[ RadSafe ] report about Japan crisis.

[Franta, Jaroslav]

UNRESTRICTED | ILLIMITÉ

Jeff et-al,

I suspect that the anomalously high readings near U3 & U4 buildings (see below) could be due to top of fuel being above water level -- therefore no water shielding, normally some 8m deep.....
http://www.nei.org/filefolder/BoilingWaterReactorDesign_3.jpg

As soon as re-flooding submerges the core, it should go back down to much lower levels.
Also, site boundary reading suggests that this is the case, rather than contamination....
Hoping for confirmation soon !

Thnx

Jaro
^^^^^^^^^^^^^^^^^^^^



-----Original Message-----

http://www.nei.org/newsandevents/information-on-the-japanese-earthquake-and-reactors-in-that-region/ 

UPDATE AS OF 9:15 A.M. EDT, TUESDAY, MARCH 15:
Fukushima Daiichi
Units 1 and 3 at Fukushima Daiichi are stable and cooling is being maintained through seawater injection. Primary containment integrity has been maintained on both reactors.

The Japan Atomic Energy Agency (JAEA)reported an explosion in the suppression pool at Fukushima Daiichi Unit 2, at 7:14 p.m. EDT on March 14. Reactor water level was reported to be at 2.7 meters below the top of the fuel. The pressure in the suppression pool decreased from 3 atmospheres to 1 atmosphere. Radiation readings at the site increased to 96 millirem per hour. 

Dose rates at Fukushima Daiichi as reported at 10:22 p.m. EDT on March 14 were:

Near Unit 3 reactor building 40 rem/hr
Near Unit 4 reactor building 10 rem/hr
At site boundary 821 millirem/hr.
Kitaibaraki (200 km south of site) 0.4 millirem/hr.

We are working on getting updated information on radiation and dose rates at and near the plant. 

Station personnel not directly supporting reactor recovery efforts have been evacuated, leaving approximately 50 staff members at the site. Operators are no longer in the main control room due to high radiation levels.

Safety relief valves were able to be re-opened and seawater injection into the reactor core was restarted around 1 a.m. EDT on March 15 and is continuing. 

At Unit 4 on March 14 at approximately 8:38 p.m. EDT, a fire was reported in the reactor building. It is believed to have been from a lube oil leak in a system that drives recirculation water pumps. Fire fighting efforts extinguished the fire. The roof of the reactor building was damaged.

Fukushima Daini
All four reactors at Fukushima Daini are being maintained with normal cooling using residual heat removal systems.


Jeff Terry
Asst. Professor of Physics
Life Science Bldg Rm 166
Illinois Institute of Technology
3101 S. Dearborn St. 
Chicago IL 60616
630-252-9708
terryj at iit.edu


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