Document: NUREG-0800
Document ID: e6b7e6d3-a99d-424d-bfa0-491bc48f46cf
Document Type: srp
Title: ISOLATION CONDENSER SYSTEM (BWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0708/ML070810517.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.4.13
CFR Part: 
CFR Title: 

Content:
d cooldown of the remaining units. The ICS provides DHR capability after the reactor is shut down and isolated. The reactor water cleanup/shutdown cooling (RWCU/SDC) system and other engineered safety features (ADS, passive containment cooling system (PCCS), and GDCS) back up the ICS. The ICS should be designed so that the ability to accomplish these safety-related functions is not compromised for each unit regardless of equipment failures or other events that may occur in another unit. Meeting the requirements of GDC 5 provides assurance that the unacceptable effects of equipment failures or other events occurring in one unit of a multiunit site will not propagate to the unaffected unit(s). 4. GDC 17 establishes requirements for providing onsite and offsite electric power systems to permit functioning of SSCs important to safety to ensure their safety function assuming either power system is not functioning. The safety function for each electric power system is to provide sufficient capacity and capability to assure that (1) specified acceptable fuel design limits and design conditions of the reactor coolant pressure boundary are not exceeded as a result of anticipated operational occurrences and (2) the core is cooled and containment integrity and other vital functions are maintained in the event of postulated accidents. The ICS is a safety system and must therefore be able to meet its safety function in the event of postulated accidents and with a single failure. 5. GDC 33 specifies requirements for a system to supply reactor coolant makeup for protection against small breaks in the reactor coolant pressure boundary and be designed to assure safety function performance with either onsite or offsite alternating current (ac) power not available. The ICS is designed as a limited high-pressure reactor coolant makeup system with flow rates sufficient to meet the criteria for small breaks in the reactor coolant pressure boundary without ac power. The RWCU/SDC system