Crevice chemistry estimation from bulk water chemistry
- Mitsubishi Heavy Industries, Ltd., Takasago (Japan). Takasago Research and Development Center
- Kansai Electric Power Co., Osaka (Japan)
- Mitsubishi Heavy Industries, Ltd., Kobe (Japan). Kobe Shipyard and Machinery Works
Since the first PWR plant in Japan started commercial operation in 1970, 22 plants are running in Japan as of the end of 1994. The main purpose of secondary water chemistry control is to minimize the corrosion possibility of the secondary system equipment, especially steam generators (SG). To achieve this objective, much effort has been concentrated on improving secondary water chemistry control. As a result of this effort, the recent secondary water chemistry in Japanese plants is well maintained in every stage of operation. However, to ensure and improve the reliability of SG, it is necessary to control crevice environments, which are located at tube/tube support plate intersections and under the sludge pile on the tube sheet. According to recent crevice monitoring examination results, the concentration behavior impurities in SG bulk water at the crevice is different for each species, and SG bulk water and crevice chemical compositions are not always equal. From these results, to control the crevice chemistry, improving bulk water chemistry control methods and a new type of molar ratio control index is needed. This paper introduces a brief summary of a recent crevice chemistry evaluation technique and bulk water chemistry control method, which is employed for crevice chemistry control, based on crevice monitoring examination results.
- OSTI ID:
- 409749
- Report Number(s):
- CONF-9510292-; ISBN 1-57570-008-4; TRN: 97:000751
- Resource Relation:
- Conference: Improving the understanding and control of corrosion on the secondary side of steam generators, Airlie, VA (United States), 9-13 Oct 1995; Other Information: PBD: 1996; Related Information: Is Part Of Control of corrosion on the secondary side of steam generators. Proceedings; Staehle, R.W. [ed.] [Univ. of Minnesota, Minneapolis, MN (United States)]; Gorman, J.A. [ed.] [Dominion Engineering, McLean, VA (United States)]; McIlree, A.R. [ed.] [Electric Power Research Inst., Palo Alto, CA (United States)]; PB: 814 p.
- Country of Publication:
- United States
- Language:
- English
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