ERA guide for application of the Common Safety Methods ... - Europa

European Railway AgencyGuide for the application of the CSM Regulation [G 1] All the criteria in Article 4 (2) for assessing the significance of a change should be analysedby the proposer but the proposer could take the decision based on only one or some of thosecriteria.[G 2] Indeed, many safety-related changes, evaluated on basis of these criteria are likely to becategorised as non significant changes. But when looking at each change, it is importantthat all of the consecutive non significant changes "taken together" do not become asignificant change that requires the application of the CSM process.[G 3] When evaluating a set of several successive (non significant) changes, combinations of alltypes of changes made since the last safety acceptance need not be considered. Only thesafety related changes that contribute to a same hazard in the risk analyses need to betaken into account.[G 4] The reference point for evaluating the "sum of non significant changes" made to a systemalready in use is the latest date of the following (refer also to CASES 4 and 5 in Figure 2):(a) either the entry into force of the CSM;(b) or the last safety acceptance of the related system according to Article 7.By virtue of Article 2 (4), the CSM is not retrospective: refer to CASES 1 and 2 in Figure 2. Itdoes not require retrospective assessment of changes made prior to the CSM adoption. It isassumed that the proposer continues to apply the methods in place for risk assessment untilthose methods are superseded by the CSM.CASE 1ChangesC 1 C 2 C XtApplication of Processesin place before CSMCASE 2ChangesSafety AcceptanceC 1 C 2 C YtApplication of Processesin place before CSMCASE 3Start of the projectEvaluation of Changesusing CSMApplication of Processesin place before CSMSafety Acceptance(CSM have not be applied)tCASE 4Evaluation of Changes using CSMEntry into forceof CSMC 1 C 2 C NtCASE 5Evaluation of Changes vs. last Safety Acceptance using CSMSafety Acceptancevs. CSMC 1 C 2 C ZtFigure 2: Safety related changes vs. entry into force of CSM. Reference: ERA/GUI/01-2008/SAF Version: 1.1 Page 17 of 54File Name: Guide_for_Application_of_CSM_V1.1.docEuropean 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