- 113 - Paluel NGFN 7.40 Thousand year storm surge + tide 120 25.30 on 30/06/2011 - N/A Penly NGFN 7.74 Thousand year storm surge + tide 120 12.00 on 30/06/2011 - N/A Saint Alban NGFO 147.46 REB 147.00 on 30/06/2011 147.05 With infinite settling Saint -Laurent NGFO 83.47 CMM 83.65 on 30/06/2011 83.58 With infinite settling Tricastin NGFO 50.90 Rhone lowwater channel21 CMM 52.00 on 30/06/2011 51.85 With infinite settling 59.56 Donzère Canal NGFN: French normal general datum system normal NGFO: Orthometric datum system CMS: flood safety margin level CMM: maximum thousand year flood REB: dam burst or collapse GCA: Grand Canal dAlsace NI: nuclear island N/A: not applicable In parallel, ASN and IRSN launched a revision of RFS I.2.e concerning the inclusion of the flooding risk, taking account of all the work done since the flood at the Le Blayais nuclear power plant. The new guide for BNI protection against the flooding risk will concern the choice of hazards liable to lead to flooding of the site and the methods for characterising them all. This draft guide was the subject of a consultation in June 2010, broadened to include the general public (www.asn.fr). After consideration of the remarks collected, the guide will be submitted to the advisory committees for their opinion. They will be meeting in May 2012. ASN aims to distribute this new guide in 2012. 3.1.2 Measures to protect facilities from the flooding risk, including in the design process In its CSA specifications, ASN asked EDF to describe the steps taken to protect the facility in the event of a CMS. ASN in particular asked EDF to identify the structures, systems and components (SSC) which must remain available after a flood to ensure a safe state, including the steps taken to ensure the operation of the pumping station and the measures to guarantee the backup electricity supply. ASN also asked EDF to identify the main design measures to protect the site against flooding (level of the platform, of the embankment, etc.). In addition, ASN asked EDF to clarify the main operating provisions (including emergency procedures, mobile equipment, etc.) for issuing an alert of an imminent flood and then for mitigating the consequences of the flooding. 21 The low-water channel, or ordinary bed designates the space occupied permanently or temporarily by a water course. The flood plain is differentiated from the low-water channel, which is the zone limited by the banks. The flood plain is the space occupied by the water course when in flood.
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