one reactor at that plant could be leaking. from the cnn center in atlanta, georgia, this is your cnn start morning. hello to you all. glad you could spent some part of your saturday morning with us. i m t.j. holmes. i do want to start now, though, in japan with the growing concern over radiation levels in the ocean water around that damaged nuclear plant. radiation levels in the air at least seem to be decreasing. paula hancock s live for us in tokyo. hello to up. what are they saying about this possible leak of one of those reaccour reactor cores. that s a key concern right now. reporter: absolutely. well, t.j., this was said friday evening local time when they were concerned there could have been a break or rupture within the reactor core as well and this is why the water was 10,000 times the radioactive level than it should have been. but now they re saying maybe it wasn t actually a break in the reactor core. quite frankly, they don t know what is causing this leak at