Terms used in this subchapter are defined in §336.2 of
this title (relating to Definitions). Additional terms used in this
subchapter have the following definitions.
(1) Active maintenance--Any significant remedial activity
needed during the period of institutional control to maintain a reasonable
assurance that the performance objectives in §336.724 of this
title (relating to Protection of the General Population from Releases
of Radioactivity) and §336.725 of this title (relating to Protection
of Individuals from Inadvertent Intrusion) are met. Active maintenance
includes ongoing activities such as the pumping and treatment of water
from a disposal unit or one-time measures such as replacement of a
disposal unit cover. Active maintenance does not include custodial
activities such as repair of fencing, repair or replacement of monitoring
equipment, revegetation, minor additions to soil cover, minor repair
of disposal unit covers, and general disposal site upkeep such as
mowing grass.
(2) Buffer zone--A portion of the disposal site that
is controlled by the licensee and that lies under the disposal units
and between the disposal units and the boundary of the disposal site.
(3) Chelating agent--A chemical or complex which causes
an ion, usually a metal, to be joined in the same molecule by relatively
stable bonding, e.g., amine polycarboxylic acids (e.g., EDTA, DTPA),
hydroxycarboxylic acids, and polycarboxylic acids (e.g., citric acid,
carbolic acid, and gluconic acid).
(4) Commencement of major construction--Any clearing
of land, excavation, or other substantial action that would adversely
affect the environment of a land disposal facility. The term does
not mean disposal site exploration, necessary roads for disposal site
exploration, borings to determine foundation conditions, or other
preconstruction monitoring or testing to establish background information
related to the suitability of the disposal site or the protection
of environmental values.
(5) Commercial processing--The storage, extraction
of materials, transfer, volume reduction, compaction, incineration,
solidification, or other separation and preparation of radioactive
substances from other persons for reuse or disposal, including any
treatment or activity that renders the waste less hazardous, safer
for transport, or amenable to recovery, storage, or disposal.
(6) Commingling--Any process that combines radioactive
substances from two or more generators resulting from the commercial
processing of radioactive substances.
(7) Containerized Class A waste--Class A low-level
radioactive waste which presents a hazard because of high radiation
levels. High radiation levels are radiation levels from an unshielded
container that could result in an individual receiving a dose equivalent
in excess of 0.1 rem (1 millisievert) in one hour at 30 centimeters
from any surface of the container that the radiation penetrates.
(8) Custodial agency--A government agency designated
to act on behalf of the government owner of the disposal site.
(9) Disposal site--That portion of a land disposal
facility which is used for disposal of waste. It consists of disposal
units and a buffer zone.
(10) Disposal unit--A discrete portion of the disposal
site into which waste is placed for disposal. For near-surface disposal,
the disposal unit is usually a trench.
(11) Engineered barrier--A man-made structure or device
that is intended to improve the land disposal facility's ability to
meet the performance objectives in this subchapter.
(12) Explosive material--Any chemical compound, mixture,
or device which produces a substantial instantaneous release of gas
and heat spontaneously or by contact with sparks or flame.
(13) Government agency--Any executive department, commission,
independent establishment, or corporation, wholly or partly owned
by the United States of America or the State of Texas and which is
an instrumentality of the United States or the State of Texas; or
any board, bureau, division, service, office, officer, authority,
administration, or other establishment in the executive branch of
the government.
(14) Hydrogeologic unit--Any soil or rock unit or zone
which by virtue of its porosity or permeability, or lack thereof,
has a distinct influence on the storage or movement of groundwater.
(15) Inadvertent intruder--A person who might occupy
the disposal site after closure and engage in normal activities, such
as agriculture, dwelling construction, or other pursuits in which
the person might be unknowingly exposed to radiation from the waste.
(16) Incidental--Unavoidable or otherwise unintentional
actions that, with respect to commingling of waste, prevents party
state compact waste from being kept separate from waste from other
sources without undue risk to occupational or public health and safety
or the environment.
(17) Intruder barrier--A sufficient depth of cover
over the waste that inhibits contact with waste and helps to ensure
that radiation exposures to an inadvertent intruder meet the performance
objectives set forth in this subchapter, or engineered structures
that provide equivalent protection to the inadvertent intruder.
(18) Monitoring--Observing and making measurements
to provide data to evaluate the performance and characteristics of
the disposal site.
(19) Party state compact waste--Low-level radioactive
waste generated in a party state of the Texas Low-Level Radioactive
Waste Disposal Compact.
(20) Pyrophoric material--
(A) Any liquid that ignites spontaneously in dry or
moist air at or below 130 degrees Fahrenheit (54.5 degrees Celsius);
or
(B) Any solid material, other than one classed as an
explosive, which under normal conditions is liable to cause fires
through friction, retained heat from manufacturing or processing,
or which can be ignited readily and when ignited burns so vigorously
and persistently as to create a serious transportation, handling,
or disposal hazard. Included are spontaneously combustible and water-reactive
materials.
(21) Reconnaissance-level information--Any information
or analysis that can be retrieved or generated without the performance
of new comprehensive site-specific investigations. Reconnaissance-level
information includes, but is not limited to, relevant published scientific
literature; drilling records required by the commission or other state
agencies, such as the Railroad Commission of Texas and the Texas Natural
Resources Information System; and reports of governmental agencies.
(22) Site--The contiguous land area where any land
disposal facility or activity is physically located or conducted including
adjacent land used in connection with the land disposal facility or
activity, and includes soils and groundwater contaminated by radioactive
material. Activity includes the receipt, storage, processing, or handling
of radioactive material for purposes of disposal at a land disposal
facility.
(23) Site closure and stabilization--Those actions
that are taken upon completion of operations that prepare the disposal
site for custodial care and that assure that the disposal site remain
stable and not need ongoing active maintenance.
(24) Stability--Structural stability.
(25) Surveillance--Observation of the disposal site
for purposes of visual detection of need for maintenance, custodial
care, evidence of intrusion, and compliance with other license and
regulatory requirements.
(26) Waste--See "low-level radioactive waste" as defined
in §336.2 of this title.
(27) Waste from other sources--Any low-level radioactive
waste that is not party state compact waste.
(28) Waste of international origin--Low-level radioactive
waste that originates outside of the United States or territory of
the United States, including waste subsequently stored or processed
in the United States.
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