DOE-HDBK-1017/2-93Brittle FractureHEATUP AND COOLDOWN RATE LIMITSSummaryThe important information in this chapter is summarized below.Heatup-Cooldown Rate Limits SummaryHeatup and cooldown rate limits are based upon impact on the future fatigue lifeof the plant. The heatup and cooldown rate limits ensure that the plant's fatiguelife is equal to or greater than the plant's operational life.Large components such as flanges, reactor vessel head, and the vessel itself are thelimiting components.Usually exceeding the heatup or cooldown rate limits requires only an assessmentof the impact on the future fatigue life of the plant.Soak times:May be required when heating large componentsUsed to minimize thermal stresses by controlling the heating rateBecome very significant if system is at room temperature or below andvery close to RTNDT temperature limitationsRev. 0Page 13MS-04
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