ML25084A113
| ML25084A113 | |
| Person / Time | |
|---|---|
| Site: | 07007004 |
| Issue date: | 06/16/2025 |
| From: | NRC/NMSS/DREFS/EPMB2 |
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| Download: ML25084A113 (17) | |
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Environmental Center of Expertise Division of Rulemaking, Environmental, and Financial Support Office of Nuclear Material Safety and Safeguards ML25084A113 EAXX-429-00-000-1742871401 Environmental Assessment for the License Amendment for the American Centrifuge Plant in Piketon, Ohio Environmental Assessment Docket Number: 70-7004 Issued: June 2025
Environmental Center of Expertise Division of Rulemaking, Environmental, and Financial Support Office of Nuclear Material Safety and Safeguards
iii CONTENTS CONTENTS................................................................................................................... iii LIST OF TABLES.......................................................................................................... iv ABBREVIATIONS AND ACRONYMS............................................................................ v 1
INTRODUCTION...................................................................................................... 1 1.1 Background................................................................................................................. 1 1.2 Proposed Action.......................................................................................................... 1 1.3 Scope of Environmental Review................................................................................ 2 2
ENVIRONMENTAL IMPACTS................................................................................. 3 2.1 Air Quality.................................................................................................................... 3 2.2 Occupational Health and Safety................................................................................ 3 2.3 Transportation............................................................................................................. 5 2.4 Waste Management..................................................................................................... 5 3
ALTERNATIVES TO THE PROPOSED ACTION.................................................... 6 4
AGENCIES AND PERSONS CONSULTED............................................................ 7 4.1 National Historic Preservation Act............................................................................ 7 4.2 Endangered Species Act............................................................................................ 7 4.3 State and EPA Review................................................................................................. 8 5
CONCLUSION AND FINDING OF NO SIGNIFICANT IMPACT.............................. 9 6
LIST OF PREPARERS.......................................................................................... 10 7
REFERENCES....................................................................................................... 11
iv LIST OF TABLES TABLE 4-1 Endangered Species That May Be Present In The Area Of The Haleu Cascade.............. ERROR!
BOOKMARK NOT DEFINED.
v ABBREVIATIONS AND ACRONYMS ACO American Centrifuge Operating, LLC ACP American Centrifuge Plant CFR Code of Federal Regulations DOE Department of Energy EA Environmental Assessment EIS Environmental Impact Statement EPA Environmental Protection Agency ESA Endangered Species Act HALEU High Assay Low-Enriched Uranium HF Hydrogen Fluoride kg kilogram m3 cubic meter ml milliliter mrem millirem mSv microsieverts NHPA National Historic Preservation Act NRC Nuclear Regulatory Commission ODH Ohio Department of Health ODPS Ohio Department of Public Safety OSHA Occupational Safety and Health Administration SNM Special Nuclear Material SWU Separative Work Unit
µC microcurie U-235 uranium-235 UF6 Uranium Hexafluoride
µg micrograms USEC United States Enrichment Corporation yr year
1 1 INTRODUCTION
1.1 Background
By letter dated December 19, 2024, American Centrifuge Operating, LLC (ACO or the licensee) submitted an application to the U.S. Nuclear Regulatory Commission (NRC) to amend Special Nuclear Materials (SNM) License Number SNM-2011 (SNM-2011) for the American Centrifuge Plant (ACP) (ACO 2024c). The license amendment would allow ACO to continue operating the high-assay, low enriched uranium (HALEU) demonstration cascade until June 30, 2034, contingent upon the terms of ACOs contract with the U.S. Department of Energy (DOE), as discussed further below. The license amendment would also increase the possession limit for uranium hexafluoride (UF6) in support of the DOE-ACO contract production milestones of 900 kilograms (kgs) of HALEU per year. The NRC accepted the application for a detailed technical review (safety and environmental) on February 10, 2025 (NRC 2025a).
The NRC authorized the operation of the HALEU cascade at the ACP in Pike County, Ohio in June 2021 (NRC 2021). The NRC approved a license amendment to increase ACOs licensed material possession limits in September 2024 (NRC 2024a). In December 2024, the NRC approved continued operation for an additional 6 months to June 2025 (NRC 2024b).
