Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Design of type 316L stainless steel 700 ℃ high-temperature piping

  • Received : 2023.03.08
  • Accepted : 2023.06.13
  • Published : 2023.10.25
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Abstract

High-temperature design evaluations were conducted on Type 316L stainless steel piping for a 700 ℃ large-capacity thermal energy storage verification test loop (TESET) under construction at KAERI. The hot leg piping with sodium coolant at 700 ℃ connects the main components of the loop heater, hot storage tank, and air-to-sodium heat exchanger. Currently, 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, the design material properties around 700 ℃ are not available in those rules. Therefore, a number of material tests, including creep tests at various temperatures, were conducted to determine the insufficient material properties and relevant design coefficients so that high-temperature design on the 700 ℃ piping may be possible. It was shown that Type 316L stainless steel can be used in a 700 ℃ high-temperature piping system of Generation IV reactor systems or a renewable energy systems, such as thermal energy storage systems, for a limited operation time.

Keywords

Acknowledgement

This work was supported by the National Research Council of Science & Technology (NST) grant (CAP-20-03-KAERI) and NRF grants (2021M2D1A 1084836, 2021R1l1A2057941 and 2021K1A3A1A78097845) funded by the Korean government (MSIT).

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