Operation of ventilation and air-conditioning system at reactor building 
of unit 5 and 6 has been suspended since March 11, 2011. We have been 
carrying restoration works and checks to repair the system to prevent the 
equipment from degradation aiming for keeping the stable cold shutdown and 
improve the high-humidity environment in the building. Now the system is 
ready to operate and so we will start the operation of the system at 13:30 
pm on January 11, 2012.
The operation of the system leads air inside of reactor building to be 
exhausted through main exhaust stack of unit 5 and 6. However, we will 
monitor the exhausted air by radiation monitor (exhaust monitor) that is 
the same as the way we monitor them before March 11, 2011, and also we 
will exhaust the air through newly installed high performance particle 
filter placed at both intake and exhaust sides at air-condition equipment 
in reactor building to reduce the level of radioactive.