Auxiliary feedwater

Auxiliary Feedwater (AFW) is a system in a nuclear power plant that supplies water to the steam generator in case of a loss of the normal feedwater. The AFW system is designed to ensure the continuous removal of heat from the reactor core during all operational states and accident conditions.

Function

The primary function of the AFW system is to provide water to the steam generators for removing heat from the reactor core during a loss of normal feedwater. This is crucial in preventing a core meltdown, which could lead to a catastrophic release of radioactive material.

Components

The AFW system typically consists of several components, including pumps, valves, and piping. The pumps are used to deliver water to the steam generators, while the valves control the flow of water. The piping carries the water from the pumps to the steam generators.

Operation

In normal operation, the AFW system is in standby mode. When a loss of normal feedwater occurs, the AFW system is automatically activated. The pumps start to deliver water to the steam generators, and the valves open to allow the flow of water. The water is heated in the steam generators and then returned to the reactor core, where it absorbs heat and cools the core.

Safety

The AFW system is a critical safety system in a nuclear power plant. It is designed to be highly reliable and to function under all operational states and accident conditions. The system is regularly tested and maintained to ensure its readiness in case of an emergency.

See also

• Nuclear power plant
• Steam generator (nuclear power)
• Reactor core
• Core meltdown