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-2009-01||Aging Management of Spent Fuel Pool Neutron-Absorbing Materials Other Than Boraflex||Final||A notice of availability of the Final LR-ISG-2009-01 was published in the Federal Register on May 4, 2010 (75 FR 23821 ). This final LR–ISG provides aging management guidance to address the potential loss of material and loss of neutron-absorbing capability of certain nuclear power plant spent fuel pool neutron-absorbing materials.|
|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||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 ).|
|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, FireWater 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 ). This final LR-ISG gives guidance on aging management for internal surfaces, fire water system, atmospheric storage tanks, and corrosion under insulation.|
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.