- 192 - ASN will also be asking EDF to perform a detailed study on the possibilities for improving the U5 venting-filtration device, taking account of the robustness to hazards, the efficiency of filtration in the case of simultaneous use on two reactors, the improvement of filtration of fission products, in particular iodine and the radiological consequences of opening, especially in terms of accessibility of the site, the emergency management rooms and the control room. Following the CSA on the EPR reactor, ASN considers that the design of this EPR reactor already ensures improved protection with regard to severe accidents. Of the planned equipment, EDF shall identify that which is to be a part of the hard-core for the prevention and limitation of the consequences of a severe accident, including systems or equipment to depressurise the reactor coolant system, isolate the containment and control the pressure in the containment. ASN will issue a requirement on this subject. ASN also notes EDF's commitment to study the feasibility of implementing a system able, in a total loss of electrical power situation, to ensure the alkaline nature of the water in the IRWST tank. EDF has undertaken to perform a feasibility study for mid-2012.
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