ML22074A017
| ML22074A017 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 03/10/2022 |
| From: | Saxton J NRC/NMSS/DDUWP/URMDB |
| To: | |
| James Smith, 301-415-6103 | |
| Shared Package | |
| ML22074A008 | List: |
| References | |
| Download: ML22074A017 (6) | |
Text
Licensing of Uranium Recovery Facilities John Saxton Nuclear Regulatory Commission Uranium Recovery License Branch Staffs Preliminary Calculations:
Indications that the Groundwater Release Criterion may not be met within the Proposed Remediation Time Frame Backup slides Former Cimarron Facility Guthrie, Oklahoma March 10, 2022 John Saxton, NRC Hydrogeologist
Model Features
- Teal - Model Area Boundary
- Blue - Drainage
- Magenta - Extraction and injection trenches
- Yellow - Extraction wells
- Created ARCGIS Shapefiles (polygon, polyline, point) for these features in order to develop a unstructured grid 2
Base Map Source: DP Figure 2-1
Model Unstructured Grid Use the program AlgoMesh to develop a Voronoi-cell unstructured grid Minimum cell length is 4 feet for the extraction trenches and wells Once the grid was developed, it was imported directly to the MODFLOW GUI All layers has same grid 3
Surficial Expressions pf Geologic Units First step is to define the surficial expression of bedrock and recent deposits (assumes maximum extent of recent deposits)
Yellow - Center of Voronoi to simulate extent of recent unconsolidated aquifer in near surface Red - Center of Voronoi to simulate extent of bedrock in near surface 4
Base Map Source: DP Figure 2-1
Model Layering
- Red - Recent deposits
- Brown - Bedrock
- Yellow - Primary area of interest 5
North Assumed flat layering with a constant thickness Sandstone B divided into 3 layers in an attempt to explain perched conditions What happens to flow in a layer that pinches out at ground surface?
South Groundwater Flow
Recent Deposits Bottom Elevations used for Model Development 6