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D&D Dictionary

Popular deactivation and decommissioning terms and their definitions.

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Listing: T

    Toxic Substance Control Act

     TSCA was enacted was enacted in 1976 to protect human health and the environment from unreasonable risk due to exposure to, manufacture, distribution, use or disposal of substances containing toxic chemicals. For example, under TSCA, any hazardous waste that contains more than 50 parts per million of polychlorinated biphenyls (PCBs) are subject to regulations under this Act.

    Transfer of Facilities

     The process of transferring programmatic and financial responsibility of land and/or facilities from one Program Office to another.

    Transuranic Waste

    Waste that is contaminated with alpha-emitting transuranic nuclides with half-lives greater than 20 years and concentrations greater than 100 nanocuries per gram of waste. Contact-handled TRU waste does not require shielding and has a surface dose rate of less than 200 millirem per hour.


    A tank is a container for the storage or transportation of liquids, liquefied gases, or free-flowing substances, such as petroleum products, milk, or cement. Tanks can be placed underground, sunken or above ground.


    The application of scientific knowledge to solve practical problems, especially in industry and commerce.
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