Groton — The Navy awarded a $94 million contract to Electric Boat to repair the USS Miami, severely damaged in a fire last May.

The planning contract will allow EB, teamed with Huntington Ingalls Industries, to support the engineering that will guide the repairs and purchase parts such as piping and electrical cabling for the Groton-based submarine. It includes an option worth an additional $6 million.

"This work is not a normal repair job, but rather a drastic overhaul of the burnt-out innards of this critical vessel," U.S. Rep. Joe Courtney, D-2nd District, said in a statement. "As the builder of the Miami, the talented men and women of Electric Boat are uniquely suited to take on this challenge."

The repair contract, which is also expected to go to EB, will be awarded in the spring. The Navy has said it expects the repairs will be done in April 2015 for about $450 million. The Miami (SSN 755) was in a dry dock at the Portsmouth Naval Shipyard for maintenance and upgrades when it caught fire May 23 and burned until the next day. The shipyard worker accused of setting the submarine on fire has been charged with arson.