Entergy is preparing for a 13 percent power uprate that will make Grand Gulf the most powerful single-reactor nuclear plant in the country.In the process, the $724 million project in Port Gibson, Miss., is expected to create 4,000 jobs. The Shaw Group will conduct the work, and the Natchez Democrat reported that prospective vendors can inquire about opportunities by calling 855-690-7429 or at www.shawgrp.com/suppliers. Nuclear workers can direct questions about jobs to email@example.com or 866-760-7429.The Democrat this weekend quoted an Entergy spokeswoman as saying work is expected to begin in the first quarter of 2012. The Nuclear Regulatory Commission anticipates approval for the uprate in March, according to the agency's website.Entergy and the South Mississippi Electric Power Association, which holds a 10 percent stake, own the plant first licensed in 1984. It uses a single GE-6 boiling water reactor with Mark III containment that currently produces 1,297 megawatts.