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Isograph Reliability Software
FaultTree+ V11
Summary of Fault and Event Tree MethodsIllustrated Using the Current (V10.1) Facilities
The FaultTree+ DLLMinor Release Enhancements
New Features Scheduled for V11Open Discussion –Requirements for V11
Isograph Reliability Software
Summary of Fault and Event Tree Methods
Isograph Reliability Software
Fault Tree Construction Steps
• Define system bounds• Identify TOP event(s)• Identify immediate causes using top-down
approach• Continue to identify immediate causes
through intermediate levels of complexity• Terminate roots of fault tree with basic
events
Isograph Reliability Software
Fault Tree Logic GatesSymbol Name Causal Relation Valid No of Inputs
OR Output event occurs if any one of the inputevents occurs
2
AND Output event occurs if all input eventsoccur
2
MAJORITYVOTE
Output event occurs if m of the input eventsoccur
3
EXCLUSIVEOR
Output event occurs if one but not both ofthe input events occurs
2
INHIBITGATE
Output event occurs if both input eventsoccur. One of the inputs represents aconditional event.
2
PRIORITYAND
Output event occurs if all input eventsoccur in sequential order from left to right.
2
NOT Output event occurs if the input event doesnot occur.
1
Isograph Reliability Software
Component Failure/Repair Models
• Repairable Components
• Non-repairable Components
• Non-repairable Components – Phase related hazard (Time at Risk)
• Hidden or Dormant Failures
• Failures on Demand, Operator Errors
Isograph Reliability Software
Minimal Cut Sets
• Combinations of component failures which cause TOP event
• Produced using Boolean algebra
Product Storage &Removal
Primary Cooling
Secondary Cooling
By-Product Removal
Electrical Systems
Quench Tank
Feed System
Quench System
FSMV1 FSMV2FSEV1FSEP1
FSNRV1
FSCON
FSPRV
FSTS
FSPS
FSNRV2
FSEP2FSEV2
FSALARM
Controller
Feed System
Emergency automatic shut downsignal source
Operator shut down signal source
SCEV1
SCNRV1
SCEV2
SCNRV2
SCEP1
SCEP2
SCEV3
SCNRV3SCEP3
SCFN1
SCFN2
SCFN3
SCFN4
SCFN5
SCFN6
Head Tank
SCHT
SCCT1
SCCT2
SCCT3
3 x 33%
SCLEG1
SCLEG2
SCLEG3
SCFAN1
SCFAN2
SCFAN3
3 legs installed
2 legs installed
3 fan systems installed
2 fan systems installed
ECGRIDECDGEN
Diesel Generator
ECT1
ECC1ECC2
3.3kV Board
PumpsECT3
ECC3
ECT2
ECT4
ECC4
1.1kV Board
Fans
Valves
D.C. Board
Battery
ECBATT
Controllers Alarms Sensors
ECT5
ECR1
ECC5
Instrumentation
ECC6
Normally closed circuit breaker
Normally open circuit breaker
Battery Installation
Diesel Generator Installation
PCEV1
PCNRV1
PCEV2
PCNRV2
PCEP1
PCEP2
PCEV3
PCNRV3PCEP3
Head Tank
PCHT
Local Commercial and Domestic Heating Systems
PCEV4
PCNRV4PCEP4
4 x 33%
4 legs installed
3 legs installed
2 legs installed
QSEV1
QSNRV1
QSEV2
QSNRV2
QSEP1
QSEP2
Quench System
QSTANK
I E
PCLOSSQ=7.167e-4
3
Loss of primarycooling
ECGRID. ECT2
I E
GATE16Q=5.491e-3
No flow throughleg 1
I E
GATE19Q=5.491e-3
No flow throughleg 2
I E
GATE22Q=5.491e-3
No flow throughleg 3
I E
GATE25Q=5.491e-3
No flow throughleg 4
I E
GATE17Q=2.083e-3
Electrical valveshut
I E
GATE18Q=3.246e-3
Pump notoperating
PCNRV1
Non-return valvestuck closed
I E
r=0.5
I E
EC1100VQ=7.163e-4
No supply from1.1kV board
Page 1
PCEV1
Electrical valvestuck closed
I E
r=0.5
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
Page 1
PCEP1
Electrical pumpunavailable
I E
r=2
I E
GATE20Q=2.083e-3
Electrical valveshut
I E
GATE21Q=3.246e-3
Pump notoperating
PCNRV2
Non-return valvestuck closed
I E
r=0.5
I E
EC1100VQ=7.163e-4
No supply from1.1kV board
Page 1
PCEV2
Electrical valvestuck closed
I E
r=0.5
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
