The plant looks less steamy today, although it continues to glow
Fukushima Diary reported May 15 that radiation levels were rising in units 1 and 3:
Reactor1 reaching 49℃, increased by 3℃ within 24 hours
Radiation level in leakage detector hole water of reservoir No.3 jumped up 5 times much
Yesterday, webcam watchers posted observations at Enenews of an unusual human activity at unit 3. It is highly unusual to see any human activity anywhere near unit 3.
Perhaps some heroic individual(s) executed some brave acts to halt whatever was producing the recent, massive, steam releases.