Deactivation

DOE-HDBK-1188-2006

123.

DEACTIVATION. Placing a facility in a stable and known condition including the removal of

hazardous and radioactive materials to ensure adequate protection of the worker, public health

and safety, and the environment, thereby limiting the long-term cost of surveillance and

maintenance. Actions include the removal of fuel, draining and/or deenergizing nonessential

systems, removal of stored radioactive and hazardous materials, and related actions.

Deactivation does not include all decontamination necessary for the dismantlement and

demolition phase of decommissioning, e.g., removal of contamination remaining in the fixed

structures and equipment after deactivation. [DOE O 430.1B]

124.

DECLARED PREGNANT WORKER. A woman who has voluntarily declared to her

employer, in writing, her pregnancy for the purpose of being subject to the occupational

exposure limits to the embryo/fetus as provided in 835.206. This declaration may be revoked,

in writing, at any time by the declared pregnant worker. [10 CFR 835.2]

125.

DECOMMISSIONING. Takes place after deactivation and includes surveillance and

maintenance, decontamination, and/or dismantlement. These actions are taken at the end of the

life of a facility to retire it from service with adequate regard for the health and safety of workers

and the public and protection of the environment. The ultimate goal of decommissioning is

unrestricted release or restricted use of the site. [DOE O 430.1A] [DOE G 433.1-1]

126.

DECOMMISSIONING. The process of closing and securing a nuclear facility or nuclear

materials storage facility to provide adequate protection from radiation exposure and to isolate

radioactive contamination from the human environment. It takes place after deactivation and

includes surveillance, maintenance, decontamination, and/or dismantlement. These actions are

taken at the end of the life of a facility to retire it from service with adequate regard for the

health and safety of workers and the public and protection of the environment. The ultimate

goal of decommissioning is unrestricted release or restricted use of the site. [DOE O 430.1B]

127.

DECONTAMINATION. The removal or reduction of residual radioactive and hazardous

materials by mechanical, chemical or other techniques to achieve a stated objective or end

condition. [DOE O 430.1B] [DOE G 433.1-1]

128.

DEEP DOSE EQUIVALENT. The dose equivalent derived from external radiation at a depth

of 1 cm in tissue. (See Committed Dose Equivalent, Committed Effective Dose Equivalent,

Cumulative Total Effective Dose Equivalent, Dose Equivalent, Effective Dose Equivalent, Lens

of the Eye Dose Equivalent, and Total Effective Dose Equivalent) [10 CFR 835.2]

129.

DEFECTIVE ITEM, MATERIAL, OR SERVICE. Includes any item, material, or service that

does not meet the commercial standard or procurement requirements as defined in catalogues,