Section 6(2)(a) in The Manufacture, Storage And Import Of Hazardous Chemicals Rules, 1989
(a)"new industrial activity" means an industrial activity which-(i)commences after the date of coming into operation of these rules; or(ii)if commenced before that date, is an industrial activity in which a modification has been made which is likely to cover major accident hazards, and that activity shall be deemed to have commenced on the date on which the modification was made;