Fuel rods inside the reactor are nearly half exposed after a loss of cooling water, creating a dangerous buildup of oxygen and hydrogen and fears of another explosion.
The company says that after injecting 413 cubic meters of nitrogen gas until 5 PM on Thursday, the pressure reading inside the vessel was 1.76, up 0.2 from before the injection started. The company says it will continue the work for 6 more days and study a similar operation in the Number 2 and 3 reactors.
Tokyo Electric also admitted that the level of highly radioactive water in a concrete tunnel of the Number 2 reactor rose 5 centimeters in the 24 hours until 7 AM local time on Thursday.It says the rise may be a result of work on Wednesday to stop highly radioactive water leaking into the sea from a cracked concrete pit. The company says the water is about a meter below the ground level, and that it will keep monitoring it to prevent an overflow.
http://www3.nhk.or.jp/daily/english/07_37.html Admitted? This is good news. If you plug a leak but water levels don't rise behind the leak... it just means that the water is getting out somewhere else.
As for the pressure rising... this is quite obviously a lie. The rector vessel can't hold pressure when the core has resumed criticality and melted through the bottom. Who do they think they're fooling? :sarcasm: