Analysis on Damage Cause of Belt Eyes for Bypass Feedwater Isolation Valves of Daya Bay and Ling’ao NPPs

CHE Yinhui; GUAN Jianjun; LV Qunxian; YANG Xiaochuan

Mar. 2025

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CHE Yinhui, GUAN Jianjun, LV Qunxian, YANG Xiaochuan. Analysis on Damage Cause of Belt Eyes for Bypass Feedwater Isolation Valves of Daya Bay and Ling’ao NPPs[J]. Nuclear Power Engineering, 2012, 33(2): 132-134.

Citation:

CHE Yinhui, GUAN Jianjun, LV Qunxian, YANG Xiaochuan. Analysis on Damage Cause of Belt Eyes for Bypass Feedwater Isolation Valves of Daya Bay and Ling’ao NPPs[J]. Nuclear Power Engineering, 2012, 33(2): 132-134.

Citation:

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Analysis on Damage Cause of Belt Eyes for Bypass Feedwater Isolation Valves of Daya Bay and Ling’ao NPPs

1. China Nuclear Power Technology Research Institute, Co. Ltd., Shenzhen, Guangdong, 518026, China;
2. Daya Bay Nuclear Power Operation and Management Co. Ltd, Shenzhen, Guangdong, 518124, China

Received Date: 2011-03-08
Rev Recd Date: 2012-12-02

Available Online: 2025-03-08

Abstract

Abstract

When all of bypass feedwater isolation valves of Daya Bay and Ling’ao NPPs were inspected under disassembled condition,it was found that the belt eyes were damaged in various degrees.The analysis on macro appearance,chemical composition,metallographic,Scanning Electron Microscope and fluid mechanics simulation were carried out on the damaged belt eyes.The results show that the flow rate of belt eye is well above the manufacturer’s recommendation so that flow accelerated corrosion and cavitation erosion occur on the belt eyes.According to the damage causes of the belt eyes,corresponding corrective actions are proposed.
- NPPs,
- Isolation valve,
- Flow accelerated corrosion,
- Cavitation corrosion