1 - Alaska Energy Data Inventory

Once the design volumes were establ ished, rejection and demand runswere performed on IIMSLlRGE II for the 11.0 and 12.2 ft tunnel schemes. Thecritical condition for load rejection is maximum pool (1,022 ft), tailwaterelevation at 11.4 ft, minimum hydraulic losses, initial turbine output of47,191 horsepower (blocked output, 1.0 power factor) and full gate closurein 3.5 s. This condition is indicated as "Rejection Condition All onPlate B26. Rejection conditions "B" and "C", shown on Plates B26 and B27,are similar to condition "AII except that pool elevations are 960 ft and 880ft respectively.These graphs are shown to illustrate that condition "A"results in the greatest hydraulic gradient at the tank.The criticalcondition for load demand is that condition where the water surfaceelevation in the tank reaches its minimum. This condition occurs atminimum pool(820 ft), tailwater at 11.4 ft, maximum hydraul ic losses,initial turbine output of 0 hpfully opened in a governor time of 5 s.(wicket gates. closed), and wicket gatesThis results in a turbine outputof 40,825 hp after quiescent conditions are achieved. The "DemandCondition" is indicated on Plate B25.B4-14