Tuesday, 15 March 2011
This is a nuclear disaster
There have also been the first reports of radioactive iodine and caesium traces in drinking water supplies in Fukushima.
Pressure has reportedly dropped in the suppression chamber - suggesting a crack in the containment vessel. If so, highly radioactive materials (in air or possibly in liquid) will be able to leak out.
Radioactivity levels have now risen significantly - numbers are no longer in MICROsieverts but in MILLIsieverts - a thousand times greater. Recommended maximum annual doses are around 10mSv a year - measurements of 400mSv per hour have been reported near the reactors.
As a consequence, temperatures in the spent fuel pools have also risen as cooling has not been in place. A further hydrogen-ignited fire therefore broke out in the pool belonging to Reactor 4. Although this reactor is shutdown, the used rods can still generate sufficient heat to cause such an incident if cooling is ceased. These pools are outside the core containment and so radioactive material released by the fire will have risen into the atmosphere.
The previous hydrogen blast at Reactor 3 has left its spent pool uncovered. A fire here could release toxic plutonium into the environment if MOX fuel rods are involved.
So much for a localised 'Level 4' incident. The situation is dire.
For a socialist perspective from the region, read http://www.socialistworld.net/doc/4929 'Earthquake could leave “tens of thousands” dead and nuclear threat'
and http://www.socialistworld.net/doc/4931 'Disaster hits workers hardest'
UPDATE: While news reports state that 'radiation levels are falling', the readings are still in millisieverts rather than at the lower microsievert levels previously being recorded. Kyodo News reports the following grim overview:
-- Reactor No. 1 - Cooling failure, partial melting of core, vapor vented, hydrogen explosion, seawater pumped in.
-- Reactor No. 2 - Cooling failure, seawater pumped in, fuel rods fully exposed temporarily, vapor vented, damage to containment system, potential meltdown feared.
-- Reactor No. 3 - Cooling failure, partial melting of core feared, vapor vented, seawater pumped in, hydrogen explosion, high-level radiation measured nearby.
-- Reactor No. 4 - Under maintenance when quake struck, fire caused possibly by hydrogen explosion at pool holding spent fuel rods, pool water level feared receding.
FURTHER UPDATE 22.45: A second (or continuing?) fire broke out at reactor No.4 - presumably again from the spent fuel pool. Unlike reactors 5 and 6, where some rods are still stored more safely in the reactor vessel, reports say that ALL of the rods from reactor 4 had been placed in the spent fuel pool - this unfortunately increases the amount of radioactive material that could be released as a result of the fire.
Chernobyl veteran Iouli Andreev has suggested that the storage of so many rods so close to the reactor pointed to the Japanese nuclear industry putting profits before saefty. He also accused the IAEA's emergency team as being "a fake organisation because every organisation which depends on the nuclear industry - and the IAEA depends on the nuclear industry - cannot perform properly. It always will try to hide the reality". http://bit.ly/h7uZ71
After latest fire, radiation levels spiked above 1,000 millisieverts - i.e not micro Sv or milli Sv but 1 Sv. Workers (now facing very serious health risks) also investigating cause of smoke seen above Reactor No.3.