Facility Posting and Labeling - doe-std-1128-98

DOE-STD-1128-98

3.2.2.4

Facility Posting and Labeling

Areas in plutonium facilities shall be posted in accordance with the

requirements in 10 CFR 835 (DOE, 1998a). Implementation Guide G

441.1-10, Implementation Guide. Posting and Labeling for Radiological

Control (DOE, 1999d) provides guidance to ensure compliance. The

technical criteria and dose rate and/or levels for defining radiation, high

radiation, very high radiation, contamination, high contamination, and

airborne radioactivity areas are established in 10 CFR 835. The health

physics staff should identify:

-- Areas to be barricaded and marked to prevent personnel from

inadvertently entering them.

-- Areas to be physically controlled per 10 CFR 835, Subpart F.

Entrance to radiological areas shall be controlled (10 CFR 835.501(a and

b)) commensurate with the existing and potential radiological hazard

within the area.

The health physics staff should post current radiation surveys of radiation

areas at the health physics access control point for use in prejob

planning. Airborne Radioactivity Areas shall be posted with the words,

"Caution, Airborne Radioactivity Area" when the airborne radioactivity

levels in the occupied area exceed, or are likely to exceed, the DAC

value listed in Appendix A or Appendix C of 10 CFR 835 or where an

individual could receive 12 DAC hours in a week (10 CFR 835.603(d)).

These areas are posted to alert personnel of possible respiratory

protection requirements.

3.2.2.5

Unposted Areas

Certain areas of facilities that handle radioactive materials should be

maintained free of detectable radioactive contamination. These areas

should also be maintained at ambient radiation levels equivalent to the

environmental background of the facility. Parts of the facility that should

meet these requirements include lunchrooms, offices, restrooms, janitor

rooms, corridors outside operational areas, foyers, and outside areas

surrounding the facility, including the building roofs.

To assure these areas meet the requirements of radiological cleanliness,

they should be surveyed with count-rate instruments sensitive to the

radioactive isotopes of interest. In a plutonium facility, the instruments

should meet the requirements listed in ANSI Standard N317-1991,

Performance Criteria for Instrumentation

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