IAEA Nuclear Energy, Nuclear Power Operations, Nuclear Power Plants, NPPs, Safety Measures, Maintenance, Repair, Reliability, Ageing Management, Tank Systems, Underground Piping Systems, Age-Related Degradation, Condition Assessments, Tank Material, Components, Operators, Designers, Engineers, Plant Owners, Tank Description, Applications, Handling Systems, Sewage, Drains, Collection, Gas, Fuel, Electrical System, Service Life, Ageing Management Programmes, AMPs, Techniques, Monitoring, Mitigation, Calibration, Surveillance, Leak Detection, Remedial Measures, Life Cycle, Research, Lessons Learned, Plant Personnel, Member States, Health, Design, Qualification, Failure Analysis, Environment, Lifetime Management, Buried Pipelines, Operating Experience, Development, Training, Documentation, Safety Margins