Nuclear Engineering and Technology

  • 제53권4호
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  • Pages.1109-1118
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  • 2021
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Heat transfer characteristics of redan structure in large-scale test facility STELLA-2

  • 투고 : 2020.04.13
  • 심사 : 2020.09.12
  • 발행 : 2021.04.25
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초록

The construction of STELLA-2 facility is on-going to demonstrate the safety system of PGSFR and to provide comprehensive understanding of transient behavior under DBEs. Considering that most events are single-phase natural circulation flow with slow transient, STELLA-2 was designed with reduced-height of 1/5 length scale. The ratio of volume to surface area in the vessel can relatively increase resulting in excessive heat transfer. Therefore, a steady-state thermal-hydraulic analysis was performed and the effect of design change to reduce the heat transfer through redan was investigated. The heat transfer through single wall redan in STELLA-2 was 3% of the core power, comparable to 1% of the core power in PGSFR. By applying the insulated redan, about 70% of decrease effect was observed. The effect on transient behavior was also evaluated. The conclusion of this study was directly applied to the STELLA-2 design and the modified version is under construction.

키워드

과제정보

This work was supported by the National Research Foundation (NRF) of Korea grant funded by the Korea government (MSIT - No. 2012M2A8A2025635, MSIT - No. 2016M2B2B1944980, and MOE - No. 2018R1D1A1B07050341).

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