ACO is producing HALEU for the DOE under a 3-phase demonstration contract. HALEU is uranium that has been enriched so that the concentration of the fissile isotope uranium-235 (U-235) is between 5 and 20 percent of the mass of the uranium. The project is currently in Phase II, and the proposed action is to approve operation for 9 additional years in Phase III, along with a possession limit increase to support continued operation during that time.
Phase III of the contract between the DOE and ACO is divided into three 3-year options which are at the sole discretion of the DOE to renew subject to the availability of Congressional appropriations. Based on availability of Congressional appropriates, the DOE has redefined option period 1 as being divided into three 1-year periods, with the first 1-year period funded to begin July 1, 2025 (ACO 2025b). ACO would be required to submit to the NRC the amended contract and funding assurance for each option period upon receipt from the DOE and at least 30-days prior to any anticipated change which are material to ACOs license. The NRC staff considered the environmental impacts associated with the NRCs review and approval of the financial documentation provided with ACOs license amendment request. The NRC staff finds that ACOs financial qualifications, decommissioning funding, and nuclear insurance indemnification are categorically excluded from environmental review under the NRCs regulations in Title 10 of the Code of Federal Regulations (10 CFR) Section 51.22(c)(10)(i),
which applies to a surety, insurance, and/or indemnity.
1.2 Proposed Action The proposed license amendment would allow ACO to continue operating the HALEU cascade for up to 9 additional years, split into 3 sets of 3-year option periods as defined in the DOEs HALEU contract (ACO 2024d). The DOE has deemed it appropriate to redefine the first 3-year period into three 1-year periods, with the first 1-year period funded starting July 1, 2025 (ACO 2025b). The full Phase III contract would allow ACO to operate the HALEU cascades at the site through June 30, 2034. Additionally, the proposed action includes an increase in possession
2 limit to support the continued operation through Phase III of the contract with DOE. Phase III operations are contingent upon Congressional appropriations and the DOE opting to implement all three 3-year periods of operations, and all 3 1-year option periods of period 1. This environmental assessment (EA) considers all 9 years of the full Phase III operations. If the DOE does not renew the contract with ACO for all three of the 3-year periods then operations may cease prior to June 30, 2034. However, operations would not continue past an early unforeseen cancellation of the contract or June 30, 2034, unless ACO submits a license amendment request to the NRC and the NRC approves it before the contract end date.
The proposed action does not include an increase in enrichment or production capacity (ACO 2024d). The increased possession limit is needed to store the feed, tails, and HALEU on site during Phase III. ACO does not propose to construct new buildings, conduct ground-disturbed activities, or ship HALEU offsite as part of Phase III.
1.3 Scope of Environmental Review ACO does not propose to change the HALEU cascade design, process, or number of operating centrifuges. HALEU operations, including storage of produced HALEU and tails, would continue to be performed within the currently leased buildings by existing staff in Piketon, Ohio. The proposed action would increase the possession limit, to allow for the storage of additional feed, tails, and HALEU on site, and extend operations a total of 9 years from June 30, 2025, until June 30, 2034. Therefore, because operations would continue entirely inside buildings using the current staffing, production rates, and storage capacity, the proposed action does not pose a potential for impact on the following resource areas: land use, historic and cultural resources, visual and scenic resources, geology and soils, water resources, ecological resources.
Additionally, the NRC staff conclude the proposed action would have no new impact on socioeconomics, noise, or public health and safety, except that the potential for previously assessed impacts would be extended by up to 9 years. These resources were all considered in the 2006 environmental impact statement (EIS) for the commercial ACP (NUREG-1834), 2021 EA for HALEU cascade, 2024 EA for possession limit increase, and 2024 EA for additional 6-month operating license (NRC 2006, NRC 2021, NRC 2024a, NRC 2024b). The proposed action does not alter the potential impacts considered previously and, therefore, these resource areas are not discussed further in this EA. This EA assesses the potential impacts of the proposed action on air quality, occupational health and safety, transportation, and waste management.
