Nach Angeben von TEPCO (
http://www.tepco.co.jp/en/press/corp-com/release/11031308-e.html) wurde das Venting von Block 3 abgeschlossen:
" Unit 3: High Pressure Coolant Injection System automatically stopped. We
endeavored to restart the Reactor Core Isolation Cooling System but failed.
Also, we could not confirm the water inflow of Emergency Core Cooling
System. As such, we decided at 5.10AM, Mar 12, and we reported and/or
noticed the government agencies concerned to apply the clause 1 of the
Article 15 of the Radiation Disaster Measure at 5:58AM, Mar 13.
In order to fully secure safety,
we operated the vent valve to reduce the
pressure of the reactor containment vessels (partial release of air
containing radioactive materials) and completed the procedure at 8:41AM,
Mar 13 (successfully completed at 09:20AM, Mar 13). After that, we began
injecting water containing boric acid that absorbs neutron into the reactor
by the fire pump from 09:25AM, Mar 13.
* We continue endeavoring to secure the safety that all we can do and
monitoring the periphery."
Was genau wohin entlastet und injeziert wurde, sagen sie nicht. Fire Pump klingt für mich nach Löschwasserpumpe .... ... mit der man das Meerwasser in den Sicherheitsbehäter um das Reaktordruckgefäß pumpt.