A Study on the Crystalline Boron Analysis in CRUD in Spent Fuel Cladding Using EPMA X-ray Images
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초록
Chalk River Unidentified Deposits (CRUDs) were collected from the Korean pressurized water reactor (PWR)plant (A, B, and C) where the axial offset anomaly (AOA) occurred. AOA, also known as a CRUD-inducedpower shift, is one of the key issues in maintaining stable PWR plant operations. CRUDs were sampledfrom spent nuclear fuel rods and analyzed using an electron probe micro-analyzer (EPMA). This paper describesthe characteristics of boron-deposits from the CRUDs sampled from twice-burnt assemblies from the KoreanPWR. The primary coolant of a PWR contains boron and lithium. It is known that boron deposition occursin a thick CRUD layer under substantial sub-cooled nucleate boiling (SNB). The results of this study aresummarized as follows. Boron was not found at the locations where the existence was confirmed in simulatedCRUDs, in other words, the cladding and CRUD boundaries. Nevertheless, we clearly observed the presenceof boron and confirmed that boron existed as a lump in crystalline form. In addition, the study confirmedthat CRUD existed in a crystal form with a unique size of about 10 μm.
Abstract
Chalk River Unidentified Deposits (CRUDs) were collected from the Korean pressurized water reactor (PWR)plant (A, B, and C) where the axial offset anomaly (AOA) occurred. AOA, also known as a CRUD-inducedpower shift, is one of the key issues in maintaining stable PWR plant operations. CRUDs were sampledfrom spent nuclear fuel rods and analyzed using an electron probe micro-analyzer (EPMA). This paper describesthe characteristics of boron-deposits from the CRUDs sampled from twice-burnt assemblies from the KoreanPWR. The primary coolant of a PWR contains boron and lithium. It is known that boron deposition occursin a thick CRUD layer under substantial sub-cooled nucleate boiling (SNB). The results of this study aresummarized as follows. Boron was not found at the locations where the existence was confirmed in simulatedCRUDs, in other words, the cladding and CRUD boundaries. Nevertheless, we clearly observed the presenceof boron and confirmed that boron existed as a lump in crystalline form. In addition, the study confirmedthat CRUD existed in a crystal form with a unique size of about 10 μm.
참고문헌 (16)
- E. Décossin, , Proc. International Conference on Water Chemistry of Nuclear Reactor Systems (2008)
- W. Y. Maeng, , Proc. International Conference on Water Chemistry of Nuclear Reactor Systems (2008)
- H. Bichsel, , Phys. Rev, 108, pp.1025~ (1957)[DOI]
- P. L. Frattini, "Ultrasonic fuel cleaning-EPRI technology for efficient removal of corrosionproducts from", Nuclear Energy International (2000)
- "G. P. Sabol", EPRI, ~, pp.EPRI Report, TR-108320 (1997)
- G. P. Sabol, , Proc. Fontevraud IV International Symposium, pp.1159~1172 (1998)
- J.A. Sawicki, , Proc. Axial Offset Anomaly (AOA) Science Workshop (2000)
- M. Foucault, , Proc.International Conference Water Chemistry in Nuclear Reactors Systems
- Y.-K. Kim, "Technology Development Resolve Axial Offset Anomaly (AOA)" (2006), Korea Nuclear Fuel Co., Ltd
- H. M. Kwon, , Proc. High burn up UO2 nuclear fuel performance Workshop (2004)
- W. A. Byers, , Proc. Int. Conf. on Water Chemistry of Nuclear Reactor Systems 2006 (2006)
- J. Chen, "AOA studies at Studsvik", Proc. Int. Conf. Water Chemistry of Nuclear reactor Systems (2006), Korean Atomic Energy Research Institute
- S. Uchidaa, , Nucl. Eng. Des., 241, pp.2398~ (2011)[DOI]
- H. Kato, "Ultra Cleaning Method and Device Therefor, US Patent Number 5,467,791", ~ (1995)
- J. Deshon, "Boron-induced Offset Anomaly (BOA) Risk Assessment Tool, Version 3.0", EPRI, ~ (2010)
- J. A. Sawicki, , J. Nucl. Mater, 374, pp.248~ (2008)