"World's simplest" nuclear reactors could be installed underground to provide heat to cities

A Finnish startup aims to provide heat using simple nuclear reactors without generating electricity.

: Steady Energy, a Finnish startup, plans to introduce LDR-50, a nuclear reactor designed solely for heat production at a lower operating temperature of 150°C. These reactors, resembling cargo containers, aim to cut down on global emissions by heating water more efficiently and can be buried underground for urban use. Backed by Tractebel, they've signed deals for 15 reactors and aim to begin construction by 2029.

Steady Energy, a startup originating from Finland's VTT research center, is developing the world's simplest commercial nuclear reactor known as LDR-50. Unlike conventional reactors, the LDR-50 focuses solely on heat generation rather than electricity, boasting a thermal output of 50 MW operating at a comfortable 150°C.

These reactors are designed for efficiency, using natural circulation for cooling, and are small enough to fit within a cargo container, allowing them to be installed underground. The intended use for these reactors includes district heating networks, industrial processes, and more, addressing the global emission concern from water heating which accounts for 10% of emissions.

Supported by Belgian firm Tractebel for its nuclear and safety expertise, Steady Energy has secured agreements for 15 of these reactors. As the Finnish nuclear watchdog evaluates the LDR-50, the company anticipates starting construction of their first reactor by 2029, targeting neighborhoods across Finland with an eco-friendly heating solution.

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