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Management of Commercially Generated Radioactive Waste - U.S. ...

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Head End <strong>of</strong> the Fuel Cycle: Mining, milling, enrichment, and fabrication <strong>of</strong> U0 2 fuel.<br />

8.6<br />

HEPA: High-efficiency particulate air (filter).<br />

High-Level Liquid <strong>Waste</strong> (HLLW): The aqueous waste resulting from operation <strong>of</strong> the first<br />

cycle solvent extraction system (or its equivalent) in a facility for reprocessing irradiated<br />

reactor fuels as well as concentrated wastes from subsequent cycles.<br />

High-Level <strong>Waste</strong> (HLW): DOE management directives define high-level waste to include highlevel<br />

liquid wastes, products from solidification <strong>of</strong> high-level liquid waste, and irradiated<br />

fuel elements if discarded without reprocessing. A proposed NRC regulation (10 CFR<br />

¼ 60.3) defines high-level waste to include irradiated fuel, high-level liquid waste, and<br />

products from its solidification. In the GEIS there are instances, however, where discarded<br />

spent fuel and high-level waste (as wastes from the reprocessing <strong>of</strong> spent fuel) are<br />

cited separately.<br />

Highly Enriched Uranium (HEU): Uranium containing 5% or more <strong>of</strong> added 235 U.<br />

HM: Heavy metal, generally uranium and plutonium.<br />

Hornblende: A common member <strong>of</strong> the amphibole group <strong>of</strong> minerals.<br />

Hot Cell: A facility which allows remote viewing and manipulation <strong>of</strong> radioactive<br />

substances.<br />

Hydraulic Gradient: The change in static head per unit <strong>of</strong> lateral distance in a given<br />

direction.<br />

Hydrologic: Pertaining to the study <strong>of</strong> the properties, distribution and circulation <strong>of</strong><br />

water on the surface <strong>of</strong> the land, in the soil and underlying rocks, and in the atmosphere.<br />

Hydrostatic Pressure: The pressure exerted by the water at any given point in a body <strong>of</strong><br />

water at rest.<br />

ICPP: Idaho Chemical Processing Plant.<br />

ICRP: International Commission on Radiological Protection.<br />

ILLW: Intermediate-level liquid waste.<br />

Immobilization: Treatment and/or emplacement <strong>of</strong> the wastes so as to impede their movement.<br />

Interim Storage: Storage operations for which a) monitoring and human control are provided<br />

and b) subsequent action involving treatment, transportation, or final disposition is<br />

expected.<br />

Interstices: In geology, small openings between solid particles in a rock or unconsolidated<br />

material; may be a void or pore and <strong>of</strong>ten contains ground water. Interstitial permeability<br />

is used to differentiate interconnected pore permeability from fracture<br />

permeability.<br />

Ion Exchange: Replacement <strong>of</strong> ions adsorbed on a solid, such as a clay particle, or exposed<br />

at the surface <strong>of</strong> a solid by ions from solution, usually in natural water. The phenomenon<br />

is known to occur when natural water moves through clays, zeolitic rocks, and other materials<br />

<strong>of</strong> the earth's crust.<br />

ISFS: Independent spent fuel storage.<br />

ISFSF: Independent spent fuel storage facility.<br />

Isolation: Segregating wastes from the accessible environment (biosphere) to the extent<br />

required to meet applicable radiological performance objectives.<br />

Joint: A fracture or parting in a rock, along which little or no displacement <strong>of</strong> rock material<br />

has occurred.

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