France’s nuclear regulator, Autorité de Sûreté Nucléaire (ASN), has approved the conditional restart of 10 nuclear reactors in France that have been offline while the safety case for the units has been under review. ASN said in a statement on 5 December 2016 that together with its technical support organisation, the Institute for Radiological Protection and Nuclear Safety (IRSN), it had reviewed information provided by nuclear operator EDF concerning reactors whose lower heads on the primary side of steam generators were manufactured by Japan Casting and Forging Corporation (JCFC). The reactors concerned are ten 900-MW and two 1,450-MW units. ASN said EDF can restart the ten 900-MW units once the safety case has been confirmed by a programme of further tests. Each reactor restart will still be subject to ASN’s agreement.
Nucnet 6th Dec 2016 read more »
The French nuclear safety authority has accepted analyses submitted by EDF on the serviceability of ten of its 900 MWe reactors in which some steam generator parts were found to contain high concentrations of carbon. The utility will soon submit analyses for two 1450 MWe units. In June, the French regulator, the Autorité de Sûreté Nucléaire (ASN), said it had identified 18 French nuclear power reactors operated by EDF – of both 900 MWe and 1450 MWe capacity – whose steam generators could contain high carbon concentrations. Of these, 12 are equipped with channel heads manufactured by Japan Casting and Forging Corporation (JCFC) “liable to contain a particularly high carbon concentration”. A high carbon content in steel can lead to mechanical properties lower than expected. EDF has since provided ASN with data aimed at demonstrating the operating safety of the 12 reactors concerned. However, the regulator called for additional inspections to be carried out to verify whether each of the channel heads concerned conforms to the data submitted by EDF. These inspections have already been conducted or are in progress during scheduled outages.
World Nuclear News 6th Dec 2016 read more »
EDF will spread out through to the end of the year the restart of the reactors that have been fully checked and soon expected to obtain final clearance from French nuclear safety authority ASN, an EDF spokesman said Tuesday.
Platts 6th Dec 2016 read more »