Abstract:
Design improvements of recirculation SG is discussed based on different ageing degradation mechanisms around the heat transfer tube. The results indicate that the design improvement measurements, such as taking I-690 TT as the heat transfer tube materials, installing the blow down components, supporting the plate with broached quatrefoil or broached trefoil structures, installing V type anti vibration bar at U bend, and conducting all volatile treatment for feed water, can effectively avoid or mitigate the general ageing degradations for the recirculation SG.
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