Madras Atomic Power Station (MAPS) (Tamil:சென்னை அணுமின் நிலையம்) located at Kalpakkam about 80 kilometres (50 mi) 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.Currently the Prototype Fast Breeder Reactor (PF