Probabilistic safety analysis for process plants generally only address accidents occurring during production operation (cf.[1],[2]). This is in contrast with the numerous start-ups and shut-down required in most chemical plants. For this reason an investigation is presented which covers all teh three operational phases mentioned. It was performed for a plant producing nitroglycol, a very powerful explosive. The presentation is limited to the production part, although other plant areas as, for example, storage were investigated as well [3].
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