- 260 - The quantity of water that could reach nuclear materials would thus be limited to the volume of the heating hot water system, that is to say 0.5 m3. In the interim, the CEA specifies that part of the fissile material inventory is going to be transferred to the new Magenta facility. Apart from the abovementioned provisions, the CEA has undertaken in the framework of the complementary safety assessment to examine, and if necessary take various measures to transiently reinforce the robustness of the facility: plug the openings in the facade walls of the BSM; install a coaming at the sodium store entrance to prevent the ingress of any water runoff at ground level; give a gradient to the external platform. On completion of the complementary safety assessment review for Masurca, ASN considers that the licensee must remove the fissile materials from the BSM into a facility built to earthquake design standards in application of RFS 2001-01. ASN will issue a requirement in this respect, setting the completion deadline. 2.5 General provisions relative to the seismic risk As a general rule, the licensees must continue the initiatives to better assess the uncertainties inherent to the databases and prediction models, and to characterise the site effects. Moreover, further to the CSAs, and in order to increase the robustness of the facilities, ASN will ask the licensees to define the requirements applicable to the hard core of reinforced material and organisational provisions defined in paragraph 1.3 above. When defining the earthquake resistance requirements for these hard core provisions, the licensees will have to adopt significant fixed margins with respect to the current frame of reference (RFS 2001-01 in particular). ASN will be issuing requests in this respect, some of which could become requirements.
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