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:
onitoring system should be calibrated every 12 months. This frequency may be extended to longer time periods coinciding with facility maintenance schedules, such as refueling for nuclear power plants, provided system reliability has been established and more frequent source checks and functional checks are performed for verifying proper system operation. 5 Frequencies should be appropriate to the instrument under consideration and may be dictated by license conditions. DG-4010, Page 13 Detectors should be response-checked periodically5 for continuous effluent release points (e.g., ventilation systems and secondary water systems) and before release for batch discharges (e.g., primary boundary or containment purges and liquid waste tank releases). Check sources should be of sufficient radiochemical purity so that the activity of the source may be corrected for decay to the date of measurement. These check sources need not be traceable to a national standards body (e.g., NIST). Whenever practicable, check sources should be an integral part of the monitoring system and should be remotely actuated. The functionality of isolation or alarm functions should be verified periodically, 4 preferably by use of a radiation source. Trends of process radiation monitor readings versus total radionuclide concentrations in the monitored release path should be performed routinely. These trends should be based on the results of analyses for specific radionuclides in samples taken from the release path that will yield a monitor response. Deviations in the trend may occur if concentrations or the mixture of radionuclides changed significantly (for example, during a fuel cycle in which significant fuel defects exist). The licensee should define the monitor-response parameter for all radiation 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