Rockville, Md., Municipal Swim Club's Clay Britt, 17, and Melissa Belote of Springfield. Va., reached the finals in the 100-meter backstroke events yesterday during the last day of competition at the AAU National Swimming Championships.

Britt was seeded fifth in the championship final, recording a 58.36. The top seed was Olympic silver medalist Peter Rocca who touched in 57.96.

Belote, swimming for DeAnza Swim Club of Cupertino. Calif., qualified seventh with a 1:05.6. Qualifying first was American record-holder Linda Jezek, who will be going after her 10th consecutive national backstroke title.

During Saturday's finals Belote finished sixth in the 200-meter backstroke in 2:19.57. She needed to finish in the top two to qualify for the World Championship team to compete Aug. 18.28 in West Berlin.

The 21-year-old senior at Arizona State University didn't have her usual strong finish over the last 50 meters as she made the final turn tied for second.

"I hit the lane line on the third 50 and I just couldn't get going," Belote said after the race.

Also during Saturday's finals, Starlit Aquatic Club's Betsy and Jenny Rapp finished in the top eight in the 200-meter butterfly.World Championship-bound Betsy. 18, finished fifth in 2:14.56 while Jenny. 14, placed seventh touching at 2:15.78.

After four days of competition Starlit's women were in eighth place with 92 points. Nashville Aquatic Club was winning the women's competition with 379 points while Florida Aquatics led the men's scoring race with 446 points.