Life cycle cost and risk estimation of environmental management options Page: 3 of 10
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This paper includes a specific cost/risk study demonstrating the use of the SCM and SCM-R tools. The study
provides a life cycle cost/risk evaluation of the trade-offs of using long-term storage prior to treatment versus
treating with existing technologies and minimizing storage. The study is based on actual INEL waste stream data
and can be considered representative of the type of analysis that could be performed at any large DOE site.
However, since some of the assumptions used are hypothetical, this study is not intended to accurately reflect
current INEL plans. Rather, the study is meant to demonstrate a unique cost/risk analysis capability using realistic
The purpose of the study was to compare the magnitude of the costs and risks for long-term storage versus the
current planning basis. These options show the costs and risks associated with delaying treatment until new
technologies are available. The study also shows how both costs and risks can be evaluated in one analysis. The
remainder of this paper includes a description of the alternatives, assumptions, cost and risk results, and key study
Two alternatives were defined for this cost/risk study:
1. Base Case Scenario - The Base Case Scenario is comprised of the INEL BEMR treatment, storage, and
disposal configuration and the 1995 Mixed Waste Inventory Report (MWIR) waste stream data. The Base
Case scenario used a treatment schedule based on the STP.
The waste is retrieved from earthen-covered storage. Retrieval will be followed by receipt and inspection
of the waste at the Stored Waste Examination Pilot Plant (SWEPP), which includes an open, dump, and
sort module to determine which treatment the waste form will receive. Also included are pre-treatment
handling and storage. All necessary pre-treatment facilities are assumed to be in existence at the INEL;
therefore, no construction costs are included until the year 2025, when existing facilities are assumed to
become obsolete and new storage is constructed.
This case utilizes incineration followed by grouting for the particulates, sludges, and some of the debris.
However, most of the debris will be treated by first shredding the waste, which is then treated by thermal
desorption followed by grouting. Other solids and particulates will be treated by a polymer stabilization.
Disposal is assumed to take place in an onsite engineered disposal facility.
2. Delay Case Scenario - The Base Case Scenario was revised to show the effects of long-term pre-treatment
Treatment and disposal for this case are identical to the Base Case with the only change being that the
treatment and subsequent disposal occur fifty years later. The treatment and disposal facilities required for
the Delay Case are considered to be nonexistent and will require construction. However, no post-treatment
storage is required for this case since the treated waste goes directly to disposal.
In addition to pre-treatment storage, the waste will be overpacked as it is received and inspected based on
the assumption that current containers are not adequate to support another 50 years of storage. SCM does
not have an "overpack" module, however, in order to provide costs to adequately reflect the overpacking,
the receiving and certification module costs were artificially increased to account for the activity. After the
waste is retrieved (complete in the year 2015) and overpacked (complete in the year 2039), it is stored until
treatment is available in the year 2047.
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Shropshire, D. & Sherick, M. Life cycle cost and risk estimation of environmental management options, article, April 1, 1996; Idaho Falls, Idaho. (https://digital.library.unt.edu/ark:/67531/metadc667804/m1/3/: accessed April 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.