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:
and ground water, as applicable. The report should also describe the impact (if any) on other affected exposure pathways (e.g., inhalation). 2. The following are the thresholds for reporting abnormal releases and abnormal discharges in the supplemental information section: a. abnormal releases or abnormal discharges that are voluntarily reported to local authorities under NEI 07-07, “Industry Ground Water Protection Initiative— Final Guidance Document,” (Ref.50); b. abnormal releases or abnormal discharges estimated to exceed 100 gallons (380 liters) of radioactive liquid where the presence of licensed radioactive material is positively identified (in either the on-site environs or in the source of the leak or spill) as greater than the minimum detectable activity (the minimum detectable activity is a post-analysis calculation of sensitivity level based on the actual sample measurement) for the laboratory instrumentation; c. abnormal releases to on-site areas that result in detectable residual radioactivity after remediation; d. abnormal releases that result in a high effluent radiation alarm without an anticipated system trip occurring; and Rev. 2 of RG 1.21, Page 39 e. abnormal discharges to an unrestricted area. 3. Information on abnormal releases or abnormal discharges should include the following, as applicable: a. date and duration, b. location, c. volume, d. estimated activity of each radionuclide, e. effluent monitoring results (if any), f. on-site monitoring results (if any), g. depth to the local water table, h. classification(s) of subsurface aquifer(s) (e.g., drinking water, unfit for drinking water, not used for drinking water), i. size and extent of any ground water plume, j. expected movement/mobility of any ground water plume, k. land use characteristics (e.g., water used for irrigation), l. remedial actions considered or taken and results obtained, m. calculated member of the public dose attributable to the release n. calculated member of the