3 2 ENVIRONMENTAL IMPACTS 2.1 Air Quality The HALEU cascade operates within existing buildings enclosed with fencing and gates (ACO 2024d). The major non-radiological hazardous air emission from continued operation is hydrogen fluoride (HF). HF could result from the reaction of any moisture leakage into the cascade with the process gas in the form of UF6.
The maximally exposed individual was defined during the initial license review to be the Mobile Equipment Maintenance Shop within the DOE reservation, where the Ohio National Guard was located at the time (USEC 2005). The Ohio National Guard is no longer using the facility, but dose assessments continue to be based on this location as a conservative assumption (ACO 2020). The nearest current resident is the Ohio Valley Electric Corporation office building located on the West Access Road, which is further from the ACP than the Mobile Equipment Maintenance Shop, but still within the DOE reservation (ACO 2020). The average HF concentration at the Mobile Equipment Maintenance Shop was calculated to be 4.8e-9 micrograms (µg)/ cubic meter (m3) from July to December 2023 (ACO 2024d). From January 2024 to June 30, 2024, the concentration of HF was 2.4e-7 µg/m3 and from July 1 to December 31, 2024, the concentration of HF was 3.96e-7 µg/m3 (ACO 2024d; ACO 2025a). The proposed action would not include any increase in production rate or adding additional centrifuges to the cascade, therefore HF emissions would continue to remain many orders of magnitude below the Occupational Safety and Health Administration (OSHA) Permissible Exposure Limit (as an eight-hour average) of 2500 µg/m3 (OSHA 2025a).
Diesel generators would be used onsite to maintain power to essential systems in the event of power loss or interruption. ACO estimates the diesel generators would be operated for less than 500 hours0.00579 days <br />0.139 hours <br />8.267196e-4 weeks <br />1.9025e-4 months <br /> per year during the license term. The impact of diesel generators on non-radiological air quality would not be significant due to intermittent use.
The proposed action would not result in any new non-radiological air quality concerns and would not increase the release rate of HF, which is well below OSHAs Permissible Exposure Limit.
Therefore, the NRC staff conclude the proposed action would have no significant impact on air quality.
2.2 Occupational Health and Safety The primary non-radiological hazardous substances are fluorine and HF, which are stored and used in accordance with state regulations and permits (ACO 2024d). ACO takes precautions to avoid impacts from accidental discharges of fuel, waste, and sewage. HF emissions from the proposed increase in possession limits would likely not detectably increase from current HF emissions. The proposed license renewal for 9 years would not increase the rate of HF emissions but would allow for current levels to continue through Phase III until June 30, 2034.
As discussed under Air Quality, the current emission rate of HF is resulting in atmospheric concentrations near the location of the maximally exposed individual well below regulatory limits. Continued operation of the HALEU cascade would have no significant impact on non-radiological occupational health and safety.
4 The proposed action would not result in any significant change in effluent released offsite or significantly increase any individual or cumulative occupational radiation exposure. The effluent release rate is proportional to the production level, which the proposed action is not altering, rather than the possession limit or operation timeframe. The existing process building exhaust vents would remain unchanged and ensure the proposed action would not impact occupational exposure rates or total dose.
ACOs total radiological exposure to the nearest resident was 3.49e-8 millisieverts (mSv)
(3.49e-6 millirem [mrem]) from July 1, 2023, to December 31, 2023 (ACO 2024a). From January 1, 2024, to June 30, 2024, the dose was 1.6e-7 mSv (1.6e-5 mrem) (ACO 2024b). The gaseous release of uranium from the site was calculated by ACO to be 2.79e-18 µCi/mL, 1.95e-19
µCi/mL, and 6.31e-19 µCi/mL for U-234, U-235, and U-238, respectively (ACO 2025a). These concentrations of uranium at the site boundary are roughly six orders of magnitude below the NRC regulatory limit of 1e-12 µCi/mL for all three isotopes as defined in 10 CFR part 20 appendix B. The proposed action would increase the possession limit to allow ACO to store more feed, tails, and HALEU product, but does not alter the rate of production and therefore has no effect on the radiological air emissions. Continued operation of the HALEU cascade for an additional 9 years would likely result in the same, or nearly the same, emission rates. Therefore, the NRC staff concludes the proposed action would have no significant impact on radiological air emissions.
