Power Reactors (Division 1): Regulatory Guides 1.81 - 1.100

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
1.81	Shared Emergency and Shutdown Electric Systems for Multi-Unit Nuclear Power Plants + HISTORY - HISTORY 01/2019 – Periodic Review of Revision 1 – Reviewed with no issues identified (Hyperlink Periodic Review of Revision 1 to ) 02/2014 – Periodic Review of Revision 1 – Reviewed with no issues identified	1	01/1975	Reviewed in 2019 – No issues identified
1.81		0	06/1974
1.82	Water Sources for Long-Term Recirculation Cooling Following a Loss-of-Coolant Accident + HISTORY - HISTORY 01/2022 – DG-1385, Proposed Revision 5 01/2015 – Periodic Review of Revision 4 – Revise 04/2012 – Periodic Review of Revision 3 – Revise 07/2010 – DG-1234, Proposed Revision 4 02/2003 – DG-1107, Proposed Revision 3 07/1995 – DG-1038, Proposed Revision 2 05/1983 – Draft MS 203-4, Proposed Revision 1	5	08/2022
		4	03/2012	01/2015 – PR – Revise
		3	11/2003
		2	05/1996
		1	11/1985
		0	06/1974
1.83	Inservice Inspection of Pressurized Water Reactor Steam Generator Tubes (Withdrawn -- See 74 FR 58324, 11/12/2009)	W	11/2009
		1	07/1975
		0	07/1974
1.84	Design, Fabrication, and Materials Code Case Acceptability, ASME Section III + HISTORY - HISTORY 01/2023 – DG-1405, Proposed Revision 40 01/2021 – DG-1366, Proposed Revision 39 08/2018 – DG-1345, Proposed Revision 38 03/2016 – DG-1295, Proposed Revision 37 06/2013 – DG-1230, Proposed Revision 36 06/2009 – DG-1191, Proposed Revision 35 10/2006 – DG-1133, Proposed Revision 34 04/2004 – DG-1124, Proposed Revision 33 12/2001 – DG-1090, Proposed Revision 32(combined RG 1.84 and 1.85) 05/1997 – DG-1049, Proposed Revision 31	40	03/2024	07/2024: Final Rule Federal Register Notice
		39	12/2021	03/2022: Final Rule Federal Register Notice
		38	10/2019	03/2020: Final Rule Federal Register Notice
		37	03/2017	01/2018: Final Rule Federal Register Notice
		36	08/2014
		35	10/2010
		34	10/2007
		33	08/2005
		32	06/2003
		31	05/1999
		30	10/1994
		29	07/1993
		28	04/1992
		27	11/1990
		26	07/1989
		25	05/1998
		24	06/1986
		23	09/1985
		22	07/1984
		21	09/1983
		20	11/1982
		19	04/1982
		18	08/1981
		17	12/1980
		16	05/1980
		15	05/1979
		14	11/1978
		13	07/1978
		12	03/1978
		11	11/1977
		10	08/1977
		9	03/1977
		8	11/1976
		7	08/1976
		6	05/1976
		5	03/1976
		4	11/1975
		3	09/1975
		2	06/1975
		1	04/1975
		0	06/1974
1.85	Materials code case Acceptability - - ASME Section III, Division 1 (Withdrawn See -- 69 FR 34202 06/18/2004) + HISTORY - HISTORY 05/1997 – DG-1049, proposed revision 31 06/2003 – Guidance from Revision 31 of RG 1.85 was incorporated into Revision 32 of RG 1.84	W	06/2004
		31	05/1999
		30	10/1994
		27	11/1990
		26	07/1989
		23	09/1985
		22	07/1984
		21	09/1983
		17	12/1980
		16	05/1980
		15	05/1979
		14	11/1978
		13	07/1978
		12	03/1978
		11	11/1977
		10	08/1977
		9	03/1977
		8	11/1976
		7	08/1976
		6	05/1976
		5	02/1976
		4	11/1975
		3	09/1975
		2	06/1975
		1	04/1975
		0	06/1974
1.86	Termination of Operating Licenses for Nuclear Reactors (Withdrawn -- See 81 FR 53507, 08/12/2016) + HISTORY - HISTORY 12/2011 – Periodic Review of Revision 0 – Withdraw	W	08/2016
1.86		0	06/1974
1.87	Acceptability of ASME Code Section III, Division 5, 'High Temperature Reactors' + HISTORY - HISTORY 02/2022 – DG-1380 Supplemental FRN 08/2021 – DG-1380 – Proposed Revision 2 Supplement to ASME Section III Code Cases 1592, 1593, 1594, 1595, and 1596 (in 1975, RG 1.87 was issued as Revision 1)
		3	08/2025
		2	01/2023
		1	06/1975	Periodic Review - February 2021 - Revise Periodic Review – August 2019 – Withdraw Periodic Review – August 2016 – Considerations Periodic Review – November 2010 – No Action
1.88	Collection, Storage, and Maintenance of Nuclear Power Plant Quality Assurance Records (Withdrawn -- See 56 FR 36175, 07/31/1991)	W	07/1991
1.88		2	10/1976
1.89	Environmental Qualification of Certain Electric Equipment Important to Safety for Nuclear Power Plants + HISTORY - HISTORY 12/2020 – DG-1361, Proposed Revision 2 02/1982 – Draft EE 042-2, Proposed Revision 1	2	04/2023
		1	06/1984	Reviewed in 2018 – Revise Periodic Review May 2014 - Revise
		0	11/1974
