Identification of Time At Risk Periods of Significance to ALARP Justifications

摘要

Behind the simplicity of the ALARP Principle - which requires that all reasonably practicable risk reduction measures should be taken - lies a great deal of complexity. One of the difficult areas is Time At Risk, when risks are above the mean value for a period of time. In this paper, three methods are developed as an aid to the process of agreeing what constitutes a significant period of increased risk that may possibly be worthy of separate ALARP consideration.