Emergency Feedwater Systems


Function

The Emergency Feedwater System in pressurized nuclear power plants may also be named Auxiliary Feedwater. The purpose of this system is to continue supplying enough makeup water to the steam generator to continue removing heat from the reactor after the reactor has been shutdown. When the reactor is shutdown the feedwater pumps are not normally used. No credit is taken for the normal feedwater pumps during accident and transient analyses because the assumption is made that their power source, a non-safety system, is unavailable.

Major Components

Major system components include:

Sample System Diagram

A typical Auxiliary Feedwater System flow diagram is illustrated below:

 


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