Safety & reliability of software-controlled systems. Part 7: Risk & safety

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1 Safety & reliability of software-cotrolled systems Part 7: Ris & safety Prof. Dr.-Ig. Stefa Kowalewsi Chair Iformati 11, Embedded Software Laboratory RWTH ache Uiversity Summer term 2014

2 Remider: Termiology Safety: The property of a situatio i which the ris of operatig/usig a system does ot exceed the limit ris. Ris: measure comprisig the probability of a evet leadig to damage the expected amout of damage if the evet occurs If quatificatio is possible: R = P damage damage Part 7: Ris & safety, Slide 2

3 Remider: Termiology R = P damage damage Part 7: Ris & safety, Slide 3

4 Damage to life/health of people to the eviromet to property Part 7: Ris & safety, Slide 4

5 Limit ris = biggest justifiable ris What determies justifiability? 1. Idividual ad social perceptio of ris Part 7: Ris & safety, Slide 5

6 Limit ris = biggest justifiable ris What determies justifiability? 2. Legal ad social orms Part 7: Ris & safety, Slide 6

7 Compare the followig defiitios Barbacci et al., SEI: Safety is the o-occurece of catastrophic cosequeces of the system s behavior o the eviromet Leveso, MIT: Safety is freedom from damage. Part 7: Ris & safety, Slide 7

8 Ris reductio (1) Ofte, operatig a aed system without ay safetyrelated additios is above the limit ris: Part 7: Ris & safety, Slide 8

9 Ris reductio (2) For a large class of systems, ris reductio ca be achieved by protective devices. Examples? Part 7: Ris & safety, Slide 9

10 Ris cceptace Priciples Priciples to fid out acceptable riss: MEM (Germay) GMB (Frace) LRP (Great Britai) Part 7: Ris & safety, Slide 10

11 MEM MEM: Miimale Edogee Mortalität (Miimum Edogeous Mortality) Bacgroud of MEM: Various age-depedet death rates i society portio of each death rate is caused by techological systems The age-depedet ris to die for such a reaso is called Edogeous Mortality R I well-developed coutries R is miimal for the group of the 5 to 15 year-olds Miimum Edogeous Mortality: R m = 2 x 10-4 death/perso x year Part 7: Ris & safety, Slide 11

12 acceptable idividual ris MEM Rule: sigificat icrease of R m caused by a ew techical system is ot acceptable Sigificat meas: 5% of R m : 10-5 death/perso x year Taig ito accout the umber of deaths: Itroduce differetial ris aversio (DR) 1,E-02 1,E-03 1,E-04 1,E-05 1,E-06 1,E-07 1,E-08 1,E-09 R m 1,E-10 1,E+0 1,E+1 1,E+2 1,E+3 1,E+4 1,E+5 1,E+6 umber of deaths Part 7: Ris & safety, Slide 12

13 GMB GMB: Globalemet u Mois ussi Bo (Globally at least as good) ssumptio: There already exists a comparable system Requiremet: The ew system shall i total be at least equally good. Trade-off possible: Worseig oe ris while overcompesatig by decreasig aother ris Part 7: Ris & safety, Slide 13

14 Icreasig ris LRP LRP: s Low s Reasoably Practicable Uacceptable Regio Ris caot be justified (except i exceptioal circumstaces). Tolerable Regio Ris is oly acceptable if the ris caot be decreased or if the costs are out of proportio to the improvemet. Broadly cceptable Regio Ris is isigificat. Part 7: Ris & safety, Slide 14

15 LRP bove upper limit Uacceptable ris No commissioig if ris reductio impossible Tolerable regio Showig that ris is withi tolerable regio is ot sufficiet Fid level where it is ot worth the cost to reduce further How to defie the upper ad lower limit? Part 7: Ris & safety, Slide 15

16 Example: Qualitative Ris ssessmet Class frequet probable occasioal rare improbable icoceivable Frequecy of Hazard Defiitio Will occur frequetly. Hazard is costatly preset. Will occur several times. Hazard is expected to occur ofte. Ca occur several times. Hazard is expected to occur several times. Ca occur sometimes durig life cycle. It maes sese to tae the hazard ito accout. The occurrece is improbable, but possible. Hazard is expected to occur i exceptioal cases oly. The occurrece is a very rare case. It may be accepted that the hazard will ot occur. Part 7: Ris & safety, Slide 16

