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:
ing the guidance of SRP Chapter 7, SRP BTP 7-10, SRP Chapter 13, and RG 1.97 for safety-related systems and RG 1.143, and industry guidance for nonsafety-related systems. If the DBA analysis indicates that the actuation of an ESF system is required to mitigate the consequences of a DBA and a signal from a radiological effluent monitor is necessary to actuate the ESF system, then the monitor should be designed and qualified to the design and QA criteria applicable to the ESF system. Conversely, if an automatically functioning device or system is used to reduce radioactive 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 11.5-61 Revision 6 – January 2016 appropriate treatment systems. Acceptable guidance is presented in SRP 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