Transient Heat Transfer Analysis for SRS Radioactive Tank Operation.

摘要

Some of nuclear waste storage tanks at Savannah River Site (SRS) are 0.75 million-gallon, single-wall, Type-I tanks. The tank is a 75 ft diameter, flat-bottomed, cylindrical tank with a height of about 24.5 ft. The tank consists of a primary steel tank and secondary containment. The primary tank shell is made of 0.5-in thick carbon steel, and is constructed in accordance with Section VIII of the ASME Boiler Code for Unfired Pressure Vessels. The secondary containment is a 0.5- in thick, 80-ft diameter and 5-ft high steel pan. Inside the primary tank, there are cooling coils, a valve housing to control the coolant flow of the cooling coils, and 12 structural support columns internal to the tank as shown in Fig. 1. A total of 36 cooling coils are supported from the roof including two horizontal coils across the tank bottom, but only about 12 coils in Tank 11 are actually functional during normal operations. Each cooling coil is 2-in Sch. 40 carbon steel, and is made of seamless pipe. It is proposed to use a Submersible Mixer Pump (SMP) to suspend and mobilize the waste in typical type-I waste tanks for sludge removal operations.