The study of cold leg thermal stratification in APEX-CE Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/765374645

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  • This research presents an analysis of thermal stratification in the reactor cold leg of the Advanced Plant Experiment-Combustion Engineering (APEX-CE). This phenomenon may be a precursor leading to a Pressurized Thermal Shock (PTS) event in a nuclear power plant. This work was performed in support of the U.S. Nuclear Regulatory Commission's (USNRC) re-evaluation of its PTS regulations. Using the APEX-CE test facility, thermal stratification was observed for injection flow rates ranging from 30% to 100% and natural circulation flow rates that were generated by core decay powers ranging from 1.5% to 4%, both relative to the scaled Palisades values. A theoretical model was derived to estimate the hot stream entrainment that occurs during cold leg thermal stratification. This model was applied to the Separate Effects Transparent Loop (SETL) facility, a scaled cold leg/downcomer configuration of the APEX-CE plant. The model predictions were in reasonable agreement with the High Pressure Injection (HPI) fluid entrainment data from the Purdue ½ scale facility. The same model was then used to estimate HPI entrainment in SETL. The results proved to be very consistent. Finally, data for the onset of loop seal spillover was obtained using SETL and APEX-CE. A useful flow map, characterizing the onset condition, was generated.
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