At around 11:07 AM on September 22, during debris removal
from the upper part of Unit 3 Reactor Building, a steel
beam (approx. 300mmx200mmx7m, approx. 470kg) which had been
on the side of the spent fuel pool (SFP) and found to be
unstable slipped and fell into the pool when a worker was
trying to grab it using an oil-pressure fork attached to
the head of a crane.
In response to this incident, we received a directive
document*1 "A steel beam falling into Unit 3 spent
fuel pool at Fukushima Daiichi Nuclear Power Station
(Direction)" from the Nuclear Regulatory Authority on
September 26. (Previously announced on September 26,
2012)
Based on the direction given, we evaluated the impact of
this incident on the soundness of the spent fuel, the spent
fuel storage rack and the spent fuel pool while
investigating the cause of this matter and discussing
recurrence prevention measures. On October 3, a report was
submitted to the Nuclear Regulatory Authority. (Previously
announced on October 3, 2012)
Yesterday, we have received another directive document*2
"A steel beam falling into Unit 3 spent fuel pool at
Fukushima Daiichi Nuclear Power Station (Additional
Direction)" from the Nuclear Regulatory Authority. In
accordance with the direction given, we will promptly
implement necessary measures and report the results.
End
*1 Directive document
"A steel beam falling into Unit 3 spent fuel pool at
Fukushima Daiichi Nuclear Power Station
(Direction)"
*2 Directive document
"A steel beam falling into Unit 3 spent fuel pool at
Fukushima Daiichi Nuclear Power Station (Additional
Direction)"
The aforementioned documents are available only in
Japanese. We apologize for the inconvenience this may
cause.
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