Power Reactors (Division 1): Regulatory Guides 1.121 - 1.140

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	Publish Date	Additional Information
1.121	Bases for Plugging Degraded PWR Steam Generator Tubes (for Comment) – HISTORY 03/2013 – Periodic Review of Revision 0	0	08/1976	Periodic Review – May 2023 – Considerations Reviewed in 2013 – No issues identified
1.122	Development of Floor Design Response Spectra for Seismic Design of Floor-Supported Equipment or Components + HISTORY – HISTORY 05/2019 – Periodic Review of Revision 1 – Reviewed with issues considered for future consideration 03/2015 – Periodic Review of Revision 1 – Revise	1	02/1978	Reviewed in 2019 – Issues identified for future consideration
1.122		0	09/1976
1.123	Quality Assurance Requirements for Control of Procurement of Items and Service for Nuclear Power Plants (Withdrawn -- See 56 FR 36175, 07/31/1991)	W	07/1991
		1	07/1977
		0	10/1976
1.124	Service Limits and Loading Combinations for Class 1 Linear-Type Supports + HISTORY – HISTORY 10/2006 – DG-1168, Proposed Revision 2	3	07/2013	Periodic Review – September 2023 - Revise
		2	02/2007	Periodic Review - March 2013 - Revise
		1	01/1978
		0	11/1976
1.125	Physical Models for Design and Operation of Hydraulic Structures and Systems for Nuclear Power Plants + HISTORY – HISTORY 09/2014 – Periodic Review of Revision 2 – Reviewed with issues for future consideration 03/2009 – Periodic Review of Revision 1 – Revise 07/2008 – DG-1198, Proposed Revision 2	2	03/2009	Reviewed in 2014 – Issues identified for future consideration
		1	10/1978
		0	03/1977
1.126	An Acceptable Model and Related Statistical Methods for the Analysis of Fuel Densification + HISTORY – HISTORY 10/2015 – Periodic Review of Revision 2 – Reviewed with no issues identified 12/2008 – DG-1189, Proposed Revision 2	2	03/2010	Reviewed in 2015 – No issues identified
		1	03/1978
		0	03/1977
1.127	Inspection of Water-Control Structures Associated with Nuclear Power Plants + HISTORY – HISTORY 01/2015 – DG-1245, Proposed Revision 2	2	02/2016
		1	03/1978
		0	04/1977
1.128	Installation Design and Installation of Vented Lead-Acid Storage Batteries for Nuclear Power Plants + HISTORY – HISTORY 01/2024 – DG-1421, Proposed Revision 3 10/2006 – DG-1154, Proposed Revision 2 Prior to the issuance of DG-1154, RG 1.128 was entitled "Installation Design and Installation of Large Lead Storage Batteries for Nuclear Power Plants"	3	04/2024
		2	02/2007	Periodic Review – May 2023 – Revise Periodic Review – May 2013 – No Action
		1	10/1978
		0	04/1977
1.129	Maintenance, Testing, and Replacement of Vented Lead-Acid Storage Batteries for Production and Utilization Facilities + HISTORY – HISTORY 08/2022 – DG-1401, Proposed Revision 4 03/2013 – DG-1269, Proposed Revision 3 10/2006 – DG-1155, Proposed Revision 2 Prior to the issuance of DG-1155, RG 1.129 was entitled "Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Nuclear Power Plants"	4	03/2023
		3	09/2013
		2	02/2007
		1	02/1978
		0	04/1977
1.130	Service Limits and Loading Combinations for Class 1 Plate-and-Shell-Type Component Supports + HISTORY – HISTORY 10/2006 – DG-1169, Proposed Revision 2	3	07/2013	Periodic Review - September 2023 - Revise
		2	03/2007	Periodic Review – March 2013 - Revise
		1	10/1978
		0	07/1977
1.131	Qualification Tests of Electric Cables, Field Splices, and Connections for Light-Water-Cooled Nuclear Power Plants (for Comment) (Withdrawn -- See 74 FR 18000, 04/20/2009) + HISTORY – HISTORY Regulatory Guide 1.131 was replaced by guidance in Regulatory Guide 1.211 08/1979 – Draft RS 050-2, Proposed Revision 1	W	04/2009
