Recommended Henry’s Law Constants for Non-Groundwater Pathways Models in GoldSim

Dyer, James A.

doi:10.2172/1365662

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The upper boundary condition for the PORFLOW models is defined by time-dependent infiltration rates to account for the operational period (uncovered), the IC period (interim cover), and the post-IC period (final cover system installed followed by ongoing degradation of the closure cap). Several conceptual and numerical modeling studies (Dyer, 2017b;Dyer, 2017d;2018a;2018b;Dyer, 2019b;Dyer and Flach, 2017; have been conducted to identify a set of bounding conceptual infiltration models for the final closure cap design and to provide sets of both intact and subsidence infiltration rates as a function of time and non-crushable container content (i.e., percent subsidence). This collective body of work is summarized by Dyer (2019b) in the Infiltration Data Package for the ELLWF.…”

Section: Infiltration Rate Boundary Conditionsmentioning

confidence: 99%

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 4

MAYER

Hamm

ALEMAN

et al. 2023

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air, and radon. This section describes the development and implementation of conceptual models for STs and ETs for the GW protection pathway. The ST and ET conceptual models for the IHI exposure pathway are described in Section 3.7.3 and Section 7.3. ST and ET conceptual models for the air and radon pathways are described in Section 3.6. STs and ETs are considered together in this section because the similarities in their facility design; waste characterization; and physical, hydraulic, and chemical properties result in the same (or nearly the same) GW conceptual model.A GW transport analysis is conducted to determine maximum radionuclide concentrations as a function of time within the 100-meter POA buffer zone. PORFLOW (ACRi, 2018), which models both steady-state and transient flow and transport of radionuclide chains (parents and daughters) in porous media, is the primary analysis tool used. Two-and three-dimensional flow and transport analyses are performed to describe, in detail, the migration of species from the trench waste zones downward through the VZ to the underlying water table . VZ simulations (treated as source terms) results are input into a 3-D aquifer transport model to compute maximum GW concentrations of radionuclides within the 100-meter POA. Preliminary GW protection and all-pathways disposal limits for STs and ETs over the 1,000-year period of performance are developed from the computed maximum GW concentrations using the PA/CA Performance Assessment for the Implementation of Groundwater Modeling E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site SRNS-RP-2022-00270 / SRNL-STI-2021-00388 Revision A 4-5completed stack of boxes using a bulldozer. This step brings the trench up to grade and fills in voids between the individual boxes and between the stacks of boxes and the trench sidewalls.Based on this conceptual model, Phifer (2010) developed, and Nichols and Butcher (2020) later refined, a recommended set of blended material and hydraulic property values for containerized waste disposal in STs before and after dynamic compaction (see Table 4-1). This conceptual model also applies to containerized waste in ETs as discussed in Section 4.1.1.2.Inputs and assumptions for the blending calculations are as follows (SRNL, 2020):• The outside dimensions of a B-25 box are 6.0182-foot long, 3.8482-foot wide, and 3.9353-foot high, equating to an average exterior volume of 91.1380 ft 3 (2,580,742 cm 3 ).• The inside dimensions of a B-25 box are 6.0000-foot long, 3.8300-foot wide, and 3.9170-foot high, equating to an average interior volume of 90.0127 ft 3 (2,548,875 cm 3 ).• The volume of waste in a B-25 box is equal to the interior volume 90.0127 ft 3 (2,548,875 cm 3 ); the total waste volume in a stack of four B-25 boxes is 360.0506 ft 3 (10,195,499 cm 3 ).• The average density of uncompacted waste within a B-25 box is 0.1785 g cm -3 (Phifer and Wilhite, 2001).• The total waste mass in a four-high stack of B-25 boxes is 1,819,897 grams (10,195,499 cm 3 × 0.1785 g cm -3 ).• Th...

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Section: Infiltration Rate Boundary Conditionsmentioning

confidence: 99%

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 4

MAYER

Hamm

ALEMAN

et al. 2023

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“…Henry's Law constants employed in Tier 2 screening were calculated by Dyer (2017d). Two different geochemical environments described by Denham (2010) are considered.…”

Section: Tier-2 Groundwater Screeningmentioning

confidence: 99%

“…For the relevant species, Henry's Law constants will be greater (higher volatility) under Soil Condition A than under Aged Concrete, hence screening based on Henry's Law constants at pH 5.5 will be bounding for these elements. Two elements not considered by Dyer (2017d) have been added because of their presence in the Tier-1 list -astatine and phosphorus. Very few properties of astatine have been directly measured, including volatility.…”

Section: Tier-2 Groundwater Screeningmentioning

confidence: 99%

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 2

MAYER

Hamm

ALEMAN

et al. 2023

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According to U.S. Census Bureau's annual estimates of resident population, based on 2010 census data, the estimated 2019 population in the eight-county region of influence (ROI) is 610,073 (Table 2-2). Four counties each are in South Carolina (Aiken, Allendale, Bamberg, and Barnwell) and Georgia (Burke, Columbia, Richmond, and Screven). The ROI includes counties within and immediately adjacent to SRS (see Figure 2-2) where most SRS workers reside. Approximately 87% of the eight-county 2019 estimated population lived in three counties: Aiken County, SC (28.0%), Columbia County, GA (25.7%), and Richmond County, GA (33.2%). The balance of the eight-county 2019 estimated population (~13%) lived in Allendale, Barnwell and Bamberg counties in South Carolina and Burke and Screven counties in Georgia. Table 2-2. Population Distribution and Percent of Region of Influence for Counties and Selected Communities Jurisdiction 2019 Population Estimate 1 2019 %ROI SOUTH CAROLINA

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Recommended Henry’s Law Constants for Non-Groundwater Pathways Models in GoldSim

Abstract: This memorandum documents the source and numerical value of Henry's law constants for volatile radionuclides of interest used in the non-groundwater (air and radon) pathways models for the 2018 E-Area Performance Assessment. Results / Conclusions

Cited by 2 publications

References 6 publications

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 4

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 4

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 2

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