This could get ugly in a hurry.  Oyster Creek is the same design, but even older than Fukushima, and acccording to Reuters, just 6 more inches of water will completely submerge the cooling pump.

Nation's oldest nuclear plant on alert

(Reuters) - Exelon Corp declared an "alert" at its New Jersey Oyster Creek nuclear power plant due to a record storm surge, the Nuclear Regulatory Commission said, warning that a further water rise could force the country's oldest working plant to use emergency water supplies to cool spent uranium fuel rods.

The alert came after water levels at the plant rose by more than 6.5 feet, potentially affecting the pumps that circulate water through the plant, an NRC spokesman said late on Monday.  A further rise to 7 feet could submerge the service water pump motor that is used to cool the water in the spent fuel pool.

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