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Some recnt info:

http://physicsforums.com/showthread.php?t=480200&page=768

“http://www3.nhk.or.jp/news/genpatsu-...207/index.html The core spray system flow rate was increased by 3 tons/hour at around 4 AM on 7 February. Total flow rate: 13.5 tons/hour. Tepco is surveying with deep care the effects of the flow rate increase over the next 24 hours or so.

http://www.nikkei.com/news/headline/...E0E2E2E2E2E2E2 :
7 February 08:00 : 71.4°C
7 February 10:00 : 69°C

http://www.nikkei.com/news/headline/...E09180EAE2E2E2 :
7 February 13:00 : 71.5°C
No xenon was detected on 7 February.

http://sankei.jp.msn.com/science/new...4230004-n1.htm
7 February 17:00 : 68.5°C (and the other two thermometers have dropped to around 41°C)

http://www.tokyo-np.co.jp/article/na...702000039.html The core spray system had been interrupted for 6 hours on 26 January in order to change a pump. Tepco says the way the water is flowing might have changed at that time, no longer reaching the areas close to the fuel as well as before. Institute of Applied Energy department head Masanori Naito said some fuel might have fallen into the RPV bottom and formed a small heap.”