Document: NUREG-0800
Document ID: 2f527583-f167-477c-9a93-bc8f7db676b6
Document Type: srp
Title: for the LWMS and GWMS, respectively.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1307/ML13072A545.pdf
Revision Date: 2023-06
Chapter: 11
Section ID: 11.3
CFR Part: 
CFR Title: 

Content:
tors on process piping to ensure the timely closure of such valves upon the detection of elevated radioactivity levels. 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 ANS N42.18-2004. 11.4-16 Draft Revision 4 –August 2014 17. The design of exhaust ventilation systems used to collect and vent radioactive gases and vapors from tanks, vessels, and processing equipment should use the guidance in SRP Sections 9.3, 9.4, 10.4, 11.3, and 11.5 using the guidance in RGs 1.140 and 1.143 and industry standards. The guidance addresses the design, testing, maintenance, and monitoring of HEPA filters and charcoal absorbers installed in ventilation exhaust systems. If removal efficiencies assigned to radioiodine filtration systems differ from those given in RG 1.140, they should be supported by test data or industry standards under operating or simulated operating conditions. Operating data should address design temperatures and pressure, humidity levels, expected iodine concentrations, flow rates, and types of charcoal (grade, mesh size and bulk density). The test data should also support the effects of aging and poisoning by airborne contaminants. 18. The seismic design of structures housing SWMS components, the safety and quality group classifications of liquid radwaste treatment equipment, and provisions to prevent and collect spills from indoor and outdoor storage tanks should conform to the guidance of RG 1.143 for liquids, wet wastes, and solid wastes produced during normal operation and AOOs. The RG 1.143 describes design guidance acceptable to the NRC staff related to seismic, safety, and quality group classifications and QA provisions for the systems and skid-