ML19039A253
| ML19039A253 | |
| Person / Time | |
|---|---|
| Site: | PROJ0734 |
| Issue date: | 02/12/2019 |
| From: | Harry Felsher, Chris Mckenney, Bo Pham Division of Decommissioning, Uranium Recovery and Waste Programs |
| To: | |
| H FELSHER DUWP | |
| References | |
| Download: ML19039A253 (15) | |
Text
U.S. NRC NDAA WIR Monitoring Successes at U.S.
DOE Savannah River Site 02-12-2019 Bo Pham, Acting Director, DUWP Christepher McKenney, Acting Deputy Director, DUWP Harry Felsher, DUWP/LLWPB
NRC Monitoring at Savannah River Site (SRS)
- NRC Monitoring in Coordination with South Carolina as Required by the National Defense Authorization Act for Fiscal Year 2005 (NDAA)
- NRC Monitoring at Saltstone Disposal Facility (SDF) since 2007
- NRC Monitoring at F-Tank Farm (FTF) since 2012
- NRC Monitoring at H-Tank Farm (HTF) since 2015 2
NRC Monitoring Activities at SRS
- NRC Issues Plan to Monitor DOE
- Current NRC Monitoring Plans include Monitoring Areas and Monitoring Factors
- Monitoring Activities include:
- onsite observation visits
- technical reviews
- data reviews 3
Overall Successes for NRC Monitoring at SRS
- NRC/DOE Management Meetings
- Separate Monthly Teleconference Calls:
- NRC/DOE
- NRC/SCDHEC/EPA Region 4
- Updated Monitoring Plans
- NRC Letters Supplementing a Monitoring Plan
- Coordination of NRC/DOE Research Activities
- Making Progress on Closure of Monitoring Factors 4
Monitoring at SDF
- Initial SDF Monitoring Plan Issued in 2007
- Revision 1 SDF Monitoring Plan Issued in 2013
- 20 SDF OOVs since 2007
- 16 SDF TRRs issued, including:
- hydraulic performance of saltstone
- technetium waste release
- engineered cover performance 5
Successes for Monitoring at SDF
- Prioritization of Monitoring Factors Informed by Risk and Uncertainty
- DOE Research Aligned with NRC High-Priority Monitoring Factors
- saltstone cores
- simulated saltstone
- NRC Closed or Lowered in Priority Seven Monitoring Factors in Fiscal Year (FY) 2018
- NRC Opened Two New Monitoring Factors in FY 2018 6
7 MA 1 Inventory MA 2 Infiltration and Erosion Control MA 3 Waste Form Hydraulic Performance MA 4 Waste Form Physical Degradation MA 5 Waste Form Chemical Degradation MA 6 Disposal Structure Performance
- 1.01 -
Inventory in Disposal Structures §
- 2.01 -
Hydraulic Performance of Closure Cap
- 3.01 -
Hydraulic Conductivity of Field-Emplaced Saltstone +/-
- 4.01 -
Waste Form Matrix Degradation +/-
- 5.01 -
Radionuclide Release from Field-Emplaced Saltstone +/-
- 6.01 -
Certain Risk-Significant Kd Values in Disposal Structure Concrete
- 1.02 -
Methods Used to Assess Inventory
- 2.02 -
Erosion Control of the SDF Engineered Surface Cover and Adjacent Area.
