AREVA requested Euronext Paris SA to suspend the listing of the company's stock.
From 4-Traders.com, what looks like AREVA's press release (12/12/2011):
Following press rumors dated Sunday, December 11, 2011 and Monday, December 12, 2011 and public statements dated Sunday, December 11, 2011 concerning the AREVA group and in light of the Supervisory Board meeting to be held today, the group has requested that EuronextParis SA suspends the listing of its stock (code ISIN: FR0011027143).
This initiative is to ensure that comprehensive, accurate and precise information is communicated to the market and to all AREVA's shareholders in an equal manner.
AFP Japanese says the company is set to report a massive loss and the plan to restructure today (December 12).
Even TEPCO is not using AREVA's water treatment system any more. AREVA's system is reportedly the most effective of the three systems (other two being Kurion's and Toshiba's zeolite towers) in removing radioactive materials (mostly cesium), but is prone to more troubles, it is alleged. I personally think TEPCO simply does not want to deal with the radioactive sludge coming out of AREVA's system, and the storage capacity for the sludge was running out when TEPCO stopped using the system.