---
title: "Small Modular Reactors (SMRs): Definition | Model Diplomat"
description: "Small Modular Reactors (SMRs) are factory-fabricated nuclear units under 300 MWe, offering flexible deployment options for energy needs in various regions."
url: "https://modeldiplomat.com/learn/glossary/small-modular-reactors"
---

[New](https://modeldiplomat.com/)

#

Model Diplomat Research Team · Last reviewed June 22, 2026

TL;DR

- Small Modular Reactors are nuclear fission reactors with capacity up to 300 MWe per unit, factory-fabricated as modules and shipped for on-site assembly.
- What capacity threshold defines a Small Modular Reactor?
- How do SMRs differ from conventional large nuclear reactors?
- What is India doing on SMRs?
- Why is HALEU a concern for SMR deployment?

[Civil Service & Diplomatic Exams](https://modeldiplomat.com/learn/civil-services/glossary)Updated June 22, 2026

Small Modular Reactors are nuclear fission reactors with capacity up to 300 MWe per unit, factory-fabricated as modules and shipped for on-site assembly.

Go beyond the definition

## Research Small Modular Reactors (SMRs) like a delegate

Model Diplomat's AI drafts position papers, speeches, and country research with real sources — built for MUN and politics students.

## Research it like a delegate

Research on modeldiplomat.com

## Ask a follow-up about Small Modular Reactors (SMRs)

Open a cited briefing in Model Diplomat search — timelines, positions, and sources you can use in committee or exam answers.

[Start research on Small Modular Reactors (SMRs)](https://modeldiplomat.com/search?q=Explain%20Small%20Modular%20Reactors%20\(SMRs\)%20%E2%80%94%20key%20dates%2C%20actors%2C%20positions%2C%20and%20sources)

Example

India's Union Budget 2025-26, presented by Finance Minister Nirmala Sitharaman, launched a Nuclear Energy Mission committing about ₹20,000 crore to develop at least five indigenous Small Modular Reactors by 2033.

Keep learning

## Go deeper than the definition

[Explore all Civil Service & Diplomatic Exams lessons](https://modeldiplomat.com/learn/civil-services)[Test yourself with a quiz](https://modeldiplomat.com/learn/glossary/quiz/civil-services)

## Take Small Modular Reactors (SMRs) beyond the glossary

Ask the AI research engine built for diplomacy — get briefings, position papers, and speeches with sources you can cite in committee.