- 164 - The planned external actions for managing loss of the main cooling system combined with loss of the off-site electrical power supplies and the on-site backup supplies examined by EDF in its complementary safety assessments correspond to the requirements of ASN decision 2011-DC-0213. 5.3.3 Measures envisaged to reinforce the robustness of the facilities with respect to loss of the main cooling system combined with total loss of the off-site and backup electrical power supplies Regarding the measure that could be envisaged to prevent cliff-edge effects or reinforce the robustness of the facility, apart from the measures proposed in case of loss of the off-site electrical power supplies and the conventional backup supplies described earlier, and apart from the measures presented in the preceding paragraphs, EDF has proposed in the CSA reports: to study the means of guaranteeing protection of the equipment necessary for the management of this situation with a flood level (to be defined) that goes beyond the baseline safety standard; to undertake studies to ensure the earthquake resistance of the motor-driven cooling pump, which will allow the same autonomies as considered in the paragraph relative to the loss of the off-site electrical power supplies and the conventional backup supplies to be obtained; to ensure the earthquakes robustness of the measures envisaged in the paragraph relative to the loss of the off-site electrical power supplies and the conventional backup supplies (see § 5.1.2) to cover the present situation. During the technical examination carried out by the IRSN, ASN's technical support organization, EDF also gave a commitment to define a hard core that will include "key" existing and complementary equipment items (fixed or mobile), some of which serve to avoid severe accidents. The resistance of this hard core equipment with respect to certain hazards, the level of which remains to be defined, will be verified. Measures to reinforce the protection of the hard core equipment will also be envisaged if necessary. ASN considers that the improvements proposed by EDF to reinforce the electrical power supply and cooling resources, which comply with the CSA specifications, must be implemented. ASN will require EDF to identify this hard core of reinforced material and organisational provisions, and the requirements it must satisfy.
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