In its 2006 EIS, the NRC reviewed impacts of operation of the commercial ACP up to a production capacity of 7 million Separative Work Units (SWU) per year to enrich uranium up to a maximum of 10 percent U-235 (NUREG-1834). A SWU is the level of effort or energy required to raise the concentration of uranium-235 to a specified level and is an indicator of the amount of enriched uranium (NRC 2006). The same production capacity, 7 million SWU per year, would result in roughly 175,000 kg of 20 percent U-235 enriched HALEU, assuming 40 SWU/kg product is necessary to enrich one tonne natural uranium to 20 percent HALEU and 0.22 percent tails (WNA 2025). The 7 million SWU production capacity is more than the total operational capacity over the full 9 years of the proposed Phase III and is significantly larger than the 900 kg HALEU annual operational capacity of the proposed action, which would be roughly 36,000 SWU assuming 40 SWU/kg HALEU at 20 percent enrichment. The proposed action is in the same location as the commercial ACP reviewed in the NRCs 2006 EIS (NUREG-1834), on the DOE reservation in Piketon, Ohio. The NRC staff concluded in Section 4.2.12.3 of the EIS that for the 10 percent enrichment scenario at the commercial ACP, the expected maximum individual total effective dose equivalent at the Mobile Equipment Maintenance Shop would be 1.1e-2 mSv per year (mSv/yr) (1.1 millirem per yr). This is well below the U.S. Environmental Protection Agency National Emission Standards for Hazardous Air Pollutant limit of 0.1 mSv (10 mrem) and the NRC total effective dose equivalent limit of 1 mSv (100 mrem).
ACO submitted an effluent monitoring report for the period of July 1 through December 31, 2024, which shows ACO's total public exposure over that period was 2.6e-7 mSv (2.6e-05 millirem) (ACO 2025a). The proposed action does not include any alterations to the site operating capacity, thus the public dose would be expected to remain well below the regulatory limit of 1 mSv (100 mrem) in 10 CFR 20.1301. The proposed action is significantly smaller in scale than the commercial ACP and would implement a similar radiation protection program to limit occupational dose.
5 The NRC staff also considered the potential for any chemical toxicity effects to the workers and the public from uranium. ACO reported in the same effluent monitoring report for July 1 through December 31, 2024, that the average concentration of U-234, U-235, and U-238 at the process building vacuum vents were 2.93e-11 µCi/mL, 2.05e-12 µCi/mL, and 6.64e-12 µCi/mL, respectively (ACO 2025a). Based on the specific activity for each of the uranium isotopes, these concentrations equate to 4.7e-15 g/mL, 9.5e-13 g/mL, and 2.0e-11 g/mL, respectively. To put this concentration in perspective, the OSHA permissible exposure limit averaged over an 8-hour workday for soluble uranium compounds is 0.05 mg/m^3, which equates to 5e-11 g/mL (OSHA 2025b). Therefore, the uranium concentration at the process building evacuation vacuum vents is below OSHAs regulatory limits for occupational exposure. The concentration of uranium in the workplace and at the site boundary would be orders of magnitude lower than the concentration in the vent, therefore, the NRC staff concludes that there is no significant impact on the workers or public from any toxicological effects of uranium.
The possession limit increase could increase dose from increased storage of HALEU, tails, and feed cylinders and waste on site; however, it would remain well below regulatory limits in 10 CFR 20.1201. The NRC staff concluded the impacts from occupational exposure for the commercial ACP would be SMALL due to the use of the existing radiation protection program and that the ACO had established an administrative limit of 10 mSv (1,000 mrem), which is below the NRC limit in 10 CFR 20.1201 of 50 mSv (5,000 mrem) for occupational exposure (NRC 2006). The current HALEU operation utilizes the same administrative limit as the commercial ACP and is much smaller in scale. Therefore, the NRC staff concludes the proposed action would not significantly impact occupational health and safety.