Page 1
PCEP2
Electrical pumpunavailable
I E
r=2
I E
GATE23Q=2.083e-3
Electrical valveshut
I E
GATE24Q=3.246e-3
Pump notoperating
PCNRV3
Non-return valvestuck closed
I E
r=0.5
I E
EC1100VQ=7.163e-4
No supply from1.1kV board
Page 1
PCEV3
Electrical valvestuck closed
I E
r=0.5
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
Page 1
PCEP3
Electrical pumpunavailable
I E
r=2
I E
GATE26Q=2.083e-3
Electrical valveshut
I E
GATE27Q=3.246e-3
Pump notoperating
PCNRV4
Non-return valvestuck closed
I E
r=0.5
I E
EC1100VQ=7.163e-4
No supply from1.1kV board
Page 1
PCEV4
Electrical valvestuck closed
I E
r=0.5
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
Page 1
PCEP4
Electrical pumpunavailable
I E
r=2
I E
EC1100VQ=7.163e-4
No supply from1.1kV board
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
I E
GATE59
Routes from3.3kV board
broken
ECT3
Transformerfault
I E
r=1
ECC3
Contactbreaker fault
I E
r=0.25
ECT4
Transformerfault
I E
r=1 tau=0.25
ECC4
Contactbreaker fault
I E
r=0.25 tau=0.5
I E
GATE55Q=1.140e-3
No supply viacontect breaker
3
I E
GATE56Q=1.691e-1
No supply viacontact breaker
4
I E
EC3300VQ=5.155e-4
No supply from3.3kV board
I E
GATE57Q=2.139e-3
No supply viacontact breaker
1
I E
GATE58Q=2.230e-1
No supply viacontact breaker
2
ECGRID
Grid unavailable
I E
Q=0.001
ECT1
Transformerfault
I E
r=1
ECC1
Contact breakerfault
I E
r=0.25
ECDGEN
Dieselgenerator fault
I E
r=0.5 tau=0.25
ECT2
Transformerfault
I E
r=1 tau=0.25
ECC2
Contact breakerfault
I E
r=0.25 tau=0.5
No Release$10K
1.808
No Release$10K
0.000
No Release$50K
8.539e-4
No Release$50K
1.908e-1
No Release$50K
0.000
1 RM$100K
2.690e-2
1 RM$100K
1.185e-8
2 RM$100K
0.000
10 RM$10000K
8.793e-4
100 RM$10000K
9.279e-5
No Release$70K
9.011e-5
2 RM$1000K
2.839e-3
3 RM$1000K
1.220e-9
5 RM$1000K
0.000
Over-pressurisation
w=2.000
Feed system f ailsto shut down af terover-pressurisation
Q=1.519e-2
Quench systemfails to operate
on demand
Q=1.425e-2
Pressure reliefvalve stuck
closed
Q=9.545e-2
Loss ofprimarycooling
Q=7.167e-4
Loss ofsecondary
cooling
Q=1.330e-3
Consequence Frequency
2.030
Isograph Reliability Software
Minor Release Enhancements – Are You Up to Date ?
Isograph Reliability Software
Minor Release Enhancements
• FaultTree+ now responds to messages from the FaultTree+ developer’s DLL
• Hardware protection key facilities have been added
• The calculated parameter Q/T (Unavailability at system lifetime divided by system lifetime) has now been added to gate results and may be displayed in the fault tree diagram or in reports or in the summary results dialog. This parameter has been added to conform to standard ARP4761
Isograph Reliability Software
Minor Release Enhancements (cont)
• The BDD (Binary Decision Diagram) calculation method has been added to the program.
• 8 Custom notes fields have been added to the fault tree event, gate and generic model tables. The field captions may be customised by the user. The ‘Reveal Notes’ menu option has been extended so that the fault tree diagram may display any of the 8 custom fields as the mouse cursor move over gates and events in the diagram.
Isograph Reliability Software
Minor Release Enhancements (cont)
• Cut set order fields are now available for fault trees in the report generator and export facilities
• The fault tree module gate page ordering and filtering facility for printing has been enhanced to allow groups of gates to be moved at once. Also gates connected below a given gate may be selected in one action and moved as a group.
• Users may now specify the sort field for the grid control in the grid options dialog.
