Document: NRC Regulatory Guide
Document ID: 96baa826-d3bb-478b-8f38-e74500f6d433
Document Type: regulatory_guide
Title: 06/2009 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0911/ML091170109.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.21
CFR Part: 
CFR Title: 

Content:
ate the assumptions. Hypothetical exposure pathways and locations are sometimes used for bounding dose assessments (or hazard evaluations done in accordance with 10 CFR 20.1501). See the definition of “hypothetical exposure pathway” in the glossary. Rev. 2 of RG 1.21, Page 27 5.2 Individual Members of the Public Individual members of the public reside in the unrestricted area but at times may enter the controlled area of a commercial nuclear power plant. Each licensee is responsible for classifying individuals (by location) as either members of the public or as occupational workers. (See definition of “members of the public” in 10 CFR Part 20.) The annual dose limits for members of the public in the unrestricted area are 25 millirem (mrem) whole body and 75 mrem to the thyroid and 25 mrem to any other organ in accordance with the EPA regulations in 40 CFR Part 190; the limits are 100 mrem in accordance with 10 CFR 20.1301. In effect, annual dose limits to members of the public while in the unrestricted area are the EPA limits of 25 mrem whole body and 75 mrem to the thyroid and 25 mrem to any other organ; whereas the annual dose limit for a member of the public in the licensee’s controlled area is the NRC’s total effective dose equivalent limit of 100 mrem. If bounding assessments are not used, licensees should perform evaluations to determine the dose to a real, maximum exposed member of the public, regardless of whether the individual is in an unrestricted area or a controlled area. If no member of the public is allowed in the controlled area, the evaluation need consider only members of the public in the unrestricted area. A member of the public is typically a real individual in a designated location where there is a real exposure pathway (e.g., a real garden, real cow, real goat, or actual drinking water supply) and is typically not a fictitious fencepost resident or an exposure pathway that includes a virtual goat or cow. Licensees are encouraged