From Kyodo News: The containment vessel for No. 3 reactor may be damaged.
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In that accident, the lack of a containment vessel surrounding the reactor meant radioactive materials from the accident were spread far and wide.
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Both the drywell and the wetwell are surrounded by a secondary containment vessel (or shield building) also built from reinforced concrete about a meter thick.
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The containment vessel for the reactors is only 65 feet long.
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The containment vessel is 60-feet high and 16-feet wide.
FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris
Made of hardened steel that is between four and eight inches thick, the integrity of the containment vessel is critical in preventing enormous quantities of radioactive material from escaping into the environment.
FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris
In late March, Tepco said readings of airborne radiation inside the containment vessel at the No. 2 reactor had surged to a deadly 79 sieverts, the highest level since the crisis began March 11 last year.
The bright yellow dome of the steel containment vessel at Unit 4, Fukushima Daiishi nuclear power plant (FDI) is clearly visible amid the pulverized remains of the building in a new video released by the Tokyo Electric Power Company.
FORBES: New Video From Fukushima Shows Containment Vessel Dome Amid Debris
In 2002, Tepco admitted to the Nuclear and Industrial Safety Agency that it had falsified the results of safety tests on the containment vessel of the No. 1 reactor, which is now one of three reactors that workers are struggling to keep from overheating.
That is a very different situation than at Fukushima Daiichi, where the fuel in three reactors is thought to have burned holes in their immediately surrounding pressure vessels, and in one case to have fallen all the way through to the bottom of the outer containment vessel.
WSJ: Japan to Take 40 Years to Dismantle Fukushima Nuclear Plant
Tuesday's explosion at the No. 2 reactor in the Fukushima complex, 150 miles north of Tokyo, for the first time raised the possibility that the key containment structure of the unit, which protects the reactor vessel and keeps dangerous radioactive materials from leaking out, had been damaged.
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