Data breach at Kudankulam nuclear plant, blueprints of facility leaked on dark web

Highly sensitive files of Kudankulam Nuclear Power Project (KKNPP) reportedly accessed by a ransomware group from a contractor’s server has triggered “absolute commotion”, sources in the KKNP said on Wednesday (July 15, 2026).

After commissioning two 1,000 Mwe VVER reactors, the KKNPP is constructing four more similar units with Russian technical know-how at Kudankulam, which is all set to house India’s biggest nuclear park with reactors generating 6,000 MW nuclear power.

According to a Reuters report, over 19,000 highly sensitive files dating between 2016 and mid-2025 and linked to KKNPP’s engineering blueprints on control, cooling and ventilation systems, list of vendors and suppliers supplying equipments, operational files on meeting records, reviews of joint inspection by the Indian and Russian engineers, insurance policies etc. had been accessed by well-known ransomware group, World Leaks.