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:
utes of exposure may contribute to a single exposure pathway. scaling factor—A factor used to estimate the unknown activity of a radionuclide based on its ratio to the activity of a readily measured radionuclide or other parameter (e.g., C-14 scaled to power generation). significant contamination—As used for 10 CFR 50.75(g) recordkeeping, a quantity and/or concentration of residual radioactivity that would require remediation during decommissioning in order to terminate the license by meeting the unrestricted use criteria stated in 10 CFR 20.1402 (see NUREG-1757). significant release point—Any location, from which radioactive material is released, that contributes greater than 1 percent of the activity discharged from all the release points for a particular type of effluent considered. Regulatory Guide 1.109 lists the three types of effluent as (1) liquid effluents, (2) noble gases discharged to the atmosphere in gaseous radioactive waste, and (3) all other radionuclides discharged to the atmosphere in gaseous radioactive waste. significant residual radioactivity—Synonymous with the term “significant contamination.” site boundary—Site boundary means that line beyond which the land or property is not owned, leased, or otherwise controlled by the licensee. site environs—Locations outside of the nuclear power plant systems, structures, or components as described in the final safety analysis report or the ODCM. source check—A source check is a qualitative assessment of the channel response when the channel sensor is exposed to a source of increased radioactivity. survey—Survey means an evaluation of the radiological conditions and potential hazards incident to the production, use, transfer, release, disposal, or presence of radioactive material or other sources of radiation. When appropriate, such an evaluation includes a physical survey of the location of Rev. 2 of RG 1.21, Page 48 radioactive material and measurements or calculations of levels of