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:
Section 11.5 and ANS N42.18-2004. The review addresses the types and placement of radiation detectors in plant systems, operational ranges and qualification of detectors in supporting the functions of radiation monitoring systems, functional interdependence and logic in alarming and terminating or diverting process or effluent streams. The review addresses the use and derivation of alarm setpoints in notifying control room operators and initiating automatic control functions in complying with doses for workers, members of the public, and effluent concentration limits under 10 CFR Part 20, and design objectives of Appendix I to 10 CFR Part 50. The review considers design features used to prevent the radioactive contamination of otherwise nonradioactive plant systems, and in avoiding unmonitored and uncontrolled releases of radioactive materials in the environment. This appendix neither establishes, nor changes in any manner, the design and QA criteria established elsewhere for ESF or ESF-related systems or monitors. The design guidance set forth in this appendix provides reasonable assurance that monitors used to provide initiation signals for actuation of systems to control the release of radioactive materials in effluents, but not required to mitigate the consequences of a DBA, are designed, constructed, installed, tested, and maintained on a level commensurate with their intended safety function. This appendix sets forth minimum requirements and is not intended to prohibit the implementation of equivalent design codes, standards, or QA measures other than those indicated herein. 2. Definitions Radiological Effluent Monitor: A device that removes a representative sample from the effluent stream, detects and quantitatively measures the radioactive materials present 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