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D&D Dictionary

Popular deactivation and decommissioning terms and their definitions.

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Listing: E


     The detailed specification of conditions to be achieved for a facility’s spaces, systems and major equipment. Fundamental to the determination of end points is risk reduction through elimination or stabilization of hazards, effective facility containment and facility monitoring and control.

    Environmental Assessment

     A written environmental analysis which is prepared pursuant to National Environmental Policy Act to determine whether a federal action would significantly affect the environment and thus require preparation of a more detailed environmental impact statement.

    Environmental Impact Statement (EIS)

     A document required for Federal Agencies by the National Environmental Policy Act for major project or legislative proposals significantly affecting the environment. A tool for decision making, it describes the positive and negative effects of the undertaking and lists alternative actions.

    Environmental Remediation

    Cleanup and remediation of sites contaminated with radioactive and/or hazardous substances during past DOE production activities.


    A fundamental entity of nature that is transferred between parts of a system in the production of physical change within the system and usually regarded as the capacity for doing work.


     An electrical conductor through which an electric current enters or leaves a conducting medium, whether it be an electrolytic solution, solid, molten mass, gas, or vacuum. It is used to make contact with a non-metallic part of the circuit.

    End Effectors

    A device at the end of the robotic arm, designed to interact with the environment. The exact nature of the device depends on the application of the robot.

    Electrode Heater

    Electrical heating equipment without a chamber, in which a charge is heated by an electrode. Commonly used for heating water, an electrode heater does not use wire-wound resistance; the liquid itself acts as the resistance.
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