Proceedings of the Radon Barriers Workshop (NUREG/CP-0312)
On this page:
Download complete document
Manuscript Completed: June 2019
Date Published: August 2019
Prepared by: Mark Fuhrmann1, Craig Benson2, Jody Waugh3, Morgan Williams4, and Hans Arlt1
1 U.S. Nuclear Regulatory Commission
2 University of Virginia
3 Navarro Research and Engineering, Inc.
4 University of California Berkeley
Mark Fuhrmann, NRC Project Manager
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001
The "Radon Barriers Project" is a research program to study the effects of changes in the properties of in-service engineered earthen covers over uranium mill tailings as these covers age. Field studies were conducted at four mill tailing disposal sites: Falls City in Texas, Bluewater in New Mexico, Shirley Basin South in Wyoming, and Lakeview in Oregon. Small areas on these sites were excavated, radon fluxes were measured, numerous observations were made, and samples were taken for a variety of parameters, such as saturated hydraulic conductivity, root counts, moisture, density, lead-210 concentrations, soil texture, structure, chemistry, and nematode counts.
On July 25–26, 2018, a one-and-a-half-day workshop took place at NRC Headquarters to discuss findings from the project with regard to the current state of the barriers and comparison to their as-built condition and natural analog sites, prediction of long-term evolution, monitoring approaches, and long-term implications. Presentations included detailed background and project findings on the following:
NRC and DOE/LM activities that led to the Radon Barriers Project
radon fluxes and their variability, radon diffusion coefficients, and radon travel times through the covers
hydraulic conductivity of the barriers at various depths and comparisons to hydraulic conductivity at nearby natural analog sites
ecological evolution of covers and the impact of vegetation on cover properties, especially on water percolation, radon flux, and evapotranspiration
soil architecture observations, including soil structure, biology, and chemistry
potential use of lead-210 as a long-term indicator of radon transport within barriers
A facilitated discussion followed each presentation to discuss long-term evolution of the sites as suggested by the project findings, use of the findings for maintenance and prediction, future information needs, and policy implications.
Page Last Reviewed/Updated Thursday, March 25, 2021