The Houston Astros committed the Astrodome for the 1992 Republican Convention without approval of the National League and intend to leave the stadium for one month, baseball officials said.

Astros chairman John McMullen said the Astros are considering playing part of their 1992 home schedule at the Superdome in New Orleans.The Major League Baseball Players Association said in New York that it would not permit either a lengthy road trip or having the Astros play home games in another city.

Locally . . .