- 3.02 -
Variability of Field-Emplaced Saltstone +/-
- 4.02 -
Waste Form Macroscopic Fracturing +/-
- 5.02 -
Chemical Reduction of Tc by Saltstone +/-
- 6.02 -
Tc Sorption in Disposal Structure Concrete +/-
- 3.03 -
Applicability of Laboratory Data to Field-Emplaced Saltstone +/-
- 5.03 -
Reducing Capacity of Saltstone
- 6.03 -
Performance of Disposal Structure Roofs and HDPE/GCL Layers
- 3.04 -
Effect of Curing Temperature on Saltstone Hydraulic Properties +/-
- 5.04 -
Certain Risk-Significant Kd Values for Saltstone
- 6.04 -
Disposal Structure Concrete Fracturing
- 5.05 -
Potential for Short-Term Rinse-Release from Saltstone
- 6.05 -
Integrity of Non-cementitious Materials
§ Periodic Monitoring Factors (i.e., MFs related to data that NRC staff expects to review on a periodic basis)
Low Priority Medium Priority
+/- High Priority Closed Current Status and Prioritization of SDF Monitoring Factors MA 7 Subsurface Transport MA 8 Environmental Monitoring MA 9 Site Stability MA 10 Performance Assessment Model Revisions MA 11 Radiation Protection Program
- 7.01 -
Certain Risk-Significant Kd Values in Site Sand and Clay
- 8.01 -
Leak Detection §
- 9.01 -
Settlement Due to Increased Overburden
- 10.01 -
Implementation of Conceptual Models +/-
- 11.01 -
Dose to Individuals During Operations
- 8.02 -
Groundwater Monitoring §
- 9.02 -
Settlement Due to Dissolution of Calcareous Sediment
- 10.02 -
Defensibility of Conceptual Models +/-
- 11.02 -
Air Monitorin
- 10.03 -
Diffusivity in Degraded Saltstone
- 8.03 -
Identification and Monitoring of Groundwater Plumes in the Z Area +/-
- 10.04 -
Kd Values for Saltstone
- 10.05 -
Moisture Characteristic Curves
- 10.06 -
Kd Values for Disposal Structure Concrete
- 10.07 -
Calculation of Build-Up in Biosphere Soil
- 10.08 -
Consumption Factors and Uncertainty Distributions for Transfer Factors
- 10.09 -
Kd Values for SRS Soil
- 10.10 -
Far-Field Model Calibration
- 10.11 -
Far-Field Model Source Loading Approach
- 10.12 -
Far-Field Model Dispersion
- 10.13 -
Impact of Calcareous Zones on Contaminant Flow and Transport
- 10.14 -
Scenario Development and Defensibility
§ Periodic Monitoring Factors (i.e., MFs related to data that NRC staff expects to review on a periodic basis)
Low Priority
NRC/DOE Joint Plan for SDF
Purpose:
Identify Information Needed to Support NRC Finding of Reasonable Assurance that DOE Demonstrated Meeting Title 10, Code of Federal Regulations Part 61 Subpart C Performance Objectives at SDF
- Needed Information Based on NRC High-Priority Monitoring Factors
- DOE Establishes the Schedule of Providing Information to NRC
- Joint Plan Issued 10/23/2018 - ML18235A068 8
Monitoring at Tank Farms (TFs)
- FTF Monitoring Plan Issued in January 2013
- TFs Monitoring Plan Issued in October 2015 to Include HTF
- Eight Onsite Observation Visits Since 2012
- 15 TFs TRRs issued, including:
- tank grouting
- waste release
- final inventory and risk estimates after tank closure 9
Current Prioritization of TFs Monitoring Factors
- NRC Performed Independent Analysis to Risk-Inform TFs Monitoring Plan and Prioritize Monitoring Factors 10
NRC/DOE Successes at TFs
- Highest Priority Monitoring Factor 2.1 (Solubility-Limiting Phases/Limits and Validation) was Addressed by DOE in Recent Research Efforts 11
- Results of several years of waste release testing of Tank 18 high-level waste samples completed in 2016
- NRC staff completed Waste Release Testing Technical Review Report (TRR) in 2018
Path Forward for Monitoring at TFs
- Results of DOE Tank 18 Waste Release Experiments Indicated Risk-Significant Solubilities for Plutonium (Pu) and Higher than Expected Solubility for Other Key Radionuclides
- Next Steps Include:
- reduction in uncertainty in barriers affecting the timing and magnitude of peak Pu dose including:
- natural system attenuation (chemical barrier delaying timing and magnitude of peak dose)
- tank/grout performance (hydraulic and chemical barrier to release)
- tank vault performance (chemical barrier to release) 12
CNWRA Research to Support NRC NDAA WIR Monitoring at SRS
- More Recent Activities Included:
- tank grout groundwater conditioning experiments
- saltstone/technetium release experiments 13
List of Recent CNWRA Research Reports for NRC on SDF and TFs
- Saltstone Leaching Experiments-Status Report, September 2015. ML15302A086
- Tank Grout Water Conditioning Tests-Status Report, September 2015. ML15302A081
- Fiscal Year 2016 Tank Grout Water Conditioning Tests-Status Report, January 2017. ML18285A834
- Fiscal Year 2016 Saltstone Leaching Experiment-Status Report, May 2017. ML17221A038
- Two more reports expected soon 14
Future Activities at SRS
- NRC Will Review Revised SDF PA and Issue Revised SDF Technical Evaluation Report
- NRC Will Issue Revised SDF Monitoring Plan
- NRC Currently Reviewing DOE Revised General Separations Area Groundwater Model for SDF and TFs 15