- 172 - earthquake and high winds. EDF also indicates that it will undertake a general reflection on the BDS's to identify the needs in order to improve the organisation and habitability of the emergency rooms. Lastly, EDF undertakes to carry out a study comprising firstly a per-site appraisal of the emergency equipment storage conditions and the resistance of the storage premises to the different types of hazard considered (earthquake, climatic event, flooding, etc.) and secondly the identification of improvements to cope with it. Furthermore, managing an H1 or H3 situation involves many tasks, not only in the control room but above all in the facilities. EDF's reports on the CSAs provide little information on the conditions of performance of these tasks: the atmosphere in the rooms (particularly the temperature which can be very high if there is no ventilation), accessibility in case of hazard damage, available human resources to carry out these tasks on all the facilities. The information presented by EDF in the CSA reports does not guarantee the resistance, habitability and accessibility of the emergency management rooms and control rooms in the extreme situations analysed for the CSAs and in case of opening of the U5 system filter. ASN points out that the emergency organisation on the sites relies on having premises which must be available to manage the emergency for the required duration. ASN will therefore require EDF to ensure that these emergency management rooms, situated on or near the site and providing personnel protection (among other things), can withstand the extreme situations analysed in the CSAs and form part of the "hard core". They shall be accessible and habitable during long-duration emergencies and designed to accommodate the crews necessary for long-term site management. ASN also considers that the control and monitoring of all the reactors on the impacted site must be ensured in the event of hazardous substance releases or opening of the venting-filtration system (U5). ASN thus considers that everything must be done so that opening of the U5 system on a reactor does not prevent the management of all the reactors on the site, considering that their condition at that moment may be more or less degraded. In this respect, ASN will attentively analyse the encompassing but nevertheless realistic nature of EDF's study to assess the consequences of opening the U5 system filter on the habitability of the control room, the emergency shutdown panel, and the management of the site as a whole. ASN will require EDF to ensure the control and monitoring of all the reactors of a site in the event of hazardous substance releases or opening of the U5 venting-filtration system from the control rooms, the emergency shutdown panels or the emergency management rooms. Furthermore, ASN will ask EDF to define the human actions required for the management of the extreme situations studied in the CSAs, including situations affecting several reactors and those that could have an impact on the accessibility and habitability of the emergency management rooms. EDF will verify that these actions can effectively be performed under the working conditions that could be encountered in such scenarios. EDF will take account of the relief of the emergency teams, the logistics necessary for the interventions, and will indicate any material or organisational adaptations envisaged. This request will be taken up in an ASN requirement. Lastly, ASN will require EDF to submit a list of the necessary emergency management skills, specifying whether these skills could be held by outside contractors. EDF will provide proof that its organisation ensures the availability of the necessary skills in a emergency situation, and notably when it is possible that outside contractors will be used. Feasibility and effectiveness of measures to manage accidents in case of external hazards (earthquake, flooding): EDF indicates in the CSA reports that application of the procedures by the operators in the control room is not affected by an external hazard (earthquake, flooding), as the control room is robust to the design-basis hazards. In the event of a severe accident combined with flooding or an earthquake, EDF specifies that the equipment used in the reactor containment will not be damaged. The operating team has procedures for dealing with this situation and managing its consequences (loss of heat sink in particular). The actions to carry out in the facilities must be secured, particularly if building lighting is lost. The communication means used in normal operation could be rendered inoperative by the external hazard.
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