The Indira Gandhi Centre for Atomic Research (IGCAR) celebrated the 40th anniversary of the Fast Breeder Test Reactor’s (FBTR) First Criticality on October 18, 2025, marking a significant milestone in India’s nuclear energy journey. The FBTR, operational since 1985, has been pivotal in advancing India’s fast reactor program, showcasing the nation’s indigenous capabilities in nuclear technology and reinforcing its commitment to energy self-reliance. During the event, notable achievements, including the successful separation of Phosphorus-32 for radiopharmaceutical applications, were highlighted, emphasizing FBTR’s expanding utility in societal health applications. This celebration reaffirms India’s dedication to mastering advanced nuclear technology, crucial for achieving energy security and promoting sustainable development.