Publications

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Performance Assessment Modeling and Sensitivity Analyses of Generic Disposal System Concepts

Sevougian, Stephen D.; Freeze, Geoffrey; Gardner, William P.; Hammond, Glenn E.; Mariner, Paul

The Used Fuel Disposition Campaign (UFDC) of the U.S. Department of Energy (DOE) Office of Nuclear Energy (NE) is conducting research and development (R&D) on generic deep geologic disposal systems (i.e., repositories) for high-activity nuclear wastes (i.e., used nuclear fuel (UNF) and high-level radioactive waste (HLW)) that exist today or that could be generated in future fuel cycles. This report describes specific activities in FY2014 toward the development of an enhanced generic disposal system modeling and analysis capability that utilizes high performance computing (HPC) environments to simulate important multi-physics phenomena and couplings associated with the potential behavior of a geologic repository for UNF and HLW.

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TYPE SAND Report YEAR 2014
DOIOSTI

Analysis report for WIPP colloid model constraints and performance assessment parameters

Mariner, Paul; Sassani, David C.

An analysis of the Waste Isolation Pilot Plant (WIPP) colloid model constraints and parameter values was performed. The focus of this work was primarily on intrinsic colloids, mineral fragment colloids, and humic substance colloids, with a lesser focus on microbial colloids. Comments by the US Environmental Protection Agency (EPA) concerning intrinsic Th(IV) colloids and Mg-Cl-OH mineral fragment colloids were addressed in detail, assumptions and data used to constrain colloid model calculations were evaluated, and inconsistencies between data and model parameter values were identified. This work resulted in a list of specific conclusions regarding model integrity, model conservatism, and opportunities for improvement related to each of the four colloid types included in the WIPP performance assessment.

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TYPE SAND Report YEAR 2014
DOIOSTI

Algebraic calculation of erb dilution, capture, retardation, decay, and dose

14th International High-Level Radioactive Waste Management Conference, IHLRWMC 2013: Integrating Storage, Transportation, and Disposal

Mariner, Paul

Dose rate calculations for a receptor well in a generic reference aquifer are highly dependent on the mixing that occurs in the aquifer and well. This paper presents analytical expressions for determining radionuclide concentrations at the receptor well in a generic aquifer by calculating the overall dilution that occurs in the system and factoring in the effects of travel time and radionuclide decay. Expressions are derived for four types of sources: vertical borehole (advective), point source (advective), point source (diffusive), and broad area diffusion. Example applications of each solution are presented and compared.

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TYPE Conference YEAR 2013
OSTIScopus

Proceedings of the Scientific Visit on Crystalline Rock Repository Development

Mariner, Paul; Hardin, Ernest

A scientific visit on Crystalline Rock Repository Development was held in the Czech Republic on September 24-27, 2012. The visit was hosted by the Czech Radioactive Waste Repository Authority (RAWRA), co-hosted by Sandia National Laboratories (SNL), and supported by the International Atomic Energy Agency (IAEA). The purpose of the visit was to promote technical information exchange between participants from countries engaged in the investigation and exploration of crystalline rock for the eventual construction of nuclear waste repositories. The visit was designed especially for participants of countries that have recently commenced (or recommenced) national repository programmes in crystalline host rock formations. Discussion topics included repository programme development, site screening and selection, site characterization, disposal concepts in crystalline host rock, regulatory frameworks, and safety assessment methodology. Interest was surveyed in establishing a "club", the mission of which would be to identify and address the various technical challenges that confront the disposal of radioactive waste in crystalline rock environments. The idea of a second scientific visit to be held one year later in another host country received popular support. The visit concluded with a trip to the countryside south of Prague where participants were treated to a tour of the laboratory and underground facilities of the Josef Regional Underground Research Centre.

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TYPE SAND Report YEAR 2013
DOIOSTI
Results 151–175 of 182
Results 151–175 of 182