Saltstone Disposal Facility Mechanically Stabilized Earth Vault Closure Cap Degradation Base Case: Institutional Control To Pine Forest Scenario

Phifer, MA

doi:10.2172/822302

Cited by 4 publications

(3 citation statements)

References 2 publications

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“…One example of this practice is the disposal of ''saltstone" at the Department of Energy Savannah River Site near Aiken, SC [1]. Important potential degradation mechanisms for the saltstone vaults are sulfate attack, carbonation, leaching, alkali-aggregate reaction and reinforcement corrosion.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of cementitious materials degradation under external sulfate attack

Sarkar

Mahadevan

Meeussen

et al. 2010

Cement and Concrete Composites

187

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a b s t r a c tA numerical methodology is proposed in this paper to simulate the degradation of cementitious materials under external sulfate attack. The methodology includes diffusion of ions in and out of the structure, chemical reactions which lead to dissolution and precipitation of solids, and mechanical damage accumulation using a continuum damage mechanics approach. Diffusion of ions is assumed to occur under a concentration gradient as well as under a chemical activity gradient. Chemical reactions are assumed to occur under a local equilibrium condition which is considered to be valid for diffusion controlled reaction mechanisms. A macro-scale representation of mechanical damage is used in this model which reflects the cracking state of the structure. The mechanical and diffusion properties are modified at each time step based on the accumulated damage. The model is calibrated and validated using experimental results obtained from the literature. The usefulness of the model in evaluating the mineralogical evolution and mechanical deterioration of the structure is demonstrated.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of cementitious materials degradation under external sulfate attack

Sarkar

Mahadevan

Meeussen

et al. 2010

Cement and Concrete Composites

187

View full text Add to dashboard Cite

show abstract

“…A Microsoft Access database stores all material properties (i.e., porosity, water saturation, and bulk density) utilized in the ARM. The database also records the origin of each property value in the "Description" column (sources include: Hiergesell and Taylor, 2011;Nichols and Butcher, 2020;Phifer, 2003a;Phifer et al, 2006;WSRC, 2008). Material properties for the closure cap as well as the waste emplacement zone and engineered barriers for each ARM DU are defined in the following report sections: Section 3.4 (final closure cap), Section 5.1.5 (STs, ETs, and CIG trench segments), Section 5.2.3 (LAWV), Section 5.3.3 (ILV), and Section 5.4.3 (NRCDAs).…”

Section: Materials Properties Databasementioning

confidence: 99%

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 3

MAYER

HAMM

ALEMAN

et al. 2023

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are the PA for the INTEC calcined solids storage facility at the Idaho National Laboratory site (DOE-ID, 2019) and the PA for Waste Management Area C at the Hanford site (Mehta et al., 2016). The PA evaluates the potential impacts of changes in performance of different features of the system and demonstrates that the safety functions represent multiple and redundant barriers. Barrier analyses, assuming a safety function is not present, also test the robustness of the system in the event of the loss of one or more safety functions. Such evaluations also support a qualitative illustration of the concept of defense-in-depth.The safety concept for closure of the ELLWF encompasses a variety of different features (i.e., administrative controls, natural site features, and engineered barriers) that reduce the potential impacts on human health and the environment from the residual waste that will remain after closure. These features can be represented as a collection of safety functions acting independently and as a system to provide for overall safety. In some applications, attempts are made to assign numerical expectations to specific safety functions, but that is not the intent in this case. The concept of safety functions is used more qualitatively in two ways for this PA: 1. To illustrate the robustness of the ELLWF design, operational practices, and closure approach by documenting features that are and are not credited in different modeling cases.

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“…A Microsoft Access material database was created that contains all material properties (each material's porosity, water saturation, and bulk density) utilized within the ARM. The database also reports the reference for each property value within the "Description" column (these include : Phifer, 2003;Phifer, 2006;WSRC, 2008;and Hiergesell, 2011). Note that if statistics are not available, as is the case for both the waste and cap materials, the standard deviation is set to 0.1, the minimum value is 0.05 less than the deterministic value, and the maximum is 0.05 more than the deterministic value.…”

Section: Materials Databasementioning

confidence: 99%

Atmospheric release model for the E-area low-level waste facility: Updates and modifications

None¹

2017

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The atmospheric release model (ARM) utilizes GoldSim® Monte Carlo simulation software (GTG, 2017) to evaluate the flux of gaseous radionuclides as they volatilize from E-Area disposal facility waste zones, diffuse into the air-filled soil pores surrounding the waste, and emanate at the land surface. A schematic of the air pathway performance assessment (PA) analysis, after Dixon (2017), is shown in Figure E-1. The ARM is a PA model that will be treated as an "Engineering Calculation" and will not be used routinely, therefore it does not require a Software Quality Assurance Plan (SQAP). Each time results are created using ARM, the model will be design checked. This report documents the updates and modifications to the ARM for the next planned E-Area PA considering recommendations from the 2015 PA strategic planning team outlined by Butcher and Phifer ( 2016): 3.3 Non-Groundwater Pathways Calculation Improvements for Next PA Revision -RADON • Recommendation 75o Load inventory and start 1,000-year assessment period at end of E-Area LLWF Operations (beginning of IC).

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Saltstone Disposal Facility Mechanically Stabilized Earth Vault Closure Cap Degradation Base Case: Institutional Control To Pine Forest Scenario

Cited by 4 publications

References 2 publications

Numerical simulation of cementitious materials degradation under external sulfate attack

Numerical simulation of cementitious materials degradation under external sulfate attack

Performance Assessment for the E-Area Low-Level Radioactive Waste Disposal Facility at the Savannah River Site: Chapter 3

Atmospheric release model for the E-area low-level waste facility: Updates and modifications

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