MELCOR Integral Severe Accident Analysis

MELCOR (Integral Severe Accident Analysis Code) Fast-Running, parametric models. 

The SARDB consists ofhundreds ofcalculationresults for significant core damage scenarios by using integrated severe accident analysis codes, for example, MAAP (FAl, 1994) or MELCOR (USNRC, 1990). It includes most of the high frequency accident sequences which are selected from the plant damage state event tree of a level 2 probabilistic safety analysis... 

The database information consists of the thermal-hydraulic/radiological variables of the core, reactor coolant system, containment system, and safety systems which are generated from integrated severe accident analysis code, such as MAAP or MELCOR program. 

Because some assessment is available for MELCOR in the areas of containment ther-mal/hydraulics and core damage assessment, calculations done at Sandia since the Peer Review concentrate on primary system thermal/hydraulic response, on fission product and aerosol release, transport and deposition, and on integral severe-accident analysis, areas where little or no MELCOR assessment was previously available. Completed and ongoing MELCOR assessment analyses at Sandia, whose results are summarized in this paper, include ... 

As part of the MELCOR Peer Review process [43], Sandia performed and presented a demonstration calculation of a Surry station blackout (TMLB ) accident with MELCOR. This was the first fully-integrated PWR severe acddent calculation performed with the code (since the TMI analysis only included in-vessel phenomena). 

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