Document: NRC Regulatory Guide
Document ID: c9b91798-6746-44f2-b0e6-f36a9de10265
Document Type: regulatory_guide
Title: Radiological Environmental Monitoring for Nuclear Power Plants + HISTORY - HISTORY 02/2025 – Periodic Review of Revision 2 – Issues identified for future consideration 11/2014 – Periodic Review of Revision 2 – Issues identified for future consideration Prior to the 2009 revision, RG 4.1 was entitled, "Programs for Monitoring Radioactivity in the Environs of Nuclear Power Plants" (Rev. 2)
Source: NRC Regulatory Guide Division 4
Source URL: https://www.nrc.gov/docs/ML2504/ML25043A394.pdf
Revision Date: 2025-03
Chapter: 
Section ID: RG-4.1
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CFR Title: 

Content:
Regulatory Guide Periodic Review Regulatory Guide Number: 4.1, Revision 2 Title: Radiological Environmental Monitoring for Nuclear Power Plants Office/division/branch: NRR/DRA/ARCB Technical Lead: Steve Garry Recommended Staff Action: Reviewed with issues identified for future consideration 1. What are the known technical or regulatory issues with the current version of the Regulatory Guide (RG)? Regulatory Guide 4.1 Revision 2 was issued in June 2009 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML091310141) and provides guidance for establishing and conducting an environmental monitoring program at nuclear power plants. The guidance continues to be applicable for radiological environmental monitoring of nuclear power plants. The basis for the regulatory requirements should be added to the RG, as follows: Criterion 64—Monitoring radioactivity releases. Means shall be provided for monitoring the reactor containment atmosphere, spaces containing components for recirculation of loss-of-coolant accident fluids, effluent discharge paths, and the plant environs for radioactivity that may be released from normal operations, including anticipated operational occurrences, and from postulated accidents. 10 CFR 50, Appendix I - In addition, text should be added to describe the 10 CFR 50, Appendix I requirement incorporated through Technical Specifications to include a requirement for environmental monitoring as follows: Provide data on measurable levels of radiation and radioactive materials in the environment to evaluate the relationship between quantities of radioactive material released in effluents and resultant radiation doses to individuals from principal pathways of exposure; and to identify changes in the use of unrestricted areas (e.g., for agricultural purposes) to permit modifications in monitoring programs for evaluating doses to individuals from principal pathways of exposure. An issue has been raised about monitoring the