Madras Atomic Power Station, Sadras, Tamil Nadu India

 Madras Atomic Power Station located at Kalpakkam about 80 kilometres (50 mt) south of Chennai, India, is a comprehensive nuclear power production, fuel reprocessing, and waste treatment facility that includes plutonium fuel fabrication for fast breeder reactors (FBRs). It is also India's first fully indigenously constructed nuclear power station. It has two units of 220 MWe capacity each. The first and second units of the station went critical in 1983 and 1985 respectively. The station has reactors housed in a reactor building with double shell containment ensuring total protection even in the remotest possibility of loss of coolant accident. An Interim Storage Facility [ISF] is also located in Kalpakkam.

Madras Atomic Power Station was built to strengthen the nuclear capability of India, and it laid the foundation for the indigenisation of India's nuclear power programme. The plant was constructed during the Prime Ministership of Indira Gandhi. The MAPS-1 reached criticality on 2 July 1983 and it was synchronised to the grid on 23 July 1983 in the presence of Prime Minister Indira Gandhi. During its construction, a total of 3.8 lakh (380,000) railway sleeper (logs) were brought from all over India to lift the 180-tonne critical equipment in the first unit, due to lack of proper infrastructure and handling equipment.