A state resulting from an unusual incident in which operating parameters affecting control of radioactive materials move out of the normal operating range.
The energy deposited per unit mass by ionizing radiation. The unit of absorbed dose is the rad.
A measure of the quantity of pollutants in the air.
air quality standards
The prescribed quantity of pollutants in the outside air that cannot be exceeded legally during a specified time in a specified area.
alpha (a) particle
A positively charged particle consisting of two protons and two neutrons that is emitted from the nucleus of certain nuclides during radioactive decay. It is the least penetrating of the three common types of radiation (alpha, beta, and gamma).
The surrounding atmosphere, usually the outside air, as it exists around people, plants, and structures. It is not the air in immediate proximity to emission sources.
In liquid form (i.e., dissolved in water).
A geologic formation that contains sufficient saturated permeable material to conduct groundwater and to yield worthwhile quantities of groundwater to wells and springs.
The layer of air surrounding the earth.
A computer model that is used to analyze doses from accidental airborne radionuclide releases. Developed in accordance with U.S. Nuclear Regulatory Commission Regulatory Guide 1.145, Atmospheric Dispersion Models for Potential Accidental Consequence Assessments at Nuclear Power Plants, February 1993.
See exposure to radiation.
Normal radiation present in the lower atmosphere from cosmic rays and earth sources. Background radiation varies with location, depending on altitude and natural radioactivity present in the surrounding geology.
beta (b) particle
An elementary particle emitted from a nucleus during radioactive decay. It is negatively charged, is identical to an electron, and is easily stopped by a thin sheet of metal.
Producing greater or lesser consequences than other accidents; or would "bound" the remainder of the accidents.
A place for burying unwanted radioactive materials in which the earth acts to contain or prevent the escape of radiation. In this EIS, materials are incorporated into concrete to prevent the leaching of materials or movement in the underground environment.
Plutonium metal in a hemispherical shape, weighing about 1.8 kilograms (4 pounds).
Degree Celsius. °C = ° (°F - 32).
A malignant tumor of potentially unlimited growth, capable of invading surrounding tissue or spreading to other parts of the body by metastasis.
A stainless-steel container in which nuclear material is sealed.
A heavily shielded building used in the chemical processing of radioactive materials to recover special isotopes for national defense or other programmatic purposes. Operation and maintenance are by remote control.
Determination if a geological fault has moved at or near the ground surface within the past 35,000 years.
An agent capable of producing or inducing cancer.
Capable of producing or inducing cancer.
A heavily shielded massive container for holding nuclear materials during shipment.
Naturally occurring element with 55 protons in its nucleus. Some manmade isotopes of cesium are radioactive (e.g., cesium 134, cesium-137).
The material (generally aluminum in SRS reactors) that covers each tubular fuel and target assembly.
The sum of the individual doses to all members of a specific population.
committed effective dose equivalent
Used in cases when a person has an intake of radioactive material to denote that the dose is calculated for a period of 50 years following the intake. (See effective dose equivalent.)
community (environmental justice definition)
A group of people or a site within a spatial scope exposed to risks that potentially threaten health, ecology, or land values, or exposed to industry that stimulates unwanted noise, smell, industrial traffic, particulate matter, or other nonaesthetic impacts.
The amount of a substance contained in a unit quantity of a sample.
Liquid water obtained by cooling the steam (overheads) produced in an evaporator system.
Parts or components of a chemical system.
The process for changing special isotopes into usable chemical forms to satisfy current or projected needs for a unique product.
A state in which a self-sustaining nuclear chain reaction is achieved.
Additive environmental, health, and socioeconomic effects that result from a number of similar activities in an area.
A unit of radioactivity equal to 37,000,000,000 decays per second.
A nuclide formed by the radioactive decay of another nuclide, which is the "parent."
The spontaneous transformation of one nuclide into a different nuclide or into a different energy state of the same nuclide. The process results in the emission of nuclear radiation (alpha, beta, or gamma radiation).
The removal from service of facilities such as processing plants, waste tanks, and burial grounds, and the reduction or stabilization of radioactive contamination. Decommissioning concepts include:
- Decontaminate, dismantle, and return area to original condition without restrictions.
- Partially decontaminate, isolate remaining residues, and continue surveillance and restrictions.
Nuclear waste generated by government defense programs as distinguished from waste generated by commercial and medical facilities.
A mixture of uranium isotopes where uranium-235 represents less than 0.7 percent of the uranium by mass.
design-basis accident (DBA)
A postulated accident scenario for establishing the need for certain design features; normally, the accident that causes the most severe consequence when engineered safety features function as intended.
