Isograph Reliability Software FaultTree+ V11 Summary of Fault and Event Tree Methods Illustrated Using the Current (V10.1) Facilities The FaultTree+ DLL

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


Summary of Fault and Event Tree Methods


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


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


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


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


I E

GATE22Q=5.491e-3


I E

GATE25Q=5.491e-3


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


Page 1

PCEP1

Electrical pumpunavailable

I E

r=2

I E

GATE20Q=2.083e-3


I E

GATE21Q=3.246e-3

Pump notoperating

PCNRV2


I E

r=0.5

I E

EC1100VQ=7.163e-4


Page 1

PCEV2


I E

r=0.5

I E

EC3300VQ=5.155e-4


Page 1

PCEP2


I E

r=2

I E

GATE23Q=2.083e-3


I E

GATE24Q=3.246e-3

Pump notoperating

PCNRV3


I E

r=0.5

I E

EC1100VQ=7.163e-4


Page 1

PCEV3


I E

r=0.5

I E

EC3300VQ=5.155e-4


Page 1

PCEP3


I E

r=2

I E

GATE26Q=2.083e-3


I E

GATE27Q=3.246e-3

Pump notoperating

PCNRV4


I E

r=0.5

I E

EC1100VQ=7.163e-4


Page 1

PCEV4


I E

r=0.5

I E

EC3300VQ=5.155e-4


Page 1

PCEP4


I E

r=2

I E

EC1100VQ=7.163e-4


I E

EC3300VQ=5.155e-4


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


I E

GATE57Q=2.139e-3


1

I E

GATE58Q=2.230e-1


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


Minor Release Enhancements – Are You Up to Date ?


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


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.


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.


New Features Scheduled for V11


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.


Library Facility

• Transfer data between library and project : – Fault trees

– Event trees

– Events

– CCF Models

– Generic Models

– Consequences

– Bitmaps

– Markov Models


Grid Filter


Grid Find and Replace


Generic Parameters


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


CCF Model Extension


CCF Model Extension


CCF Model Extension

MEANCCF QQ

CCFI QQQ

QQI

MAXCCF QQ .

MINCCF QQ .


IEC 61508-6 CCF Modelling






Hyperlinks


Sequential Analysis Extended

ALLOK

1 2 3

4 5 6 7 8 9

10 11 12 13 14 15


Sequential Analysis Extended

• Sequence data may be automatically assigned when creating Priority AND gates


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


Weibull Model

r tt

( )( )

1


Weibull Model


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


Batch and Partial Runs

• Batch Runs

• Partial Runs – On specific gate– On specific event tree– On specific consequence


Multiple Event Groups

• Easier Navigation

• Group importance rankings

• Disjoint event models


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


Links to IsoLib

• Generic data import– NPRD– IAEA– Electronic Parts

• Project Management– Restricted access– Audit trail


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


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


Miscellaneous

• Cut set lists in the results dialog may now be filtered with partial event names

• Modularisation options have been improved and simplified

Documents

Isograph Reliability Software FaultTree+ V11 Summary of Fault and Event Tree Methods Illustrated Using the Current (V10.1) Facilities The FaultTree+ DLL