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In any case, in interpreting or adopting the results of accident management studies, attention needs be paid to the fact that there may be large uncertainties present. 6. ANALYSIS OF OPERATIONAL EVENTS Accident analysis is frequently used as a tool for a full understanding of events occurring during the operation of NPPs, as part of the feedback of operational experience. According to the IAEA’s Incident Reporting System, computer codes are used for analysis of about 10% of the events reported.

It is preferable to use best estimate computer codes and best estimate analyses for the corresponding accident analyses. For consistency, the accident analysis should use the same set of assumptions as were adopted in the framework of PSA. Nevertheless, for reducing the number of scenarios to be analysed and to simplify analyses, a bounding case approach is sometimes used. The risk from the plant can be overestimated by this approach and one must be cautious in using these results as the basis for EOPs and accident management.

The main focus of PSA is to provide realistic answers, so best estimate codes and data are normally used. However, the results of the supporting analysis may sometimes be ‘bounded’ by the results of deterministic or conservative analyses to show that equipment performance is satisfactory; such analysis is not to be used for designing EOPs. 5. TYPES OF ACCIDENT ANALYSIS The results of safety analysis are used in a number of different areas. For each use, this section sets the objective, explains the application, describes the relevant part of the project stage in which the results are used, summarizes typical assumptions and suggests the scope of the analysis.

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