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Interim Staff Guidance Associated with Combined License (COL), Design Certification (DC), and Early Site Permit (ESP) Applications for New Reactors

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Issued ISGs
Interim Staff Guidance (ISG) Number	Title	Status/Comment
DC/COL-ISG-01	Interim Staff Guidance on Seismic Issues Associated with High Frequency Ground Motion in Design Certification and Combined License Applications	OPEN No decision has been made on how to incorporate this into permanent guidance. Draft Interim Staff Guidance on Seismic Issues (ML072200566) was provided for public comments on August 16, 2007. Interim Staff Guidance was issued on May 27, 2008 (73 FR 30425).
DC/COL-ISG-02	Interim Staff Guidance on Financial Qualifications of Applicants For Combined License Applications	OPEN No decision has been made on how to incorporate this into permanent guidance. Interim Staff Guidance was issued on May 8, 2008 (73 FR 26151).
DC/COL-ISG-03	Interim Staff Guidance Probabilistic Risk Assessment Information to Support Design Certification and Combined License Applications	CLOSED Draft Interim Staff Guidance on Probabilistic Risk Assessment (ML080370218) was provided for public comments on February 12, 2008. Interim Staff Guidance was issued on June, 17, 2008 (73 FR 34347). This interim staff guidance was incorporated into Revision 3 to Section 19.0 of NUREG-0800 dated December 2015. This ISG was closed on May 17, 2019 (84 FR 22523).
COL/ESP-ISG-04	Interim Staff Guidance on Definition of Construction and on Limited Work Authorizations	CLOSED Interim Staff Guidance was issued on February 17, 2009 (74 FR 7488). This interim staff guidance was incorporated into Regulatory Guide 1.206, Revision 1 on October 12, 2018 (83 FR 51712).
DC/COL-ISG-05	Interim Staff Guidance on the use of the GALE86 Code for Calculation of Routine Radioactive Releases in Gaseous and Liquid Effluents to Support Design Certification and Combined License Applications	OPEN The staff plans to update NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Chapter 11. Draft Interim Staff Guidance on GALE86 Code was published for comment on March 25, 2008 (73 FR 15796). Interim Staff Guidance was issued on July 17, 2008 (73 FR 41129).
DC/COL-ISG-06	Final Interim Staff Guidance Evaluation and Acceptance Criteria for 10 CFR 20.1406 to Support Design Certification and Combined License Applications	CLOSED Interim Staff Guidance was issued on October 9, 2009 (74 FR 52267). Guidance has been incorporated into NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 12.3-12.4, Revision 5 on October 30, 2013 (78 FR 59982).
DC/COL-ISG-07	Interim Staff Guidance on Assessment of Normal and Extreme Winter Precipitation Loads on the Roofs of Seismic Category I Structures	OPEN The staff plans to update NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 2.3.1. Draft Interim Staff Guidance DC/COL-ISG-07 was publish for comment on August 22, 2008 (73 FR 49712). Interim Staff Guidance was issued on July 1, 2009 (74 FR 31470).
DC/COL-ISG-08	Final Interim Staff Guidance Necessary Content of Plant-Specific Technical Specifications When a Combined License Is Issued	CLOSED Draft Interim Staff Guidance DC/COL-ISG-08 was publish for comment on October 16, 2008 (73 FR 61443). Interim Staff Guidance was issued on December 17, 2008 (73 FR 76685). This interim staff guidance was incorporated into Regulatory Guide 1.206, Revision 1 on October 12, 2018 (83 FR 51712).
DC/COL-ISG-010	Interim Staff Guidance Review of Evaluation to Address Adverse Flow Effects in Equipment Other than Reactor Internals	OPEN The staff plans to update Regulatory Guide 1.20, “Comprehensive Vibration Assessment Program for Reactor Internals During Pre-Operational and Initial Startup Testing” and NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 3.9.2, “Dynamic Testing and Analysis of Systems, Structures, and Components,” and Section 3.9.5, “Reactor Pressure Vessel Internals.” Draft Interim Staff Guidance DC/COL-ISG-010 was publish for comment on March 16, 2009 (74 FR 11137). Interim Staff Guidance was issued on November 12, 2009 (74 FR 58323).
