License Renewal Interim Staff Guidance (LR-ISG)
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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.
Current LR-ISG Topics
|LR-ISG-2006-03||Staff Guidance For Preparing Severe Accident Mitigation Alternatives Analyses||Final||A notice of availability of the Final LR-ISG-2006-03 was published in the Federal Register on August 14, 2007 (72 FR 45466 ). The final LR-ISG recommends that applicants for license renewal follow the guidance provided in NEI 05-01, Revision A, "Nuclear Energy Institute Severe Accident Mitigation Alternatives (SAMA) Analysis Guidance Document," dated November 2005 when preparing SAMA analyses as part of a license renewal application.|
|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 ). 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 ). 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 ). 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||Draft||A notice of request for public comment on Draft LR-ISG-2011-04 and accompanying Appendices was published in the Federal Register on March 20, 2012 (77 FR 16270 ). The public has until May 21, 2012 to comment on the draft LR-ISG.|
|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 ). 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 ). 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, Service Level III and Other Coatings, Atmospheric Storage Tanks, and Corrosion Under Insulation||Draft||A notice of request for public comment on Draft LR-ISG-2012-02 was published in the Federal Register on April 12, 2013 (78 FR 21980 ). The public has until June 16, 2013 to comment on the draft LR-ISG.|
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.