Ageing Management of Nuclear Power Plants during Delayed Construction Periods, Extended Shutdown and Permanent Shutdown Prior to Decommissioning

This publication provides a summary of internationally accepted practices for ageing management in nuclear power plants, including extended shutdown, delayed construction, and post-final shutdown periods. It is intended for use by regulatory bodies, operating organizations, manufacturers, designers, and technical support organizations.

Format: Paperback / softback
Length: 126 pages
Publication date: 30 June 2021
Publisher: IAEA

This publication, as part of the International Generic Ageing Lessons Learned (IGALL) program run by the IAEA, offers a concise overview of internationally recognized practices related to aging management in nuclear power plants. It provides examples of national approaches to managing aging during extended shutdowns, delayed construction, and post-final shutdown phases, as applied in participating IGALL Member States' nuclear power plants. Additionally, certain aspects of the information are relevant for assessing aging effects before and after restarting operations. The publication supplements existing IAEA publications on aging management strategies during normal operation and is designed to be utilized by regulatory bodies, operating organizations, manufacturers, designers, and technical support organizations.

Introduction:
The aging of nuclear power plants is a significant concern as they continue to operate for extended periods. The effects of aging on plant components, such as materials, structures, and systems, can lead to reduced reliability, increased maintenance costs, and potential safety hazards. As part of the IGALL program, the IAEA has undertaken efforts to gather and share knowledge on aging management practices across Member States. This publication aims to provide a comprehensive overview of internationally accepted practices in this field.

National Approaches to Aging Management:
The publication presents examples of national approaches to aging management for different phases of a nuclear power plant's lifecycle. These approaches include strategies for managing aging during extended shutdowns, delays in construction, and post-final shutdown. Each approach is tailored to the specific requirements and challenges of the respective Member State.

Extended Shutdowns:
During extended shutdowns, plants are typically shut down for maintenance and repairs. This period can last for several years, depending on the age and condition of the plant. During this time, various measures are taken to manage aging, such as conducting regular inspections, performing maintenance activities, and implementing corrosion control measures.

Delayed Construction:
Delayed construction can occur due to various factors, such as economic constraints, regulatory delays, or unforeseen circumstances. In such cases, plants may need to be designed and constructed to accommodate the effects of aging. This includes incorporating design modifications, using advanced materials, and implementing additional safety measures.

Post-Final Shutdown:
After a nuclear power plant's operational life ends, it may be decommissioned and dismantled. During this phase, special attention is given to managing aging and ensuring the safe disposal of radioactive waste. This includes conducting decommissioning activities, removing radioactive materials, and implementing waste management strategies.

Applicability to Other Phases:
While the examples presented in the publication focus on extended shutdowns, delayed construction, and post-final shutdown, some of the information is also applicable to the evaluation of aging effects prior to and after restarting operation. This includes assessing the condition of plant components, developing maintenance plans, and implementing safety measures to mitigate the effects of aging.

Conclusion:
This publication provides valuable insights into internationally accepted practices in aging management for nuclear power plants. It serves as a reference for regulatory bodies, operating organizations, manufacturers, designers, and technical support organizations. By implementing these practices, nuclear power plants can improve their reliability, reduce maintenance costs, and enhance safety. The IAEA continues to support Member States in their efforts to manage aging and ensure the long-term sustainability of nuclear power generation.

Weight: 350g
Dimension: 297 x 210 (mm)
ISBN-13: 9789201079213