This an extract fom the latest update:
"TEPCO has reported that information obtained after calibration of the reactor water level gauges of Unit 1 shows that the actual water level in the Unit 1
reactor pressure vessel was lower than was indicated, showing that the
fuel was completely uncovered. The results of provisional analysis show
that fuel pellets melted and fell to the bottom of reactor pressure
vessel at a relatively early stage in the accident.
TEPCO reported that "most part of the fuel is considered to be
submerged in the bottom of reactor pressure vessel and some part
exposed." TEPCO also reported that leakage of cooling water from the
reactor pressure vessel is likely to have occurred. However, TEPCO
considers that the actual damage to the reactor pressure vessel is
limited, on the basis of the temperatures now being measured around the
reactor pressure vessel."
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