Document: NUREG-0800
Document ID: 66e7af3b-21c0-444f-8737-0830bb176eba
Document Type: srp
Title: PROCESS AND EFFLUENT RADIOLOGICAL MONITORING INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1502/ML15029A182.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
CFR Part: 
CFR Title: 

Content:
nt in the sample, discharges the sampled medium back to the effluent stream, and transmits the measurement data to a central point. Some monitoring systems instead rely on the placement of a radiation detector near or within the effluent streams in achieving the same function without diverting any portion of the effluent stream. Monitoring System: A system consisting of one or more remote monitors; a centrally located cabinet or console where data from the monitors are received, recorded, converted to meaningful radiological units, and displayed; and the necessary interconnecting cables, power supplies, pumps, motors, alarms, recorders, display panels, and other auxiliary components. Automatic Control Feature: A design feature that automatically initiates a control or protective action when exceeding a defined instrumentation alarm set-point. The set point may represent radioactivity concentration levels and release rates, or signals other than radioactivity (e.g., fluid level, valve position, and system pressure, flow rate, and temperature). The initiation of control or protective actions may rely only the presence of radioactivity or be linked to the status other plant system parameters as functional interdependence and logic in alarming and terminating or diverting process or effluent streams. Other considerations may include determining whether system logic demands that a valve or damper fail in the closed position in protecting the system from further contamination, terminating releases to the environment, or diverting process streams or effluents to appropriate treatment systems. These provisions also apply to liquid and gaseous process radiation monitoring equipment not covered by the ODCM. 11.5-62 Revision 6 – January 2016 3. Design Guidance Design and QA criteria for radiological effluent monitors should be consistent with the design and QA criteria applicable to the systems actuated by a signal from the monitors. Monitors providing signals for the