Urgent: Speculation

-Presence of a visible shock wave traveling upwards over the reactor containment building is troubling.

-The building must have been destroyed either by a hydrogen burn in the containment or else a steam explosion in the primary

-The SL-1 Accident at NRTS Idaho and the Chernobyl Accident both included core steam explosions and physical core derangement

-The TMI-2 Accident included a hydrogen burn in the containment with no serious damage

-US Nuclear plants have hydrogen combustion equipment fitted in the containments to prevent explosive hydrogen burn and hydrogen detection equipment; however, if turned off a long time this should not be turned on

-Any spark in the containment, such as starting or energizing any remote equipment could trigger a hydrogen burn if the partial pressure of H2 is above the explosive threshold (more on that later today)

There is a 50% chance this now a nuclear accident.

6:30 AM Saturday....Situation developing