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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Content:
2011, the approach to achieving representative effluent sampling presented in the revised standard represents a departure from the methodology recommended by the previous version of this standard. The standard notes that by shifting from prescriptive rules and focusing instead on quantitative performance, the standard provides a method which should result in much lower sample losses during sampling and, therefore, yield samples that are more representative of the sampled stream. The guidance cited above also provides information on the requirements of QA programs. In addition to RG 4.15, the review addresses the process used to develop, review, verify, validate, and audit digital computer software used in radiation monitoring and sampling equipment. This aspect addresses software developed by the applicant, purchased through a vendor, or included with the instrumentation. 11.5-24 Draft Revision 6 – August 2014 For processing systems equipped with automatic control features relying on radiation detectors. The design should provide the justification for the placement of valves and dampers to isolate or divert flows in process piping and effluent exhaust vents and stacks to ensure their timely closures upon the detection of elevated radioactivity levels. If part of the design, information should be included when controls are used to monitor deviations in-plant exhaust flow rates and terminate releases or isolate process flows when deviations exceed preset limits. Other considerations may include determining whether system logic demands that a valve or damper should 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 ANSI N42.18-2004. The review conducted in this SRP section, with supporting information from SRP Sections 11.2, 11.3, and 11.4, evaluates the methods and