ML21278A182

2 to Updated Final Safety Analysis Report, Chapter 6, Section 6.1, General

ML21278A182
Person / Time
Site:	Calvert Cliffs
Issue date:	09/07/2021
From:	Exelon Generation Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML21278A102	List: ML21257A249 ML21257A253 ML21257A254 ML21257A255 ML21257A256 ML21257A258 ML21257A259 ML21257A260 ML21257A261 ML21257A262 ML21257A263 ML21257A264 ML21257A265 ML21257A267 ML21257A268 ML21257A269 ML21257A278 ML21257A281 ML21257A282 ML21257A283 ML21257A284 ML21257A285 ML21257A286 ML21257A287 ML21257A288 ML21257A289 ML21257A298 ML21257A299 ML21257A300 ML21257A301 ML21257A302 ML21257A303 ML21257A304 ML21257A305 ML21257A306 ML21278A106 ML21278A107 ML21278A108 ML21278A109 ML21278A110 ML21278A111 ML21278A112 ML21278A113 ML21278A114 ML21278A115 ML21278A116 ML21278A117 ML21278A118 ML21278A122 ML21278A123 ... further results
References
NEI 99-04
Download: ML21278A182 (1)

Text

ENGINEERED SAFETY FEATURES 6.1 GENERAL Several systems in Calvert Cliffs Units 1 and 2 are designated engineered safety features (ESF). The function of these systems is to localize, control, terminate, and otherwise mitigate the consequences of an accident and thereby enhance the protection of the public and plant personnel against the accidental release of fission products.

The systems function to cool the core, limit the magnitude and duration of a pressure transient within containment following a loss-of-coolant accident (LOCA), provide long-term post-accident cooling, and reduce the airborne radioactivity concentration in containment.

The systems defined as ESF are as follows:

a. The Safety Injection (SI) System [including as subsystems the safety injection tanks (SITs), high-pressure safety injection (HPSI) pumps and low-pressure safety injection (LPSI) pumps]:

The SI system injects borated water into the Reactor Coolant System (RCS). The system supplies emergency core cooling to limit fuel rod damage and fission product release, and ensure adequate shutdown margin regardless of temperature. The injection system also supplies continuous long-term post-accident cooling of the core by recirculation of borated water from the containment sump. Portions of the SI system may be used to provide long-term cooling flush;

b. Containment cooling systems:

1. The Containment Spray System:

Removes heat by spraying cool, borated water through the containment atmosphere. Heat is transferred to the Component Cooling System through the shutdown cooling heat exchangers;

2. The Containment Air Recirculation and Cooling System:

Removes heat by circulating the post-accident containment atmosphere over coils cooled by service water (SRW);

c. Containment Penetration Room Ventilation System:

Operation of the penetration room exhaust system ensures that radioactive materials discharging from the containment atmosphere following a LOCA are filtered prior to reaching the environment. High efficiency particulate and charcoal filters remove radioactivity associated with aerosols and the radioiodines;

d. Containment Iodine Removal System:

Recycles the post-accident containment atmosphere through charcoal filters to remove radioiodines.

The essential supporting systems include the control systems, the normal and emergency power systems and the component cooling, SRW and saltwater systems. These systems are described in Chapters 7, 8 and 9, respectively.

CALVERT CLIFFS UFSAR 6.1-1 Rev. 49