THERMAL PERFORMANCE UPGRADE OF THE ARKANSAS NUCLEAR ONE
COOLING TOWER: A "ROOT CAUSE" ANALYSIS APPROACH
GARY W. LIFFICK, P.E. AND JOHN W. COOPER, JR., P.E.
The thermal performance efficiency of the natural draft cooling tower at Entergy
Operations' 858 MWe Arkansas Nuclear One, Unit 2 was successfully upgraded to 101% of
design performance capability in April 1994 as the end result of a unique
"root-cause" analysis of the cooling tower's long-standing performance
deficiencies. Through application of state-of-the-art diagnostic testing methods and
computer modeling techniques, Entergy was able to identify and correct air/water
maldistribution problems in the 447 foot tall counterflow design at minimal cost. Entergy
estimates that the savings realized, as a result of the 1.2oF reduction in
cooling tower outlet water temperature, will pay for the thermal upgrade project in
approximately 18 months.