Half-Life (Radiological)

DOE-HDBK-XXXX-2005

06/30/2005

84. HALF-LIFE (RADIOLOGICAL). The time in which one half of the atoms of a particular

radionuclide disintegrate into another nuclear form. Half-lives for specific radionuclides vary

from millionths of a second to billions of years. [Derived from NRC Glossary]

85. HAZARD ANALYSIS. The assessment of hazardous situations potentially associated with a

process or activity. It includes the identification of material, system, process, and plant

characteristics that can produce undesirable consequences. A safety analysis report hazard

analysis examines the complete spectrum of potential accidents that could expose members of

the public, onsite workers, facility workers, and the environment to hazardous materials. (See

safety analysis report.) [Derived from DOE-STD-3009-94, DOE G 420.1-X]

86. HAZARDOUS AIR POLLUTANTS (HAPS). Air pollutants not covered by ambient air

quality standards but which may present a threat of adverse human health effects or adverse

environmental effects. Those specifically listed in 40 CFR 61.01 are asbestos, benzene,

beryllium, coke oven emissions, inorganic arsenic, mercury, radionuclides, and vinyl chloride.

More broadly, HAPs are any of the 189 pollutants listed in or pursuant to section 112(b) of the

Clean Air Act. Very generally, HAPs are any air pollutants that may realistically be expected

to pose a threat to human health or welfare. [Derived from EPA Terms, 40 CFR 61.01, 40

CFR 63.2]

87. HAZARDOUS WASTE. A category of waste regulated under the Resource Conservation and

Recovery Act (RCRA). To be considered hazardous, a waste must be a solid waste under

RCRA and must exhibit at least one of four characteristics described in 40 CFR 261.20 through

40 CFR 261.24 (i.e., ignitability, corrosivity, reactivity, or toxicity) or be specifically listed by

the Environmental Protection Agency in 40 CFR 261.31 through 40 CFR 261.33.

Source, special nuclear, or by-product materials as defined by the Atomic Energy Act are not

hazardous waste because they are not solid waste under RCRA.

(See characteristic waste, Resource Conservation and Recovery Act, solid waste, and waste

characterization.)

[Derived from 40 CFR 261]

88. HEAVY-HAUL TRUCK. A truck that exceeds normally applicable vehicle weight limits for

highway travel. State authorities may issue special permits allowing trucks to exceed weight

limits in order to carry "nondivisible loads", such as spent nuclear fuel casks, on public

highways. Roadways and bridges may need to be upgraded in order to carry such vehicles.

(See legal-weight truck.)

It may be appropriate to append information specific to the particular document, such as:

As used in this environmental impact statement, heavy-haul truck means a truck with a gross

vehicle weight (i.e., both the truck and cargo weight) of more than 129,000 pounds (58,500

kilograms). Note: This specific terminology does not appear in the applicable Federal

regulations.

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