Has the Operator correctly combined the probabilities of events listed in logic trees?
Where the Operator employs fault tree, event tree or some other form of logic tree analysis to assess the probability of an event, the Assessors should expect to see numerical or qualitative (as appropriate) estimates for the likelihood of the basic events appearing in the logic tree. The values assigned should be justified by reference to historical date wherever possible. Where values are assigned on the basis of subjective judgement, then the reasons for any assumptions made should be clearly explained.
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