ML25043A048
| ML25043A048 | |
| Person / Time | |
|---|---|
| Site: | PROJ0735 |
| Issue date: | 03/05/2025 |
| From: | Cynthia Barr, Maurice Heath NRC/NMSS/DDUWP/LLWPB, NRC/NMSS/DDUWP/RTAB |
| To: | |
| References | |
| Download: ML25043A048 (0) | |
Text
SUMMARY
OF U.S. NUCLEAR REGULATORY COMMISSION (NRC) AND U.S. DEPARTMENT OF ENERGY (DOE) VIRTUAL PUBLIC MEETING TO DISCUSS TECHNICAL CLARIFICATION OF NRC REQUEST FOR ADDITIONAL INFORMATION ON IDAHO NATIONAL LAB CALCINE STORAGE FACILITY WIR EVALUATION DATE: September 24, 2024 ATTENDEES (NRC): Chris McKenney, Duane White, Cynthia Barr, Louis Caponi, Maurice Heath, Cardelia Maupin ATTENDEES (NRC CONTRACTOR): Osvaldo Pensado, Stuart Stothoff, David Pickett ATTENDEES (DOE): Valerie Kimbro, Gregery Balsmeier, David Thorne, Erik Simpson, William Kirby, Rodrigo Lobos, Richard Chang, Arthur Rood, James McCarthy General On October 20, 2023, the Department of Energy (DOE) submitted the Draft Basis for Section 3116 Determination for Closure of the Calcined Solids Storage Facility (CSSF) at the Idaho National Laboratory Site for the NRC to review. The DOE submittal to the NRC is required under Section 3116 (a) of the Ronald W. Reagan National Defense Authorization Act for Fiscal Year 2005 (NDAA).
On April 8, 2024, NRC issued a Request for Additional Information (RAI) to DOE regarding its Draft Waste Incidental to Reprocessing (WIR) Evaluation for the Closure of the Calcined Solids Storage Facility at the Idaho National Laboratory Site (ML24095A110). This public meeting is the 3rd meeting with DOE regarding the RAIs. The first two public meeting summary documents can be found in NRCs Agencywide Documents Access and Management System (ADAMS) -
ML24298A032 and ML24270A089. The purpose of the public meetings are to discuss DOEs intended responses to the RAIs and to provide an opportunity for NRC and DOE to ask clarifying questions. The public meeting outcome establishes a common understanding of the information that is needed for the NRC to complete its review. The RAI public meeting supports NRCs consultation role as defined in Section 3116 of the NDAA.
On September 24, 2024, the NRC held a virtual public meeting with DOE and stakeholders to discuss NRC RAIs on natural system and engineered system distribution coefficients, and sensitivity and uncertainty analysis. The public meeting was noticed on the NRC public meeting schedule webpage https://www.nrc.gov/pmns/mtg. The public meeting presentation slides are in ADAMS - ML24352A006.
Agenda Item 1. Clarification of RAI PA-4 NRC requested additional information regarding the selection of natural and engineered system distribution coefficients (Kds) used in the screening analysis and base case in the performance assessment (PA). NRC also requested clarification regarding parameter distributions used in the uncertainty analysis values and the basis for considering time invariant Kd values for cementitious materials (i.e., Kds did not consider chemical evolution of the cementitious
materials over time as the materials degraded). DOE indicated that they assumed Kds consistent with oxidizing conditions.
DOE understands the RAI and plans to provide additional information to support Kds assumed in the CSSF PA, perform additional analyses to address technical issues identified in the RAI or to correct errors identified in the PA.
Agenda Item 2. Clarification of RAI PA-6 NRC discussed the need for additional sensitivity and uncertainty analysis to better understand system performance including consideration of alternative conceptual models leading to faster release and transport rates through the engineered and natural systems and consideration of multiple barrier failures. NRC also requested critical review of its selection of uncertain parameters and associated parameter distributions used in the uncertainty analysis. DOE indicated that its use of one factor at a time analyses was intended to capture the range in uncertainty.
DOE understands the RAI and plans to provide additional information to support its uncertainty analysis including results of additional one-factor-at-a-time (OFAT) and multiple-factor-at-a-time (MFAT) analyses.
Summary In October 2023, DOE submitted the Draft Basis for Section 3116 Determination for Closure of the Calcined Solids Storage Facility at the Idaho National Laboratory Site for the NRC to review.
In April 2024 NRC issued RAIs to DOE. NRC conducted multiple virtual public meetings to provide clarification on the RAIs issued to DOE on the Draft Basis for Section 3116 Determination for Closure of the Idaho National Laboratory Calcined Solids Storage Facility.
These RAI public meetings support NRCs consultation role as defined in Section 3116 of the Ronald W. Reagan National Defense Authorization Act for Fiscal Year 2005.
The meeting provided an opportunity for NRC and DOE to ask clarifying questions and establish a common understanding of the information that is needed for the NRC to complete its review.
DOE responded that the RAI questions were clarified, and DOE believes they have a path forward for responding to the RAIs. By letter dated December 9, 2024, DOE stated they will respond to NRC RAIs no later than March 31, 2025 (ML25014A034).
ML25043A048 OFFICE NMSS/DUWP
/LLWPB NMSS/DUWP
/RTAB NMSS/DUWP/RTAB NMSS/DUWP
/LLWPB NAME MHeath CBarr CMcKenney DWhite DATE Feb 12, 2025 Feb 13, 2025 Feb 13, 2025 Feb 28, 2025