Preparation of Event Trees

Five events are selected after referring to event trees used for BWRs [39, 41]. 

The mitigation systems and actions for the Super LWR are selected by reference to LWRs. They are summarized in Table 6.25. The functions of these systems and actions can be categorized into several groups. 

The event trees for the Super LWR are prepared using the initiating events and the mitigation systems and actions described above. A core damage sequence (CD) is assumed if one of the following conditions is satisfied. 

Function Mitigation system or action Abbreviation in PSA Symbol in text figtnes 

Core cooling Reactor coolant pumps (both turbine-driven and motor-driven) RCP R 

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