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Environmental and Siting (Division 4): Regulatory Guides 4.21 - 4.30

This page lists the number, title, publication date, and revisions for each regulatory guide in Division 4, "Environmental and Siting," with references to draft guides and related documents (where applicable).

See also Draft Regulatory Guides for Public Comment.

See NRC Regulatory Guides for more general information.

Regulatory Guides are reviewed about every 10 years, although a guide may be reviewed more frequently if the staff believes an emerging issue affects the guide. The NRC began these reviews in 2010, and began posting the results of its reviews on this site in 2013. The review dates are hyperlinked to the review memorandum, which provide useful information about the status and any known issues with the associated regulatory guide.

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Guide
Number		TitleRevision
Number		Issue
Date		Additional
Information
4.21

Minimization of Contamination and Radioactive Waste Generation:  Life-Cycle Planning

HISTORY
  • 07/2013 – Periodic Review of Revision 0 – No issues identified
006/2008Periodic Review – June 2023 - Considerations

Reviewed in 2013 – No issues identified
4.22

Decommissioning Planning During Operations

HISTORY
  • 12/2011 – DG-4014, Proposed New Guide
012/2012Periodic Review - August 2024 - Considerations
4.24

Aquatic Environmental Studies for Nuclear Power Stations

HISTORY
  • 12/2014 – DG-4023-Proposed New Guide
012/2016 
4.25

Assessment of Abnormal Radionuclide Discharges in Ground Water to the Unrestricted Area at Nuclear Power Plant Sites

HISTORY
003/2017 
4.26

Volcanic Hazards Assessment for Proposed Nuclear Power Reactor Sites

HISTORY
108/2023Rev 1 is an administrative
change
006/2021 
4.27

Use of Plant Parameter Envelope In Early Site Permit Applications for Nuclear Power Plants

HISTORY
  • 06/2021 – DG-4029, Proposed Revision 0
007/2023 
4.28

Use of ARCON Methodology For Calculation Of Accident-Related Offsite Atmospheric Dispersion Factors

HISTORY
  • 08/2021 – DG-4030, Proposed Revision 0 (re-assigned to Division 1 under RG 1.249 Revision 0)
Cxl re-assigned to Division 1 under RG 1.249 Revision 0
4.29

Graded Approach to Site Characterization

HISTORY
  • DG-4036, Proposed Revision 0, still in draft, non-public
DG07/2026DG-4036

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Page Last Reviewed/Updated Tuesday, August 11, 2026

Page Last Reviewed/Updated Tuesday, August 11, 2026