After designation as "surplus"; movement; placement in an onsite or offsite facility after a decision that future uses are unlikely or undesirable; determining whether the disposal of items must be "retrievable" under public law.
The radiation dose delivered per unit time (e.g., rem per year).
The science dealing with the relationship of all living things with each other and with the environment.
A complex of the community of living things and the environment forming a functioning whole in nature.
effective dose equivalent
A quantity used to estimate the biological effect of ionizing radiation. It is the sum over all body tissues of the product of absorbed dose, the quality factor (to account for the different penetrating ability of the various radiations), and the tissue weighting factor (to account for the different radiosensitivity of the various tissues of the body).
Liquid or airborne material released to the environment. In general usage, however, "effluent" implies liquid releases.
Defined limits of effluent in terms of volume, content of contaminants, temperature, etc.
Environmental impact statement, a legal document required by the National Environmental Policy Act (NEPA) of 1969, as amended, for Federal actions involving potentially significant environmental impacts.
One of the 105 known chemical substances that cannot be divided into simpler substances by chemical means. All isotopes of an element have the same atomic number (number of protons) but have a different number of neutrons.
Emergency Response Planning Guidelines (ERPG)
Values used to determine potential health effects from chemical accidents.
Legally enforceable limits on the quantities and kinds of air contaminants that can be emitted into the atmosphere.
Plants and animals in an area that are threatened with either extinction or serious depletion.
The capacity to produce heat or do work.
The sum of all external conditions and influences affecting the life, development, and ultimately the survival of an organism.
The point on the earth's surface directly above the focus of an earthquake.
A computer model used to estimate the airborne concentration of toxic chemicals as a result of routine or accidental releases to the environment.
The process in which the actions of wind or water carry away soil and clay.
A value over a prescribed limit.
exposure to radiation
The incidence of radiation on living or inanimate material by accident or intent. Background exposure is the exposure to natural background ionizing radiation. Occupational exposure is the exposure to ionizing radiation that occurs at a person's workplace. Population exposure is the exposure to a number of persons who inhabit an area.
Degree Fahrenheit. F = °C ¥ + 32.
The descent to earth and deposition on the ground of particulate matter (that might be radioactive) from the atmosphere.
A fracture or a zone of fractures within a rock formation along which vertical, horizontal, or transverse slippage of the earth's crust has occurred in the past.
Capable of being split or divided (fissioned) by the absorption of thermal neutrons. The most common fissile materials are uranium-233, uranium-235, and plutonium-239.
The splitting of a heavy nucleus into two approximately equal parts, which are nuclei of lighter elements, accompanied by the release of energy and generally one or more neutrons. Fission can occur spontaneously or can be induced by nuclear bombardment.
Nuclei from the fission of heavy elements (primary fission products); also, the nuclei formed by the decay of the primary fission products, many of which are radioactive.
Level land built up by flowing stream deposition and periodically submerged by floodwater from that stream.
Finely ground glass.
gamma (g) rays
High-energy, short-wavelength electromagnetic radiation accompanying fission, radioactive decay, or nuclear reactions. Gamma rays are very penetrating and require relatively thick shields to absorb the rays effectively.
The science that deals with the earth: the materials, processes, environments, and history of the planet, especially the lithosphere, including the rocks, their formation and structure.
Large enclosure that separates workers from equipment used to process hazardous material but enables the workers to be in physical contact with the equipment; normally constructed of stainless steel with large acrylic/lead glass windows. Workers have access to equipment through the use of heavy-duty, lead-impregnated rubber gloves, the cuffs of which are sealed in portholes in the glovebox windows.
The supply of fresh water under the earth's surface in an aquifer.
The place or type of site where a plant or animal naturally or normally lives and grows.
The time in which half the atoms of a radioactive substance disintegrate to another nuclear form. Half-lives vary from millionths of a second to billions of years.
Metallic elements of high molecular weight, such as mercury, chromium, cadmium, lead, and arsenic, that are toxic to plants and animals at known concentrations.
High efficiency particulate air filter designed to remove 99.9 percent of particles as small as 0.3 micrometer in diameter from a flowing air stream.
Oxide chemical form of plutonium produced by heating the material to approximately 1,000·C. High-fired oxide is considered more chemically stable than low-fired oxide because the higher heat removes moisture and other impurities more effectively.
The highly radioactive wastes that result from processing of defense materials at SRS.
The sites, districts, structures, and objects considered limited and nonrenewable because of their association with historic events, persons, or social or historic movements.
Conversion of high-level waste into a form that will be resistant to environmental dispersion.
