How do Small Modular Reactors differ from conventional nuclear plants, and what advantages do they offer for India's decarbonisation goals?

Q. How do Small Modular Reactors differ from conventional nuclear plants, and what advantages do they offer for India's decarbonisation goals? (15 marks, 250 words)

Small Modular Reactors (SMRs) — factory-built units under ~300 MWe — mark a design shift from large gigawatt-scale plants. India's Nuclear Energy Mission (Union Budget 2025–26), targeting 100 GWe by 2047, leans on ≥5 indigenous SMRs by 2033 to complement conventional reactors [1].

How SMRs differ from conventional plants - Scale & modularity: small, factory-fabricated modules shipped and assembled on-site, versus large bespoke construction like NPCIL's Pressurised Heavy Water Reactors [1]. - Siting: compact footprint allows deployment near industry or on retired thermal-plant sites; BSMR-200 (220 MWe) and SMR-55 (55 MWe) approved for Tarapur [1]. - Capital & time: lower upfront cost and shorter build cycles reduce financing risk of multi-decade megaprojects. - Safety: passive cooling and smaller cores lower off-site emergency risk. - Application diversity: beyond power — BARC's HTGCR (5 MWth) supplies process heat for hydrogen production [1].

Advantages for India's decarbonisation - Firm clean baseload: dispatchable low-carbon power complements variable solar/wind, aiding net-zero by 2070 [1]. - Hard-to-abate sectors: process heat and nuclear hydrogen decarbonise steel, refining, fertilisers via HTGCR [1]. - Coal-plant replacement: SMRs can reuse existing grid and land, easing a just transition. - Private participation: the SHANTI Act, 2025 opens the sector beyond DAE, mobilising capital for the 46 GW non-NPCIL share [2].

By marrying modular scalability with process-heat versatility, SMRs let India expand nuclear capacity flexibly and affordably — a strategic pillar for its 2047 energy-security and 2070 net-zero commitments.

(~250 words)

Sources: 1. PIB — Parliament Question: Nuclear Mission (Department of Atomic Energy) — 100 GWe by 2047 target, ≥5 SMRs by 2033, BSMR-200/SMR-55/HTGCR designs and hydrogen use, net-zero 2070 linkage 2. PIB — A New Chapter in India's Nuclear Journey (SHANTI Act, 2025) — SHANTI Act opening the sector to private/non-DAE participation