ML24032A035
| ML24032A035 | |
| Person / Time | |
|---|---|
| Issue date: | 02/01/2024 |
| From: | Cynthia Barr, Chris Mckenney, Snead K, Bruce Watson Division of Decommissioning, Uranium Recovery and Waste Programs, NRC/NMSS/DDUWP/RTAB, Environmental Protection Agency |
| To: | |
| Shared Package | |
| ML24032A030 | List: |
| References | |
| Download: ML24032A035 (15) | |
Text
Federal and NRC Guidance Updates on Radiological Survey and Dose Modeling Cynthia Barr, Christepher McKenney, and Bruce Watson, US NRC Kathryn Snead, US EPA EPRI/NEI Decommissioning Conference Oceanside, CA January 30-February 1
Guidance Updates
- Federal guidance updates
- MARSSIM Rev. 2
- NRC guidance updates
- Interim Staff Guidance (DUWP-ISG-02)
- Update to NUREG/CR-7021
Federal Radiological Survey Guidance MARSSIM Rev. 2
Changes to MARSSIM Site-specific Scanning Surveys
Changes to MARSSIM Continuously Collected Data Image Credit: Oak Ridge Associated Universities.
Image Credit: PNNL-SA-157412, Pacific Northwest National Laboratory.
Changes to MARSSIM Scenario B 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0
2,000 4,000 6,000 8,000 10,000 Power, 1 -
True Surface Activity Concentration [Bq m-2]
Approximate AL DL
Other Changes to MARSSIM Measurement Quality Objectives
=
1 2
2 1 +
2 2
2 2 + +
2 2
NRC Guidance Updates
NRC Interim Staff Guidance-Subsurface Investigations
- Two subsurface workshops were held July 2021 and May 2022 with over 160 and 120 participants, respectively
- Technical topics included:
- Geospatial tools for radiological survey design
- Dose modeling for subsurface residual radioactivity
- Consideration of elevated areas
- NEI groundwater protection initiative
- Characterization of basement substructures
- Innovative technologies for subsurface characterization
- Case studies and lessons learned
- SC&A, Inc. (NRC contractor) issued a draft white paper which was discussed in the workshops
- An interim staff guidance was prepared based on workshop findings and other information
- An update to NUREG/CR-7021 is also in progress 9
https://www.nrc.gov/waste/decommissioning/whats-new.html Industry State Agencies Federal Registrants
Draft Interim Staff Guidance DUWP-ISG-02 Radiological Surveys and Dose Modeling of the Subsurface to Support License Termination Extends NUREG-1575 Multi-Agency Radiation Survey and Site Investigation (MARSSIM) to the subsurface--
addressing surveys of open excavations, reactor basement substructures, and materials planned for reuse among other topics
DUWP-ISG-02 Dose Modeling for Submerged Sources Addresses guidance gaps for use of commonly used decommissioning dose modeling codes to develop clean-up levels for unsubmerged and submerged sources, including basement substructures
DUWP-ISG-02 Dose Modeling for Existing Groundwater Contamination Addresses guidance gaps regarding adequacy of groundwater monitoring networks and assessment of risk from existing groundwater contamination
DUWP-ISG-02 Public Comments Issued in October 19, 2023, with a 60-day public comment period (88 FR 72112)
Comments were due December 18, 2023 12 comments were received including the following:
- 1. Level of survey needed for reuse of offsite materials
- 2. Need for and nature of site-specific support for risk-significant parameters
- 3. Adding realism to assessment of risk from existing groundwater contamination
DUWP-ISG-02 Next Steps A comment response document will be prepared along to accompany the final DUWP-ISG-02 which is expected to be published in late summer 2024.
The final DUWP-ISG-02 will be incorporated into the next revision of NUREG-1757, Volume 2, Rev. 2.
NUREG/CR-7021 and PNNLs Visual Sample Plan are also being updated.
You can find the ISG and other related reports on NRCs What's New in Decommissioning web site.
Thank you
- For additional information please contact the following individuals:
Cynthia Barr, NRC/NMSS Cynthia.barr@nrc.gov Randall Fedors, NRC/NMSS Randall.fedors@nrc.gov