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Regional Basic Professional Training Course in Korea

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❙ 607 ❙<br />

9. Probabilistic Safety Analysis<br />

rank important parts of risks. This is possible on the condition that users respect some key<br />

pr<strong>in</strong>ciples for us<strong>in</strong>g PSAs.<br />

9.6.3. Consequences for use - good practices<br />

They can be summarized by three recommendations<br />

Due to the limits of PSAs, they should not be used as a unique element to make a<br />

decision, rather they should be used as a complement to determ<strong>in</strong>istic rules or<br />

studies.<br />

Specific validation: It is impossible to use experimentation or real feedback to<br />

validate the results. The results have to be debated between several people, with<br />

different competencies (probabilistic and determ<strong>in</strong>istic, process and material).<br />

Review is a good practice.<br />

Critical comments: Any result has to be commented and criticized, based on global<br />

understand<strong>in</strong>g of PSA events and dependencies, and based on particular<br />

understand<strong>in</strong>g of process, functions, components, human actions and organization.<br />

9.6.4. Use of PSA for safety analysis<br />

9.6.4.1. Introduction<br />

Exist<strong>in</strong>g plants have ma<strong>in</strong>ly been designed on the basis of determ<strong>in</strong>istic rules only,<br />

<strong>in</strong>clud<strong>in</strong>g the study of a restricted list of conventional accidents, and tak<strong>in</strong>g <strong>in</strong>to account<br />

marg<strong>in</strong>s <strong>in</strong>tended to cover both physical uncerta<strong>in</strong>ties and other, not forecasted or<br />

complex events.

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