Extreme straight wind

The extreme, normal (rather frequent) and frequent values for wind speed can be determined either from site monitoring data or the wind speed standards of the national building code. Data from monitoring typically cover at least 10 continuous years of annual extreme wind speed records. The type of wind speed recorded over time has to be specified (e.g. average, 10 min peak, 3 s gust, etc.) so that a proper gust factor can be defined in converting wind 

For hazard category 1 and 2 research reactors, the design basis wind can be evaluated on the basis of the selected probability of exceedance for the external event hazard according to the performance goal assigned to their safety class 1 and 2 structures, systems and components. For more sophisticated investigations and analysis, further guidance is provided in Ref. [22], 

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