Currently, the Korean nuclear industry uses ZIRLO as material for nuclear fuel cladding(zirconium alloy). KEPCO Nuclear Fuel is in the process of developing a HANA alloy to enable domestic production of cladding. Cladding manufacture involves multistage heat treatments and pickling processes, the latter of which is vital for the removal of defects and impurities on the cladding surface. SMUT that forms on the cladding surface during such pickling process is a source of surface defects during heat treatment and post-treatment processes if not removed. This study analyzes ZIRLO, HANA-4, and HANA-6 alloy claddings to extensively study the SEM/EDS, XRD, and particle size characteristics of SMUT, which are second phase particles that are formed on the cladding surface during pickling processes. Using the analysis results, this study observes SMUT formation characteristics according to Nb concentration in Zr alloys during the washing process following the pickling process. In addition, this study observes SMUT removal characteristics on cladding surfaces according to concentrations of nitric acid and hydrofluoric acid in the acid solution.

Abstracts
1. 서 론
2. 실험방법
    2.1 재료 준비
    2.2 산세 실험
    2.3 특성 분석
3. 결과 및 고찰
    3.1 SMUT 생성 특성
    3.2 초음파 세척을 통한 SMUT 제거 특성
4. 결 론
References

• 문종한(한전원자력연료/충남대학교 신소재공학과) | Jong Han Moon (KEPCO Nuclear Fuel Company, Ltd./Graduate School of Department of Materials Science & Engineering, Chungnam National University)
• 이영준(지론텍) | Young Jun Lee (ZironTech Corporation)
• 이진행(한전원자력연료) | Jin Hang Lee (KEPCO Nuclear Fuel Company, Ltd.)
• 홍종원(한전원자력연료) | Jong Won Hong (KEPCO Nuclear Fuel Company, Ltd.)
• 이종현(지론텍/충남대학교 신소재공학과) | Jong Hyeon Lee (ZironTech Corporation, Republic of Korea/Graduate School of Department of Materials Science & Engineering, Chungnam National University) Corresponding author