PRESCON2 predictions of Point Lepreau containment events

PRESCON2 code was originally developed to predict containment peak pressure for large LOCA accidents. Further enhancements were added to increase its capability to predict long term containment thermal hydraulic behaviour. Recently, additional models for containment subsystems are incorporated in PRESCON2 that enabled the code to simulate low pressurization transients. These models with improved solution methodology extended the code performance for the range of events with extremely small discharges into containment. Further improvement in the methodology for using PRESCON2 resulted in the capability to simulate steady state initial condition for different states of ventilation system resulting in different initial reactor building conditions. To prove and validate the use of new methodology of code use and the new models, PRESCON2 is used to predict three events which occurred at the Point Lepreau generating station. The following paper provides a comparison of pressures predicted by PRESCON2 against measurement made at the station. (author)