Document: NUREG-0800
Document ID: 2cb61281-91f4-400a-8eda-41e187e51d77
Document Type: srp
Title: AUXILIARY FEEDWATER SYSTEM (PWR)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070570007.pdf
Revision Date: 2023-06
Chapter: 10
Section ID: 10.4.9
CFR Part: 
CFR Title: 

Content:
gory I to remain functional following a Safe Shutdown Earthquake (SSE). RG 1.29 position C.2 states criteria for systems with continued functions not required following an SSE but the failure of which could affect the functioning of systems important to safety. The AFWS removes heat from the reactor coolant system via the steam generators during startup and shutdown under normal operations, and during emergency or accident conditions involving a loss of normal feedwater. In an SSE, systems not designed as seismic Category I (e.g., the main feedwater system) may be damaged severely. GDC 2 provides assurance that the AFWS will perform its safety function in an SSE. 2. GDC 2 requires that the design of structures, systems and components (SSCs) important to safety withstand the effects of tornadoes. RGs 1.76 and 1.117 identify the characteristics of a design bases tornado (DBT) and those SSCs that should be designed to remain functional following a DBT. The AFWS removes heat from the reactor coolant system via the steam generators during startup and shutdown under normal operations, and during emergency or accident conditions involving a loss of normal feedwater. In the event of a DBT, systems not designed to withstand these effects may be severely damaged. GDC 2 provides assurance that the AFWS will perform its safety function in the event of a DBT. 3. GDC 2 requires that the design of structures, systems and components (SSCs) important to safety withstand the effects of floods. RGs 1.59 and 1.102 identify the characteristics of a design basis flood (DBF) and those SSCs that should be designed to remain functional following a DBF. The AFWS removes heat from the reactor coolant system via the steam generators during startup and shutdown under normal operations, and during emergency or accident conditions involving a loss of normal feedwater. In the event of an DBF or internal flooding, systems not designed to withstand these effects may be severely damaged. GDC 2