# Commission Implementing Regulation (EU) No 402/2013 of 30 April 2013 on the common safety method for risk evaluation and assessment and repealing Regulation (EC) No 352/2009 (Text with EEA relevance), Division 2.5.5: Where hazards arise as a result of failures of functions of a technical system, without prejudice to points 2.5.1 and 2.5.4, the following ... design targets shall apply to those failures:

Extent: E+W+S+N.I.

(a)where a failure has a credible potential to lead directly to a catastrophic accident, the associated risk does not have to be reduced further if the frequency of the failure of the function has been demonstrated to be highly improbable.
(b)where a failure has a credible potential to lead directly to a critical accident, the associated risk does not have to be reduced further if the frequency of the failure of the function has been demonstrated to be improbable.
The choice between catastrophic accident or critical accident shall result from the most credible unsafe consequence of the failure.

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Source: https://www.legislation.gov.uk/eur/2013/402/annex/I/division/2/division/2.5/division/2.5.5 (the official version)
Page: https://openlegislation.uk/eu-regulation-2013-402/annex-I/division-2/division-2.5/division-2.5.5
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.