1.90	Inservice Inspection of Prestressed Concrete Containment Structures with Grouted Tendons + HISTORY - HISTORY 05/2018 – Periodic Review of Revision 2 – Reviewed with issues identified for future consideration 04/2011 – DG-1197, Proposed Revision 2	2	11/2012	Reviewed in 2018 – Issues Identified for future consideration
		1	08/1977
		0	11/1974
1.91	Evaluations of Explosions Postulated To Occur on Transportation Routes Near Nuclear Power Plants + HISTORY - HISTORY 07/2021 – DG-1388 – Proposed Revision 3 07/2011 – DG-1270, Proposed Revision 2	3	11/2021
		2	04/2013	Periodic Review – June 2020 - Revise
		1	02/1978
		0	01/1975
1.92	Combining Modal Responses and Spatial Components in Seismic Response Analysis + HISTORY - HISTORY 05/2018 – Periodic Review of Revision 3 – Reviewed with issues identified for future consideration 02/2005 – DG-1127, Second Proposed Revision 2 08/2001 – DG-1108, First Proposed Revision 2	3	09/2012	Reviewed in 2018 – Issues identified for future consideration
		2	07/2006
		1	02/1976
		0	12/1974
1.93	Availability of Electric Power Sources + HISTORY - HISTORY 04/2017 – Periodic Review of Revision 1 – Reviewed with no issues identified 09/2010 – DG-1244, Proposed Revision 1 to RG 1.93 05/2008 – DG-1195, Second Proposed Revision 1 10/2003 – DG-1153, First Proposed Revision 1	1	03/2012	Reviewed in 2017 – No issues identified
1.93		0	12/1974
1.94	Quality Assurance Requirements for Installation, Inspection, and Testing of Structural Concrete and Structural Steel During the Construction Phase of Nuclear Power Plants (Withdrawn -- See 75 FR 54921, 09/09/2010) + HISTORY - HISTORY 09/1979 – Draft RS 908-5, Proposed Revision 2	W	09/2010
		1	04/1976
		0	04/1975
1.95	Protection of Nuclear Power Plant Control Room Operators Against an Accidental Chlorine Release (Withdrawn -- See 67 FR 939 01/08/2002) + HISTORY - HISTORY 01/2002 – Guidance from RG 1.95 has been updated and incorporated into Revision 1 of RG 1.78	W	01/2002
1.95		1	01/1977
1.96	Design of Main Steam Isolation Valve Leakage Control Systems for Boiling Water Reactor Nuclear Power Plants	1	06/1976	Periodic Review – August 2023 -Withdraw Periodic Review - October 2013 – Considerations
1.96		0	05/1975
1.97	Criteria for Accident Monitoring Instrumentation for Nuclear Power Plants + HISTORY - HISTORY 12/2017 – DG-1335, Proposed Revision 5 06/2013 – Periodic Review of Revision 4 – Reviewed with issues identified for future consideration 08/2005 – DG-1128, Proposed Revision 4 07/1981 – Revision 2 Errata 12/1979 – Draft RS 917-4, Proposed Revision 2 Prior to the issuance of Revision 1, RG 1.97 was entitled "Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant and Environs Conditions During and Following an Accident"	5	05/2019
		4	06/2006
		3	05/1983
		2	12/1980
		1	08/1977
		0	12/1975
1.98	Assumptions Used for Evaluating the Potential Radiological Consequences of a Radioactive Offgas System Failure in a Boiling Water Reactor (for Comment) + HISTORY - HISTORY 06/2026 – Periodic Review – Reviewed with issues identified for future consideration 02/2016 – Periodic Review – Reviewed with issues identified for future consideration 10/2010 – Periodic Review – Reviewed with no issues identified 03/1976 – RG 1.98 Revision 0	0	03/1976	Periodic Review in 2026 – Reviewed with issues identified for future consideration Periodic Review in 2016 – Issues identified for future consideration
1.99	Radiation Embrittlement of Reactor Vessel Materials + HISTORY - HISTORY 02/1986 – Draft ME 305-4, Proposed Revision 2	2	05/1988	Periodic Review – November 2023 - Considerations Technical Letter Report – July 2019 - Considerations Periodic Review – January 2014 – No issues identified
		1	04/1977
		0	07/1975
1.100	Seismic Qualification of Electric and Mechanical Equipment for Nuclear Power Plants + HISTORY - HISTORY 02/2019 – DG-1328, Proposed Revision 4 12/2014 – Periodic Review of Revision 3 – Reviewed with issues identified for future consideration 09/2009 – Periodic Review of Revision 2 – Revise 05/2008 – DG-1175, Proposed Revision 3 08/1987 – Draft EE 108-5, Proposed Revision 2	4	05/2020
		3	09/2009
		2	06/1988
		1	08/1977
		0	03/1976

Page Last Reviewed/Updated Friday, June 12, 2026

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Power Reactors (Division 1): Regulatory Guides 1.81 - 1.100