ML19039A253

Final NRC Presentation for 02-12-2019 NRC Public Meeting

ML19039A253
Person / Time
Site:	PROJ0734
Issue date:	02/12/2019
From:	Harry Felsher, McKenney C, 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 02-12-2019Bo Pham, Acting Director, DUWPChristepher McKenney, Acting Deputy Director, DUWPHarry 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 SaltstoneDisposal 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

-saltstonecores-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 7MA 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 K d 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.f - 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 - Reduci ng Capacity of Saltstone f - 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 K d Values for Saltstone - 6.04 - Disposal Structure Concrete Fracturing

- 5.05 - Potential for Short-Term Rinse-Release from Saltstone - 6.05 - Integrity of N on-cementitious Materials § Periodic Monitoring Factors (i.e., MFs related to data that NRC staff expects to review on a periodic basis) f 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 K d Values in Site Sand and Clay - 8.01 - Leak Detection

§ - 9.01 - Settlement Due to Increased Overburden

- 10.01 - Implementation of Conceptual Model s +/- - 11.01 - Dose to Individuals During Operations

- 8.02 - Groundwater Monitoring

§ - 9.02 - Settlement D ue to Dissolution of Calcareous Sediment - 10.02 - Defensibility of Conceptual Model s +/- - 11.02 - Air Monitorin

- 10.03 - Diffusivity in Degraded Saltstone - 8.03 - Identification and Monitoring of Groundwater Plumes in the Z Area +/- - 10.04 - K d Values for Saltstone f - 10.05 - Moisture Characteristic Curves f - 10.06 - K d Values for Disposal Structure Concrete f - 10.07 - Calculation of Build

-Up in Biosphere Soil f - 10.08 - Consumption Factors and Uncertainty Distributions for Transfer Factors - 10.09 - K d Values for SRS Soil f - 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 f - 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) f 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 Part61 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 R esearch 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

• "SaltstoneLeaching 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 SaltstoneLeaching Experiment

-Status Report," May 2017. ML17221A038

• Two more reports expected soon 14 Future Activities at SRS

• DOE Plans to Issue Revised SDF Performance Assessment (PA) in 2020

• 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