Isograph Reliability Software
New Features Scheduled for V11
Isograph Reliability Software
Multiple Project Append
• A new append function has been added to allow users to append data from a group of projects all in one go. If there is a conflict in data definition (e.g. a gate has the same name in two projects but different inputs) priority is given to the first project in the list. Users may define a list of projects to be appended and save this list in a special template file.
Isograph Reliability Software
Library Facility
• Transfer data between library and project : – Fault trees
– Event trees
– Events
– CCF Models
– Generic Models
– Consequences
– Bitmaps
– Markov Models
Isograph Reliability Software
Grid Filter
Isograph Reliability Software
Grid Find and Replace
Isograph Reliability Software
Generic Parameters
Isograph Reliability Software
CCF Model Extension
• CCF Models may now be assigned to events with different failure models and/or parameters.– Beta Factor Model– Multiple Greek Letter (MGL) Model– Alpha Factor Model– Beta Binomial Failure Rate (BFR) Model
Isograph Reliability Software
CCF Model Extension
Isograph Reliability Software
CCF Model Extension
Isograph Reliability Software
CCF Model Extension
MEANCCF QQ
CCFI QQQ
QQI
MAXCCF QQ .
MINCCF QQ .
Isograph Reliability Software
IEC 61508-6 CCF Modelling
Isograph Reliability Software
IEC 61508-6 CCF Modelling
Isograph Reliability Software
IEC 61508-6 CCF Modelling
Isograph Reliability Software
Hyperlinks
Isograph Reliability Software
Sequential Analysis Extended
ALLOK
1 2 3
4 5 6 7 8 9
10 11 12 13 14 15
Isograph Reliability Software
Sequential Analysis Extended
• Sequence data may be automatically assigned when creating Priority AND gates
Isograph Reliability Software
Confidence Analysis
• Upper and Lower Bounds• Log-Triangular and Log-Uniform Distributions• Numerical Integration and Display of General
System Distribution• Option to take 1 sample only for all events
assigned to a single generic model or parameter• Correlation Coefficients
Isograph Reliability Software
Weibull Model
r tt
( )( )
1
Isograph Reliability Software
Weibull Model
Isograph Reliability Software
Phased Analysis
2.5 8 22 8 1.5 .5 .5 4 1 2 15
Ground Time
Ground Time Flight Time
Cycle
Block Time
Ex Re
R H T
H = Holding Point R = Rotation Re = Retraction Ex = Extension T = Touch Down
= 0.83 hr = 0.71 hr = 0.69 hr = 0.25 hr
Mean Block Time Mean Cycle Time Mean Flight Time Mean Turn Around Time
[min]
Stan
dstil
l
Star
t Up
Tax
iing
Tak
e O
ff
Initi
al C
limb
Clim
b
Cru
ise
Des
cent
App
roac
h
Rol
l Out
Tax
iing
Isograph Reliability Software
Batch and Partial Runs
• Batch Runs
• Partial Runs – On specific gate– On specific event tree– On specific consequence
Isograph Reliability Software
Multiple Event Groups
• Easier Navigation
• Group importance rankings
• Disjoint event models
Isograph Reliability Software
Gate and Event Colour Coding
SYS2
LOSS OFCOOLING LEG
1
PUMP1
PUMP 1UNAVAILABLE
VALVE1
VALVE 1CLOSED
NRV1
NON-RETURNVALVE STUCK
CLOSED
r=0.05
ELECA
LOSS OFBOARD ASUPPLY
EP1
PUMP 1PRIMARYFAILURE
r=1
EVENT1
PlannedMaintenance
True
ELECB
LOSS OFSUPPLY TOBOARD B
EV1
VALVE 1STUCK
CLOSED
r=0.7
Isograph Reliability Software
Links to IsoLib
• Generic data import– NPRD– IAEA– Electronic Parts
• Project Management– Restricted access– Audit trail
Isograph Reliability Software
Miscellaneous
• Failure and Success Fussell-Vesely Importance in Reports
• Risk Cut Sets Added to Summary Dialog• Pause Analysis Operates Quickly• Diagram may now be sent to clipboard as a
colour or black and white metafile• Gates are ordered alphanumerically in tree
control
Isograph Reliability Software
Miscellaneous
• Users may optionally change event tree notation to true/false rather than failure/success
• Branch probability values may now be shown in the event tree diagram
• Optional check on whether each event tree enabler column summates to a probability of 1
• Results and table dialog may now be resized to full screen
Isograph Reliability Software
Miscellaneous
• Cut set lists in the results dialog may now be filtered with partial event names
• Modularisation options have been improved and simplified