LONDON—A team of 40 scientists from the United States, Western Europe, Japan and the Soviet Union plans to begin work next spring on a three-year, $180 million effort to design the next large thermonuclear fusion experiment. If the participants accept the design, construction of the International Thermonuclear Experimental Reactor (ITER) could begin as early as 1993. Meeting last month in Vienna, officials from each of the participants also agreed on a European site for the project. It

LONDON—One of the starkest contrasts between the accidents at Three Mile Island and Chernobyl is in the type of scientific research that each has stimulated. After Three Mile Island, reactor operators and regulators throughout the West reassessed the technology and the policies behind nuclear safety. Research in the wake of Chernobyl has focused instead on the environmental effect of the radionuclides released from the reactor. Within a day after news of the accident, for example, the chai