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License Renewal Interim Staff Guidance (LR-ISG)

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LR-ISG Process

The NRC staff develops LR-ISGs in accordance with the LR-ISG Process, Revision 2, for which a notice of availability was published in the Federal Register on June 22, 2010 (75 FR 35510).  This process describes the basic framework for developing and implementing LR-ISGs, and it was developed with input from stakeholders. Under the process, the NRC staff may evaluate proposed changes to certain license renewal guidance documents and then, if warranted, implement a guidance document change through issuance of an LR-ISG. The NRC staff or stakeholders may propose changes to certain license renewal guidance documents. The process provides for interactions with stakeholders during LR-ISG development and the NRC staff provides the opportunity for public comment on each proposed LR-ISG through notices published in the Federal Register.

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Current LR-ISG Topics

Number Topic Status Comments
LR-ISG-2011-01 Aging Management of Stainless Steel Structures and Components in Treated Borated Water, Revision 1 Final A notice of availability of the Final LR-ISG-2011-01 was published in the Federal Register on December 18, 2012 (77 FN 74883 exit icon). This final LR-ISG clarifies the staff's existing position on Aging Management in Treated Borated Water.
LR-ISG-2011-02 Aging Management Program for Steam Generators Final A notice of availability of the Final LR-ISG-2011-02 was published in the Federal Register on December 1, 2011 (76 FR 74834 exit icon). The guidance evaluates the suitability of using Rev. 3 of NEI 97-06 for implementing their steam generator aging management program.
LR-ISG-2011-03 Generic Aging Lessons Learned (GALL) Report Revision 2 AMP XI.M41, "Buried and Underground Piping and Tanks" Final A notice of availability for the Final LR-ISG-2011-03 was published in the Federal Register on August 2, 2012 (77 FR 46127 exit icon). This final LR-ISG gives additional guidance on buried and underground piping and tanks.
LR-ISG-2011-04 Updated Aging Management Criteria for Reactor Vessel Internal Components of Pressurized Water Reactors Final A notice of availability of the Final LR-ISG-2011-04 was published in the Federal Register on June 3, 2013 (78 FR 33120 exit icon).
LR-ISG-2011-05 Ongoing Review of Operating Experience Final A notice of availability of the Final LR-ISG-2001-05 was published in the Federal Register on March 16, 2012 (77 FR 15818 exit icon). This final LR-ISG clarifies the staff's existing position on the ongoing review of both plant-specific and industry operating experience.
LR-ISG-2012-01 Wall Thinning Due to Erosion Mechanisms Final A notice of availability of the Final LR-ISG-2012-01  was published in the Federal Register on May 1, 2013 (78 FN 25487 exit icon). This final LR-ISG gives additional guidance on aging management for wall thinning due to erosion mechanisms.
LR-ISG-2012-02 Aging Management of Internal Surfaces, Fire Water Systems, Atmospheric Storage Tanks, and Corrosion Under Insulation Final A notice of availability of the Final LR-ISG-2012-12 was published in the Federal Register on Nov. 22, 2013 (78 FN 226 exit icon). This final LR-ISG gives guidance on aging management for internal surfaces, fire water system, atmospheric storage tanks, and corrosion under insulation.
LR-ISG-2013-01 Aging Management of Loss of Coating or Lining Integrity for Internal Coatings/Linings on In-Scope Piping, Piping Components, Heat Exchangers, and Tanks Final A notice of availability of the Final LR-ISG-2013-01 was published in the Federal Register on Nov. 14, 2014 (79 FN 220 exit icon).

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Previous LR-ISG Topics

A summary of the NRC staff's resolutions of LR-ISGs from 2001 through 2005 is available in a letter, "Summary of the 2001-2005 Interim Staff Guidance for License Renewal," dated February 6, 2007.

A summary of the NRC staff's resolutions of LR-ISGs from 2005 through 2010 is available in Section A.2, “Staff Technical Positions,” Table A-8, “Summary of Changes to the Updated License Renewal Documents as a Result of License Renewal Interim Staff Guidance (LR-ISG)” of NUREG-1950, “Disposition of Public Comments and Technical Bases for Changes in the License Renewal Guidance Documents NUREG-1801 and NUREG-1800,” dated April 2011.

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Page Last Reviewed/Updated Wednesday, November 19, 2014