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- W197408835 abstract "Nuclear power plants have been experiencing significant thinning of pipe walls from wet steam at least since 1962, when a leak occurred in an extraction line at Dresden Unit 2. Many plants have had valves and piping dow-stream of valves damaged by flashing water. However, it was not until Surry Unit 2 experienced a dramatic pipe rupture in December 1986 at the suction of a feedwater pump that thinning in high energy lnes carrying only liquid water attracted widespread attention, although a similar failure had occurred in a pipe on the discharge side of a heater drain pump at Trojan about 20 months earlier.Seven months after the Surry incident the Nuclear Regulatory Commission issued a bulletin (IEB 87-01) requiring utilities to report their programs to identify and control erosion-corrosion. The NRC also sent out a questionnaire to collect information on the secondary water chemistry of PWRS. Analysis of their responses indicates that not only is erosion-corrosion widespread but that there is need for an easy way to understand its causes in a particular plant, evaluate alternative actions for its correction and arrive at practical, cost-effective programs to control it. This paper suggests how to fill that need in ways thatmore » will stop or nearly stop the progress of wall thinning and provide convincing evidence that it has been arrested. Specifically, it identifies water chemistry changes as the most cost-effective way to arrest widespread erosion-corrosion.« less" @default.
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- W197408835 date "1988-01-01" @default.
- W197408835 modified "2023-09-24" @default.
- W197408835 title "PWR secondary system pipe thinning" @default.
- W197408835 hasPublicationYear "1988" @default.
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