According to plant parameter released by Tepco, hydrogen concentration in PCV of reactor1 is increasing since 5AM of 12/8/2012. At 9:10 of 12/7/2012, Tepco restarted the nitrogen gas injection into suppression chamber of reactor1 but the connection is unknown. [Link]   Source     Iori Mochizuki _____ Français : La concentration en hydrogène du réacteur [...]