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Got a mail from WANO relayed to me, below is the interesting part about the explosion. ----- 1. Hydrogen explosion occurred at 15:36 between containment and r
by jensnockert 16y ago
Got a mail from WANO relayed to me, below is the interesting part about the explosion.
-----
1. Hydrogen explosion occurred at 15:36 between containment and reactor building of Fukushima Daiichi unit 1. Walls of reactor building were blown out or damaged.
2. It was confirmed that unit 1 containment integrity was maintained.
Explosion was not inside the containment as it is inert.
3. Radiation level at the Fukushima Daiichi site border once increased when containment vent was conducted and reached 1,015 micro Sv per hour around the time when explosion occurred; however, the radiation level turned to decrease after the explosion down to 860 at 15:40 and 70.5 micro Sv per hour at 18:58.
4. Government has agreed to TEPCO decision to fill the entire containment up with sea water. The filling sea water will contain boron. TEPCO started the work for filling up at 20:20.
- jensnockert 16y agoWNN (http://www.world-nuclear-news.org/RS_Battle_to_stabilise_earthquake_reactors_1203111.html http://www.world-nuclear-news.org/RS_Battle_to_stabilise_ear...) was updated with news that the sea water injection has started.
- sophacles 16y agoWhat is the significance of boron in the seawater? (It just reads like one of those understated but extremely important bits you find in these sorts of alerts :-| )
- jensnockert 16y agoBoron has a high neutron cross-section, it therefore absorbs neutrons and slows down the fission process. In a PWR you add it into the water as a way to moderate the reaction, but in a BWR (like the reactor 1 in Fukushima Daiichi) you only add it as a last resort, since it is incredibly hard to clean out of the system.
- ElliotH 16y agoBoron absorbs neutrons. This stops nuclear reactions in progress.
- jensnockert 16y agohttp://www.world-nuclear-news.org/RS_Battle_to_stabilise_earthquake_reactors_1203111.html http://www.world-nuclear-news.org/RS_Battle_to_stabilise_ear... was updated again, with news that the sea water injection was paused due to a new tsunami warning and that the event is now classified as a level 4 event on the INES (http://en.wikipedia.org/wiki/International_Nuclear_Event_Scale http://en.wikipedia.org/wiki/International_Nuclear_Event_Sca...) scale, TMI was classified as 5 and Chernobyl 7.