Fukushima Meltdown; A Nuclear Disaster

Nuclear Power? No Thanks!

If the disaster at Fukushima does not fully discredit the nuclear industry, I don't know what will. Simply the cost of cleaning up the mess at those nuclear reactors should deter any further reliance on what has always been an inherently unsafe and expensive method of producing power.

The real reason the British state has pumped so much investment into nuclear over the years is nothing to do with power generation, it is to do with having the nuclear material available to make nuclear weapons, so that they can remain one of the 'big boys' club of countries with a nuclear capability.

I'm reposting this excellent article by Martin Powell Davies, a member of the National Union of Teachers National Executive, written in his personal capacity:

News overnight from Japan must surely now shake even the firmest 'accident-deniers' from the nuclear industry into recognising that Fukushima is now the world's second worst nuclear disaster - with long-term consequences.

It seems that last night's blast at reactor no.2 was NOT another hydrogen explosion but a possible breach of the suppression chamber wall INSIDE the containment vessel. This is potentially a far more serious situation. 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.

Some operators have been evacuated, others are bravely staying on site to try and maintain water injection. However, there are too many different emergencies for the staff to deal with at once with the limited resources that they have at their disposal.

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 in 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 fire has now taken hold at reactor No.4 - presumably again from the spent fuel pool. Unlike reactors 5 and 6, where some rods are still in the reactor, 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.