Predicting the impact of chromium on flow-accelerated corrosion
- Electric Power Research Inst., Palo Alto, CA (United States)
- Pacific Gas and Electric Co., Avila Beach, CA (United States)
- DuPage Computer Applications, Inc., Woodridge, IL (United States)
- Nuclear Research Inst., Rez (Czech Republic)
Flow-Accelerated Corrosion (FAC) continues to cause problems in nuclear and fossil power plants. Many experiments have been performed to understand the mechanism of FAC. For approximately twenty years, it has ben widely recognized that the presence of small amounts of chromium will reduce the rate of FAC. This effect was quantified in the eighties by research performed in France, Germany and the Netherlands. The results of this research has been incorporated into the computer-based tools used by utility engineers to deal with this issue. For some time, plant data from Diablo Canyon has suggested that the existing correlations relating the concentration of chromium to the rate of FAC are conservative. Laboratory examinations have supported this observation. It appears that the existing correlations fail to capture a change in mechanism from a FAC process with linear kinetics to a general corrosion process with parabolic kinetics. This change in mechanism occurs at a chromium level of approximately 0.1%, within the allowable alloy range of typical carbon steel (ASTM/ASME A106 Grade B) used in power piping in most domestic plants. It has been difficult to obtain plant data that has sufficient chromium to develop a new correlation. Data from Diablo Canyon and the Dukovany Power Plant in the Czech Republic will be used to develop a new chromium correlation for predicting FAC rate.
- OSTI ID:
- 404284
- Report Number(s):
- CONF-960706-; ISBN 0-7918-1785-7; TRN: 97:000432
- Resource Relation:
- Conference: American Society of Mechanical Engineers (ASME) pressure vessels and piping conference, Montreal (Canada), 21-26 Jul 1996; Other Information: PBD: 1996; Related Information: Is Part Of Pressure vessels and piping codes and standards: Volume 1. PVP-Volume 338; Esselman, T.C. [ed.] [Altran Corp., Boston, MA (United States)]; Adams, T.M. [ed.] [Stevenson and Associates, Cleveland, OH (United States)]; Bhavnani, D. [ed.] [Public Service Electric and Gas Co., Hancock`s Bridge, NJ (United States)]; Cofie, N.G. [ed.] [Structural Integrity Associates, Inc., San Jose, CA (United States)]; Jones, D.P. [ed.] [Westinghouse Electric Corp., West Mifflin, PA (United States)]; Olson, D.E. [ed.] [Sargent and Lundy, Chicago, IL (United States)]; Thailer, H.J. [ed.] [Pacific Gas and Electric Co., San Francisco, CA (United States)]; PB: 295 p.
- Country of Publication:
- United States
- Language:
- English
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