Document: NRC Regulatory Guide
Document ID: 5ec01b96-5209-446f-95b3-7342d73ba086
Document Type: regulatory_guide
Title: Design, Inspection, and Testing Criteria for Air Filtration and Adsorption Units of Post-Accident Engineered-Safety-Feature Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants + HISTORY - HISTORY 12/2011 – DG-1274 , Proposed Revision 4 10/2000 – DG-1102 , Proposed Revision 3 (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1124/ML11244A045.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.52
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CFR Title: 

Content:
were derived from Technical Information Document (TID) 14844, “Calculation of Distance Factors for Power and Test Reactor Sites,” issued 1962 (Ref. 7). Since the publication of TID-14844 in 1962, significant advances have been made in understanding the timing, magnitude, and chemical form of fission product releases from severe nuclear power plant accidents. In February 1995, the NRC published NUREG-1465, “Accident Source Terms for Light-Water Nuclear Power Plants” (Ref. 8), which provides estimates of an alternative accident source term based on insights from severe accident research. The NRC promulgated 10 CFR 50.67 to provide a means for operating reactors to change their design-basis source terms. The NRC staff issued Regulatory Guide 1.183, “Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors” (Ref. 9), to provide guidance to licensees of operating power reactors on acceptable applications of alternative source terms (ASTs). Regulatory Guide 1.183 establishes an acceptable AST and identifies the significant attributes of other ASTs that the NRC staff may find acceptable. Regulatory Guide 1.183 also identifies acceptable radiological analysis assumptions for use in conjunction with the accepted AST. The NRC staff expects that future plant applications will use the alternative accident source term, as appropriate, in support of safety analyses performed in accordance with 10 CFR 50.34, “Contents of Applications; Technical Information,” 10 CFR 52.47, “Contents of Applications; Technical Information” [Standard Design Certifications], 10 CFR 52.79, “Contents of Applications; Technical Information in Final Safety Analysis Report” [Combined Licenses], 10 CFR 52.137, “Contents of Applications; Technical Information” [Standard Design Approvals], 10 CFR 52.157, “Contents of Applications; Technical Information in Final Safety Analysis Report” [Manufacturing Licenses], and 10 CFR 50.90,