Chemistry of Waterside Oxide Layers on Pressure Tubes / T. Do, M. Saidy, W. H. Hocking
- Conference Author:
- 15th International Symposium on Zirconium in the Nuclear Industry (15th : 2007 : Sunriver, OR)
- Physical Description:
- 1 online resource (19 pages) : illustrations, figures, tables
- Additional Creators:
- Saidy, M., Do, T., Hocking, W. H, American Society for Testing and Materials, and ASTM International
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- The pressure tubes that contain the fuel bundles and the primary coolant within the core of a CANDU heavy-water reactor are fabricated from a Zr-2.5Nb alloy with a complex microstructure. During reactor operation the pressure-tube interior surface is slowly oxidized by heavy water and a fraction of the deuterium that is released through this process enters the underlying alloy and can reduce its fracture toughness. Considerable variability in deuterium ingress has been observed among the pressure tubes within a single reactor as well as between different reactors. These differences are thought to be due not only to metallurgical variables, such as alloy microstructure and composition, but also to variations in the primary coolant chemistry, including pH and dissolved impurities. In the present study, a combination of surface analytical methods has been employed to characterize the microchemistry and oxidation history of the waterside oxide layers grown on two pressure tubes that were removed from different CANDU reactors. The presence of varying concentrations of iron, manganese and uranium, derived mainly from corrosion of feeder pipes and fuel failures, has been found throughout the oxide layers. An increase in the oxidation rate of one pressure tube later in life could be correlated with evidence of greater open porosity, provided by the depth distributions of impurities, extending deep within the oxide layer.
- Dates of Publication and/or Sequential Designation:
- Volume 2009, Issue 1505 (January 2009)
- 9780803180079 (e-ISBN), 9780803145146, and 0803145144
- Digital File Characteristics:
- text file PDF
- Bibliography Note:
- Includes bibliographical references 32.
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- Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription., Full text article also available for purchase., and Also available in PDF edition.
- Reproduction Note:
- Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 2009. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
- Technical Details:
- Mode of access: World Wide Web.
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- ASTM International PDF Purchase price USD25.
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