The two control rods at the unit 6 that could not be pulled out
(announced on Nov. 25th) were successfully pulled out by 3pm today
through the procedure ruled when facing this event. The procedure
is to re-conduct normal pulling-out operation after normal pulling-
out operation and full insertion of control rods with the same
water pressure of scram.
Removal of the fuel assemblies and pulling-out operation of control
rods except the two have been finished in the morning of Nov. 26th.
We will investigate the cause of the event.
A similar event happened at the unit 7 and was solved through the
same procedure. After conducting the investigation, we suppose that
it was a transmit event caused by increase of friction resistance in
the control rod drive mechanism (announced on Nov. 22nd).
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