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 the calculated dose (sum of the long-term doses from the LOCA and the purge dose at the low population zone outer boundary) is less than the guidelines of 10 CFR Part 100.11, no filtration system is required. 71 (2) If a radioiodine decontamination factor of 10 or less is needed for the calculated dose to be below Part § 100.11, an atmosphere cleanup 72 system that meets the acceptance criteria listed in Item 5 of SRP Section 11.3the design, testing, and maintenance guidelines for HEPA filters and charcoal adsorbers as specified in Regulatory Guide 1.140 are acceptable. If decontamination factors for iodine differ from those specified in Regulatory Guide 1.140 for design purposes, this fact should be supported by test data under operating or simulated conditions (including temperature, pressure, humidity, expected iodine concentrations, and flow rate). The effects of aging and poisoning by airborne contaminants should also be supported by test data.73 (3) If a radioiodine decontamination factor of greater than 10 is needed for the calculated dose to be below Part § 100.11, the ESF atmosphere 74 cleanup system meeting all of the above acceptance criteria, with the exception of Items 2b and 2c of Part C of Regulatory Guide 1.52, is acceptable. 4. If the applicant proposes to use the standby gas treatment system (SGTS) more than 90 hours per year during normal operation, the reviewer will verify that this level of use does not impair the capability of the SGTS to perform its intended function in the event of a LOCA.75 5. The applicant has provided for monitoring all radioactive releases from the ESF atmosphere cleanup systems.76 For standard design certification reviews under 10 CFR Part 52, the procedures above should be followed, as modified by the procedures in SRP Section 14.3 (proposed), to verify that the design set forth in the standard safety analysis report, including inspections, tests, analysis, and acceptance criteria (ITAAC), site interface