- 168 - deployment, the time necessary for its deployment, the required assembly processes and the associated list of periodic tests. To verify the permanence of availability of these devices and the resistance of the premises in which they are stored, EDF undertakes for each site to appraise the emergency equipment storage conditions and their resistance to the various types of hazard considered in the CSAs. This study will identify the required reinforcements. ASN considers that the study proposed by EDF will provide useful information for assessing the resistance of the emergency equipment storage premises. Moreover, during its inspections ASN observed that the equipment necessary for emergency management, and in particular the MMS (mobile safety equipment), the PUI equipment and the MDC (complementary domain equipment), was not managed satisfactorily by the sites and that the storage conditions did not guarantee permanent availability, particularly in the event of external hazards. For ASN, the equipment necessary for emergency management must be included in the "hard core" of tightened material and organisational provisions (see section 16). The devices, their storage places and deployment procedures must be identified in the site PUIs. They must be tested regularly, and training in their deployment must be provided during exercises. ASN will issue a requirement on this subject. Management of supplies for the diesel generators: In the CSA reports, EDF presents information on the autonomy of the diesel generators and the provisions for extending their utilisation is the event of loss of off-site power (LOOP). This point is detailed in paragraph 5 of this chapter. The minimum guaranteed autonomy for fuel is 3.5 days per generator set in the least favourable load conditions. The conditions of supply are covered by a national contract, which provides for delivery within 24 hours in emergency situations. Strategic reserves of fuel are held specifically by EDF. The sites have sufficient oil reserves to guarantee an autonomy of more than 3 days. Beyond this, supply is guaranteed by measures specific to each site. For all the plant series, the initial water reserves for cooling the diesel generators are sufficient to ensure two weeks' autonomy. Diesel generators have an independent air-water cooling system. Each diesel generator has a compressed air reserve that allows 5 start-ups. ASN considers that the supply management methods are capable of guaranteeing 3 days autonomy for the generator sets. ASN considers that EDF must ensure the reliability of the on-site fuel and oil stocks and their replenishment under all circumstances to ensure at least two weeks' autonomy (see § 5). Management of radioactive releases and measures to limit them: In the CSA reports EDF describes the measures implemented on the sites to manage and limit radioactive releases. The requirements relative to containment monitoring are thus set out in a procedure applied by the safety engineer in an accident situation before entry into a severe accident condition, and in a containment monitoring guide used by the emergency teams. In a severe accident situation, this containment monitoring guide remains applicable and takes priority over all the other measures demanded in the severe accidents management guide. Detection of containment deficiencies is signalled by high activity measurements on the plant radiation monitoring systems (KRT). EDF states that it has put in place extensive prevention means that reduce the probability of SA situations occurring, and means to mitigate their impact on man and the environment. When the residual power can be removed from the reactor containment, releases into the environment are limited. In this case the releases come from potential leaks from the reactor containment. The reactor containment is described in § 1.1.2. This containment is designed to withstand 5 bars absolute pressure for all the plant series, and its resistance is verified every 10 years.
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