Document: NRC Regulatory Guide
Document ID: a5cfec96-8785-464b-ada8-dc4424b90606
Document Type: regulatory_guide
Title: Quality Assurance for Radiological Monitoring Programs
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML0630/ML063060429.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.15
CFR Part: 
CFR Title: 

Content:
monitors. The monitor-response constant should be adjusted to maintain this correlation between effluent radionuclide concentration and monitor response. 7.2 Flow Monitoring Instrumentation Continuous sampling of liquids and gases involves the measurement of sample flow rates and/or sample volumes. The accuracy and associated uncertainty of the devices used for this purpose should be determined on a regularly scheduled basis, and adjustments should be made as needed to bring the performance of the devices within specified limits. The results of these calibrations should be recorded. The frequency of these calibrations should be specified and should be based on the necessary accuracy, purpose, degree of usage, stability characteristics, and other conditions affecting the measurement. Any flow-rate measuring devices associated with the system should be calibrated to determine actual flow rates at the conditions of temperature and pressure under which the system will operate. These flow rate devices should be recalibrated annually, but the frequency may be extended to that established for the radiation detector system, provided sufficient operating experience exists and an accelerated measurement check frequency gives sufficient data to ensure reliable performance. Flow measuring devices should be checked periodically on an established frequency, considering the variability of the instrument, and recalibrated when established control limits are exceeded. HPS/ANSI N13.1-1999 provides additional guidance on QA and QC measures for the use, maintenance, and calibration of airborne sampling instrumentation. ANSI N42.18-2004 provides additional guidance on the calibration of liquid flow monitors. 6 Replicate samples may be prepared by removing separate ALIQUANTS from the same grab sample. DG-4010, Page 14 7.3 Grab Sampling of Effluent Process Streams Whenever practicable, effluent releases should be batch-controlled and released when the volume to be released has been mixed