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Administration Building
contains security and administration offices.
Auxiliary Building
houses equipment and laboratories for normal operation of the plant in addition to certain backup systems. The control room is in this building.
Condenser
is a large cooling system that changes steam that has spun the turbine back into water to be used again.
Containment Building
(or reactor building) is a steel and reinforced concrete structure. It houses the reactor, pressurizer, reactor coolant pumps, steam generators, piping, and other equipment.
Cooling Tower
is the tall hyperbolic reinforced concrete structure which is used to reject the waste heat from ANO-2 to the atmosphere.
Emergency Planning Zone (EPZ)
is a circle around Arkansas Nuclear One, having a ten mile radius with the plant site at the center. Most of the emergency planning concerning an incident at ANO is concentrated inside this zone. Please refer to the map.
Emergency Warning System
is a network of outdoor sirens and tone alert receivers used to tell the public that emergency information is about to be broadcast over local radio stations.
Entergy Arkansas, LLC,
a wholly owned subsidiary of Entergy Corporation, is the owner of Arkansas Nuclear One.
Entergy Corporation
is a publicly held holding company that is the sole owner of Entergy Arkansas, Inc. and Entergy Operations, Inc.
Fission
is the splitting of an atom into two new atoms. When a uranium atom splits, two new atoms, neutrons and heat are produced.
Millirem
is the unit used to measure radiation dosage. It is 1/1000th of a REM. REM stands for Roentgen Equivalent Man, a measure of radiation that indicates potential impact on human cells.
Moderator
is the material used to improve the efficiency of the fission process. Water is used as the moderator at Arkansas Nuclear One.
NOAA
is the National Oceanic and Atmospheric Administration.
Nuclear Fuel
is a slightly enriched uranium.
Nuclear Regulatory Commission (NRC)
is the federal governmental agency that is responsible for the regulation and inspection of nuclear power plants to assure safety.
Pressurizer
is the tank of steam and water that controls the pressure in the reactor system.
Primary Coolant
refers to water that is used to transfer the heat from the nuclear fuel to the secondary coolant.
Reactor
is a large steel vessel that contains the uranium fuel, primary coolant, control
rods, and structures that support the uranium fuel.
Reactor Coolant Pumps
are used to circulate the primary coolant water.
Secondary Coolant
is the non-radioactive water that is heated into steam which turns the turbine.
Shielding
is the material within the nuclear plant that prevents the escape of radiation. Shielding can be steel, lead, concrete, or water.
Steam Generator
is the piece of equipment that permits heat to be transferred from the primary coolant water to the secondary coolant without the water in the two systems actually mixing.
Steam Generator Tube
separates reactor coolant water from the water used to make steam. Thousands of tubes are housed in a steam generator.
Turbine
is a series of curved blades attached to a shaft and rotated by steam. The turbine is connected to the generator which produces electricity.
Turbine Building
contains the secondary (non-radioactive) system of water. Housed in this building are the steam turbines, the electric generator, and the condenser system.