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India’s first indigenous nuclear-powered ballistic missile submarine, INS Arihant was captured in Satellite imagery at the Maintenance Dy dock in Vishakhapatnam dated November 2022 for the first time. Speculation is that INS Arihant is there for its first Refueling and Overhaul (ROH), a process of Refueling, or replacing the enriched uranium fuel rods, of the submarine reactor.

ROH is a complex dockyard operation that can take anywhere from 18 to 24 months. As per General information, Arihant’s Pressurized water reactor (83 MW) has a Refuelling cycle of 6-7 years, or at 65% capacity factor refuelling is every 7-10 years, with overhaul at 20 years.

INS Arihant was launched in 2009 and the reactor went critical in 2013. In 2018, INS Arihant completed its first deterrence patrol in an undisclosed region of the Indian Ocean Region (IOR). The pressurized water reactor (83 MW) developed for the Arihant class submarine and S4 class submarine is based on the Russian design symmetries and requires a Refuelling cycle of 6-7 years.

Nuclear-powered ballistic missile submarine that carries out long-distance patrols and is designed to stay away from its coastal zone to prevent early detection so has to maintain the country’s nuclear triad burn-out reactor life. India’s second-generation pressurized water reactor for the S5 class submarines might have a longer Refuelling cycle of 10-12 years by reducing the cost of the operation.

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