'CANDU' प्रकार के मंद तापीय परमाणु रिएक्टरों (slow thermal nuclear reactors) द्वारा मंदक (moderator) के रूप में निम्नलिखित में से किसका उपयोग किया जाता है?

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.