DC/COL-ISG-011	Interim Staff Guidance Finalizing Licensing-basis Information	CLOSED Draft Interim Staff Guidance DC/COL-ISG-011 was publish for comment on June 6, 2009 (74 FR 26894). Interim Staff Guidance was issued on November 9, 2009 (74 FR 57715). This interim staff guidance was incorporated into Regulatory Guide 1.206, Revision 1 on October 12, 2018 (83 FR 51712).
DC/COL-ISG-013	Assessing the Radiological Consequences of Accidental Releases of Radioactive Materials from Liquid Waste Tanks for Combined License Applications	OPEN The NRC staff intends to incorporate these final ISGs into the next revision of RG 1.206 and NUREG-0800. Draft Interim Staff Guidance DC/COL-ISG-013 was publish for comment on May 4, 2009 (74 FR 20510) and on February 24, 2010 (75 FR 8411). Staff Guidance was issued on January 29, 2013 (78 FR 6149).
DC/COL-ISG-014	Assessing the Radiological Consequences of Accidental Releases of Radioactive Materials from Liquid Waste Tanks in Ground and Surface Waters for Combined License Applications	OPEN The NRC staff intends to incorporate these final ISGs into the next revision of RG 1.206 and NUREG-0800. Draft Interim Staff Guidance DC/COL-ISG-014 was publish for comment on February 24, 2010 (75 FR 8412). Interim Staff Guidance was issued on January 29, 2013 (78 FR 6149).
ESP/DC/COL-ISG-015	Interim Staff Guidance on Post-Combined License Commitments	CLOSED Draft Interim Staff Guidance ESP/DC/COL-ISG-015 was publish for comment on October 27, 2009 (74 FR 55274). Interim Staff Guidance was issued on February 2, 2010 (75 FR 5356). This interim staff guidance was incorporated into Regulatory Guide 1.206, Revision 1 on October 12, 2018 (83 FR 51712).
DC/COL-ISG-016	Compliance with 10 CFR 50.54(hh)(2) and 10 CFR 52.80(d)	CLOSED Interim Staff Guidance was issued on June 9, 2010 (non-public) Guidance was incorporated into NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 19.4 on July 8, 2015 (80 FR 39163)
DC/COL-ISG-017	Interim Staff Guidance on Ensuring Hazard-Consistent Seismic Input for Site Response and Soil Structure Interaction Analyses	OPEN The staff plans to update Regulatory Guide 1.206, “Combined License Applications for Nuclear Power Plants (LWR Edition)” and NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 2.5 and Section 3.7 Draft Interim Staff Guidance DC/COL-ISG-017 was publish for comment on August 31, 2009 (74 FR 44879). Interim Staff Guidance was issued on March 31, 2010 (75 FR 16202).
DC/COL-ISG-018	Interim Staff Guidance on Standard Review Plan, Section 17.4, “Reliability Assurance Program”	CLOSED Draft Interim Staff Guidance DC/COL-ISG-018 was publish for comment on October 30, 2009 (74 FR 56243). Interim Staff Guidance was issued on March 28, 2011 (76 FR 17159). Guidance was incorporated into NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 17.4 on July 10, 2014 (79 FR 33220).
DC/COL-ISG-019	Final Interim Staff Guidance Review of Evaluation to Address Gas Accumulation Issues in Safety Related Systems and Systems Important to Safety	OPEN The staff plans to update NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 5.4.7, “Residual Heat Removal System,” Section 6.3, “Emergency Core Cooling System,” and Section 6.5.2, “Containment Spray System” Draft Interim Staff Guidance DC/COL-ISG-019 was publish for comment on November 12, 2009 (74 FR 58323). Interim Staff Guidance was issued on September 22, 2011 (76 FR 58846).
DC/COL-ISG-020	Interim Staff Guidance on Implementation of a Probabilistic Risk Assessment-Based Seismic Margin Analysis for New Reactors	OPEN The NRC staff plans to update Regulatory Guide 1.206, “Combined License Applications for Nuclear Power Plants (LWR Edition)” and NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 19.0 . Note: This ISG contains guidance for COL holders which has not been superseded by SRP 19.0, Revision 3. Draft Interim Staff Guidance DC/COL-ISG-020 was publish for comment on October 16, 2009 (74 FR 53307). Interim Staff Guidance was issued on March 22, 2010 (75 FR 13610).
