“AERB has issued a permit for groundworks to begin on the site of Unit 3 and 4,” NDTV quotes Sundar as saying. On 21 January, Unit 1 was re-started with the assistance of Russian engineers – the controlled chain reaction is again sustained in the reactor. The first preventive maintenance of the unit was completed last year, followed by the loading of fresh fuel in December 2015. The both tasks involved Russian technical expertise.