Two Soviet teams were to arrive Tuesday in Britain for the first inspections in that country under the treaty banning superpower medium-range missiles, a U.S. spokesman announced Monday.

The Soviets were to arrive at Greenham Common at 1 p.m. GMT (7 a.m. MDT) and inspect two sites there on Wednesday, said Lt. Col. Joseph Wagovich, a spokesman for the On-Site Inspection Agency.Seven U.S. teams are in the Soviet Union conducting what are called "base-line inspections" to determine the accuracy of information exchanged under the Intermediate-Range Nuclear Force Treaty signed at the Washington summit last December by President Reagan and Soviet leader Mikhail Gorbachev.

"Everything seems to be going very well," said Wagovich.