Corporate Information

Press Release (Dec 06,2007)
Status of the unit 7 turbine internal inspections at Kashiwazaki-Kariwa Nuclear Power Station
As for the unit 7, we have been conducting internal inspections of 
the low-pressure turbine (B) since Dec. 1st by opening its cover.

As a result of the inspection, we found wears (maximum about 2mm) at 
the edges of the rotor blades (shrouds of the 10th and 12th stage), 
at around 2:05pm on Dec.4th. We suppose that they were caused by 
contact of the rotor blades and the stator blades. We also found a 
wear (maximum about 1mm), which was also supposed to be made by 
contact, at the base of the stator blade. 

We will consider repairing the contact points of the rotor blades and 
stator blades. In addition, we will also inspect rotor blades and 
stator blades of the low-pressure turbine (C).

The contact points were found at the same points of the low-pressure 
turbine (A), which we have already inspected.  The size and depth of 
wear is quite similar to each other.
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