1.131		0	08/1977
1.132	Geologic and Geotechnical Site Characterization Investigations for Nuclear Power Plants + HISTORY – HISTORY 08/2021 – DG-1392, Proposed Revision 3 07/2014 – Periodic Review of Revision 2 – Reviewed with no issues identified 02/2001 – DG-1101, Proposed Revision 2	3	12/2021
		2	10/2003
		1	03/1979
		0	09/1977
1.133	Loose-Part Detection Program for the Primary System of Light-Water-Cooled Reactors + HISTORY – HISTORY 04/2015 – Periodic Review of Revision 1 – Reviewed with issues identified for future consideration 01/2015 – Periodic Review of Revision 1 – No issues identified 11/2009 – Periodic Review of Revision 1 – No issues identified	1	05/1981	Reviewed in 2015 – Issues identified for future consideration
1.133		0	09/1977
1.134	Medical Assessment of Licensed Operators or Applicants for Operator Licenses at Nuclear Power Plants + HISTORY – HISTORY 04/2014 – DG-1310, Proposed Revision 4 02/1997 – DG-1068, Proposed Revision 3 11/1984 – Draft OL 401-5, Proposed Revision 2	4	09/2014	Periodic Review – May 2025 – Reviewed with No Issues Identified
		3	03/1998
		2	04/1987
		1	03/1979
		0	09/1977
1.135	Normal Water Level and Discharge at Nuclear Power Plants (for Comment) (Withdrawn -- See 74 FR 39349, 08/06/2009) + HISTORY – HISTORY 08/1979 – Draft RS 050-2, Proposed Revision 1 Regulatory Guide 1.135 was replaced by guidance in Regulatory Guide 1.211	W	08/2009
1.135		0	09/1977
1.136	Design Limits, Loading Combinations, Materials, Construction, and Testing of Concrete Containments + HISTORY – HISTORY 07/2020 – DG-1372, Proposed Revision 4 05/2019 – Periodic Review of Revision 3 – Revise 10/2015 – Periodic Review of Revision 3 – Reviewed with issues identified for future consideration 10/2006 – DG-1159, Proposed Revision 3 Prior to the issuance of DG-1159, RG 1.136 was entitled "Materials, Construction, and Testing of Concrete Containments (Articles CC-1000, ‑2000, and ‑4000 through ‑6000 of the 'Code for Concrete Reactor Vessels and Containments')" 11/1979 – Draft SC 814-5, Proposed Revision 2	4	02/2021
		3	03/2007
		2	06/1981
		1	10/1978
		0	11/1977
1.137	Fuel Oil Systems for Emergency Power Supplies + HISTORY – HISTORY 09/2023 – Periodic Review – Revise 06/2013 – RG 1.137 Revision 2 06/2012 – DG-1282, Proposed Revision 2 Prior to the issuance of DG-1282, RG 1.137 was entitled "Fuel –Oil Systems for Standby Diesel Generators 10/1979 – RG 1.137 Revision 1 01/1978 – RG 1.137 Revision 0	2	06/2013	Periodic Review in 2023 – Revise
		1	10/1979
		0	01/1978
1.138	Laboratory Investigations of Soils and Rocks for Engineering Analysis and Design of Nuclear Power Plants + HISTORY – HISTORY 07/2014 – DG-1256, Proposed Revision 3 08/2001 – DG-1109, Proposed Revision 2	3	12/2014	January 2025 - No issues identified
		2	12/2003
		1	04/2003
		0	04/1978
1.139	Guidance for Residual Heat Removal (for Comment) (Withdrawn -- See 73 FR 32750, 06/10/2008)	W	06/2008
1.139		0	05/1978
1.140	Design, Inspection, and Testing Criteria for Air Filtration and Adsorption Units of Normal Atmosphere Cleanup Systems in Light-Water-Cooled Nuclear Power Plants + HISTORY – HISTORY 06/2012 – DG-1280, Proposed Revision 3 10/2000 – DG-1103, Proposed Revision 2	3	08/2016
		2	06/2001
		1	10/1979
		0	03/1978

Page Last Reviewed/Updated Thursday, June 11, 2026

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Power Reactors (Division 1): Regulatory Guides 1.121 - 1.140