This document provides an overview of the Narora Atomic Power Station (NAPS) in India. It discusses the key components and systems of NAPS, including the reactor layout, uranium fuel bundles, calandria, heavy water moderator, shutdown systems, cooling water, and feed water systems. NAPS utilizes natural uranium fuel and heavy water moderator to generate electricity through nuclear fission, with the heat used to convert water to steam that drives turbines. The document contains detailed specifications and descriptions of how different parts of the nuclear power plant work together.