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With the development of scaling analysis approach, the reduced height test facility, such as APEX and PUMA in US, and ATLAS in Korea, have been successfully used for the NPP safety test. In this paper, the distortion originated from the reduced height effect is analyzed for the long term cooling phase based on the Natural Circulation. First, based on the NC scaling performed at a loop level and a component level, it shows the pressure drop through a specific component is scaled down, which could change the fluid property especially during the long term cooling phase for its low atmospheric pressure. Then, the scaling analysis of long term cooling loop is performed by cutting the loop into the three control volume sections, and it shows the reduced height will change the pressure at the core, which causes the fluid property slightly bias from the similitude condition and is conservative for the test result.

ICONE19-43123 Reduced Height Effect on the PWR's Integral Test Facility during Long Term Cooling