011 based on a 2006 design file. The regulator has asked EDF how it plans to deal with this anomaly.
World Nuclear News 23rd March 2021 read more »