India India · Kalpakkam · 12.558, 80.175

ZERLINA

ZERLINA, a research reactor (tank) in Kalpakkam, India, with 100 W of thermal power, operated by Indira Gandhi Centre for Atomic Research. Decommissioned, first critical in 1961.

It was one of the 11 research reactors India has had; 5 remain in operation today. It went critical 5 years after the first research reactor in India, Apsara (1956). 36 tank-type reactors remain in operation today across 23 countries.

Country
India
City
Kalpakkam
Type
Tank
Thermal power
100 W
Operator
Indira Gandhi Centre for Atomic Research
Status
Decommissioned
First criticality
1961

Data: IAEA RRDB · updated on Sep 3, 2026

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