An International Atomic Energy Agency (IAEA) team of experts today completed a review of long-term operational safety at the Oskarshamn Nuclear Power Plant (NPP) Unit 3 in Sweden.
The Safety Aspects of Long Term Operation (SALTO) review mission was requested by the plant operator, OKG. The 11-member team, which began its review on 28 November, focused on aspects essential to the safe Long-Term Operation (LTO) of Unit 3, which was put in commercial operation in 1985 with a design life of 40 years. The plant operator is making preparations to extend the operating lifetime to 60 years. The Swedish Radiation Safety Authority (SSM) requires a Periodic Safety Review (PSR) to be performed every 10 years.
The SALTO team – comprised of experts from Argentina, Belgium, Bulgaria, the Czech Republic, Finland, France, India, the Netherlands and the IAEA – reviewed the plant’s organization and programmes related to LTO, including human resources and knowledge management. The findings of SALTO missions are based on IAEA safety standards.
The IAEA team observed that the plant has made progress in the field of ageing management and initiated many activities to prepare for safe LTO. It also made several recommendations and suggestions for further enhancements based on IAEA safety standards. The plant’s LTO project includes several topics recommended by the IAEA safety standards.
The team identified several good performances that will be shared with the nuclear industry globally, including:
●The plant carries out periodic management reviews of major tasks including ageing management.
●The plant uses a comprehensive in-service inspection management database.
●The plant has a long-term contract for specific electrical spare parts.
The team provided several recommendations for improvements to LTO safety, including:
●The plant should implement a clear and consistent process to demonstrate preparedness for safe LTO.
●The plant should improve the identification of SSCs (structures, systems and components) within the scope for LTO assessment.
●The plant should ensure that the water chemistry programme effectively manages potential ageing effects during LTO.
The plant management said it was committed to implementing the recommendations and requested that the IAEA schedule a second mission in the first quarter of 2020.
The team provided a draft report to the plant management. The plant and SSM will have an opportunity to make factual comments on the draft. A final report will be submitted to the plant, SSM and the Swedish Government within three months.
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