Power Reactors (Division 1): Regulatory Guides 1.181 - 1.200

This page lists the number, title, publication date, and revisions for each regulatory guide in Division 1, "Power Reactors," with references to draft guides and related documents (where applicable).

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.

Guide Number	Title	Revision Number	Issue Date	Additional Information
1.181	Content of the Updated Final Safety Analysis Report in Accordance with 10 CFR 50.71(e) HISTORY 06/2019 – Periodic Review of Revision 0 – Revise 01/2015 – Periodic Review of Revision 0 – Issues identified for future consideration 01/2010 – Periodic Review of Revision 0 – No issues identified 03/1999 – DG-1083, Proposed Revision 0	0	09/1999	Reviewed in 2019 – Revise
1.182	Assessing and Managing Risk Before Maintenance Activities at Nuclear Power Plants (Withdrawn – See 77 FR 70846, 11/27/2012) HISTORY 05/2012 – Guidance from RG 1.182 has been incorporated in RG 1.160 12/1999 – DG-1082, Proposed Revision 0	W	11/2012
1.182		0	05/2000
1.183	Alternative Radiological Source Terms for Evaluating Design Basis Accidents at Nuclear Power Reactors HISTORY 04/2022 – DG-1389, Proposed Revision 1 10/2009 – DG-1199, Proposed Revision 1 12/1999 – DG-1081, Proposed Revision 0	DG	07/2026	DG-1425
		DG	7/2026	DG-1425 was issued
		1	10/2023
		0	07/2000	Reviewed in 2018 – Revise
1.184	Decommissioning of Nuclear Power Reactors HISTORY 02/2022 – DG-1347 Revision 1, Proposed Revision 2 06/2018 – DG-1347, Proposed Revision 2 02/2012 – DG-1271, Proposed Revision 1 04/2004 – Errata to update Reference 1 06/1997 – DG-1067, Proposed Revision 0	DG	02/2022	DG-1347, rev 1, proposed rev 2 of RG 1.184
		1	10/2013
		0	07/2000
1.185	Standard Format and Content for Post-Shutdown Decommissioning Activities Report HISTORY 02/2022 – DG-1349 Revision 1, Proposed Revision 2 06/2018 – DG-1349, Proposed Revision 2 12/2012 – DG-1272, Proposed Revision 1 04/2004 – Errata to update Reference 1 12/1997 – DG-1071, Proposed Revision 0	DG	02/2022	DG-1349, rev 1, proposed rev 2 of RG 1.185
		1	06/2013
		0	07/2000
1.186	Guidance and Examples for Identifying 10 CFR 50.2 Design Bases HISTORY 05/2026 – Periodic Review – Reviewed with no issues identified 05/2017 – Periodic Review – Reviewed with no issues identified 06/2011 – Periodic Review – Reviewed with no issues identified 12/2000 – RG 1.186 Revision 1 04/2000 – DG-1093, Proposed Revision 0	0	12/2000	Periodic Review in 2026 – Reviewed with no issues identified Periodic Review in 2017 – Reviewed with no issues identified
1.187	Guidance for Implementation of 10 CFR 50.59, Changes, Tests, and Experiments HISTORY 05/2019 – DG-1356, Proposed Revision 2 12/2016 – DG-1334, Proposed Revision 1 04/2000 – DG-1095, Proposed Revision 0	DG	07/2026	DG-1466
		3	06/2021
		2	06/2020
		1	05/2019
		0	11/2000	Periodic Review April 2011 No Action
1.188	Standard Format and Content for Applications To Renew Nuclear Power Plant Operating Licenses HISTORY 09/2019 – DG-1341, Proposed Revision 2 04/2015 – Periodic Review of Revision 1 – Issues identified for future consideration 04/2010 – Periodic Review of Revision 1 – No issues identified 01/2005 – DG-1140, Proposed Revision 1 08/2000 – DG-1104, Third Proposed Revision 0 08/1996 – DG-1047, Second Proposed Revision 0 12/1990 – DG-1009, First Proposed Revision 0	2	04/2020
		1	09/2005
		0	07/2001
1.189	Fire Protection for Nuclear Power Plants HISTORY 11/2020 – DG-1359 Proposed Revision 4 04/2009 – DG-1214, Proposed Revision 2 11/2006 – DG-1170, Proposed Revision 1 Prior to the issuance of DG-1170, RG 1.189 was entitled "Fire Protection for Operating Nuclear Power Plants" 06/2000 – DG-1097, Second Proposed Revision 0 10/1999 – DG-1094, First Proposed Revision 0	5	10/2023	Administrative Change
		4	05/2021
		3	02/2018	Periodic Review – November 2017 - Revise
		2	10/2009	Periodic Review – December 2014 -Considerations
		1	03/2007
		0	04/2001
1.190	Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence HISTORY 09/1999 – DG-1053, Second Proposed Revision 0 09/1993 – DG-1025, First Proposed Revision 0	0	03/2001	Periodic Review 06/2023 – Considerations Periodic Review 05/2013 – Considerations Periodic Review 04/2006 – No Action
