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D&D Dictionary

Popular deactivation and decommissioning terms and their definitions.

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    Acid Digestion

    A method to undergo analysis. Acid is added to the metal sample and heated until it appears the solid metal has fully dissolved. This sample can then be diluted down with an acid/water mixture and analyzed against an acid/water background solution for comparison.

    Administrative Record

    A collection of documents established in compliance with the requirements set forth in section 113(k) of CERCLA, as amended, consisting of information upon which the CERCLA lead agency bases its decision on the selection of response actions.

    Agreement State

     Any State with which the U.S. Nuclear Regulatory Commission has entered into an agreement giving the State authority to regulate radioactive materials covered by the agreement in accordance with Section 274.b of the Atomic Energy Act of 1954, as amended.


     An acronym for “As Low As Reasonably Achievable,” which means making every reasonable effort to maintain exposures to ionizing radiation as far below the dose limits as practical, consistent with the purpose for which the licensed activity is undertaken, taking into account the state of technology, the economics of improvements in relation to the state of technology, the economics of improvements in relation to benefits to the public health and safety, and other societal and socioeconomic considerations, and in relation to utilization of nuclear energy and licensed materials in the public interest.

    Applicable or Relevant and Appropriate Requirements (ARARs)

    (1) Those cleanup standards, standards of control, and other substantive requirements, criteria, or limitations promulgated under federal environmental, state environmental, or facility siting laws that specifically address a hazardous substance, pollutant, contaminant, remedial action, location, or other circumstance found at a CERCLA site.


     A set of six naturally occurring silicate minerals exploited commercially for their desirable physical properties. Asbestos is commercially used because of its important features like sound absorption, average tensile strength, and its resistance to heat, electrical and chemical damage.

    Atomic Energy Act

     The Act (1954) which placed production and control of nuclear materials within a civilian agency, originally the Atomic Energy Commission, now the Department of Energy.

    Atomic Reactor

     A kind of furnace used in nuclear power stations, where nuclear energy is transformed into heat energy.

    Authorization Basis:

     Those aspects of the facility design basis and operational requirements relied upon by DOE to authorize operation. They are considered to be important to the safety of facility operations. The authorization basis is described in documents such as the facility Safety Analysis Report and other safety analyses, Hazard Classification Documents, Technical Safety Requirements, DOE-issued safety evaluation reports, and facility-specific commitments made in order to comply with DOE Orders or policies.


     A line that serves as the basis for measurements or for construction. Also, it can be an initial set of critical observations or data used for comparison or control.
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