Houston Astros owner John J. McMullen tonight reiterated his assertion that he has done all he can to make the Astros a viable franchise, but he again refused to say whether he will move the franchise.

McMullen, who came here from his home in Montclair, N.J., to watch his team play the Phillies, told The Washington Post last Thursday he was unhappy with the team's situation in Houston. Sources said last week that McMullen was considering moving the franchise to Washington, one of a number of cities seeking a major league baseball franchise.

Tonight, McMullen refused to categorically deny that the Astros would move.

"Why should I give you a blood oath?" he said. "What you're asking for is a blood oath, something no one else in the world is asking for. That's unreasonable."

When asked if speculation was unfounded, McMullen said, "It really is."

McMullen has contended that there is a lack of support for the franchise.

"As far as I'm concerned, I've done everything I can to make this a great team for Houston," he said. "The rest is up to the people of Houston. They can have it the team if they want it."

McMullen said he had not spoken with Commissioner Peter Ueberroth about any possible move.