1.191	Fire Protection Program for Nuclear Power Plants During Decommissioning and Permanent Shutdown HISTORY 08/2020 – DG-1370, Proposed Revision 1 11/2017 – Periodic Review of Revision 0 – Revise 10/2011 – Periodic Review of Revision 0 – No issues identified 07/1998 – DG-1069, Proposed Revision 0	1	01/2021
1.191		0	05/2001
1.192	Operation and Maintenance Code Case Acceptability, ASME OM Code HISTORY 01/2023 – DG-1407, Proposed Revision 5 01/2021 – DG-1368, Proposed Revision 4 08/2018 – DG-1343, Proposed Revision 3 03/2016 – DG-1297, Proposed Revision 2 06/2013 – DG-1232, Proposed Revision 1 12/2001 – DG-1089, Proposed Revision 0	DG	02/2026	Issued DG-1448: Federal Register Notice
		5	03/2024	07/2024: Final Rule Federal Register Notice
		4	12/2021	03/2022: Final Rule Federal Register Noticehttps://www.federalregister.gov/documents/2024/07/17/2024-15288/american-society-of-mechanical-engineers-code-cases-and-update-frequency
		3	10/2019	03/2020: Final Rule Federal Register Notice
		2	03/2017	01/2018: Final Rule Federal Register Notice
		1	10/2014
		0	06/2003
1.193	ASME Code Cases Not Approved for Use HISTORY 01/2023 – DG-1408, Proposed Revision 8 01/2021 – DG-1369, Proposed Revision 7 08/2018 – DG-1344, Proposed Revision 6 03/2016 – DG-1298, Proposed Revision 5 06/2013 – DG-1233, Proposed Revision 4 06/2009 – DG-1193, Proposed Revision 3 05/2006 – DG-1135, Proposed Revision 2 08/2004 – DG-1126, Proposed Revision 1 12/2001 – DG-1112, Proposed Revision 0	8	03/2024	07/2024: Final Rule Federal Register Notice
		7	12/2021	03/2022: Final Rule Federal Register Notice
		6	10/2019	03/2020: Final Rule Federal Register Notice
		5	08/2017	01/2018: Final Rule Federal Register Notice
		4	10/2014
		3	10/2010
		2	10/2007
		1	08/2005
		0	06/2003
1.194	Atmospheric Relative Concentrations for Control Room Radiological Habitability Assessments at Nuclear Power Plants HISTORY 09/2015 – Periodic Review of Revision 0 – Issues identified for future consideration 12/2001 – DG-1111, Proposed Revision 0	0	06/2003	Reviewed in 2015 – Issues identified with future consideration
1.195	Methods and Assumptions for Evaluating Radiological Consequences of Design Basis Accidents at Light-Water Nuclear Power Reactors HISTORY 06/2026 – Periodic Review – Reviewed with issues identified for future consideration 07/2016 – Periodic Review – Reviewed with no issues identified 08/2011 – Periodic Review – Reviewed with no issues identified 05/2003 – RG 1.195 Revision 0 01/2002 – DG-1113, Proposed Revision 0	0	05/2003	Periodic Review in 2026 – Reviewed with issues identified for future consideration Periodic Review in 2016 – Reviewed with no issues identified
1.196	Control Room Habitability at Light-Water Nuclear Power Reactors HISTORY 03/2002 – DG-1114, Proposed Revision 0	1	01/2007	Periodic Review – August 2023 - Considerations
1.196		0	05/2003	Periodic Review - August 2013 – Considerations
1.197	Demonstrating Control Room Envelope Integrity at Nuclear Power Reactors HISTORY 05/2015 – Periodic Review of Revision 0 – No issues identified 04/2010 – Periodic Review of Revision 0 – No issues identified 03/2002 – DG-1115, Proposed Revision 0	0	05/2003	Periodic Review – June 2025 - Reviewed with Issues Identified for Future Consideration Reviewed in 2015 – No issues identified
1.198	Procedures and Criteria for Assessing Seismic Soil Liquefaction at Nuclear Power Plant Sites HISTORY 09/2014 – Periodic Review of Revision 0 – Issues identified for future consideration 03/2001 – DG-1105, Proposed Revision 0	0	11/2003	Reviewed February 2025 - Revise
1.199	Anchoring Components and Structural Supports in Concrete HISTORY 04/2019 – DG-1284, Proposed Revision 1 04/2015 – Periodic Review of Revision 0 – Revise 07/2002 – DG-1099, Proposed Revision 0	1	04/2020
1.199		0	11/2003
1.200	Acceptability of Probabilistic Risk Assessment Results for Risk-Informed Activities HISTORY 06/2020 – DG-1362, Proposed Revision 3 10/2014 – Periodic Review of Revision 2 – Revise 06/2008 – DG-1200, Proposed Revision 2 Clarification to RG 1.200, Revision 1 09/2006 – DG-1161, Proposed Revision 1	3	12/2020
		2	03/2009	Public Meeting Slides July 2008
		1	01/2007
		0	02/2004

Page Last Reviewed/Updated Tuesday, August 11, 2026

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Power Reactors (Division 1): Regulatory Guides 1.181 - 1.200