# Syetems Analysis of the CANDU-3 Reactor

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3) were analyzed using event trees as discussed in Chap. 3. The event tree branch points represent success or failure of systems designed to mitigate the initiator. Fault trees were used to model these systems to demonstrate how failure of the systems could occur. Many of the same systems would be used to mitigate different IEs and, therefore, are present in branch point calling for the FW function. In those cases where a specific system is needed, only the appropriate portion(s) of the fault tree would be called upon in the event.

In addition, two trim valves are installed at each steam genexator. The main FW pump motors and lube oil coolers are cooled by the recirculated cooling water system, and backup c_Joling is provided by the firewater system. 5 h, the three main level control valves will fail closed, lt was asstmaed that the valves receive power from the Class H Group I buses. 9 shows the FWI The AFW pump can discharge4% of normal feedwater flow into the two sw,mn generators. The pump is diesel driven and is started within 30 s of loss of feedwater flow.

8(a)-(i) shows the FV,"fault tree model, are loss-of-coolaut fault, coolant flow path fault, and loss of pumping function. Each steam generator has two valves (in parallel) that isolate tic FW2 from the steam generator. lt is assumed that there is sufficient flow to the steam generator _ one of the two isolation valves are open. 1 also assumed that the isolation valves receive power from Class II Group 2 buses. A flow diagram for FW2 is pre- Group 1 Feedwater System The FWI suppfies controlled feedwater flow to maintain required steam generator levels.

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