Robert Bazell, NBC News

Robert Bazell, NBC News' senior science correspondent, just returned from several weeks of reporting in Tokyo, Japan on the radiation crisis. 

Nearly three weeks after a March 11 earthquake and tsunami slammed and engulfed the Fukushima Dai-ichi plant, knocking out cooling systems that keep nuclear fuel rods from overheating, Tokyo Electric Power Co. is still struggling to bring the facility in northeastern Japan under control.

Bazell responded to readers' questions about fears of further radiation leaks.

Click the box below to replay the chat.

See more of Bazell's reporting on NBC's Nightly News with Brian Williams, MSNBC and msnbc.com. Click here for more news on Japan.

Live chat with NBC's Robert Bazell about Japan radiation

Video: Nuclear crisis worsens in Japan

  1. Closed captioning of: Nuclear crisis worsens in Japan

    >> you. in the news, radiation is at its highest level yet in the sea water surrounding the quake-ravaged nuclear facility in japan. lee cowan has more from tokyo. lee, good morning.

    >> reporter: good morning. yeah, the levels were more than 3,000 times the normal level but experts say it is still not a threat to human safety. it's the highest level read so far since the crisis started and engineers still don't know where the leak is coming from. new aerial pictures of the stricken plant are offering some of the best glimpses yet of the extent of the damage. through a hole blasted in the roof by a hydrogen explosion, experts say they can now tell that some crucial pipes are missing. experts believe it is damaged plumbing that's likely the source of leaking radioactive water, a development that kept workers from making any real progress in getting the crisis under control. officials said today that radiation in nearby seawater had nearly doubled and they are worried that more contaminated water may seep into the ocean if they can't find the source of the leak. so stressful is the situation it was announced the president of the utility who owns the plant was taken to the hospital suffering hypertension and dizziness. the scope of the disaster is staggering. 30,000 people are either dead or missing. there is little that can be salvaged. but as this man put it, we can't dwell in the past, otherwise we'll never move forward. moving forward is what this elementary school is trying to do by holding its graduation. a piano pulled from the rubble offered some of the first music they had heard in weeks as the tsunami's youngest survivors look to a future uncertain at best. back to the numbers for a bit. it's estimated now that the disaster will cost well over $300 billion. that's a conservative estimate. if that's the case it would be the costliest national disaster on record.

    >> lee, thank you.

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