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:
on of sampling and measurement. Expanded uncertainty should be reported with measurement results. The objective should be to evaluate only the important contributors and obtain a reasonable measure of the uncertainty associated with reported results. Detailed statistical and experimental evaluations are not required. The overall objective should be to obtain an overall estimate of measurement uncertainty. The formula for calculating the total or expanded uncertainty classically includes the square root of the sum of squares of each important contributor to the measurement uncertainty. Licensees may obtain additional information from NUREG-1576 and ANSI/HPS N13.1-1999 if there is a need to improve the estimate of uncertainty. 5. Dose Assessments for Individual Members of the Public The regulation in 10 CFR 20.1301 establishes dose limits for individual members of the public. The regulations referenced in Regulatory Positions 5.4 through 5.6 contain both dose limits and design objectives that the licensee demonstrates compliance with through calculations. Table 1 summarizes the fundamental parameters associated with the dose calculations. Regulatory Positions 5.7 and 5.8 present important concepts for these calculations. Because of differences between NRC and EPA regulations, only demonstrating compliance with radiological effluent technical specifications (based on Appendix I to Rev. 2 of RG 1.21, Page 26 10 CFR Part 50) does not necessarily ensure compliance with EPA’s 40 CFR Part 190, “Environmental Radiation Protection Standards for Nuclear Power Operations” (Ref. 35), particularly if there is a direct radiation component (e.g., from BWR shine, ISFSI, or radioactive materials storage). Table 1. Parameters Associated with Dose Calculations 10 CFR Part 50, Appendix I 10 CFR 20.1301(e) (EPA 40 CFR Part 190) Dose Whole Body, Max of Any Organ, Gamma Air, and Beta Air Whole Body, Thyroid, and Max of Any Organ Basis ICRP-2 EPA 40 CFR Part 190 Where Unrestricted