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Leveraging Risk Insights For Aging Management At Nuclear Power Plants

Many utilities around the world are pursuing long-term operation (LTO) of their nuclear power plants beyond the initial licensing period. In the United States, the majority of the renewed licenses have allowed the period of operation to be for up to 60 years and a few renewed licenses of up to 80 years of operation, with comparable efforts worldwide. Aging Management Programs (AMPs) are a key element in long-term operation of nuclear power plant and require effective implementation to ensure long-term safety and reliability of vital systems, structures, and components (SSCs). Typically, aging management implementation strategies have been focused on near-term obligations, and these may not be optimal for accomplishing longer-term reliability and sustainability objectives. Therefore, to optimally manage the potential impacts of aging, risk insights can be leveraged using a consistent and sustainable Framework that would focus on high-value actions while reinvesting knowledge and resources. This would allow the implementation of AMPs to enhance and optimize inspection, repair, and mitigation activities.

Product Number: ED22-17189-SG
Author: Emma Wong, Andrew Mantey, Fernando Ferrante, Jessica Brock, Andrew Burgess, Barry Thurston
Publication Date: 2022
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Extending the life expectancy for large industrial assets, such as commercial nuclear reactors, steers aging management programs towards a sustainable, consistent framework that emphasizes high impact activities, while reinvesting technical knowledge and resources towards longer-term aging effects. Aging management program approaches have focused on short- to medium-term aspects that can be challenged by life extension if a re-balancing of the existing and emerging issues over these longer intervals is not considered. In addition, while aging management programs will always be focused on ensuring public health and safety, degradation of integral components, such as cooling water and back-up diesel fuel pipelines, can also have a large impact on lost inventory, service interruptions, and, ultimately, increasing costs to operators and rate payers. This paper will provide an overview of an approach and framework of leveraging risk insights to optimize implementation of aging management programs. The primary focus will be on the consideration of the component-environment degradation mechanisms and the use of operating experience to determine the likelihood of degradation inception and potential failure of components due to those aging effects. This will be discussed in the wider framework of two aging management program pilots which integrates these likelihood and consequence aspects in the wider context of nuclear power plant safety. The overall intent of the framework is to focus on optimized implementation activities (i.e., focus and manage more risk significant aspects to maximize benefits).

Extending the life expectancy for large industrial assets, such as commercial nuclear reactors, steers aging management programs towards a sustainable, consistent framework that emphasizes high impact activities, while reinvesting technical knowledge and resources towards longer-term aging effects. Aging management program approaches have focused on short- to medium-term aspects that can be challenged by life extension if a re-balancing of the existing and emerging issues over these longer intervals is not considered. In addition, while aging management programs will always be focused on ensuring public health and safety, degradation of integral components, such as cooling water and back-up diesel fuel pipelines, can also have a large impact on lost inventory, service interruptions, and, ultimately, increasing costs to operators and rate payers. This paper will provide an overview of an approach and framework of leveraging risk insights to optimize implementation of aging management programs. The primary focus will be on the consideration of the component-environment degradation mechanisms and the use of operating experience to determine the likelihood of degradation inception and potential failure of components due to those aging effects. This will be discussed in the wider framework of two aging management program pilots which integrates these likelihood and consequence aspects in the wider context of nuclear power plant safety. The overall intent of the framework is to focus on optimized implementation activities (i.e., focus and manage more risk significant aspects to maximize benefits).