Guidance for Use of CSM Recommendation - ERA - Europa

European Railway Agency
Collection of examples of risk assessments and of some possible tools
supporting the CSM Regulation
Global Risk Acceptance Criteria :
Societal Risk
Individual Risk;
etc.
Other RAC
RAC-TS
Risk Profile
Figure 9 : Pyramid of risk acceptance criteria (RAC).
[G 2] The explicit risk acceptance criteria that are needed to support the mutual recognition will be
harmonised between the Member States by the on-going Agency work on the risk acceptance
criteria. When available, additional information will be included in this document.
[G 3] In the meantime risks can be evaluated using for example the risk matrix that can be found in
section § 4.6 of the EN 50 126-1 standard {Ref. 8}. Other types of suitable criteria can also
be used, given that these criteria are deemed to deliver an acceptable level of safety in the
concerned case.
2.5.3. When the risk associated with one or a combination of several hazards is considered as
acceptable, the identified safety measures shall be registered in the hazard record.
[G 1] Additional explanation is not judged necessary.
2.5.4. Where hazards arise from failures of technical systems not covered by codes of practice
or the use of a reference system, the following risk acceptance criterion shall apply for
the design of the technical system:
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 10 -9 per operating hour.
[G 1] Further details about the RAC-TS, as well as what aspects and functions of the technical
system the criterion applies to, are provided in a separate Agency note associated to the
present document: see section A.3. of Appendix A and reference document {Ref. 11}.
Reference: ERA/GUI/02-2008/SAF Version: 1.1 Page 46 of 105
File Name: Collection_of_RA_Ex_and_some_tools_for_CSM_V1.1.doc
European Railway Agency ● Boulevard Harpignies, 160 ● BP 20392 ● F-59307 Valenciennes Cedex ● France ● Tel. +33 (0)3 27 09 65 00 ● Fax +33 (0)3 27 33 40 65 ● http://www.era.europa.eu