Document: NUREG-0800
Document ID: e1c5261f-4ef6-4478-8cf0-015611057574
Document Type: srp
Title: and 9.3.2, “Process and Post-accident Sampling Systems.”  The review addresses
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1502/ML15029A039.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.5
CFR Part: 
CFR Title: 

Content:
eratures, pressures, humidity, and dynamic adsorption coefficients are used to calculate the effective holdup times meeting or exceeding the performance criteria of RG 1.112 and guidance of NUREG-0016 or NUREG-0017, as modified to reflect specific design features and DC/COL-ISG-05 in the use of GALE86. The above information may be drawn from standard DCs or topical reports, taking into account the expected processing flow rates and volumes, and the 11.3-26 Revision 4 – January 2016 physical, chemical, and radiological properties of gaseous process and effluent streams. E. Types and characteristics of filtration and adsorbent media to treat gaseous process and effluent streams, with removal efficiencies and decontamination factors meeting or exceeding the performance of NRC generic guidance NUREG-0016 or NUREG-0017 (as modified) and RG 1.112 and 1.140, standard DCs, or topical reports, taking into account the expected physical, chemical, and radiological properties of gaseous process and effluent streams. F. For processing systems equipped with automatic control features, the design should provide the justification for the placement of isolation valves and radiation detectors on process piping and effluent exhaust vents and stacks to ensure the timely closure of such dampers/valves upon the detection of elevated radioactivity levels, and, if part of the design, controls in monitoring deviations of in-plant exhaust flow rates and terminating releases or isolating 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 discussed in SRP Section 11.5 and ANS N42.18-2004. The average input flow rates and volumes are compared with the design flows to