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Contamination Control - hdbk1132990058


DOE-HDBK-1132-99
1.3.3
Airborne Radiation Control . Established airborne concentration limits for
normal operating conditions should not be exceeded in occupied operating
areas. 10 CFR 835.1002(c) provides requirements for limiting concentrations.
ALARA principles should be used when designing confinement and ventilation
systems to limit airborne contamination levels. Respirators should not be
required during normal operations. Engineered controls and features should
minimize potential inhalation of radioactive and other hazardous materials under
all conditions. ASME N509, Nuclear Power Plant Air-Cleaning Units and
Components, and ASME N510 provide guidance for the design and testing of
nuclear facility HVAC systems.
Monitoring systems should be calibrated at least annually using appropriate
national standards. Radiation monitoring, alarm, and warning systems, which
are required to function during a loss of normal power, should be provided with
an emergency uninterruptible power supply (UPS) (internal or external on-line)
unless it can be demonstrated that these systems can tolerate a temporary loss
of function without losing needed data and that they are provided with standby
or emergency (switched) power. Determination of the power supply type and
quality should be based on the safety classification of the monitoring system or
device. The sampling motivation (vacuum) type and quality should also be
based on the safety classification. ANSI N13.2, Administrative Practices in
Radiation Monitoring (A Guide for Management), provides guidance for
administrative practices in radiation monitoring.
Air monitoring and warning systems should be installed in work areas where
hazardous materials are stored or handled or where hazardous airborne
particles or vapors may be present. Air sampling heads should be located to
provide a representative sample of potential airborne radioactive or hazardous
materials being breathed. ANSI N13.1, Guide to Sampling Airborne Radioactive
Materials in Nuclear Facilities, provides guidance for the design of air monitoring
systems.
I-41


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