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700℃ 고온 배관에 Type 316L 스테인리스강의 적용성 분석
이형연(Hyeong-Yeon Lee),남기언(Ki-Eun Nam),윤정(Jung Yoon),김현일(Hyeong-Il Kim),어재혁(Jahyuk Eoh) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
Elevated temperature design and evaluations on Type 316L stainless steel piping in a 700℃ large-capacity thermal energy storage verification test loop (TESET) under commissioning at KAERI have been conducted. The hot leg piping with sodium coolant of 700℃ connect the main components of loop heater, hot tank and air-to-sodium heat exchanger. The design rules of ASME B31.1 and RCC-MRx provide design procedures for high-temperature piping in the creep range for Type 316L stainless steel. However, many material properties needed for design evaluations are not available over the temperature of 550℃ to 700℃. A series of high-temperature material strength tests were conducted in this study, and other essential material properties from previous test works on low cycle fatigue tests and creep tests were used for the design evaluations. The lack of material properties and design coefficients was determined based on the material tests associated with high-temperature design on the 700℃ piping. It was shown that Type 316L stainless steel can be used for a limited time duration in a high-temperature piping system of the TESET test facility subjected to 700℃ coolant.