BS IEC 61508-5 : 98 AMD 13783

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Definitions and abbreviations
Annexes
A Risk and safety integrity - general concepts
B ALARP and tolerable risk concepts
C Determination of safety integrity levels: a quantitative
    method
D Determination of safety integrity levels - A qualitative
    method: fisk graph
E Determination of safety integrity levels - A qualitative
    method: hazardous event severity matrix
F Bibliography
Figures
1 Overall framework of this standard
    A.1 Risk reduction: general concepts
    A.2 Risk and safety integrity concepts
    A.3 Allocation of safety requirements to the E/E/PE
          safety-related systems, other technology
          safety-related systems and external risk reduction
          facilities
    B.1 Tolerable risk and ALARP
    C.1 Safety integrity allocation: example for safety-
          related protection system
    D.1 Risk graph: general scheme
    D.2 Risk graph: example (illustrates general principles
          only)
    E.1 Hazardous event severity matrix: example
          (illustrates general principles only)
Tables
B.1 Risk classification of accidents
B.2 Interpretation of risk classes
D.1 Example data relating to example risk graph (figure D.2)

Gives information on the underlying concepts of risk and the relationship of risk to safety integrity, together with methods for enabling the safety integrity levels for the E/E/P safety-related systems, other technology safety-related systems and external risk reduction facilities to be determined.