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Executive Summary DOE/PPPO/03-0862&D1 FBP-ER-RCRA-WD-RPT-0288 Revision 3 January 2019 EXECUTIVE SUMMARY PURPOSE This Annual Site Environmental Report is prepared to summarize environmental monitoring and compliance activities conducted at the U.S. Department of Energy (DOE) Portsmouth Gaseous Diffusion Plant (PORTS) for calendar year 2017. Environmental monitoring is conducted to assess the impact, if any, that site operations may have on public health and the environment. The report fulfills a requirement of DOE Order 231.1B, Environment, Safety and Health Reporting, for preparation of an annual summary of environmental data to characterize environmental management performance. The Annual Site Environmental Report also provides the means by which DOE demonstrates compliance with the radiation protection requirements of DOE Order 458.1, Radiation Protection of the Public and the Environment. SITE AND OPERATIONS OVERVIEW PORTS, which produced enriched uranium via the gaseous diffusion process from 1954 to 2001, is one of three uranium enrichment facilities originally built in the United States; the other two were constructed in Oak Ridge, Tennessee and Paducah, Kentucky, respectively. PORTS is located on 5.9 square miles in Pike County, Ohio. The county has approximately 28,270 residents (U.S. Census Bureau 2018). DOE is responsible for decontamination and decommissioning (D&D) of the gaseous diffusion process buildings and associated facilities, environmental restoration, waste management, depleted uranium hexafluoride (DUF6) conversion, and management of other non-leased facilities at PORTS. DOE contractors Fluor-BWXT Portsmouth LLC (FBP), Portsmouth Mission Alliance, LLC (PMA), Mid-America Conversion Services, LLC (MCS), and BWXT Conversion Services, LLC (BWCS) managed DOE programs at PORTS in 2017. FBP was responsible for the following activities: • D&D of the former gaseous diffusion process building and associated facilities; • environmental restoration of contaminated areas; • monitoring and reporting on environmental compliance; • disposition of legacy radioactive waste; • uranium management; and • operation of the site’s waste storage facilities. PMA was responsible for the following facility support services: • computer and telecommunications services; • security; • training; • records management; • fleet management; • non-nuclear facility preventive and corrective maintenance; • grounds and road maintenance; • snow removal; and • janitorial services. BWCS was responsible for operations associated with the DUF6 Conversion Facility through January 2017. On February 1, 2017 MCS assumed responsibility for the DUF6 Conversion Facility including surveillance and maintenance of DUF6 cylinders, and environmental compliance and monitoring activities ES-1 FBP / 2017 ASER 1/24/2019 DOE/PPPO/03-0862&D1 FBP-ER-RCRA-WD-RPT-0288 Revision 3 January 2019 associated with operation of the DUF6 Conversion Facility. DUF6, which is a product of the uranium enrichment process, is stored in cylinders on site. The DUF6 Conversion Facility converts DUF6 into uranium oxide and aqueous hydrogen fluoride. The uranium oxide is made available for beneficial reuse, storage, or disposal, and the aqueous hydrogen fluoride is sold for reuse. Centrus Energy Corp. (Centrus), formerly USEC, Inc., continues to lease facilities at PORTS that were intended for the development of a gaseous centrifuge uranium enrichment facility – the American Centrifuge Plant (ACP). The project has been shut down, and D&D of the demonstration cascade associated with the project began in 2016. With the exception of Chapter 2, Compliance Summary; Chapter 4, Environmental Radiological Program Information; and Chapter 5, Environmental Non-Radiological Program Information, this report does not cover Centrus operations at PORTS because their operations are not subject to DOE Orders. Centrus data are included in these chapters to provide a more complete picture of the operations in place at PORTS to detect and assess potential impacts to human health and the environment resulting from PORTS activities. ENVIRONMENTAL MONITORING AND RADIOLOGICAL DOSE SUMMARY Extensive environmental monitoring is completed at PORTS to comply with environmental regulations, permit requirements, and DOE Orders, and assess the impact, if any, that site operations may have on public health and the environment. The Environmental Monitoring Plan for the Portsmouth Gaseous Diffusion Plant (DOE 2017b) describes the DOE environmental monitoring programs at PORTS, with the exception of groundwater monitoring. Groundwater monitoring, which also includes related surface water monitoring and residential water supply monitoring, is described in the Integrated Groundwater Monitoring Plan for the Portsmouth Gaseous