17 Example: Qualitative Ris ssessmet Class Catastrophic Critical Margial Isigificat mout of Damage Cosequeces for People or Eviromet Fatalities ad/or several ijured persos ad/or serious damage to the eviromet Sigle fatality ad/or ijured perso ad/or cosiderable damage to the eviromet Small ijury ad/or cosiderable threat to eviromet Potetial, mior ijury Part 7: Ris & safety, Slide 17

18 Probability Example: Qualitative Ris ssessmet Oly acceptable if ris reductio impossible Ris Level frequet uwated itolerable itolerable itolerable probable tolerable uwated itolerable itolerable occasioal tolerable uwated uwated itolerable rare egligible tolerable uwated uwated improbable egligible egligible tolerable tolerable icoceivable egligible egligible egligible egligible isigificat margial critical catastrophic mout of Damage Must be excluded cceptable cceptable whe implemetig suitable precautio Part 7: Ris & safety, Slide 18

19 Fuctio of protective ad moitorig devices i process automatio Part 7: Ris & safety, Slide 19

20 ctive ad passive failures Protective devices have two mai fuctios: 1. Brig system to a safe state if dager arises. 2. Do othig if o dager is preset. We have to distiguish betwee 1. Failure to fulfil fuctio Failure to fulfil fuctio 2. Part 7: Ris & safety, Slide 20

21 Possible M-o-o-N evets critical evet protectio is ecessary o critical evet o protectio ecessary protectio activated No failure but failure of overall system active failure but failure of overall system o protectio activated passive failure but failure of overall system No failure o failure of overall system Part 7: Ris & safety, Slide 21

22 ew loo at redudacy structures Redudace i protective devices m-oo-: m systems must agree that the system has to be shut dow Two ids of availabilities: 1. Safety-related availability s : Probability that the system will be shut dow i case of a dagerous fault 2. Operatio-related availability o : Probability that the system will ot be shut dow uecessarily Part 7: Ris & safety, Slide 22

23 Part 7: Ris & safety, Slide 23 Safety-related availability vs operatio-related availability s s m s moo ) (1, o o m o moo ) (1 1,

24 Coflictig Goals Qualities ted to coflict with each other! e.g. Safety Reliability Costs Performace Part 7: Ris & safety, Slide 24

25 Reliability vs. Safety Reliability Safety Overlappig but ot idetical Part 7: Ris & safety, Slide 25

26 s ad o for homogeous redudacy: example Part 7: Ris & safety, Slide 26

27 vailability for passive failures _moo,s m 1 0, , , , , , , , , , , , , , , , , , , , , moo, s s (1 s ) m Part 7: Ris & safety, Slide 27

28 vailability for passive failures _moo,o m 1 0, , , , , , , , , , , , , , , , , , , , , moo, o o (1 o ) m1 Part 7: Ris & safety, Slide 28

29 Part 7: Ris & safety, Slide 29 Optimizatio for passive ad active failures s s m s moo ) (1, o o m o moo ) (1 1, ) ( ) (1 ) ( ) (,,,, max arg m m m m o s o s ) (,, m s moo s ) (,, m o moo o o o m s s m m m o s ) (1 ) (1 ) (1 ) ( 1,, max arg

30 Cosequeces IF Example for α =0.5: s is importat: high o is importat: low m 1 m both are importat: 0.5 m 2 (If s = o) Part 7: Ris & safety, Slide 30

31 Safety-related system / compoet requiremets (1) Fail-safe: Property of a system to remai i or move to a safe state i case of a failure Example: Trai braes eed eergy to be released. If power supply is iterrupted, they brae. Part 7: Ris & safety, Slide 31

32 Safety-related system / compoet requiremets (2) Fail-silet: Property of a subsystem to remai i or move to a state i which it does ot affect the other subsystems i case of a failure Silece = safe state of the subsystem Examples: Faulty bus user (couterexample: Babblig Idiot i Ca Bus) Faulty SW process i a soud operatig system Part 7: Ris & safety, Slide 32

33 Safety-related system / compoet requiremets (3) Fail-operatioal: Property of a system to eep up its fuctio or a degraded mode of fuctioality i case of a fault Example: ir plae cotroller Fault-tolerat Part 7: Ris & safety, Slide 33

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