View source for Auxiliary feedwater

{{More citation needed|date=March 2025}}

'''Auxiliary feedwater''' is a backup [[water]] supply system<ref>{{Cite web |title=TTC Simulator Auxiliary Feedwater System |url=https://www.nrc.gov/docs/ML1122/ML11223A232.pdf}}</ref><ref>{{Cite web |title=AUXILIARY FEEDWATER SYSTEM |url=https://www.nrc.gov/docs/ML1331/ML13310A679.pdf}}</ref> found in [[pressurized water reactor]] [[nuclear power plant]]s (PWRs). This system, sometimes known as emergency feedwater, can be used to cool the reactor, if normal feedwater to the [[steam generator (nuclear power)|steam generators]] fails to work. It works by pumping water to the steam generators from reserve tanks or a larger body of water (e.g. lake, river, or ocean) to remove [[decay heat]] from the [[nuclear reactor|reactor]] by dumping non-radioactive steam to atmosphere or using this steam to drive turbine driven auxiliary feedwater pump(s). The auxiliary feedwater system in PWRs are often equipped with ''motor driven'' aux feedwater pumps, and, as an additional measure, ''turbine driven'' aux feedwater pump that is driven not by electricity but by steam generated by decay heat removal from the normal secondary side steam circuit of the plant. The typical [[steam turbine]] used in the aux feedwater systems are the “solid wheel” or “water wheel” Terry Steam Turbines manufactured by the [[Curtiss-Wright|Curtiss-Wright Corporation]] in Summerville, SC.

In contrast to [[nuclear reactor safety system#emergency core cooling systems|emergency core cooling systems]] for [[loss-of-coolant accident]]s, the auxiliary feedwater system does not inject directly into the reactor core. Instead, it cools in an indirect manner by cooling the primary circuit with the reactor via the steam generators.

==References==
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[[Category:Nuclear power]]


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