Nuclear Exelon Generation Company

This section describes the design bases, system design, performance evaluation, testing, and inspection requirements for the emergency core cooling system (ECCS). The related subject of containment cooling is addressed in Section 6.2.2. All LOCA PCT evaluations performed are reported to the NRC per 10 CFR 50.46. The UFSAR is marked up for updates within 90 days of the submittal. The 10 CFR 50.46 letter is on file at the site. Between UFSAR updates the latest PCT is tracked by Nuclear Fuel Management or the cognizant equivalent. 6.3.1 Introduction and System Design Bases The ECCS is designed to provide adequate core cooling across the entire spectrum of line break accidents. It consists of the core spray (CS) subsystem, the low pressure injection (LPCI) subsystem, the high pressure coolant injection(HPCI) subsystem, and the automatic depressurization (ADS) subsystem. The individual subsystems are described in Section