Susan Rapp, 17, a junior at Edison High School in Alexandria, was the fifth-fastest qualifier today in the 200-meter breaststroke in the U.S. world championship swim trials.

Rapp's time was 2 minutes 36.15 seconds, 3 1/2 seconds behind Jeanne Childs. Rapp competes for Starlit Aquatics and is the first team member with a chance to make the U.S. contingent that will go to the World Games in Ecuador, July 29 to Aug. 7.

Starlit members Andy Wren and Keith Clinton qualified for the consolation finals in the 100-meter butterfly. Wren, a junior at Virginia, qualified 13th in 55.72 and Clinton, who attends Alabama, was 17th in 56.37.

Other Starlit swimmers competing today were Stephanie Elkins, a sophomore at Stanford who was 24th in the 200-meter freestyle in 2:05.51, and Heather Strang, of East Lansing, Mich., who was 43rd in the event (2:10.23) after posting a second-place finish in the 100-meter freestyle consolation final Monday night. Barb Major, another Stanford swimmer who competes for Starlit, was fourth in the same final.

Jenny Rapp, who also attends Stanford, placed fifth in the consolation final in the 400-meter individual medley Monday night.