भारत के तीन चरणों वाले परमाणु ऊर्जा कार्यक्रम की रूपरेखा किसने तैयार की थी?

Which atomic power station in India is fully indigenously built?

Consider the following statements: Assertion (A): India adopted a three-stage nuclear power programme to ensure long-term energy security. Reason (R): India possesses abundant uranium reserves but limited thorium resources, which can be effectively utilised only after developing advanced reactor technologies.