Operating temperature information was gathered using thermocouples installed on the outside of an existing high pressure feedwater heater (FWH). The operating data was collected to demonstrate the basis for the evaluation of the operational effectiveness of the heater especially during rapid load changes. This information provides insight into the selection of shell side design temperatures of the skirt and shell sections of a feedwater heater. This direct measurement of the temperature was useful in evaluating the appropriateness of both skirt and shell design temperatures selected by standard HEI practice. Also, consideration will be given to upgraded turbines and their impact on the design temperatures and pressures of existing FWH(s).

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