Document: NUREG-0800
Document ID: c400c35a-87e7-4392-950a-36828ff5879f
Document Type: srp
Title: ESF ATMOSPHERE CLEANUP SYSTEMS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340760.pdf
Revision Date: 2023-06
Chapter: 6
Section ID: 6.5.1
CFR Part: 
CFR Title: 

Content:
be below Part 100, an atmosphere cleanup system that meets the acceptance criteria listed in Item 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 ETSB review the plant design is reviewed to determine where ESF atmosphere cleanup systems are needed. This effort is coordinated with AEB. 2. The ETSB review is carried out by making a detailed comparison of atmosphere cleanup system designs with the acceptance criteria of Section II, above. 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 use in accident analyses to calculate offsite doses to the whole body and thyroid. 6.5.1-4 Rev. 2 - July 1981 TABLE 6.5.1-1 Minimum instrumentation, readout, recording and alarm provisions for ESF atmosphere cleanup systems References: ANSI N509 and Regulatory Guide 1.52 Continuously manned control panel (main control room or auxiliary control panel if manning is a tech spec Sensing location Local readout/alarm requirement) Unit inlet or outlet Flow rate (indication) Flow rate (recorded indi- cation, high alarm