Jackie and Tim Martin are comfortably certain not many couples have pledged their undying love for each other on top of a nuclear reactor.

The Martins, married 11 years ago, repeat their wedding vows each year in a different state and plan to do it in all 50. In Utah, they did it on the edge of Bryce Canyon.When it came time for Idaho, they settled on the Experimental Breeder Reactor I at the Idaho National Engineering and Environmental Laboratory, the first power plant to produce electricity by splitting the atom.

"We're celebrating the nuclear family, and we're experimental," said Tim, 47, a document researcher for attorneys in Corona, Calif. Jackie, 49, teaches handicapped high school children.