Asahi Shimbun article has detals of venting and heat decay -

http://www.asahi.com/english/TKY201103250388.html

Just a random sample of two parts, it's a good bit longer:

"According to NISA officials, the No. 1 reactor was ventilated once on March 12, while the No. 2 reactor was ventilated on March 13. The No. 3 reactor was ventilated three times, on March 12, 13 and 14.

However, those ventilations were conducted in a way to reduce the effects on the environment.

The steam was first sent to the suppression pool under the pressure container and made to pass under water in the pool before being released."

snip

According to calculations by Koide, decay heat has decreased to minimal amounts compared to when the reactor was actually operating, but the fuel rods still have about 6,000 kilowatts of energy in the No. 2 and No. 3 reactors. The energy will only gradually reduce to about 3,000 kilowatts after six months and to 2,000 kilowatts after one year.

Each assembly holds around "about"64 fuel rods, so at the moment each fuel rod is generating 1600 watts of decay heat. After 7 years that number will fall to around 1.5 KW per fuel assembly. At which time they may be moved to dry casks storage, and no longer need water for cooling or shielding.

This guy obviously doesn't understand basic physics.

:sarcasm: