A report on the Japanese crisis this week by Barclays Capital said, “Never, never, never allow the water level in a nuclear reactor to fall below the level of the fuel. This is the mantra pounded into the minds of nuclear power plant operators all over the world.” The report added, “It is hard to overemphasize the importance of the ‘keep the fuel covered’ training and design of these plants.” One of the report’s authors formerly provided such training at a U.S. commercial nuclear plant.