Open this photo in gallery:The filing allows Westinghouse to prepare for a public listing and share information privately with regulators.Keith Srakocic/The Associated PressSave for laterNuclear reactor vendor Westinghouse Electric Co. has confidentially filed for a U.S. initial public offering, its owners revealed on Friday, as demand for new sources of nuclear power attracts renewed interest from investors.Westinghouse is jointly owned by Brookfield Asset Management Ltd. BEP-UN-T, through its renewable energy arm, and Saskatoon-based uranium fuel provider Cameco Corp. CCO-TThe number of shares to be offered and the price range for the public listing have not yet been set, and the…