Periodic safety review of RSG-GAS: strategy and evaluation to manage research reactor aging

According to the IAEA Research Reactor Database, approximately 50% of the world’s 225 research reactors—including those in Indonesia—have been in operation for over 50 years, with around 20% exceeding 60 years. As research reactors age, their structures, systems, and components (SSCs) are subject to degradation, potentially impacting safety and performance. Operators also face challenges related to outdated instrumentation and support systems that may no longer conform to original specifications. In Indonesia, the national regulatory body (BAPETEN) mandates a Periodic Safety Review (PSR) every ten years to evaluate and ensure continued safe reactor operation. The PSR of the 30 MW GA Siwabessy multi-purpose research reactor (RSG-GAS) reviewed operational, maintenance, and aging management records from 2005 to 2015. Key findings included recurring issues in the power-range neutron detectors and obsolescence in the instrumentation and control systems. A thorough inspection of the aluminum reactor tank liner in 2023, conducted with IAEA support, verified its structural integrity. All recorded incidents were rated at or below Level 1 on the INES scale, with no radiological consequences. The review informed several safety enhancements and aging management strategies, confirming the reactor’s compliance with current safety standards and supporting its continued licensing and operation.