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BSI PD 7974-7:2019+A1:2021

BSI PD 7974-7:2019+A1:2021

$198.66

Application of fire safety engineering principles to the design of buildings – Probabilistic risk assessment

Published By Publication Date Number of Pages
BSI 2021 54
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This Published Document provides guidance on probabilistic risk analysis in support of BS 7974. It sets out the situations in which a probabilistic risk assessment can add value to traditional deterministic analyses and outlines acceptance criteria for the assessment. Furthermore, common analysis techniques of probabilistic risk assessment are summarily discussed.

This Published Document also includes data for probabilistic risk assessment based on fire statistics, building characteristics and reliability of fire protection systems.

This Published Document does not contain guidance on techniques for hazard identification or qualitative risk analysis.

PDF Catalog

PDF Pages PDF Title
4 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
9 4 Design approach
11 Figure 1 — Flowchart for demonstrating adequate safety of a design
12 Figure 2 — General flowchart for design assessment using PRA methods
14 Figure 3 — Consolidated flowchart for a design through PRA
15 5 Acceptance criteria
Figure 4 — One-dimensional representation of generalized consequence-frequency (FC)
17 Figure 5 — Generalized consequence-frequency (FC) diagram with indication of tolerability limit and negligible limit
18 Figure 6 — Flowchart to determine the applicable PRA acceptance criteria for demonstrating adequate safety
19 Figure 7 — FN diagram (cumulative exceedance frequency versus number of casualties)
29 6 Analysis methods
Table 1 — Summary of discussed methods and main characteristics
32 Figure 8 — Event tree analysis
Figure 9 — Fault tree analysis
38 Figure 10 — Example of typical uncertainty distribution
39 Figure 11 — Example of Tornado Chart Showing Contribution to Variance
40 7 Data collection for PRA
41 Annex A (informative)  Acceptance and tolerability criteria
Table A.1 — Individual risk limits
Table A.2 — Parameters and valuation of benchmark proportionality constant SCCR1life
Annex B (informative)  Indicative probabilities
42 Table B.3 — Overall probability of fire starting in various types of occupancy
Table B.4 — Fire growth rate distributions
43 Table B.5 — Fire load energy density for various types of occupancy
Table B.6 — System effectiveness
44 Table B.7 — Extent of Damage in USA Fire Incidents, 1989-1994
45 Annex C (informative)  Commentary on acceptance criteria
Figure C.1 — Acceptability criteria
50 Bibliography

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BSI PD 7974-7:2019+A1:2021
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