Elevation of water table and various stratigraphic surfaces beneath E area low level waste disposal facility

Bagwell, L.; Bennett, Patti

doi:10.2172/1395255

Cited by 9 publications

(13 citation statements)

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“…Figure 4, reproduced from Bagwell and Bennett's report (Bagwell and Bennet 2017), illustrates this complexity as illustrated by the multiple hydrostratigraphic units beneath E-Area. Bagwell and Bennett (2017) provide elevations for all identified subsurface units beneath the corner coordinates of each E-Area DU footprint, from which the average distance above the water table for each hydrostratigraphic surface is derived and shown in Table 6. Note that for the 643-7E NRCDA the water table is above the Tan Clay Confining Zone (TCCZ) while for 643-26E the water table dips below it and therefore the distance is shown as zero.…”

Section: Stratigraphic Surfaces Beneath E-area Low Level Waste Facilitymentioning

confidence: 99%

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PORFLOW Implementation of Vadose Zone Conceptual Model for Naval Reactor Component Disposal Areas in the E-Area Low Level Waste Facility Performance Assessment

Hang

Hamm

2020

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Section: Stratigraphic Surfaces Beneath E-area Low Level Waste Facilitymentioning

confidence: 99%

“…Additional modeling geometries may be evaluated as potential sensitivity cases based on other stacking scenarios for SBDC's and partial filling of the disposal pad footprint. Bagwell and Bennett (2017)…”

Section: Model Domain Dimensionsmentioning

confidence: 99%

PORFLOW Implementation of Vadose Zone Conceptual Model for Naval Reactor Component Disposal Areas in the E-Area Low Level Waste Facility Performance Assessment

Hang

Hamm

2020

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“…PORFLOW three-dimensional vadose models of a centrally located slit and engineered trench were developed by Danielson (2019) using the depth to water table and hydrostratigraphic surfaces beneath Slit Trench 6 (Bagwell and Bennett, 2017). The upper boundary condition of the PORFLOW models is defined by time dependent infiltration rates to account for the operational period (uncovered), institutional control period (interim cover), the post-closure period (final cover -intact case, subsided cases and long-term degradation).…”

Section: Overview Of Vadose Zone Modelsmentioning

confidence: 99%

GoldSim E-Area Low-Level Waste Lacility Vadose Zone Model Benchmarking

Wohlwend¹,

Aleman²

2020

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This report documents the development and benchmarking of the E-Area Low-Level Waste Facility (ELLWF) GoldSim Engineered and Slit Trench (ET and ST) vadose zone models. Subsequent activities (beyond the scope of this effort) will couple the GoldSim-based vadose zone models to the GoldSim aquifer model, with the intent of performing stochastic analyses that couple all pertinent fate and transport processes from the ground surface up to the 100-m Point of Assessment (POA). The benchmarking presented within this report focuses on the Slit Trench 06 (ST06) hydrostratigraphic location that resides within the center set of slit trenches. These GoldSim-based vadose zone models are generic models capable of being benchmarked to any of the other trench locations within E-Area. This is a key component of the effort to include uncertainty quantification and sensitivity analysis (UQSA) in the next revision of the E-Area Performance Assessment (PA). This report describes the model and shows results obtained from benchmarking the GoldSim transport simulations under a deterministic mode (using nominal best estimate parameter settings) to best-estimate deterministic results obtained using the PORFLOW vadose zone model. The P PORFLOW model is three-dimensional while the GoldSim model represents a simplified one-dimensional treatment. The GoldSim ET and ST vadose zone models were able to reproduce PORFLOW peak fluxes, with acceptable accuracy for ET Case01 (Intact) and ST Case01 (Intact), as shown in Table ES-1 and Table ES-2, respectively. The GoldSim ET and ST vadose zone models were able to reproduce PORFLOW peak fluxes, with acceptable accuracy for ET Case11b (Subsided) and ST Case11b (Subsided), as shown in Table ES-3 and Table ES-4, respectively. The detailed comparison of radionuclide and tracer fluxes from the waste zone and to the water table are discussed in Section 5 and summarized in Section 6. Note that the parameter settings established are universal in nature and are independent of radionuclide and its progeny. The close agreement between the two models provides confidence that GoldSim will provide adequate results that will reflect the behavior of vadose zone transport under off-nominal operating conditions for sensitivity and uncertainty analysis. Table ES-1. Comparison of GoldSim and PORFLOW peak fluxes to the water table and peaks times ET Case01 (Intact).

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“…The cross-sectional material layout for the CIG unit model is shown in Figure 2-2. The hydrostratigraphic surfaces present around and beneath the CIG units are taken directly from Danielson (2019) and are based on the work of Bagwell and Bennett (2017). The thickness of grout surrounding the waste zone is 1-foot thick on all sides and the waste zone is 18 feet wide by 14 feet tall (excluding the grout encapsulating layer).…”

Section: Model Geometrymentioning

confidence: 99%

Component-In-Grout Model Implementation for the E-Area Low-Level Waste Facility's Performance Assessment

Danielson

2020

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The component-in-grout (CIG) disposal units are below grade earthen trenches that contain grout encapsulated waste components. Components disposed of within the CIG segments consist of large radioactively contaminated equipment and smaller waste forms (e.g., B-25 boxes and SeaLand containers) to fill the space around and above the large equipment. In the 2022 revision of the E-Area Low-Level Waste Facility's (ELLWF) performance assessment, groundwater radionuclide contaminant transport through the vadose zone will be modeled using the PORFLOW software package for nine existing CIG segments located within the Slit Trench (ST) 23 footprint-no additional CIG segments are planned for at this time. The nine CIG segments have been placed within two of the nominally 20-foot-wide by 656-footlong ST segments and are surrounded by no less than 1 foot of grout on all sides and up to 4 feet of backfill material. The two most recently placed CIG segments have an additional reinforced concrete mat to improve structural stability.

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Elevation of water table and various stratigraphic surfaces beneath E area low level waste disposal facility

Abstract: Note: This Rev.1 memorandum corrects two errors found in the Rev.0 memo and dataset:1. a data assembly/keystroke error (ground elevation at Slit Trench 6 vertex is 280.58', not 258.63'), and 2. a GIS data transformation error (caused by extent of SRS BEIDMS Sample Stations data layer).

Cited by 9 publications

References 0 publications

PORFLOW Implementation of Vadose Zone Conceptual Model for Naval Reactor Component Disposal Areas in the E-Area Low Level Waste Facility Performance Assessment

PORFLOW Implementation of Vadose Zone Conceptual Model for Naval Reactor Component Disposal Areas in the E-Area Low Level Waste Facility Performance Assessment

GoldSim E-Area Low-Level Waste Lacility Vadose Zone Model Benchmarking

Component-In-Grout Model Implementation for the E-Area Low-Level Waste Facility's Performance Assessment

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