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Radiological Surveys and Data Trending cont'd - doe-std-1128-98_ch10056
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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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
3-9


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