Document: NUREG-0800
Document ID: faf774de-7226-41f8-ba11-7cf612907af6
Document Type: srp
Title: GASEOUS WASTE MANAGEMENT SYSTEM
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1306/ML13065A119.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.3
CFR Part: 
CFR Title: 

Content:
rational flexibility designed into the GRS (e.g., cross-connections between systems, redundant or reserve processing equipment, and reserve storage capacity, including the use of mobile processing and treatment systems). D. In the evaluation of charcoal delay systems for radioactive gas decay, the number of beds or tanks, bed or tank volumes and dimensions, mass of charcoal in each bed or tank, charcoal mesh size and bulk density, processing flow rates, temperatures, 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 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