Abstract: The causes of corrosion in fire water pipelines in nuclear power plants were systematically reviewed and analyzed. Based on the identified causes of pipeline corrosion, a chemical deoxidizer was selected as a corrosion inhibitor. Laboratory simulation tests were conducted to verify the corrosion inhibition effect of this inhibitor, and its usage safety was preliminarily evaluated. The results indicate that this corrosion inhibitor could effectively address the corrosion issue in fire water pipelines without promoting the growth of sulfate-reducing bacteria. The inhibitor was free from elements such as sulfur, nitrogen, phosphorus and chlorine, and posed no adverse effects on equipment or personnel safety during use. Additionally, the inhibitor met wastewater discharge standards and had no impact on the foaming performance of firefighting foam.