* See glossary page 21 1 Safety improvements to the 1,300 MWe NPPs Containment ultimate cooling system This system evacuates heat from the reactor building in the event of a core melt accident, by circulating the water to be cooled through an exchanger by means of a pump. The fixed heat exchanger is itself cooled by river or sea water, by means of a mobile ultimate heat sink (immersed pump, motor, piping, etc.), brought in by the Rapid Response Nuclear Taskforce (FARN). 1 Containment Cooling water intake Hot water discharge Heat exchanger Pump Pump Pump motor PTR-bis* additional cooling system In the event of an accident with loss of the normal PTR spent fuel pool cooling system, the PTR-bis*, which consists of fixed parts but also mobile components brought in by the FARN, enables cooling of the pool to resume. 4 These new provisions are designed to function after an external hazard (earthquake, flood, tornado) of extreme intensity. Cooling water intake Hot water discharge Pump motor Spent fuel pool PTR-bis container Pump THE SAFETY ISSUES 14 • Les cahiers de l’ASN • January 2024
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