Analysis of CRUD Flake Applied to Abnormal High Beam Current by Shielded-EPMA
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초록
CRUD specimens, scraped from twice-burned fuel cladding in the Korean Nuclear Power Plant, wereanalyzed using Shielded-EPMA. The principal elements of the CRUD were identified as Ni and Fe,at an approximate ratio of 1.3 Ni/Fe. To investigate the morphology and composition of the puremetallic materials in the CRUD, coolant impurities must be removed. This can be accomplished byincreasing the EPMA current to an abnormally high intensity until the impurities are melted. Normally,EPMA applications are performed at conditions of 20 kV voltage and 20 nA current. But in our study,the applied current was increased up to 1200 nA, over time increments ranging from 5 to 30 seconds. This technique was performed by opening an adjustable aperture for the gun alignment. Results showedimpurities contained in the CRUD material disappeared and pure metal materials, e.g., Ni and Fe,remained. This method presents an innovative way to analyze CRUD.
Abstract
CRUD specimens, scraped from twice-burned fuel cladding in the Korean Nuclear Power Plant, wereanalyzed using Shielded-EPMA. The principal elements of the CRUD were identified as Ni and Fe,at an approximate ratio of 1.3 Ni/Fe. To investigate the morphology and composition of the puremetallic materials in the CRUD, coolant impurities must be removed. This can be accomplished byincreasing the EPMA current to an abnormally high intensity until the impurities are melted. Normally,EPMA applications are performed at conditions of 20 kV voltage and 20 nA current. But in our study,the applied current was increased up to 1200 nA, over time increments ranging from 5 to 30 seconds. This technique was performed by opening an adjustable aperture for the gun alignment. Results showedimpurities contained in the CRUD material disappeared and pure metal materials, e.g., Ni and Fe,remained. This method presents an innovative way to analyze CRUD.
참고문헌 (12)
- C. S. Olsen, , Nucl. Eng. Des, 89, pp.51~ (1985)
- D. L. Porter, "Chemical gradients in CRUD on BWR Reactor Fuel Elements, INL", CON-07-12474
- D. H. Lister, , Nucl. Technol, 140, pp.288~ (2002)
- W. A. Byers, , Proc. Int. Conf., Water Chemistry in Nuclear Reactors Systems Conference, pp.11~14 (2004)
- "Effects of CRUD Buildup and Boron Deposition on Power Distribution and Shutdown Margin", NRC Information Notice No. 97-85, ~ (1997)
- J. Deshon, , J. Min. Met. Mat. S, 63, pp.64~ (2011)
- J. Y. Yeon, , J. Nucl. Mater, 354, pp.163~ (2006)
- M. C. Song, , Ann. Nucl. Energy, 30, pp.1231~ (2003)
- J. Gardner, , Proc. Int. Conf., Water Chemistry in Nuclear Reactors Systems Conference (2004)
- M. hagiinuma, , Proc. JAIF Int. Conf., Water Chem. Nucl. Power Plants (1989)
- R. Brutsch, , HOTLAB Plenary Meeting (2004)
- M. C. Song, , Nucl. Eng. Des, 229, pp.101~ (2004)