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:
r the necessary instrumentation and facilities to perform gross beta-gamma and gross alpha measurements, isotopic or radionuclide-specific analyses, and other routine analyses using the guidance of RG 1.21, RG 1.33, and RG 4.15. C. Provisions should be made to perform routine instrument calibration, maintenance, and inspections using the guidance of RG 4.15 and RG 1.33. Instrumentation calibration procedures should consider whether instrumentation response is expected to change given that radionuclide distributions may vary with the operating status of the plant (i.e., normal operation, AOOs, accidents, and post- accident conditions). The plant’s RETS/SREC and ODCM should indicate the frequency of calibration and maintenance cycles. Provisions should also be made to replace or decontaminate instrumentation or sampling equipment without opening the process system or losing the capability of isolating the effluent stream. D. Isolation valves and dampers with automatic control features should fail in the closed or safe position to prevent unmonitored and uncontrolled releases of 11.5-19 Revision 6 – January 2016 radioactivity. The plant’s RETS/SREC and ODCM should establish setpoints for the actuation of automatic control features in initiating the timely actuation of valves and dampers in isolating or diverting flows. The basis for establishing instrumentation alarm or system activation setpoints should be provided, taking into consideration the following: i. For liquid effluents, in-plant effluent dilution factors and dilution factors beyond the point of discharge to the site boundary and nearest offsite dose receptors. ii. For gaseous and particulate effluents from plant stacks and building vents, atmospheric dispersion (X/Q) and deposition (D/Q) factors to the site boundary and offsite dose receptors. iii. The review of the design of the plant stack and building ventilation exhaust vents, as they relate to their site locations, release heights, exhaust flow