ML25204A237
| ML25204A237 | |
| Person / Time | |
|---|---|
| Issue date: | 07/23/2025 |
| From: | NRC/RGN-III |
| To: | |
| References | |
| Download: ML25204A237 (1) | |
Text
How License Renewal Inspections Support Licensing
Background
Commercial nuclear power plants in the United States are initially licensed to operate for 40 years. They can apply to extend their licenses through two phases:
Initial License Renewal (LR): Extends operation from 40 to 60 years.
Subsequent License Renewal (SLR): Extends operation from 60 to 80 years.
The NRC carefully evaluates these applications to ensure the plant can safely operate during the period of extended operation (PEO).
This review includes two complementary activities:
- 1. Licensing Actions (Mostly Paper Review)
NRC reviews the license renewal application to ensure the applicant has identified and will manage aging-related degradation of passive SSCs important to safety. This includes:
Reviewing aging management programs (AMPs), time-limited aging analyses (TLAAs), and updates to licensing basis documents.
Assessing environmental impacts and ensuring newly identified SSCs are within scope.
Developing enforceable commitments via license conditions and verifying changes to commitments are properly managed.
Conducting public meetings and stakeholder outreach.
- 2. License Renewal Inspections (Mostly Field Verification)
Pre-Approval Inspection: Verify credited programs and actions are implemented as described in the application; assess the condition of a representative sample of SSCs to evaluate material condition near the end of the original operating period; and confirm proposed license conditions are applicable to actual circumstances and are enforceable once approved. The inspection results are fed back to the licensing review to inform their review.
Post-Approval Inspection Series: Verify license renewal commitments and programs are implemented as approved and assess the effectiveness of AMPs and corrective actions for age-related degradation. These inspections occur in phases: Phases 1-4 for LR and Phases 5-6 for SLR.
o Phase 1 occurs just before entering the PEO to verify readiness. Phases 2-4 confirm LR commitments are implemented both shortly after entering and throughout the PEO. The results of Phases 1-4 are fed back into the licensing review of SLR applications like the pre-approval inspection for LR.
o Phases 5-6 for SLR mirror Phases 1-4: Phase 5 verifies readiness to enter the subsequent PEO, and Phase 6 confirms SLR commitments are implemented during the extended period of operation.
Aging Management Inspections Beyond License Renewal: We also evaluate aspects of SSC aging through the NRCs baseline inspection program. These activities monitor material condition, assess licensee efforts to manage age-related degradation, and verify that programs remain effective in addressing aging effects as the plant continues to operate. While not focused exclusively on aging, these inspections contribute to an overall understanding of the health of important SSCs.
Expanded Information (that elaborates on information contained in one-pager):
Scope of Licensing Reviews The NRC licensing review evaluates whether the plant has identified and will effectively manage aging-related degradation of passive safety-important SSCs. The scope includes:
Aging Management Programs (AMPs): Review whether existing and new programs will detect and address degradation before it impacts safety.
Time-Limited Aging Analyses (TLAAs): Evaluate analyses that assume a specific plant lifetime to ensure they remain valid for the extended period.
Updated Final Safety Analysis Report (UFSAR): Confirm that SSCs within the license renewal scope are properly identified and documented, and AMPs are captured as regulatory commitments.
Environmental Review: Assess potential environmental impacts during the PEO.
License Conditions and Commitments: Develop enforceable requirements based on the application and NRC inspections to ensure safety.