Iran and Iraq agreed to receive a U.N. peace mission headed by former of Abadan.

Iran claimed yesterday to be staging successful counterattacks near Abadan, pushing the Iraqi invaders back from the eastern side of the city, Iraq claimed that 117 Iranian troops were killed in that sector at the southern end of the 300-mile front.

In neighboring Kuwait, meanwhile, a government spokesman said that an unidentified military plane fired two rockets at the Kuwaiti border post with Iraq yesterday but caused no damage or casualties. The Iraqi armed forces high command announced later in Baghdad that it had shot down an Iranian plane inside Kuwaiti territory.

The attack marked the first military action in the seven-week war to hit a neighboring country, although Iran had repeatedly accused Persian Gulf states of helping Iraq and threatened retaliation in the early days of the war.

U.N. Secretary General Kurt Waldheim said he was sending Palme, the leader of Sweden's Social Democratic Labor Party, to Baghdad and Tehran early next week to try to arrange talks to end the war. He said both governments agreed to receive the envoy.

In Stockholm, Palme said the hostage issue would be "outside the mission," which would be an "investigative rather than a negotiating or mediating one."