Document: NUREG-0800
Document ID: ff44162c-1686-4c5a-a9b2-3fa72707163c
Document Type: srp
Title: ESF ATMOSPHERE CLEANUP SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070468.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.1
CFR Part: 
CFR Title: 

Content:
F atmosphere cleanup system. Meeting this criterion provides assurance that offsite doses of radiation resulting from accident conditions will not exceed regulatory limits.51 6. Compliance with GDC 64 requires monitoring the reactor containment atmosphere, spaces containing components for recirculation of LOCA fluids, effluent discharge paths, and the plant environs to detect radioactivity that may be released from normal operations (including anticipated operational occurrences) and postulated accidents. GDC 64 applies to this section because the ESF atmosphere cleanup systems are used to control releases of radioactivity from postulated accidents. The review ensures that means are provided to monitor releases. Meeting this criterion provides assurance that offsite doses of radiation resulting from accident conditions will not exceed regulatory limits and that releases will be adequately documented.52 Relevant requirements of the Commission's regulations identified above are met by using the regulatory positions contained in Regulatory Guide 1.52 as it relates to the design testing and 53 maintenance of ESF atmosphere cleanup system air filtration and adsorption units. Specific criteria necessary to meet the relevant requirements of the Commission's regulations are as follows:54 The ESF atmosphere cleanup systems should be designed so that they can operate after a design basis accident (DBA) and can retain radioactive material after a DBA. The system should have provisions to prefilter air, remove moisture and meet the Regulatory Guide 1.52 requirements for charcoal adsorption. The systems should be redundant, be designed to Seismic Category I 6.5.1-7 DRAFT Rev. 3 - April 1996 requirements, be able to actuate automatically, and be limited to an air flow rate of approximately 30,000 cfm. Design of instrumentation for ESF atmosphere cleanup systems should conform to the guidelines of Regulatory Guide 1.52 and to the recommendations of ANSI N509. Minimum