DC/COL-ISG-021	Final Interim Staff Guidance Review of Nuclear Power Plant Designs using a Gas Turbine Driven Standby Emergency Alternating Current Power System	OPEN The staff plans to update Regulatory Guide 1.206, “Combined License Applications for Nuclear Power Plants (LWR Edition)”and NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Section 8.3.1 and Sections 9.5.4 through 9.5.8. Draft Interim Staff Guidance DC/COL-ISG-021 was publish for comment on February 3, 2010 (75 FR 5632). Interim Staff Guidance was issued on March 28, 2011 (76 FR 17160).
DC/COL-ISG-022	Interim Staff Guidance on Impact of Construction (under a Combined License) of New Nuclear Power Plant Units on Operating Units at Multi-Unit Sites	OPEN The staff plan to update Regulatory Guide 1.206, “Combined License Applications for Nuclear Power Plants (LWR Edition)”and NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition”: Chapter 1.0. Draft Interim Staff Guidance DC/COL-ISG-022 was publish for comment on February 14, 2011 (76 FR 8383). Interim Staff Guidance was issued on May 18, 2012 (77 FR 29701).
DC/COL-ISG-024	Implementation of Regulatory Guide 1.221 on Design-Basis Hurricane and Hurricane Missiles	OPEN Regulatory Guide 1.206 no longer includes details on what to include in application. Will include recommended updates into SRP 2.3.1 with pointers to SRP chapter 3 as recommended on Page 9 of 11 in ISG. Draft Interim Staff Guidance DC/COL-ISG-024 was publish for comment on October 22, 2012 (77 FR 64564). Interim Staff Guidance was issued on May 24, 2013 (78 FR 31614).
DC/COL-ISG-025	Interim Staff Guidance on Changes During Construction Under 10 CFR Part 52	OPEN The staff plans to create a new regulatory guide or update of Regulatory Guide 1.187, “Guidance for Implementation of 10 CFR 50.59, Changes, Tests, and Experiments.” Draft Interim Staff Guidance DC/COL-ISG-025 and DC/COL-ISG-025 was publish for comment on January 11, 2012 (77 FR 1749) and August 15, 2013 (78 FR 49782) respectively. Interim Staff Guidance was issued on September 11, 2015 (80 FR 48351).
COL/ESP-ISG-026	Interim Staff Guidance on Environmental Issues Associated with New Reactors	OPEN The staff plans on updating NUREG-1555, Environmental Standard Review Plan: “Standard Review Plans for Environmental Reviews for Nuclear Power Plants.” Draft Interim Staff Guidance COL/ESP-ISG-026 was publish for comment on November 13, 2013 (78 FR 68101). Interim Staff Guidance was issued on September 3, 2014 with an effective date of October 3, 2014 (79 FR 52373).
COL/ESP-ISG-027	Specific Environmental Guidance for Light Water Small Modular Reactor Reviews	OPEN The staff plans to incorporate this guidance into the next revision of the Environmental Standard Review Plan and related guidance documents. Interim Staff Guidance was issued on September 5, 2014 with an effective date of October 6, 2014 (79 FR 53083).
DC/COL-ISG-028	Interim Staff Guidance on Assessing the Technical Adequacy of the Advanced Light-Water Reactor Probabilistic Risk Assessment for the Design Certification Application and Combined License Application	OPEN The staff intends to incorporate this guidance into the next revision of Regulatory Guide (RG) 1.200, Revision 2, “An Approach for Determining the Technical Adequacy of Probabilistic Risk Assessment Results for Risk-Informed Activities” (ADAMS Accession No. ML090410014), RG 1.206, “Combined License Applications for Nuclear Power Plants” (ADAMS Accession No. ML070720184), and NUREG-0800, “Standard Review Plan (SRP) for the Review of Safety Analysis Reports for Nuclear Power Plants,” SRP Section 19.0 “Probabilistic Risk Assessment and Severe Accident Evaluation for New Reactors” (ADAMS Accession No. ML12132A481). Draft Interim Staff Guidance DC/COL-ISG-028 was publish for comment on November, 26, 2014 (79 FR 70575). Interim Staff Guidance was issued on December 2, 2016 (81 FR 87083).
COL-ISG-029	Environmental Considerations Associated with Micro-reactors	OPEN No decision has been made on how to incorporate this into permanent guidance. Draft Interim Staff Guidance COL-ISG-029 was publish for comment on February 26, 2020 (85 FR 11127). Interim Staff Guidance was issued on October 28, 2020 (85 FR 68372).

Page Last Reviewed/Updated Monday, May 08, 2023