2. In section 2 of the Atomic Energy Act, 1962 (hereinafter referred to as the principal Act), in sub-section (1), for clause (bb), the following clause shall be substituted, namely:- '
(bb) "Government company" means a company in which-
(i) not less than fifty-one per cent. of the paid-up share capital is held by the Central Government; or
(ii) the whole of the paid-up share capital is held by one or more of the companies specified in sub-clause (i) and which, by its articles of association, empowers the Central Government to constitute and reconstitute its Board of Directors;'.