Diffusion Plant (DOE 2017d). Environmental monitoring includes the collection of samples of air, water, soil, sediment, and biota (vegetation, deer, fish, crops, milk, and eggs). Samples are collected at varying frequencies (weekly, monthly, quarterly, annually, or biennially). In 2017, environmental monitoring information was collected for the following programs: • ambient air • external radiation • discharges to surface water • local surface water • sediment • soil • biota (vegetation, deer, fish, crops, milk, and eggs) • groundwater. Samples are analyzed for radionuclides, metals, and/or other chemicals that could be present in the environment due to PORTS activities, although many of these analytes also occur naturally or can be present due to human activities not related to PORTS. Over 3000 samples from these programs are collected on an annual basis. Potential impacts on human health from radionuclides released by PORTS operations are calculated based on environmental monitoring data. This impact, if any, is calculated in terms of a dose. A dose can be caused by radionuclides released into the air and/or water, or radiation emanating directly from buildings or other objects at PORTS. PORTS complies with the following dose limits: • The U.S. Environmental Protection Agency (U.S. EPA) has established a dose limit of 10 millirem (mrem)/year from radionuclides released to the air in Title 40 of the Code of Federal Regulations ES-2 FBP / 2017 ASER 1/24/2019 DOE/PPPO/03-0862&D1 FBP-ER-RCRA-WD-RPT-0288 Revision 3 January 2019 (CFR), Part 61, National Emission Standards for Hazardous Air Pollutants (NESHAP), Subpart H, National Emission Standards for Emissions of Radionuclides Other Than Radon from DOE Facilities (40 CFR Part 61, Subpart H). • The DOE has established a dose limit for members of the general public in DOE Order 458.1, which is as low as reasonably achievable1, but no more than 100 mrem/year for the dose from radionuclides from all potential pathways of exposure including inhalation, ingestion of water and soil/sediments, consumption of food, and direct external radiation. To aid in comparing sampling results for air and water to the 100 mrem/year dose limit, the 100 mrem/year limit is converted into a derived concentration standard (DOE 2011a). The derived concentration standard is the concentration of a radionuclide in air or water that under conditions of continuous exposure for one year by one exposure mode (ingestion of water or inhalation of air) would result in a dose of 100 mrem. A concentration of 100% of the derived concentration standard would equate to a dose at the DOE limit of 100 mrem/year. Environmental monitoring data collected in 2017 are consistent with data collected in previous years and indicate that radionuclides, metals, and other chemicals released by PORTS operations have a minimal effect on human health and the environment. The following sections summarize the results of environmental monitoring conducted at PORTS in 2017: Ambient air. Radionuclides in ambient air are monitored at 15 monitoring stations that are located on site, at the site perimeter, within the local area, and west of PORTS in an area not potentially impacted by PORTS operations (the background location). Samples are analyzed monthly or quarterly for radionuclides that can be associated with PORTS operations. These radionuclides are transuranics (manmade elements greater than atomic number 92 [americium-241, neptunium-237, plutonium-238, plutonium-239/240]), a fission product (technetium-99), uranium, and uranium isotopes (uranium- 233/234, uranium-235/236, and uranium-238). Uranium, uranium isotopes, neptunium-237, and technetium-99 were detected at the ambient air monitoring stations in 2017. The highest levels of each radionuclide in air were 0.08% or less of the DOE derived concentration standards (DOE 2011a). Maximum activities of detected radionuclides were located at stations A41A (Zahns Corner) and A36 (on site near the X-611 Water Treatment Plant) and are listed below (in picocurie per cubic meter [pCi/m3]): Radionuclide Maximum activity Location Derived Concentration Percentage (pCi/m3) Standard (DCS) (DOE 2011a) of DCS Neptunium-237 0.00015 A41A 0.18 0.08% Technetium-99 0.0077 A36 920 0.0008% Uranium-233/234 0.00025 A36 1.1 0.02% Uranium-238 0.00017 A36 1.3 0.01% 1 “As low as reasonably achievable” is an approach to radiation protection to manage and control releases of radioactive material to the environment, the workforce, and members of the public so that levels are as low as reasonable, taking into account societal, environmental, technical, economic, and public policy considerations. As low as reasonably achievable is not a specific release or dose limit, but a process that has the goal of optimizing
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