Sunday, March 20, 2011 Japan Nuclear Agency: Pressure Inside No. 3 Reactor Containment Vessel Rising TOKYO (Dow Jones)--Japan's nuclear safety agency said Sunday that pressure levels are rising inside the containment vessel at reactor No. 3 at the stricken Fukushima Daiichi nuclear power plant. The Nuclear and Industrial Safety Agency said at a press conference that plant operator Tokyo Electric Power Co. (9501) will open valves at the reactor in a bid to reduce pressure levels, an operation that it said could result in the release of radioactive steam. If a mechanism at the reactor know as the suppression chamber---which...