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:
tem 5 of Acceptance Criteria in SRP Section 11.3 is acceptable. 3. If a radioiodine decontamination factor of greater than 10 is needed for the calculated dose to be below Part 100, the ESF atmosphere 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. III. REVIEW PROCEDURES The reviewer will select and emphasize material from this SRP section, as may be appropriate for a particular case. 1. In the ETSBSPLB reviews the plant design is reviewed to determine where ESF 55 56 atmosphere cleanup systems are needed. This effort is coordinated with AEBPERB.57 DRAFT Rev. 3 - April 1996 6.5.1-8 2. The ETSBSPLB review is carried out by making a detailed comparison of atmosphere 58 cleanup system designs with the acceptance criteria of Section II, above.59 3. SPLB verifies each ESF atmosphere cleanup system, as follows:60 a. The system is designed so that it can operate after a design basis accident (DBA) and can retain radioactive material after a DBA.61 The capability of a system to remove fission products from the atmosphere after a DBA is reviewed, based on a design loading of 2.5 mg of total iodine (radioactive plus stable) per gram of activated charcoal adsorbent. Designs consistent with General Design Criteria 19, 41, 42, 43, 61, and 64 and the guidelines of Regulatory Guide 1.52 will be assigned the system efficiencies for removal of elemental iodine and organic iodides given in Table 2 of Regulatory Guide 1.52 and a system efficiency of 99% for removal of particulates resulting from a DBA. The assigned efficiencies are for AEB PERB use in accident analyses to 62 calculate offsite doses to the whole body and thyroid. b. The system has provisions to prefilter air, remove moisture, and meet the requirements of Regulatory Guide 1.52 for charcoal adsorption.63 c. The system is redundant, is designed to Seismic Category I requirements, is able to actuate automatically, and is