Context: The Department of Atomic Energy (DAE) has inaugurated the world’s first nuclear heat-based hydrogen production facility at IGCAR, Kalpakkam, Tamil Nadu.
- It uses heat from the Fast Breeder Test Reactor (FBTR) to produce hydrogen through an indigenous Copper–Chlorine (Cu–Cl) thermochemical water-splitting process.
About The Nuclear Heat-Based Cu–Cl Hydrogen Facility:
What It Is?
- The facility is a pioneering, carbon-free technology demonstrator that bridges nuclear engineering and chemical looping to generate clean hydrogen. Rather than relying on power-hungry water electrolysis, it directly consumes high-temperature volcanic-scale process heat from a nuclear core to chemically split water into hydrogen and oxygen.
Collaborative Development:
The facility represents an absolute triumph of indigenous multi-agency coordination:
- The Core Technology: The Copper–Chlorine (Cu–Cl) thermochemical chemical cycle was conceptualized and developed indigenously by the Bhabha Atomic Research Centre (BARC) in Mumbai.
- The Reactor Interface & Commissioning: The structural design, interface fabrication, and site-level commissioning were executed jointly by BARC and IGCAR at Kalpakkam.
Aim:
- To advance India’s signature three-stage nuclear power programme by establishing a non-electric, industrial application for fast breeder reactors.
- To demonstrate a highly continuous, scalable, and climate-neutral pathway to support India’s long-term energy security and clean hydrogen production goals.
How the Cu–Cl Thermochemical Cycle Works?
- Hydrogen Production: Copper (Cu) reacts with dry hydrogen chloride (HCl) gas at 430–475°C, producing hydrogen gas (H₂).
- Hydrolysis: Copper chloride (CuCl₂) reacts with superheated steam at 400°C to form copper oxychloride (Cu₂OCl₂) while regenerating HCl gas.
- Oxygen Production: Copper oxychloride is heated to about 500°C using FBTR process heat, releasing oxygen gas (O₂) and producing cuprous chloride (CuCl).
- Electrochemical Cycle: CuCl undergoes low-voltage electrolysis to regenerate copper (Cu) and copper chloride (CuCl₂), completing the closed cycle.
Key Features of the Kalpakkam Facility:
- Powered by FBTR: Uses process heat from the Fast Breeder Test Reactor (FBTR) at Kalpakkam, India’s only operational sodium-cooled fast reactor.
- Lower Temperature Requirement: The Cu–Cl cycle requires a maximum temperature of only 530°C, compared to over 850°C for the Sulfur–Iodine cycle.
- Low Electricity Consumption: The electrolysis stage operates at just 0.5–1.0 volts, significantly lower than conventional water electrolysis (1.23 volts or more).
- Round-the-Clock Operation: Unlike solar- or wind-based hydrogen production, the nuclear-powered system provides continuous, weather-independent hydrogen production.
Key Applications:
- Decarbonizing Heavy Industries: Clean hydrogen can replace fossil-fuel-based gray hydrogen in steel, oil refining, and chemical industries, reducing carbon emissions.
- Green Fertilizer Production: Provides carbon-free hydrogen for producing green ammonia, strengthening India’s fertilizer production and food security.
- Clean Transport and Energy Storage: Supplies hydrogen for fuel-cell vehicles, shipping, aviation, and large-scale renewable energy storage.