A numerical rating used to describe the effects of earthquake ground motion on people, structures, and the earth's surface. The numerical rating is based on an earthquake intensity scale such as the Richter Scale commonly used in the United States.
Safe and secure capacity in the near term to support continuing operations in the interim period (10 years).
For this EIS, an SRS worker who is involved in the operation of a facility when a radioactive release occurs.
An atom or molecule that has gained or lost one or more electrons to become electrically charged.
Process in which a solution containing soluble ions to be removed is passed over a solid ion-exchange medium, which removes the soluble ions by exchanging them with labile ions from the surface of the column. The process is reversible so that the trapped ions can be collected (eluted) and the column regenerated.
A substance (e.g., a resin) that preferentially removes certain ions from a solution.
The process that creates ions. Nuclear radiation, X-rays, high temperatures, and electric discharges can cause ionization.
Radiation capable of displacing electrons from atoms or molecules to produce ions.
Exposure to radiation.
A computerized dispersion program used to calculate ground-level concentrations of air pollutants.
An atom of a chemical element with a specific atomic number and atomic weight. Isotopes of the same element have the same number of protons but different numbers of neutrons. Isotopes are identified by the name of the element and the total number of protons and neutrons in the nucleus. For example, plutonium-239 is a plutonium atom with 239 protons and neutrons.
A computer program used to calculate individual and population doses from liquid pathways.
latent cancer fatalities
Deaths resulting from cancer that has become active following a latent period (i.e., a period of inactivity).
Oxide chemical form of plutonium produced by heating the material to approximately 550·C. Low-fired oxide is considered less chemically stable than high-fired oxide because the lower heat does not remove moisture and other impurities as effectively.
A community where 25 percent or more of the population is identified as living in poverty.
Radioactive waste not classified as high-level waste; the wastes (mostly salts) remaining after removal of the highly radioactive nuclides from the liquid high-level wastes for immobilization.
An historic naming system for a specific design of fuel or target material used in SRS production reactors (e.g., Mk-31, Mk-42, Mk-16).
A computer program used to calculate doses of airborne releases of radioactivity to the maximally exposed member of the public.
maximum contaminant levels (MCLs)
The maximum permissible level of a contaminant in water that is delivered to a user of a public water system.
maximally exposed individual
A hypothetical person located to receive the maximum possible dose by a given exposure scenario.
The natural travel of a material through the air, soil, or groundwater.
To take practicable means to avoid or minimize environmental harm from a selected alternative.
Continuing control and accountability, particularly of special nuclear materials such as plutonium-239 and highly enriched uranium, but also including oversight of hazardous or reactive compounds before they are disposed of or converted to a stable long-term storage form.
National Register of Historic Places
A list maintained by the National Park Service of architectural, historic, archaeological, and cultural sites of local, state, or national importance.
natural radiation or natural radioactivity
Background radiation. Some elements are naturally radioactive, whereas others are induced to become radioactive by bombardment in a reactor or accelerator.
National Environmental Policy Act of 1969 (42 USC 4321); it requires the preparation of an EIS for Federal projects that could present significant impacts to the environment.
The restriction of ability to easily access fissile materials in concentrations sufficient to assemble a nuclear weapon.
Oxides of nitrogen, primarily nitrogen oxide (NO) and nitrogen dioxide (NO2). These are produced in the combustion of fossil fuels, and can constitute an air pollution problem.
Nuclear Regulatory Commission; the independent Federal commission that licenses and regulates nuclear facilities.
The energy liberated by a nuclear reactor (fission or fusion) or by radioactive decay.
Radiation, usually alpha, beta, or gamma, that emanates from an unstable atomic nucleus.
An interaction between a photon, particle, or nucleus and a target nucleus, leading to the emission of one or more particles and photons.
A device in which a fission chain reaction is maintained, used for the irradiation of materials or the generation of electricity.
An atomic nucleus specified by atomic weight, atomic number, and energy state; a radionuclide is a radioactive nuclide.
Chemical compounds containing carbon.
Place where liquid effluents enter the environment and are monitored.
A compound in which an element chemically combines with oxygen.
A compound of oxygen in which three oxygen atoms are chemically attached to each other.
Solid particles and liquid droplets small enough to become airborne.
passive safety system
A system that provides safety features requiring no human intervention or adverse condition to actuate.
A measure of the hydrogen ion concentration in aqueous solution. Pure water has a pH of 7, acidic solutions have a pH less than 7, and basic solutions have a pH greater than 7.
people of color communities
A population classified by the U.S. Bureau of the Census as Black, Hispanic, Asian and Pacific Islander, American Indian, Eskimo, Aleut, and other nonwhite persons, the composition of which is at least equal to or greater than the state minority average of a defined area or jurisdiction.
