NBC plans to unveil most of its new primetime shows during the week of Sept. 17, it said Wednesday. Emeril, the new sitcom starring TV chef Emeril Lagasse debuts on Tuesday night, Sept. 18, followed by new episodes of Three Sisters and Frasier. The reality series Lost is set to debut at 8 p.m. on Wednesday, Sept. 18, followed by new episodes of The West Wing and Law & Order. Must-See TV will return on Thursday, Sept. 20, with the new series Inside Schwartz landing the 8:30 p.m. period between Friends and Will & Grace. The network’s Friday-night shows will return unchanged on Sept. 21. On Sunday, Sept. 23, the network will premiere Law & Order: Criminal Intent and UC: Undercover.