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:
f the contamination Rev. 2 of RG 1.21, Page 23 should be further evaluated by more extensive surveys (e.g., monitoring wells or other evaluations as appropriate). These survey activities may be direct (i.e., occurring at, or very near, the source of the leak) or indirect (i.e., occurring at some distance from the source of the leak) depending on the accessibility of the source of the spill or leak and the mobility of the radionuclides. For spills or leaks occurring below the soil surface in inaccessible locations, direct scoping and characterization may not be feasible. In these cases, indirect monitoring techniques (e.g., ground water monitoring wells in a down gradient direction) should be used to satisfy existing regulatory requirements. These survey activities should, at a minimum, satisfy (1) the requirements of 10 CFR 50.75(g) and (2) the effluent reporting requirements of 10 CFR 50.36a for ground water discharges to the unrestricted area. In general, leaks and spills of radioactive material should be described (reported) in the ARERR for the calendar year the spill or leak occurred. Additionally, ground water monitoring data should be reported in the ARERR for the calendar year in which the data were collected. Refer to Regulatory Positions 8.5.1, 8.5.2, and 8.5.9 of this document for guidance on the general format for reporting abnormal releases to on-site areas and abnormal discharges to unrestricted areas. Although licensees may conduct a ground water monitoring effort for different reasons, for purposes of this regulatory guide, the surveys, characterization activities, site conceptual models, and other components of any ground water monitoring effort should be sufficient to do the following: 1. appropriately report, for purposes of accountability, effluents discharged to unrestricted areas, 2. document information in a format consistent with Table A-6 and Regulatory Position 8.5, 3. provide advance indication of potential future discharges to