To consolidate the more » majority of these activities under one organization and in one facility required RCRA permit and safety basis modifications. At the start of the acceleration effort, three separate facilities managed by multiple organizations characterized and handled the drums. Lessons learned as well as estimates of cost savings and schedule benefits are described. The challenges encountered and experience gained in achieving this acceleration provide valuable lessons that can be used by others in the waste industry. The Department of Energy's site at Hanford has significantly accelerated the characterization of transuranic (TRU) waste and its subsequent shipment to the Waste Isolation Pilot Plant (WIPP)-from a total of two shipments in fiscal year 2002 to twelve shipments per month. These results will be used to develop an efficient computational fluid dynamics model to assess the ability of different staging building designs to prevent the temperature of package components from exceeding specified limits. The box-package model reduced the computational resources by a factor of 3, but systematically predicted higher temperatures more » by around 1.1☌. Excluding radiation heat transfer systematically increased temperatures by around 1.5☌ but reduced computational resources by a factor of four. Calculations that excluded shelving predicted temperatures within 0.6☌ of simulations that included shelving and required one-fourth the computational resources. Steady state simulations predicted package temperatures that were within 0.1☌ of simulations that included transient effects and required only one-eighth the computational resources.
These models employed between 106 to 107 elements.
Simulations with each drum modeled separately were compared to simpler simulations with sets of four drums represented by an equivalent box-package. Computational models were constructed that included or excluded (a) shelving, (b) effects of unsteadiness, and (c) radiation heat transfer. Additionally, there is a forced ventilation system, lighting, and insulated walls.
The generic building contains 640 drum-packages containing heat-generating, radiological material supported on four racks that are eight levels tall. The objective of this work is to perform computational fluid dynamics simulations of a ventilated radiological-material-package staging building to determine the effect of including or excluding a variety of physical effects and computational methods on both the predicted package temperatures and required computational resources.
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