Interim Staff Guidance
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The NRC issued the Final License Renewal Interim Staff Guidance (LR-ISG), LR-ISG-2011-04, “Updated Aging Management Criteria for Reactor Vessel Internal Components for Pressurized Water Reactors.” LR-ISG-2011-04 updates the guidance in NUREG 1800, Revision 2 and NUREG 1801, Revision 2 to ensure consistency with Electric Power Research Institute (EPRI) Technical Report No. 1022863, “Material Reliability Program: Pressurized Water Reactor Internals Inspection and Evaluation Guidelines” (MRP-227-A). It provides a framework to ensure that Pressurized Water Reactor (PWR) license renewal applicants will adequately address age-related degradation and aging management of reactor vessel internal components during the term of the renewed license.