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RELAP5/MOD2 simulation of ORNL reflood tests

Conference · · Trans. Am. Nucl. Soc.; (United States)
OSTI ID:7118620
Following the blowdown phase of a postulated loss-of-coolant accident in a pressurized water reactor (PWR), the reactor core is uncovered and the fuel rods experience rapid temperature excursions because of decay power production and low heat transfer. In order to prevent fuel from overheating, emergency core cooling is activated and the accident enters the reflood phase. Several experimental and analytical programs have been performed to investigate the reflooding phenomena. The purpose of this study is to simulate several reflooding tests performed at Oak Ridge National Laboratory in the Thermal-Hydraulic Test Facility (THTF) using the latest version of RELAP5/MOD2 (cycle 36.04) to assess its capabilities in predicting the reflood phenomena. The code has demonstrated the capability to predict experimental behavior; however, refinements in the interfacial drag are required to improve the code's predictions.
Research Organization:
Texas A and M Univ., College Station (USA)
OSTI ID:
7118620
Report Number(s):
CONF-8711195-
Conference Information:
Journal Name: Trans. Am. Nucl. Soc.; (United States) Journal Volume: 55
Country of Publication:
United States
Language:
English