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
CFR Part: 
CFR Title: 

Content:
tive releases to ensure that offsite doses are maintained within the limits of the plant’s RETS/SREC (i.e., not for the purpose of mitigating the consequences of a DBA), then a monitor providing the actuation signal should be designed and qualified to criteria consistent with those of the actuated system, such as those that are important to safety and used to comply with the requirements of 10 CFR Part 20 in protecting plant workers and members of the public. For nonsafety-related systems, the review of interfaces of radiation monitoring instrumentation and controls, including provisions for automatic control features and interdependence with other plant system parameters (e.g., fluid level, valve position, and system pressure, flow rate, and temperature), is performed using the guidance presented in this SRP section. Other considerations may include determining whether a system’s functional 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. Acceptable guidance is presented in SRP Section 11.5 and 11.5-55 Draft Revision 6 – August 2014 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