DRC-2025-001480

May 7, 2025
Vern C. Rogers, Director of Regulatory Affairs
EnergySolutions, LLC
299 South Main Street, Suite 1700
Salt Lake City, UT 84111
RE:Federal Cell Facility Application Request for Information
Dear Mr. Rogers:
The Division of Waste Management and Radiation Control (Division) hereby provides follow up Requests for Information (RFI) regarding the Federal Cell Facility Application dated August
4, 2022.
Each RFI in the attached document represents a follow up to an RFI issued earlier in the application review process. The numbering system ties the additional questions to the initial
RFI with an added letter designation. When responding to an RFI, please use the assigned number representing the question.
With this round of follow up RFIs, the Division recommends that appropriate staff from the Licensee, the Division and consultants meet to discuss each matter for clarity. Please contact
Larry Kellum at 385-622-1876 to schedule a meeting.
Sincerely,
Douglas J. Hansen, Director
Division of Waste Management and Radiation Control
DJH/LK/JMK
Enclosure: Federal Cell Application, Requests for Information.
c:Jeff Coombs, EHS, Health Officer, Tooele County Health Department
Bryan Slade, Environmental Health Director, Tooele County Health Department EnergySolutions General Correspondence EmailLLRW General Correspondence Email
Federal Cell Application Review
Request for Information or Updates to the Application (RFI)
General
Each of the RFI’s has been assigned an identifier with a numbering convention as follows-
Application/Appendix Section
Section/Appendix Subsection
Section/Appendix Subsubsection (when applicable)
Sequential numbering
Example: A question in Section 1, subsection 1, subsubsection 1 -The first RFI # would be 1.1.1-1, the next question in that section/subsection would be numbered 1.1.1-2
Please refer to the assigned RFI number when submitting a response.
Appendix AB:Operational Period Modeling
AB-7.b.1
The review of revision 3 of Appendix AB and NAC-0023_R7 confirmed that the RESRAD-OFFSITE inventory has been updated. Revision 3 of Appendix AB states “Because DU PA v4.0 includes distributions
for uranium isotopes from both SRS and GDP populations, the higher concentrations from GDP waste were used for U-234, U-235, U-236, and U-238. The GDP waste does not report U-233 concentrations,
so SRS waste is used here.” After comparing the reported U-234, U-235, U-236, and U-238 concentrations of SRS waste and GDP waste in NAC-0023_R7, it was confirmed that the GDP waste
concentrations are higher for U-234, U-235, and U-238, but SRS waste has a higher U-236 concentration than GDP waste (GDP = 2.17E+2 pCi/g; SRS = 4.91E+3 pCi/g). 
In review of the spreadsheet “DU waste concs and RESRAD results-Feb 2025.xlsx” it was found that in the calculations for the RESRAD-OFFSITE radionuclide inventory, the lower U-236 concentration
for GDP waste was used with the SRS mass. For U-234, U-235, and U-238, the higher GDP concentrations were used with the GDP mass. Please rerun the model with the updated inventory to
use the higher SRS U-236 concentration in these calculations.