A-6001-400 (07/94) uEF256 DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. I WHC-EP-0865 EXECUTIVE SUMMARYSolid waste forecast volumes t o be generated o r received a t the U.S. Department of Energy Hanford Site over the next 30 years are described i n t h i s report. transurani dtransuranic-mixed (TRU TRUM) waste. Summary 1 eve1 information pertaining t o low-level waste (LLWT i s described i n Appendix B. Emphasis i s placed on LLMW and TRU TRUM waste because i t will require processing and storage a t Hanford SolTd Waste's Central Waste Complex (CWC) p r i o r t o final disposal. The LLW will generally be sent directly t o disposal. The volume data was collected from onsite and offsite waste generators who currently s h i p or plan t o s h i p solid waste t o the Hanford Site.The volumes described i n detail are low-level mixed waste (LLMW) andThe total baseline volume of LLMW and TRU TRUM waste expected t o be received a t the CWC over the next 30 years i s Torecasted t o be over 235,560 cubic meters. Based on ranges provided by the waste generators, this baseline volume could fluctuate between a minimum of 203,690 cubic meters and a maximum of 260,500 cubic meters. The range is primarily due t o uncertaint i e s associated w i t h the Tank Waste Remediation System (TWRS) program. Uncertainties include the retrieval of the long-length equipment, scheduling, and tank retrieval technologies. ..The data reported i n this document estab1ish.a starting p o i n t for solid I t i s recognized that forecast estimates w i 11 waste management and planning. vary as f a c i l i t y planning and missions are more clearly defined. However, the

The exact physical and chemical nature of 55 million gallons of radioactive toxic waste held in 177 underground waste tanks at the Hanford Site is not known with sufficient detail to support the safety, retrieval, and immobilization missions presented to Hanford. The purpose of this study is to estimate probability distributions for the inventory of each of 72 analytes in each of 177 tanks. This will enable uncertainty intervals to be calculated for inventories and should facilitate the safety, retrieval, and immobilization missions.The methodology presented in this paper is based on scientific principles, sound technical knowledge of the realities associated with the Hanford waste tanks, chemical analysis of samples from the tanks, historical data and other Hanford research. As a result of the processing histories, waste storage practices and historical records, some of the waste can be partitioned into more homogeneous subsets that can be identified to tanks and locations within tanks. Therefore, by using this we can maximize the information extracted from the relatively few samples we have for each tank, combining sample data information from similar tanks to generate a sample based estimate of the chemical and radionuclide concentrations of each of the many waste subsets. Then by multiplying the concentrations for a specific analyte (micrograms of the analyte per gram of waste, or microCuries of the analyte per gram of waste) by the density (grams per liter) by the volume in a tank (liters), we can get an estimate of the mass of a particular analyte (or radionuclide contribution) in each tank. This methodology does this in a probabilistic framework; thus using and generating probability distributions instead of single point estimate numbers.

A-6001-400 (07/94) uEF256 DISCLAIMERPortions of this document may be illegible in electronic image products. Images are produced from the best available original document. I WHC-EP-0865 EXECUTIVE SUMMARYSolid waste forecast volumes t o be generated o r received a t the U.S. Department of Energy Hanford Site over the next 30 years are described i n t h i s report. transurani dtransuranic-mixed (TRU TRUM) waste. Summary 1 eve1 information pertaining t o low-level waste (LLWT i s described i n Appendix B. Emphasis i s placed on LLMW and TRU TRUM waste because i t will require processing and storage a t Hanford SolTd Waste's Central Waste Complex (CWC) p r i o r t o final disposal. The LLW will generally be sent directly t o disposal. The volume data was collected from onsite and offsite waste generators who currently s h i p or plan t o s h i p solid waste t o the Hanford Site.The volumes described i n detail are low-level mixed waste (LLMW) andThe total baseline volume of LLMW and TRU TRUM waste expected t o be received a t the CWC over the next 30 years i s Torecasted t o be over 235,560 cubic meters. Based on ranges provided by the waste generators, this baseline volume could fluctuate between a minimum of 203,690 cubic meters and a maximum of 260,500 cubic meters. The range is primarily due t o uncertaint i e s associated w i t h the Tank Waste Remediation System (TWRS) program. Uncertainties include the retrieval of the long-length equipment, scheduling, and tank retrieval technologies. ..The data reported i n this document estab1ish.a starting p o i n t for solid I t i s recognized that forecast estimates w i 11 waste management and planning. vary as f a c i l i t y planning and missions are more clearly defined. However, the

No abstract

I This report was prepared as an-account of work sponsored by an-agency of the United States Government. Neither the,United States'Government nor any agency thereof, nor Battelle Memorial lnsiitute, nor any of their employees, makes any warranty, express or implied, or assumesany legal liabilitfor responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned _rights. Reference, herein to any specificcommercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute 'or imply its endorsement, recommendation, or favoring by :the United States. , ~ Government or any agency thereof, orBattelle Memorial Institute. The views and opinions of authors expressed herein'do not necessarily state or reflect those of the United States .G,o\rernment or any agency thereof.-'