Tank 241-C-106 thermal hydraulic analysis to establish the cooling liquid at a minimum level

This report presents the computer simulations used to evaluate whether tank 241-C-106 can be operated at new lower operating liquid levels without significant reduction in th heat removal capability of the tank ventilation system. It is concluded that if the tank is operated with the liquid level between 72 and 74 in. the evaporation of the tank will be similar to what it is for the current operating level of 75 to 79 in. Analyses predict that for both operating limits voids will form during the summer months and disappear during the winter months. The waste temperatures for both operating limits will be close to the same. Installation of a chiller can maintain the highest waste temperatures below the saturation temperature (i.e., no voids will form) year round provided 67% of the original pool surface area is maintained for evaporation