our continuing coverage. japan is working to stop more radiation flowing out of the nuclear power plants. the biggest concern right now a plant in fukushima where cruise are flooding the reactors with cooling seawater. tensions ease slightly of reports that radiation levels at another power plant are normal. let's go straight now to tokyo and stan grant. he's monitoring the fast-moving developments for us. stan. >> reporter: yeah, don. as i said, most of the focus has been around the daiichi plant, reactors 1 and 2. what they're doing is assuming worst, and that is that there is a potential for a meltdown or a likely meltdown of reactor 1 and a possibility or possible meltdown in reactor number 3. that's the assumption.