当燃料棒温度上升时，它们表面的锆会破裂开来，在内部释放出气态的放射性碘，也许甚至会导致铀熔化并释放出更多的放射性物质。
As the rods heat up, their zirconium cladding can rupture, which releases gaseous radioactive iodine inside, and may even cause the uranium to melt and release much more radioactive material.
至少，核燃料池失去冷却水，而反应堆却破裂并可能漏水。
At least one has apparently lost its cooling water and another is cracked and possibly losing water.
其中一个用于在发射时保持燃料箱压力的阀门，在11月的发射前破裂。
One of these valves - which maintain tank pressure during liftoff - broke during the last shuttle launch in November.
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