ML22140A328
| ML22140A328 | |
| Person / Time | |
|---|---|
| Issue date: | 03/08/2022 |
| From: | Lauren Gibson NRC/NRR/DNRL |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML22140A328 (11) | |
Text
Risk-Informing License Renewal:
Exploring the Potential Lauren Gibson, Branch Chief License Renewal Projects Branch Division of New and Renewed Licenses U.S. Nuclear Regulatory Commission Opportunities during Licensing
Can licensees use formal risk insights, such as probabilistic risk assessment (PRA) or 10 CFR 50.69, as part of the license renewal application?
While the Commission believes that the methodology for conducting an integrated plant assessment needed to ensure that aging of SSCs
[structures, systems, and components] is appropriately managed should emphasize deterministic approaches, the Commission also acknowledges that PRA techniques could be used as a supplemental tool in the renewal applicant's integrated plant assessment..... [However,] probabilistic assessment alone is not an acceptable basis for the exclusion of SSCs to be evaluated....
Statements of Consideration for 1991 License Renewal Rule (56 FR 64943)
Regulatory Basis
Opportunities for Use in Licensing?
uAssessment of aging management review line items uEnhancements or exceptions within aging management programs uScoping and screening (exemption required)
Aging Management Review Line Items u A line could also indicate the 10 CFR 50.69 risk categorization level uNot every item would fit neatly into a categorization uInformation for each SSC may not be readily available u NRC review effort could then consider risk categorization level u Open QuestionExactly how applicable is PRA to the period of extended operation?
Aging Management Programs u Use risk information (risk categorization or PRA results) to support enhancements or exceptions u The risk information could allow modifications to the way that an aging effect is managed (e.g., more or fewer inspections)
Scoping and Screening u Deterministic process is part of the rule u Potential for risk information to be used to seek an exemption u to exclude a normally included SSC on an individual level u to have an alternative method of scoping and screening entirely u Exemption would have the most impact on the application but may be hard to justify u Exemption would take significantly more effort than risk-informing how the aging effects are managed
At the Licensing Stage uAging management review line items uEnhancements or exceptions within aging management programs uScoping and screening
10 CFR 50.59 governs the approach to changing aging management program commitments.
What if the renewed license has already been issued?
The NRCs Next Steps
The NRC has not formally reviewed or approved the processes described in the industry presentations today.
Industrys Next Steps