EFcalc - Event/Fault Tree Calculator |
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Describes the event trees of the problem by listing which systems are failed/not-failed for each sequence of each event tree. First, a list of all of the top-level gates is made (these are the gates that appear in the top banner of any of the event trees), preceded by the total number of top-level gates. These gates should all be defined in the *.equ file. Associated with each top-level gate is a simple failure probability, which will be zero for most applications, and a downtime associated with that gate.
After the list of top-level gates, one or more event trees can be described. First, a line containing the number of sequences in the event tree, the event tree shortname (no special characters) and the event tree longname description (in quotes) is given. After that, one line for each sequence in that event tree is listed. A sequence is described by its consequence short name, then the list of top-level gates. If a sequence includes the failure of a top-level system, that is represented as just the gate short name. If a sequence includes the not-failing of that same system, that is represented by the gate short name preced by a minus sign.
Event tree sequences can also point to other event trees instead of consequences. This allows very large event trees to be broken up in to smaller trees (easier for other programs to display). An event tree that lists other event trees as consequences is called a master event tree. Event trees that it refers to are called slave trees. In a master tree, each consequence must be the name of the slave tree. If master trees refer to other master trees, the event trees must be listed in order from highest master to lowest slave.
The format of the *.etr file is as follows:
20
loop 0.0 0.25
loca 0.0 0.25
rt 0.003162 0.25
afw 0.009798 0.25
.
.
rhr 0.02324 0.25
hpr 0.05 0.25
4 summary "Summary of LOOP and LOCA"
RT -loop -loca
LOCA -loop loca
LOOP loop -loca
LPLA loop loca
19 RT "RT Event Tree"
okay -rt -afw -porvlift -porvrseat
okay -rt -afw -porvlift porvrseat -hpi -rcscool -rhr
moderate -rt -afw -porvlift porvrseat -hpi -rcscool rhr
okay -rt -afw -porvlift porvrseat -hpi rcscool -hpr
moderate -rt -afw -porvlift porvrseat -hpi rcscool hpr
moderate -rt -afw -porvlift porvrseat hpi
okay -rt -afw porvlift
okay -rt afw -mfw -porvlift2 -porvrseat
okay -rt afw -mfw -porvlift2 porvrseat -hpi -rcscool -rhr
moderate -rt afw -mfw -porvlift2 porvrseat -hpi -rcscool rhr
okay -rt afw -mfw -porvlift2 porvrseat -hpi rcscool -hpr
moderate -rt afw -mfw -porvlift2 porvrseat -hpi rcscool hpr
moderate -rt afw -mfw -porvlift2 porvrseat hpi
okay -rt afw -mfw porvlift2
okay -rt afw mfw -feedbleed -recovssc
okay -rt afw mfw -feedbleed recovssc -hpr
moderate -rt afw mfw -feedbleed recovssc hpr
moderate -rt afw mfw feedbleed
moderate rt
Oak Ridge National Laboratory, 2004