SHULTZ PROMISES A 'REASONABLE' U.S. AT ARMS MEETINGS
Secretary of State George P. Shultz said today that he was carrying ''some very interesting and reasonable positions'' to present to Foreign Minister Andrei A. Gromyko when Soviet-United States arms control talks resume here on Monday. He did not specify, in a news conference aboard his plane on his way here, what those ''positions'' were. But some American officials said Mr. Shultz was given additional flexibility by President Reagan two days ago in discussing possible restraints on development of an antisatellite weapons system, something that Moscow seeks to halt. In his arrival statement this morning, Mr. Shultz said he had been sent here on ''a mission for peace,'' but he was deliberately cautious about predicting the outcome of the first important Soviet-American arms control exchange in 13 months.