The International Atomic Energy Agency (IAEA) has conducted a follow-up mission focusing on aspects of the safe long-term operation of Sweden’s Oskarshamn 3 nuclear power unit, continuing its work to support nuclear safety and the reliable operation of existing nuclear facilities.

The mission follows a similar assessment conducted two years earlier, providing an opportunity to revisit key aspects of long-term operational safety and examine the measures being applied at the facility.

Oskarshamn 3 is one of Sweden’s nuclear power units and plays a role in the country’s electricity generation system. As nuclear facilities operate over extended periods, systematic assessments and maintenance programmes become increasingly important for ensuring that equipment, structures and safety systems continue to perform as intended.

The IAEA’s work on long-term operation focuses on technical and organisational considerations associated with keeping nuclear power plants operating safely beyond their initially established operating periods, where permitted by national regulations. Such assessments can cover equipment ageing, maintenance practices, safety management and the continued suitability of systems that are important to nuclear safety.

Ageing management is a particularly important element of long-term nuclear operation. Components can experience wear, material degradation and other changes over time. Operators therefore need appropriate inspection, monitoring, testing and maintenance arrangements to identify potential issues and address them before they compromise safety.

Follow-up missions also provide an opportunity to examine progress since previous assessments. Comparing current practices with earlier findings can help identify areas requiring continued attention and support improvements in operational procedures.

The IAEA works with countries and nuclear facility operators to promote the application of international nuclear safety standards and the exchange of technical experience. Its missions can provide independent expert perspectives, although the specific findings and recommendations of an individual mission depend on the scope of the assessment and the evidence examined.

For Sweden, maintaining high safety standards at existing nuclear facilities is an important consideration as the country addresses its long-term electricity needs. Nuclear power can provide electricity with low operational greenhouse gas emissions, but its continued use requires rigorous safety oversight, effective regulation and responsible management throughout a facility’s operating life.

The latest mission at Oskarshamn 3 underscores the importance of repeated technical scrutiny rather than treating an earlier assessment as a permanent assurance of safety. The detailed outcome of the mission would be needed to determine which practices were confirmed, what improvements were recommended and whether any outstanding issues require further action.