Life cycle cost and risk estimation of environmental management options Page: 4 of 10
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" The specific waste management system defined for this study was the INEL alpha MLLW. For the sake of
simplicity in modeling the INEL alpha MLLW, the initial risk analysis was limited to five waste matrix
categories2. The total alpha MLLW inventory at the INEL is characterized by 12 waste matrix codes.
However, the five waste codes chosen for this demonstration model represent 97.7% of the volume of
waste to be treated at the INEL. The five waste codes chosen for this model are: S 3110, S 3120, S 5110,
S 5300, and S 5400.
" The costs reflect DOE-built and operated facilities required for the alpha MLLW inventory. Since
treatment facilities for this waste do not currently exist at the INEL, new facilities will be required. The
alpha MLLW will be treated based on the requirements of the Resource Conservation and Recovery Act.
The treatment window for the inventory is assumed to be 19 years in duration (same for both cases).
" These cases assume that the alpha MLLW inventory is disposed of onsite in an above-ground engineered
Scheduling Assumptions for the Base Case
" For the Base case, all construction of treatment facilities starts in 1996, with treatment to commence in
1999. The SCM was allowed to build all treatment required.
Scheduling Assumptions for the Delav Case
" Retrieval of the waste will occur over 19 years. After the waste is retrieved, it is received, inspected and
assayed at the SWEPP facility over a 19-year duration that ends in 2017. As the waste is assayed it is
overpacked and then placed in storage. Overpacking operations will be complete in 2039. Existing
storage capacity for the retrieved and overpacked waste is not sufficient, so SCM will be allowed to
construct storage facilities as required.
" Waste storage continues until 2065. SCM will construct new facilities and decontaminate and
decommission (D&D) the old facilities as required during the extended storage period.
" Construction (for three years) is followed by treatment, which commences in 2047 and completes in 2065.
Life cycle cost estimates were calculated for the two INEL alpha MLLW cases using the SCM and based on the
assumptions and case descriptions outlined above. The total life cycle cost for the Base Case was estimated to be
$1.25 billion (B), while the total life cycle cost for the Delay Case was estimated to be $2.79 B.
Figure 1 shows a comparison of the cumulative costs for the two cases over time. The Base Case includes higher
up-front costs because all needed treatment, storage, and disposal facilities are constructed immediately. However,
the cumulative costs for the Base Case level out after the last facility is decommissioned in the year 2024. Because
of the much longer operational time frame, the cumulative costs for the Delay Case surpass those for the Base Case
?Waste matrix categories, or codes, are defined in the DOE Waste Treatability Group Guidance (DOE/LLW-217, Rev. 0), January 1995,
which was issued to support development of the MWIR.
3 All cost estimates are in constant 1996 dollars.
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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/m1/4/: accessed April 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.