2.3 Transportation ACO does not currently ship any HALEU or tails offsite, and the proposed action does not include any plans to add offsite shipments of HALEU or tails. The product and tails material is stored onsite in 5-series and 12-series cylinders. The proposed action includes continued operation of the HALEU cascade for 9 years to June 2034. Continued operations would require approximately two 30B fuel cylinders as feed material to be shipped to the site per year for a total of approximately 18 cylinders over 9 years. The DOE HALEU contract does not allow for shipments of product or tails. Instead, all cylinders are securely stored onsite in the process building. The potential impacts of transportation are bounded by previously assessed impacts in the 2021 HALEU cascade EA (NRC 2021). Therefore, the NRC staff conclude the proposed action would have no significant impact on transportation.
2.4 Waste Management The majority of the waste at the site is low-level waste comprising personal protective equipment and other non-fissile waste generated during routine maintenance and operations.
Based on current waste generation rates, ACO estimates seven B-25 boxes of low-level waste would be generated during each 3-year option period in Phase III, for a total of up to 21 B-25 boxes if the DOE opts to implement all 9 years of the contract. These boxes are stored on site in the process building.
6 The waste generation estimates of future waste generation during the proposed 9-year period of continued operations do not include any potential waste generated during decontamination or decommissioning of the facility, as this is the responsibility of the DOE.
Onsite sanitary wastewater is treated by a DOE contractor at the DOE reservation and other wastes are managed by existing DOE sitewide services. Waste is collected, packaged, and segregated for off-reservation disposal or treatment in accordance with applicable State and Federal regulations.
The proposed action would not result in any increase in waste shipments and the on-site storage of waste is largely low-level waste of personal protective equipment and other wastes generated during routine maintenance and operations. The continued waste storage would not significantly increase potential occupational dose. Therefore, the NRC staff conclude the proposed action would have no significant impact on waste management.
3 ALTERNATIVES TO THE PROPOSED ACTION As an alternative to the proposed action, the staff considered denial of the proposed action (i.e.,
the no-action alternative). Under the no-action alternative, ACO would cease operating the HALEU cascade on June 30, 2025, unless DOE extends the Phase II contract to allow operation beyond June 30 and ACOs possession limits approved by the NRC are not reached.
The no-action alternative could result in ACO being unable to meet the terms of its contract with DOE for Phase III operations. The no-action alternative would provide no environmental safety or protections compared to the proposed action. Therefore, the NRC staff concludes that denying the amendment request is not a reasonable alternative.
7 4 AGENCIES AND PERSONS CONSULTED 4.1 National Historic Preservation Act Section 106 of the National Historic Preservation Act (NHPA) requires Federal agencies to consider the effects of their undertakings on historic properties. The proposed action does not include any ground disturbing activities, would not increase any effluent release rates, introduce a new effluent release pathway, and does not expand the license control area. All the activities related to the proposed action would be inside of an already constructed building. Therefore, the proposed action is not a type of activity that has the potential to cause effects on any historic properties that may be present. Therefore, in accordance with Title 36 of the Code of Federal Regulations (36 CFR) Section 800.3(a)(1), the NRC has no further obligation under Section 106 of the NHPA. The NRC provided a courtesy notification of this proposed undertaking to the Ohio State Historic Preservation Office (NRC 2025b).
4.2 Endangered Species Act The U.S. Fish and Wildlife Service (FWS) and the National Marine Fisheries Service (NMFS) jointly administer the Endangered Species Act (ESA). The FWS manages the protection of, and recovery effort for, listed terrestrial and freshwater species, and the NMFS manages the protection of and recovery effort for listed marine and anadromous species. Section 7 of the Endangered Species Act (ESA) requires that, prior to taking a proposed action, Federal agencies determine whether the proposed Federal action may affect endangered or threatened species or their critical habitats.
