This could lead to mechanical properties of the steel that are lower than expected, thus compromising the safety of the reactors, which is based on the preclusion of failure of these components. These analyses concluded that the channel heads in certain steam generators were concerned by this anomaly. EDF informed ASN that it will shortly be sending its additional data regarding the 1450 MWe reactors.Īt ASN’s request, EDF initiated a programme of analyses in 2015 to identify the equipment on its reactors in service which could be affected by a carbon concentration anomaly in the steel used. With the support of IRSN, ASN examined the information transmitted by EDF to demonstrate the serviceability of the channel heads on the steam generators 1 manufactured by JCFC 2 and equipping ten 900 MWe reactors and two 1450 MWe reactors.ĪSN considers that provided that its requests are taken into account, the generic demonstrations provided by EDF are acceptable for the 900 MWe reactors and can be used on each of the reactors concerned with a view to ASN authorising their restart.
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