Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
Display:
I found the English press releases of NISA (Nuclear and Industrial Safety Agency). They bring quite detailed information. In the latest release, there is the
  • status report, which is more detailed than TEPCO's
  • overview per plant, with graphics, current water level, pressure etc. readings, and the detailed history for each plants
  • major parameters table, which brings some data we haven't seen before. For example, the radiation level in the dry well of the reactors: it ranges from 28.6 Sv/h (No. 3; on 24 March, it was 57.9 Sv/h!) to 40.5 Sv/h (No. 2).

The previous release also included
* radiation levels at several measuring points around the Daiichi and Daini plants, with map. There is one location with readings persistently around 1,250 μSv/h.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Wed Mar 30th, 2011 at 02:00:10 PM EST
The Major Plant Parameters Table of the Status Report indicated that 1.5m to 2.25m of rods are exposed in each of reactors 1-3 and that the containment vessel of reactors 2 and 3 are at or near atmospheric pressure. This would be consistent with loss of containment vessel pressure. Unit 1 still has about 5 atmospheres of pressure while the readings for units 2 and 3 are confusing, as three of four readings show fractional atmospheric pressures, (with 100kPA being ~ 1 atmosphere.) Only reactor pressure vessel 1 has significant pressure above atmospheric or a reactor temperature close to design limit.

The supression pool in the torus appears to be intact on units 1 and 3 but there is no data on unit 2 where there were earlier reports of an explosion in the supression pool. The 46C reading for the temperature of the spent fuel pool in Unit 2 is consistent with other, earlier readings which are likely IR readings taken from helicopters or UAVs. The report only shows "indicator failure" for Units 1 & 3.

"It is not necessary to have hope in order to persevere."

by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Wed Mar 30th, 2011 at 04:57:58 PM EST
[ Parent ]
Helicopter readings were taken of the pools uncovered by hydrogen explosions, which also knocked out the installed measuring equipment.

Seeing the water levels, if there is no mistake in it, then meltdown can very well go on at the top of the rods...

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Wed Mar 30th, 2011 at 07:00:49 PM EST
[ Parent ]
Perhaps it is leak issues that prevents them from keeping the water at least over the top of the rods? Surely they cannot believe that leaving a meter or two exposed is acceptable.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Wed Mar 30th, 2011 at 10:54:18 PM EST
[ Parent ]

Display:

Occasional Series