Document Control Sheet Title : Risk Evaluation Criteria

date of last update-distribution level-Disclaimer The information contained in this report is subject to change without notice and should not be construed as a commitment by any members of the SAFEDOR Consortium or the authors. In the event of any software or algorithms being described in this report, the SAFEDOR Consortium assumes no responsibility for the use or inability to use any of its software or algorithms. The information is provided without any warranty of any kind and the SAFEDOR Consortium expressly disclaims all implied warranties, including but not limited to the implied warranties of merchantability and fitness for a particular use. Executive summary: This report discusses various risk evaluation criteria with relevance to shipping and ship design. In particular, risk acceptance criteria for safety and environmental damage are considered. The report contains a review of existing criteria and discusses current practice within IMO. In addition, new proposals are presented in areas where risk evaluation criteria have not been commonly used, e.g. in cost effectiveness criteria for risk control options related to environmental risk. The work with this deliverable started shortly after the SAFEDOR kick-off meeting in February 2005 and was completed September 30 th 2005. The report consists of three major chapters, chapter 2, 3 and 4. Chapter 2 contains a description of general principles on how risk evaluation criteria may be derived. Of particular relevance to risk based design and the work within SAFEDOR are the ALARP principle and the principle of equivalency. Various risk acceptance criteria are generally needed in order to assess an activity in terms of risk. First, limits for when the risk is intolerable should be established. It will also be useful to define a limit for when risks are regarded as negligible. Then, cost effectiveness criteria should be decided upon in order to evaluate whether risks are ALARP if in the ALARP area. The principles discussed in chapter 2 are applied to safety in chapter 3 and to accidental environmental releases in chapter 4. Chapter 3 largely relies on work done prior to SAFEDOR, and was reported in e.g. an INTERSHIP II-2 report in 2004 [1]. This part has only been subjects to some updates, accounting for recently published papers and results. The chapter discusses various risk acceptance criteria related to safety for individual risk and societal risk. The main focus is on fatality risk, but also the risk of non-fatal injuries and …