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Airborne Contamination Monitors - doe-std-1128-98_ch10068
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Criticality Alarm Systems.


DOE-STD-1128-98
ANSI N13.1 (ANSI, 1969a) provides detailed guidance on sampling
methods. One criterion that relates to CAMs is that air sample lines
between air inlet and filter media are to be eliminated where possible;
where not possible, they are to be designed to meet the sampling criteria
contained in the standard (e.g., short lines, proper sampling rate, smooth
bends). The use of Tygon tubing as sample lines before the collection
filter should be minimized or eliminated. Air in-leakage from
surrounding areas can be a problem when using sampling lines. Testing
for air in-leakage shall be performed at least annually or when seals or
"O" rings are replaced.
Surface Contamination Monitors. Surface contamination monitors
include hand and/or shoe counters and instruments (or probes) with
sufficient flexibility to survey pieces of equipment, including exterior
clothing. ANSI N317 (ANSI, 1980a) states that these instruments shall
have an audible alarm, a frequency that is proportional to the count rate,
or a preselectable trip setting, and that upon reaching that level shall
activate an audible or visible alarm or both. These instruments should be
calibrated according to the requirements in ANSI N323 (ANSI, 1997b)
and be equipped with a traceable check source. Fixed instruments should
be powered by alternating current (AC) and provided with an emergency
power source.
Photon and Neutron Area Monitors. Photon and neutron area monitors
measure the intensity of photon and neutron radiation in areas where
significant quantities of plutonium are stored and/or handled. ANSI
N317 (ANSI, 1980a) states that these monitors shall have a preselectable
trip setting with audible annunciators, shall provide electronic signals for
remote alarms if they are used as alarming devices, and shall be equipped
with a visual meter or digital readout. All neutron and photon area
monitors should be AC-powered and all critical monitors should be
provided with an emergency power source. Many of the requirements
that apply to portable survey instruments, as stated in ANSI N317 may
also apply to this type of instrumentation. Calibrations should be
performed according to the requirements in ANSI N323 (ANSI, 1997b).
3.5.2.3
Performance Criteria for Emergency Instrumentation
Meeting the criteria for criticality accident alarm systems, fixed nuclear
accident dosimeters, and other emergency instrumentation is essential.
3-21


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