Document: NUREG-0800
Document ID: 3c241845-034f-4f89-b12a-f51967895c13
Document Type: srp
Title: PROCESS AND EFFLUENT RADIOLOGICAL MONITORING INSTRUMENTATION
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1307/ML13071A494.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
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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 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