TY - JOUR A2 - Mavko, Borut AU - Jaeger, Wadim AU - Sánchez Espinoza, Victor Hugo AU - Montero Mayorga, Francisco Javier AU - Queral, Cesar PY - 2013 DA - 2013/02/28 TI - Uncertainty and Sensitivity Studies with TRACE-SUSA and TRACE-DAKOTA by Means of Transient BFBT Data SP - 565246 VL - 2013 AB - In the present paper, an uncertainty and sensitivity study is performed for transient void fraction and pressure drop measurements. Two transients have been selected from the NUPEC BFBT database. The first one is a turbine trip without bypass and the second one is a trip of a recirculation pump. TRACE (version 5.0 patch 2) is used for the thermohydraulic study and SUSA and DAKOTA are used for the quantification of the model uncertainties and the evaluation of the sensitivities. As uncertain parameters geometrical values, hydraulic diameter, and wall roughness are considered while mass flow rate, power, pressure, and inlet subcooling (inlet temperature) are chosen as boundary and input conditions. Since these parameters change with time, it is expected that the importance of them on pressure drop and void fraction will change, too. The results show that the pressure drop is mostly sensitive to geometrical variations like the hydraulic diameter and the form loss coefficient of the spacer grid. For low void fractions, the parameter of the highest importance is the inlet temperature/subcooling while at higher void fraction the power is also of importance. SN - 1687-6075 UR - https://doi.org/10.1155/2013/565246 DO - 10.1155/2013/565246 JF - Science and Technology of Nuclear Installations PB - Hindawi Publishing Corporation KW - ER -