- 132 - ASN considers that EDF must take account of the extreme meteorological conditions linked to flooding in the definition of the "hard core" (see § 8). With regard to the EPR, EDF states that to prevent any cliff-edge effect beyond the baseline safety standards, the additional equipment that could be deployed following the CSAs will be designed for or protected against extreme climatic conditions. ASN considers this approach to be satisfactory. 4.2.2 Measures envisaged to reinforce the robustness of the facilities to extreme meteorological conditions In its specifications, ASN asked EDF, on the basis of the conclusions of the previous analysis, to state whether measures could be envisaged for preventing these cliff-edge effects or to enhance the robustness of the facility (modification of the design, modification of procedures, organisational measures, etc.). Concerning the reactors in operation, during the examination in preparation for the meeting of the advisory committees in November 2011, EDF made an undertaking to study the ability of the venting-filtration system required in the event of a severe accident (filter U5) to withstand the direct and indirect effects of wind, as well as the ability of the equipment needed to operate the emergency management centres and situated outside the building to withstand the indirect effects of wind. Moreover, to reinforce the robustness of the facilities, EDF states that a preventive maintenance programme for the "Hot, non-IPS structures" and a maintenance programme for the "turbine hall" are currently being drafted. They will cover the metal cladding. EDF considers that maintenance of the cladding will limit the risk of it being damaged by a storm, for the buildings within the scope of these maintenance programmes and will thus increase the protection of the facilities against the lightning-related risks. In addition, ASN will ensure that the definition of the "hard core" takes account of the extreme meteorological conditions linked to flooding. Concerning the EPR, EDF states that in order to prevent any cliff-edge effects beyond the baseline safety standards, the additional equipment that could be deployed following the CSAs will be designed for or protected against extreme climatic conditions. ASN considers this approach to be satisfactory.
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