(17c) Applying the 'Limitation of Effects' ISP Strategy when Siting and Designing Facilities

Minimize, Substitute, Moderate, and Simplify are four primary Inherently Safer Processing (ISP) strategies. The 'Moderate' methodology, in turn, primarily 'Attenuation', a strategy that emphasizes the use of materials under less hazardous conditions. 'Limitation of Effects' and 'Knock-on Effects' are also ISP terms bantered about. Most often, each is presented as a sub-set of the 'Moderate' ISP strategy, although at times they are presented as separate, unique ISP strategies. Irregardless of their taxonomy, the application of such strategies can significantly lower overall process risk. This paper discusses the author's understanding of the meaning of the terms 'Limitation of Effects' and 'Knock-on Effects' and presents examples of the application of these strategies to the siting of plants, processes, and buildings.