Physical Modelling of the in-Vessel Phases of Severe Reactor Accidents: The MELPROG/TRAC Computer Code

摘要

The MELPROG/TRAC computer code is the USNRC's bes-estimate model for analysis of phenomena in the rector vessel and reactor coolant system associated with the progression of severe accidents in light water reactors. Although versions exist for both boiling water reactors and pressurized water reactors, we confine our discussion herein to the pressurized water reactor. The structure of MELPROG/TRAC will be briefly summarized, its capabilities will be outlined, and results from typical analyses will be noted. As a specific example, differences in the initiation phase of a station blackout accident caused by pump seal failures will be described. finally, the experimental and analytical efforts to assess the modelling basis for MELPROG/TRAC will be outlined. (ERA citation 13:030371)