Table 4.2 Endangered Species that May Be Present in the Area of the HALEU Cascade Name Status Mammals Northern long-eared bat Endangered Indiana bat Endangered Tricolored bat Proposed Endangered Clams Clubshell Endangered Northern Riffleshell Endangered Rayed Bean Endangered Salamander Mussel Proposed Endangered Insects Monarch Butterfly Proposed Threatened Using the FWS Information for Planning and Consultation (IPaC) database, the NRC staff generated a species list dated April 2025 for an action area comprising the FCS site and immediately adjacent lands (Table 4-1) (FWS 2025). The proposed action would not result in construction activities or land disturbance and would allow continuation of HALEU production activities that are already ongoing. Production and storage of HALEU occurs within existing buildings that formerly housed the LCF. The proposed action does not increase any effluent release rates or introduce any new effluent release pathways, nor does it expand the license control area. Consistent with guidance in NUREG-1748, the NRC staff has determined that even if endangered or candidate species are present in the vicinity of the HALEU cascade building on the DOE reservation, the proposed action would not affect such species or their habitats. Therefore, no consultation is required under Section 7 of the ESA.
8 4.3 State and EPA Review The NRC staff provided the draft EA to the Ohio Department of Health (OPH) and the Ohio Department of Public Safety (ODPS) on April 15, 2025 (NRC 2025c). The ODPS responded on April 15, 2025, that they have no comments on the draft EA and the ODH responded on April 21, 2025, that they have no comments on the draft EA (ODPS 2025; ODH 2025).
The NRC staff provided the draft EA to the EPA Region V Office for review concurrently with the state (NRC 2025d). EPA Region V responded on April 22, 2025, that they have no comments on the draft EA (EPA 2025).
9 5 CONCLUSION AND FINDING OF NO SIGNIFICANT IMPACT Based on its review of the proposed action, in accordance with the requirements of 10 CFR 51, the NRC staff has determined that amendment of NRC License SNM-2011, authorizing the operation of the HALEU cascade for an additional 9 years to June 30, 2034, and increasing possession limits to allow for continued operation of the cascade and continued storage of HALEU and tails on site, would not significantly affect the quality of the human environment.
Approval of the proposed action would not result in new construction. The NRC staff determined that under 10 CFR 51.31, the preparation of an EIS is not required for the proposed action.
Therefore, a Finding of No Significant Impact is appropriate under 10 CFR 51.32.
10 6 LIST OF PREPARERS Isaac Johnston, PhD, Office of Nuclear Materials Safety and Safeguards, NRC Christine Pineda, Office of Nuclear Materials Safety and Safeguards, NRC Mitchell Dehmer, Office of Nuclear Materials Safety and Safeguards, NRC
11 7 REFERENCES 10 CFR Part 51. Code of Federal Regulations, Title 10, Energy, Part 51, Environmental Protection Regulations for Domestic Licensing and Related Regulatory Functions.
36 CFR 800. Code of Federal Regulations, Title 36, Parks, Forests, and Public Property, Part 800 Initiation of the section 106 process.
ACO (American Centrifuge Operating). 2020. American Centrifuge Operating, LLC - License Amendment Request Application and Supporting Documents - Proposed Changes for LA-3605-0002, Environmental Report - Part 2 of 2. May 6, 2020. Piketon, Ohio. ML20139A097.
ACO (American Centrifuge Operating). 2024a. American Centrifuge Operating, LLC, Submittal of 10 Code of Federal Regulations 70.59 Effluent Reporting. February 29, 2024. Piketon, Ohio.
ACO (American Centrifuge Operating). 2024b. American Centrifuge Plant, Correction to Previous Submittal of 10 Code of Federal Regulations 70.59 Effluent Reporting. September 5, 2024. Piketon, Ohio. ML24253A175.
ACO (American Centrifuge Operating). 2024c. License Amendment Request for American Centrifuge Operating, LLC's License Application for the American Centrifuge Plant - Phase III of HALEU Operations. December 19, 2024. Piketon, Ohio. ML24366A040.
ACO (American Centrifuge Operating). 2024d. Enclosure 1 of ACO 24-0108, Detailed Description, Justification, and Significance Determination. December 19, 2024. Piketon, Ohio.
ACO (American Centrifuge Operating). 2025a. Submittal of 10 Code of Federal Regulations 70.59 Effluent Reporting. February 20, 2025. Piketon, Ohio ML25056A059.
