This episode's headline: News Summary; Nuclear Meltdown?. The guests include In Moscow: DONALD KIMELMAN, Philadelphia Inquirer; In Bonn, West Germany: THOMAS ROSER, German Atomic Forum; In Boston: RICHARD WILSON, Harvard University; MARSHALL GOLDMAN, Harvard University; In Washington: HENRY WAGNER, Johns Hopkins; JAMES MacKENZIE, Union of Concerned Scientists; CARL WALSKE, Atomic Industrial Forum; Reports from NewsHour Correspondents: BRIAN HANRAHAN (BBC), in Moscow. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor