Document: NRC Regulatory Guide
Document ID: 42f2dcf0-38ba-4f75-84d4-e60f4bbf9162
Document Type: regulatory_guide
Title: Assessment of Abnormal Radionuclide Discharges in Ground Water to the Unrestricted Area at Nuclear Power Plant Sites Appendix-Simple Ground Water Model for Estimating Offsite Tritium Activity Flux + HISTORY - HISTORY 12/2015 – DG-4025-Proposed New Guide
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML1523/ML15237A388.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-4.25
CFR Part: 
CFR Title: 

Content:
and the NRC Management Directive 8.4, “Management of Facility- Specific Backfitting and Information Collection” (Ref. 29), and NUREG-1409, “Backfitting Guidelines” (Ref. 30). DG-4025, Page 10 GLOSSARY abnormal release The unplanned or uncontrolled emission of an effluent (i.e., containing plant-related, licensed radioactive material (RG 1.21). accessible environment Outside the controlled area, notably the atmosphere; the land surface; surface water; oceans; and that portion of the lithosphere (including ground water). contaminant Any physical, chemical, biological, or radiological substance or matter that has an adverse effect on air, water, or soil quality. controlled discharge A radioactive discharge is considered to be “controlled” if (1) the discharge was conducted in accordance with methods, and without exceeding any of the limits, outlined in the offsite dose calculation manual, or (2) if one or more of the following three items are true: 1. The radioactive discharge had an associated, planned method of radioactivity monitoring that assured the discharge was properly accounted and was within the limits set by 10 CFR 20 and 10 CFR 50. 2. The radioactive discharge had an associated, planned method of termination (and associated termination criteria) that assured the discharge was properly accounted and was within the limits set by 10 CFR 20 and 10 CFR 50. 3. The radioactive discharge had an associated, planned method of adjusting, modulating, or altering the flow rate (or the rate of release of radioactive material) that assured the discharge was properly accounted and was within the limits set by 10 CFR 20 and 10 CFR 50 (RG 1.21). discharge point A location at which radioactive material enters the unrestricted area. This would be the point beyond the vertical plane of the unrestricted area (surface or subsurface) (RG 1.21). flux The volumetric or mass discharge per unit cross-sectional area of medium over time (solids plus pores); called the