Ability of liquid to flow through rock, groundwater, soil, or other substance.
The radiation dose to a given population; the sum of the individual doses received by a population segment.
Geographic regions based on geologic setting.
A transuranic, heavy (average atomic mass about 244 atomic mass units), silvery metal with 15 isotopes that is produced by the neutron irradiation of natural uranium. Plutonium-239 is used both in nuclear weapons and commercial nuclear power applications. Plutonium-238 is used to power onboard generators during manned and unmanned space flights.
Chemical solutions containing plutonium.
A material that has an affinity for absorbing neutrons. Poisons are added to nuclear materials with a potential criticality concern to lessen the likelihood of an uncontrolled nuclear reaction.
The addition of an undesirable agent to an ecosystem in excess of the rate at which natural processes can degrade, assimilate, or disperse it.
A computer mathematical model used to calculate doses of airborne releases of radioactivity to the population within 80 kilometers (50 miles) of the SRS.
In this EIS, a collection of members of the public who are located outside the boundaries of the SRS. Impacts in this EIS are estimated for the population within a given area, depending on the appropriate environmental pathways. For example, the affected population for liquid releases to the Savannah River includes downstream residents.
A solid (used as a noun). To form a solid substance in a solution by a chemical reaction (used as a verb).
A chemical separation process to retrieve plutonium, uranium, and other radionuclides from reactor fuel and targets.
The emitted particles and photons from the nuclei of radioactive atoms; a shortened term for ionizing radiation or nuclear radiation as distinguished from nonionizing radiation (microwaves, ultraviolet rays, etc.).
The spontaneous decay of unstable atomic nuclei, accompanied by the emission of radiation.
Radioactive isotopes. Some radioisotopes are naturally occurring (e.g., potassium-40) while others are produced by nuclear reactions.
The decomposition of a material (usually water) into different molecules due to ionizing radiation. In water, radiolysis results in the production of hydrogen gas and oxygen.
A place for the disposal of immobilized high-level waste in isolation from the environment.
An ion-exchange medium; organic polymer used for the preferential removal of certain ions from a solution.
A scale of measure used in the United States to quantify earthquake intensity.
In accident analysis, the probability weighted consequence of an accident, defined as the accident frequency per year multiplied by the dose. The term "risk" is also used commonly in other applications to describe the probability of an event occurring.
The portion of rainfall, melted snow, or irrigation water that flows across ground surface and eventually returns to streams. Runoff can carry pollutants into receiving waters.
Low-radioactivity fraction of high-level waste from the in-tank precipitation process mixed with cement, flyash, and slag to form a concrete block.
The tendency for earthquakes to occur.
Material used to reduce the intensity of radiation that would irradiate personnel or equipment.
A designation for radionuclides with relatively short half-lives (i.e., they decay to stable materials relatively quickly).
The action of making a nuclear material more stable by converting its physical or chemical form or placing it in a more stable environment.
A vertical pipe or flue designed to exhaust gases and suspended particulates.
Naturally occurring element with 38 protons in its nucleus. Some manmade isotopes of strontium are radioactive (e.g., strontium-89, strontium-90),
All water on the surface (streams, ponds, etc.), as distinguished from underground water.
An installation of interconnected underground tanks for the storage of high-level radioactive liquid wastes.
In this EIS, a tube of material placed in a reactor to absorb neutrons and be changed to a desired end product.
Waste material containing more than a specified concentration of transuranic elements (presently, more than 10 nanocuries per gram of waste).
A radioactive isotope of hydrogen; its nucleus contains one proton and two neutrons.
For this EIS, an SRS worker who is not involved in the operation of a facility when a radioactive release occurred, and who is assumed to be 640 meters (2,100 feet) from the point of release.
A heavy (average atomic mass of about 238 atomic mass units), silvery-white metal with 14 radioactive isotopes. One of the isotopes, uranium-235, is most commonly used as fuel for nuclear fission and another, uranium-238, is transformed into fissionable plutonium-239 following its capture of a neutron in a nuclear reactor.
A reinforced concrete structure for storing strategic nuclear materials used in national defense or other programmatic purposes.
Incorporation of a material into a glass form.
Condition or weakness that could lead to exposure to the public, unnecessary or increased exposure to workers, or release of radioactive materials to the environment.
Materials from nuclear operations that are radioactive or are contaminated with radioactive materials and for which there is no practical use or for which recovery is impractical.
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