ML22140A298
| ML22140A298 | |
| Person / Time | |
|---|---|
| Issue date: | 03/08/2022 |
| From: | Cynthia Barr Division of Decommissioning, Uranium Recovery and Waste Programs |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML22140A298 (19) | |
Text
Guidance and Other Decommissioning Initiatives Cynthia Barr, Senior Risk Analyst Division of Decommissioning, Uranium Recovery, and Waste Programs
Guidance Updates
- NUREG-1757, Consolidated Decommissioning Guidance Volume 1, Rev. 3, Decommissioning Process for Materials Licensees (to be issued as draft for public comment)
Volume 2, Rev. 2, Characterization, Survey, and Determination of Radiological Criteria (to be finalized summer 2022)
- NUREG-1575, Rev. 2, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)
(to be finalized) 2
Significant Changes to NUREG1757, Volume 1
- Provides guidance related to fees as sites transition from the operational to the decommissioning life cycle phase Add picture here
- Includes new guidance on 10 CFR 20.1406 requirements related to the minimization of contamination
- Updates information on the Site Decommissioning Management Plan (SDMP) 3
Major Changes to NUREG1757, Volume 2
- Dose modeling updates Model abstraction and simplification Exposure scenarios for buried radioactivity Consideration of elevated areas Support for distribution coefficients Uncertainty analysis considerations
- Radiological surveys updates Surveys of open excavations Surveys of soils/materials for reuse Alternative statistical tests Composite sampling 4
NUREG1757 Path Forward
- Volume 1, Rev. 3, has been developed and is expected to be issued for public comment in late 2022
- Volume 2, Rev. 2, was issued for public comment in December 2020 (ADAMS Accession No. ML20273A010)
Over 200 comments in nine comment letters Final publication expected in summer 2022 Interim guidance to be developed later in 2022/2023 to address remaining comments 5
MARSSIM, Revision 2
- Notable updates include Scan-only surveys Statistical tests and associated parameters Treatment of elevated areas Measurement quality objectives Updated field instruments Rank set sampling
- Public comment period ended February 2022
- Science Advisory Board peer reviewed 6
MARSSIM, Revision 2, Comments
- Scan survey considerations (validation, metrics)
- Need for guidance in the areas of Modern survey systems with data logging Discrete radioactive particles Subsurface radiological surveys
- Measurement quality objectives/uncertainty
- Scenario B applicability/test parameters
- Surrogate ratios for hard-to-detect radionuclides
- Additional examples for multiple radionuclides
Other Decommissioning Guidance and Code Development Initiatives
- Subsurface investigations guidance
- Discrete radioactive particles guidance
- Visual Sample Plan (VSP) computer code improvements 8
Subsurface Investigation Guidance
- Workshop held July 2021 with over 160 participants
- SC&A technical report to be completed March 2022
- VSP scoping tools report to be completed April 2022
- Second workshop planned for May 11, 2022, to accept comments on technical report and discuss proposed methodologies
- Interim guidance to be completed in late 2022/early 2023 9
Discrete Radioactive Particles (DRP)
- DRP survey methods
- DRP dosimetry Skin dose Inhalation and ingestion dose Exposure scenarios
- How to control DRPs
- Workshops to take place late 2022
- Need for interim guidance or some other form of communication currently under staff consideration 10
Visual Sample Plan (VSP)
- Prospective and retrospective power curvesScenario B
- Calculation of reference area variability (Kruskal-Wallis/
ANOVA) with user specification of test parameters
- Quantile test parameters (power, quantile/critical value)
- Add three-dimensional capabilities
- Scoping out subsurface survey tools
- Add tools for modern data logging systems (without surveyor vigilance or with autonomous vehicles) 11
Conclusions
- Several guidance initiatives are completed or well underway to share lessons learned and experience from the review of license termination plans and final status surveys
- NRC has contracted work to improve the guidance in complex technical areas not currently addressed in Federal guidance
- NRC has solicited feedback from stakeholders and provided opportunities for public participation in the process; additional opportunities are planned
- Improvements to computational tools are being made to facilitate survey design, data analysis, and risk assessment
- NRC is committed to working with its stakeholders to increase the timeliness and efficiency of the decommissioning process while ensuring public health and safety during and following decommissioning and site release 12
Backup slides 13
NUREG1757 Team Members Regional Sta:
Michael LaFranzo, Region III, Health Physics Inspector NRC Headquarters Sta (Volume 1): NRC Headquarters Sta (Volume 2):
Christopher J. Grossman, Project Manager Cynthia Barr, Senior Risk Analyst Stephen Giebel, Health Physicist Greg Chapman, Health Physicist Allen Gross, Risk Analyst Sheldon Clark, Office of the General Kenneth Kline, Financial Analyst Counsel Leah Parks, Risk Analyst Adam Schwartzman, Risk Analyst 14
NUREG1757, Volume 1 Contact Information Christopher J. Grossman christopher.grossman@nrc.gov 301-415-0140 15
NUREG1757, Volume 2 Contact Information Cynthia Barr cynthia.barr@nrc.gov 301-415-4015 16
MARSSIM Contact Information Sarah Tabatabai Kathryn Snead sarah.tabatabai@nrc.gov snead.kathryn@epa.gov 301-415-2382 202-343-9228 17
Discrete Radioactive Particle Contact Information Gregory Chapman David Brown gregory.chapman@nrc.gov david.brown@nrc.gov 301-415-8718 301-415-7677 18
Subsurface Investigations and VSP Contact Information Tom Aird Kerstun Norman thomas.aird@nrc.gov kerstun.norman@nrc.gov 301-415-2442 301-415-5883 19