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Common Safety Method (version a)

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Sam Wong

on 6 August 2013

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Transcript of Common Safety Method (version a)

Common Safety Method
Risk Management Framework
in the CSM Regulation
Risk Acceptance Principle
from EN 50126
by Sam Wong
System Lifecycle - covers the total life of a system
Information of CSM extracted from:
EN 50126
Who should know the CSM?
Purpose of the CSM
CSM shall be applied when ...
To understand Common Safety Method, we can begin with the
Risk Management Framework
1. Is there a significant change?
2. Define the System
3a. Identify the hazard
3b. Classify the hazard
3c. Is it a broadly acceptable risk?
If broadly acceptable, just record the hazard in an appropriate hazard record
If not, select a
Risk Acceptance Principle
Codes of Practice shall be applied when they are:
A Reference System is a system that:
This could happen when the System is:
entirely new

there are deviations from a Code of Practice or Reference System
Explicit Risk Estimation
can be
Quantitative or
Qualitative or
depending on the information provided.
The acceptability can be:
For example, for technical systems where a functional failure has credible
direct potential
for a
catastrophic consequence
, the associated risk does not have to be reduced further if the rate of that failure is less than or equal to
10E-9 per operating hour
If the risks of the System are covered by the Reference System:
6. Implement the
Safety Measures
7. With the
Safety Measures
in place, can the System
demonstrate compliance
with the
Safety Requirements
Either re-define the System
Or re-select the Risk Acceptance Principle
Independent Assessment is on-going throughout the whole process
There are hazard records that contain information of every step taken
Purpose of this presentation:
To learn
Common Safety Method (CSM)
Try to compare with
Supplementary Information ...
Thank You!
Hazard Identification in these Areas:
Notified national safety rules / technical rules

e.g. Railway Group Standards (RGSs), which are publicly available and widely acknowledged in the UK railway industry
Think about this:
Are PSD and APG similar reference systems?
After selecting the
Risk Acceptance Principle
identify possible
Safety Measures
which shall become the
Safety Requirements
5. Compare selected
Risk Acceptance Principle
with the
The selected
Risk Acceptance Principle
must contain
Safety Measures

cover the risks associated with the hazards of the System
Similar processes exist both in CSM and EN50126
Despite the processes that look similar, what are their differences?
Major Difference is found in the
Risk Acceptance Principle
Implicit Risk Estimation
Codes of Practice
Reference System
Explicit Risk Estimation
Qualitative and/or quantitative approach
Examples like:
To summarize, the

1) Significant Change?
2) System Definition
3) Hazard Identification
4) Selection of
Risk Acceptance Principle
i) Code of Practice
ii) Similar Ref. Sys.
iii) Explicit Risk Estimation
5) Identify Safety Requirements
6) Implement Safety Measures
7) Demonstration of Compliance
Have anyone heard of
Common Safety Method
Do you know what it is about?
All new guided transport systems must offer a level of risk globally at least as good as the one offered by any equivalent existing system.
Hazards due to a new transport system would not significantly augment the present fatality rate.
1) Both CSM and EN50126 involves Risk Management processes

2) They have similar processes in the
Risk Management Framework of CSM
System Lifecycle of EN50126

3) They differ in the way to interpret the
Risk Acceptance Principles

To Conclude
Full transcript