Investigation of Loss of Coolant Accidents in Pressurised Water Reactors Using the 'Dynamic Best-estimate Safety Analysis' (DYBESA) Method for Considering Uncertainties in TRACE

摘要

Loss of coolant accident must take uncertainties with potentially strong effects on the accident sequence prediction into account. For example, uncertainties in computational model input parameters resulting from varying geometry and material data due to manufacturing tolerances or unavailable measurements should be considered. The uncertainties of physical models used by the software program are also significant. In this paper, use of the "Dynamic Best-Estimate Safety Analysis" (DYBESA) method to quantify the uncertainties in the TRACE thermal-hydraulic program is demonstrated. For demonstration purposes loss of coolant accidents with breaks of various types and sizes in a DN 700 reactor coolant pipe are used as an example Application.