ML19039A253

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Final NRC Presentation for 02-12-2019 NRC Public Meeting
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)
v • d • e


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

Current Status and Prioritization of SDF Monitoring Factors MA 1 MA 2 MA 3 MA 4 MA 5 MA 6 MA 7 MA 8 MA 9 MA 10 MA 11 Infiltration Waste Form Waste Form Waste Form Subsurface Environmental Site Stability Performance Radiation Inventory Disposal Transport Monitoring Assessment Model Protection and Erosion Hydraulic Physical Chemical Structure Revisions Program Control Performance Degradation Degradation Performance - 7.01 - - 8.01 - - 9.01 - - 10.01 - - 11.01 -

- 1.01 - - 2.01 - - 3.01 - - 4.01 - - 5.01 - - 6.01 - Certain Risk- Leak Detection § Settlement Due Implementation of Conceptual Dose to Significant Kd to Increased Models +/- Individuals Inventory in Hydraulic Hydraulic Waste Form Radionuclide Certain Risk-Values in Site Overburden During Disposal Performance of Conductivity of Matrix Release from Significant Kd Sand and Clay Operations Structures § Closure Cap Field-Emplaced Degradation +/- Field-Emplaced Values in - 8.02 - - 9.02 - - 10.02 - - 11.02 -

Saltstone +/- Saltstone +/- Disposal Groundwater Settlement Due Defensibility of Conceptual Air Monitorin Monitoring § to Dissolution of Models +/-

Structure Calcareous - 10.03 -

Concrete Sediment Diffusivity in Degraded

- 1.02 - - 2.02 - - 3.02 - - 4.02 - - 5.02 - - 6.02 - Saltstone Methods Used Erosion Control Variability of Waste Form Chemical Tc Sorption in - 8.03 - - 10.04 -

of the SDF Identification and Kd Values for Saltstone to Assess Field-Emplaced Macroscopic Reduction of Tc Disposal Monitoring of Inventory Engineered Saltstone +/- Fracturing +/- by Saltstone +/- Structure Groundwater - 10.05 -

Surface Cover Concrete +/- Plumes in the Z Moisture Characteristic and Adjacent Area +/- Curves

- 10.06 -

Area.

Kd Values for Disposal

- 3.03 - - 5.03 - - 6.03 - Structure Concrete Applicability of Reducing Performance of - 10.07 -

Laboratory Data Capacity of Disposal Calculation of Build-Up in to Saltstone Structure Roofs Biosphere Soil

- 10.08 -

Field-Emplaced and HDPE/GCL Consumption Factors and Saltstone +/- Layers Uncertainty Distributions for

- 3.04 - - 5.04 - - 6.04 - Transfer Factors Effect of Curing Certain Risk- Disposal - 10.09 -

Kd Values for SRS Soil Temperature on Significant Kd Structure

- 10.10 -

Saltstone Values for Concrete Far-Field Model Calibration Hydraulic Saltstone Fracturing - 10.11 -

Properties +/- Far-Field Model Source Loading Approach

- 5.05 - - 6.05 -

- 10.12 -

Potential for Integrity of Far-Field Model Dispersion Short-Term Non- - 10.13 -

Rinse-Release cementitious Impact of Calcareous Zones from Saltstone Materials on Contaminant Flow and Transport

§ Periodic Monitoring Factors (i.e., MFs related to data that NRC staff expects to review on a periodic basis)

- 10.14 -

Low Priority Scenario Development and Medium Priority Defensibility

+/- High Priority

§ Periodic Monitoring Factors (i.e., MFs related to data that NRC staff expects to review on a periodic basis)

Closed Low Priority 7

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

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

- 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 11

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
  • 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

  • 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
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