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<?xml version="1.0"?>
<!--
This input contains groupings for common cause analysis for Three Train system.
CCF is represented with alpha factor that assigns factors for exact failures.
-->
<opsa-mef>
<define-fault-tree name="AlphaFactorCCF">
<define-gate name="TopEvent">
<and>
<event name="TrainOne"/>
<event name="TrainTwo"/>
<event name="TrainThree"/>
</and>
</define-gate>
<define-gate name="TrainOne">
<or>
<event name="ValveOne"/>
<event name="PumpOne"/>
</or>
</define-gate>
<define-gate name="TrainTwo">
<or>
<event name="ValveTwo"/>
<event name="PumpTwo"/>
</or>
</define-gate>
<define-gate name="TrainThree">
<or>
<event name="ValveThree"/>
<event name="PumpThree"/>
</or>
</define-gate>
</define-fault-tree>
<define-CCF-group name="Pumps" model="alpha-factor">
<members>
<basic-event name="PumpOne"/>
<basic-event name="PumpTwo"/>
<basic-event name="PumpThree"/>
</members>
<distribution>
<float value="0.1"/>
</distribution>
<factors>
<factor level="1">
<float value="0.7"/>
</factor>
<factor level="2">
<float value="0.2"/>
</factor>
<factor level="3">
<float value="0.1"/>
</factor>
</factors>
</define-CCF-group>
<define-CCF-group name="Valves" model="alpha-factor">
<members>
<basic-event name="ValveOne"/>
<basic-event name="ValveTwo"/>
<basic-event name="ValveThree"/>
</members>
<distribution>
<float value="0.1"/>
</distribution>
<factors>
<factor level="1">
<float value="0.7"/>
</factor>
<factor level="2">
<float value="0.2"/>
</factor>
<factor level="3">
<float value="0.1"/>
</factor>
</factors>
</define-CCF-group>
</opsa-mef>
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