Investigation of two-phase natural circulation with the SMART-ITL facility for an integral type reactor

A two-phase natural circulation test using SMART integral test loop (SMART-ITL) was conducted to explore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically, the test examined the natural circulation in the primary loop under a stepwise coolant inventory lo...

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Bibliographic Details
Published in:Nuclear engineering and technology 2022, Vol.54 (3), p.826-833
Main Authors: Jeon, Byong Guk, Yun, Eunkoo, Bae, Hwang, Yang, Jin-Hwa, Ryu, Sung-Uk, Bang, Yun-Gon, Yi, Sung-Jae, Park, Hyun-Sik
Format: Article
Language:Korean
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Summary:A two-phase natural circulation test using SMART integral test loop (SMART-ITL) was conducted to explore thermo-hydraulic phenomena of two-phase natural circulation in the SMART reactor. Specifically, the test examined the natural circulation in the primary loop under a stepwise coolant inventory loss while keeping the core power constant at 5% of the scaled full power. Based on the test results, three flow regimes were observed: single-phase natural circulation (SPNC), two-phase natural circulation (TPNC), and boiler-condenser natural circulation (BCNC). The flow rate remained steady in the SPNC, slightly increased in the TPNC, and dropped abruptly and maintained in the BCNC. Using a natural circulation flow map, the natural circulation characteristic in the SMART-ITL was compared with those in pressurized water reactor simulators. In the SMART-ITL, a BCNC regime appeared instead of siphon condensation and reflux condensation regimes because of the use of once-through steam generators.
ISSN:1738-5733
2234-358X