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D&D Dictionary

Popular deactivation and decommissioning terms and their definitions.

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Listing: N

    National Contingency Plan (NCP)

     A short title for the National Oil and Hazardous Substances Pollution Contingency Plan. The NCP, 40 CFR Part 300, outlines the responsibilities and authorities for responding to releases into the environment of hazardous substances and other pollutants and contaminants under the statutory authority of CERCLA and section 311 of the Clean Water Act.

    National Emission Standards for Hazardous Air Pollutants (NESHAPs)

     The Clean Air Act establishes limits on the release of hazardous pollutants for which no ambient air quality standard is applicable. Under the March 7, 1989 proposed ruling NESHAPs will also address radioactive releases to the air.

    National Environmental Policy Act of 1969

     The Act which established the requirements for conducting environmental reviews of Federal actions that have the potential for significant impact on the human environment.

    National Priorities List (NPL)

     The Environmental Protection Agency's list of the most serious uncontrolled or abandoned hazardous waste sites identified for possible long-term remedial action under CERCLA (Superfund). A site must be on the NPL to receive money from the Trust Fund for remedial action.

    National Response Center:

    The National Communications Center, located at U.S. Coast Guard Headquarters, continuously manned for handling activities related to CERCLA response actions. The National Response Center acts as the single point of contact for all pollution incident reporting, and as the National Response Team Communications Center.

    Natural Resource Trustees

     Federal officials designated by the President to act on behalf of the public as trustees for natural resources when there is injury to, destruction of, loss of, or threat to natural resources as a result of a release of a hazardous substance or a discharge of oil.

    Non-nuclear Facility

     Those activities, processes, or operations that may involve hazardous substances in such forms or concentration that a potential danger exists to cause illness, injury, or death to personnel within the facility site boundary or members of the public.

    Non-time-critical Removal Action

     This is a type of response action recognized by the U.S. Environmental Protection Agency appropriate for addressing hazardous substance threats where a planning horizon of six months or more is appropriate. Removal responses, including non-time-critical removals, are the subject of 40 CFR 300.

    Nuclear Facility

     Those activities, processes, or operations that involve radioactive materials or fissionable materials in such form, quantity, or concentration that a nuclear hazard potentially exists to the employees or general public.


     A tool for cutting sheet metal with minimal variation. Nibblers can be manually handled or powered. Power nibblers are powered by compressed air.
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