Analysis of Data on Pipe Wall Thinning Phenomena by Fluid Flow in Pressurized Water Reactor Plant

Yamakami, Katsuhiko; Hirano, Shinro; Nakamura, Toshio; Kaino, E.

doi:10.1115/pvp2008-61791

Cited by 2 publications

(1 citation statement)

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“…For instance, FAC rate for 50 °C with pH 7.0 is nearly the same or rather larger than that of 150 °C with pH 9.2. This would mean that in PWR plant pipeline, FAC susceptibility in condensate demineralizer downstream with temperature around 30 to 50 °C and neutral pH at before pH agent injection point, where wall thickness inspection was not recommended or required in the past (EPRI, 1999, Yamakami, 2008, and deaerator upstream with temperature around 140 to 150 °C and alkaline pH about 9.2 in normal AVT (All Volatile Treatment) condition, known to have large potential of catastrophic pipe rupture (NISA, 2004), is comparable.…”

Section: Average Data In Terms Of Major Parametersmentioning

confidence: 99%

Development of flow-accelerated corrosion prediction method (1) Acquisition of basic experimental data including low temperature condition

Yoneda

Morita

Fujiwara

et al. 2016

Mechanical Engineering Journal

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A series of study is presented to develop a prediction method for pipe wall thinning in power plants in order to improve the maintenance management for piping system. As the first report, experiments for flow-accelerated corrosion (FAC) of carbon steel specimens were conducted and basic data were obtained, focusing on relatively low temperature condition. FAC rate is seen to decrease by lowering temperature and the trend curve tends to remains to keep considerable level in lower temperature around 50 °C. Obtained data would mean that FAC susceptibility of pipeline in condensate demineralizer downstream and deaerator upstream in PWR plants is comparable. In terms of pH, a large drop in FAC rate is seen around pH 9.0 as in previous studies, and its ratio of pH 9.2 to pH 7.0 is approximately 1/10. This ratio fairly agrees with iron solubility in each pH condition at 150 °C while it is smaller in lower temperature condition, which may require additional effect related to pH and temperature to be considered to evaluate the FAC rate. The effect of iron contents on FAC rate is confirmed by referring to saturation solubility of iron. It is suggested that FAC may occur even when the iron concentration in the bulk water is in saturation level, which should be considered in the modelling process for FAC prediction.

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Section: Average Data In Terms Of Major Parametersmentioning

confidence: 99%

Development of flow-accelerated corrosion prediction method (1) Acquisition of basic experimental data including low temperature condition

Yoneda

Morita

Fujiwara

et al. 2016

Mechanical Engineering Journal

View full text Add to dashboard Cite

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New Technical Knowledge to be Implemented to the Revision of Rules on Pipe Wall Thinning Management for PWR Plants

Hirai

Nakamura²,

Amano³

2013

Trans.JSME, Ser.B

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Rules for PWR plant pipe wall thinning management were formulated by the Japan Society of Mechanical Engineers in 2006. Since then thinning management of Japanese PWR plants has been carried out based on this rule.Pipe wall thinning phenomena to be dealt with in this rule have been identified in many piping components of power plants. New technical knowledge has been accumulated since the issuance of 2006 edition. We have formulated these knowledge and information about the thinning phenomena in PWR power plants. Given the history of application of this rule, we have to make our best effort to carry out a study of latest technical knowledge and implement them to the revision of rule and improve pipe wall thinning management. This paper summarizes the new technical knowledge and basis to be implemented to the revision of rules on pipe wall thinning management for PWR plants in Japan.

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Analysis of Data on Pipe Wall Thinning Phenomena by Fluid Flow in Pressurized Water Reactor Plant

Cited by 2 publications

References 0 publications

Development of flow-accelerated corrosion prediction method (1) Acquisition of basic experimental data including low temperature condition

Development of flow-accelerated corrosion prediction method (1) Acquisition of basic experimental data including low temperature condition

New Technical Knowledge to be Implemented to the Revision of Rules on Pipe Wall Thinning Management for PWR Plants

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