Estimation of fission product source terms for the SGTR accident of a reference PWR plant using MELCOR and MAAP5

A steam generator tube rupture (SGTR) is a type of containment bypass accidents that if core damage not prevented during this accident progression, has the potential to lead significant release fission products (FPs) environment through faulted (SG) or other possible paths in secondary system. This paper presents best practice modeling approach more realistically quantify FP source terms expected an SGTR reference pressurized water reactor (PWR) plant, and also investigates impact dedicated mitigation actions on results interest established approach. To consider integral responses reactor, SGs, severe initiated by SGTR, detailed was performed for broad spectrum plant safety/mitigation systems relevant phenomena influencing evolution accident. As simulation tools analysis, MELCOR 2.2 MAAP5 were employed compare interest. The analysis demonstrate FPs into could be estimated as result it greatly decreased actions. Relevant insights are summarized particular points remaining uncertainty issues further study.