ACO (American Centrifuge Operating). 2025b. Supplemental Proposed Changes License Application for the American Centrifuge Plant - Phase III of HALEU Operations. June 12, 2025.
Piketon, Ohio ML25164A029.
EPA (Environmental Protection Agency). 2025. Re: Request for EPA Review Draft EA for Proposed License Amendment for ACO HALEU Cascade at ACP. April 22, 2025. Chicago, Illinois. ML25114A164 FWS (U.S. Fish and Wildlife Service). 2025. Species List for American Centrifuge Operating HALEU Cascade at the ACP Site. Columbus, Ohio. April 10, 2025. ADAMS Accession No. ML25104A302.
NRC (U.S. Nuclear Regulatory Commission). 2006. NUREG-1834 Environmental Impact Statement for the Proposed American Centrifuge Plant in Piketon, Ohio. April 2006. Washington D.C. ML061250131.
NRC (U.S. Nuclear Regulatory Commission). 2021. Environmental Assessment for the Proposed Amendment of U.S. Nuclear Regulatory Commission License Number SNM-2011 for the American Centrifuge in Piketon, Ohio. June 7, 2021. Washington D.C. ML21085A705
12 NRC (U.S. Nuclear Regulatory Commission). 2024a. Environmental Assessment for Proposed License Amendment to Increase Possession Limits for Licensed Material for the HALEU Program at the American Centrifuge Plant, Piketon, Ohio. August 1, 2024. Washington D.C.
ML24254A206 NRC (U.S. Nuclear Regulatory Commission). 2024b. Environmental Assessment for Proposed Amendment to Allow American Centrifuge Operating to Continue HALEU Operations for an Additional Six Months. December 23, 2024. Washington D.C. ML24358A175 NRC (U.S. Nuclear Regulatory Commission). 2025a. NRC's Acceptance for Detailed Review of ACO's License Amendment Request for Phase III HALEU Operations at the ACP in Piketon, OH. February 10, 2025. Washington D.C. ML25042A390.
NRC (U.S. Nuclear Regulatory Commission). 2025b. Courtesy notification of NRC review of American Centrifuge License Amendment request. April 18, 2025. Washington, D.C.
NRC (U.S. Nuclear Regulatory Commission). 2025c. Request for State Review by May 15 Draft Environmental Assessment for Proposed License Amendment for ACO HALEU Cascade at ACP. April 15, 2025. Washington, D.C. ML25112A292.
NRC (U.S. Nuclear Regulatory Commission). 2025d. Request for EPA Review Draft EA for Proposed License Amendment for ACO HALEU Cascade at ACP. April 15, 2025. Washington, D.C. ML25112A289.
ODH (Ohio Department of Health). 2025. Re: Request for State Review by May 15 Draft Environmental Assessment for Proposed License Amendment for ACO HALEU Cascade at ACP. April 21, 2025. Columbus, Ohio. ML25112A298 ODPS (Ohio Department of Public Safety). 2025. Re: Request for State Review by May 15 Draft Environmental Assessment for Proposed License Amendment for ACO HALEU Cascade at ACP. April 15, 2025. Columbus, Ohio. ML25112A300.
OSHA (U.S. Occupational Safety & Health). 2025a. Hydrogen Fluoride
<https://www.osha.gov/chemicaldata/622> (Accessed February 25, 2025).
OSHA (U.S. Occupational Safety & Health). 2025b. Uranium, Soluble Compounds.
<https://www.osha.gov/chemicaldata/545> (Accessed April 25, 2025).
USEC (U.S. Enrichment Corp) 2005. Submittal of Additional Information Related to Requests for Additional Information Regarding the Environmental Report. July 29, 2005. Bethesda, MD.
WNA (World Nuclear Association). 2025. Nuclear Fuel Cycle Uranium enrichment <https://world-nuclear.org/information-library/nuclear-fuel-cycle/conversion-enrichment-and-fabrication/uranium-enrichment#:~:text=The%20unit%20'tonnes%20SWU'%20is%20also%20used.,of%2010.4%20k g%20of%20natural%20U%20feed> (Accessed February 25, 2025)