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Originally posted by xfooln
The MSM is catching up a bit.
NYT: Executives May Have Lost Valuable Time at Damaged Nuclear Plant
Beyond that there is some modestly good news, if accurate. The article relies on statements of a former senior operator at a Pennsylvania reactor with a similar GE-based design, who said that the cooling systems were a floor beneath the area where explosions occurred in watertight rooms designed to withstand earthquakes. The Fukushima reactors survived the earthquake fairly well. The problems at the site seem to have been triggered by failure of motors and control equipment that were outside these protections and destroyed by the tsunami. So he thought there was a good chance that some cooling systems would be operable after power was restored, though some very dangerous repairs might be needed first.
The key here is they are based on high volume circulation of the water; not on water sitting in the loop and it's only movement due to natural convection; Redneck has made some very astute points on this matter...
One statement in the article surprised me and I'm wondering if our amateur experts know the answer. The article says that because the fuel has continued to cool since the reactors were shut down immediately after the earthquake, only a twentieth of the original amount of water that would have been needed would be enough now to cool the fuel to a stable level. I've seen some data on the rate of cooling of the fuel following a shutdown such as this that would square with this estimate, but it was based on the assumption that the emergency cooling was working throughout the period, which obviously isn't the case here. Is this a clear mistake, or has there been substantial overall cooling despite the partial meltdowns? Or is there too little data to do more than guess?
Fukushima Daiichi plant
-- Reactor No. 1 (Operation suspended after quake)
Partial melting of core, cooling failure, vapor vented, building housing containment of reactor damaged by hydrogen explosion, roof blown off, seawater being pumped in.
-- Reactor No. 2 (Operation suspended after quake)
Damage to reactor containment structure feared, cooling failure, seawater being pumped in, fuel rods fully exposed temporarily, vapor vented, building housing containment of reactor damaged by blast at adjacent reactor No. 3, blast sound heard near suppression chamber of containment vessel, seawater pumped into pool holding spent-fuel rods on Sunday, access to external power restored Sunday.
-- Reactor No. 3 (Operation suspended after quake)
Partial melting of core feared, cooling failure, vapor vented, seawater being pumped in, building housing containment of reactor badly damaged by hydrogen explosion, seawater dumped over spent-fuel storage pool by helicopter Thursday, water sprayed at it from ground for four days in a row through Sunday.
-- Reactor No. 4 (Under maintenance when quake struck)
Renewed nuclear chain reaction feared at spent-fuel storage pool, fire at building housing containment of reactor Tuesday and Wednesday, only frame remains of reactor building roof, temperature in the pool reached 84 C on March 14, water sprayed at pool on Sunday.
-- Reactor No. 5 (Under maintenance when quake struck)
Some fuel rods left in reactor core, cooling in spent-fuel storage pool resumed Saturday, cold shutdown at reactor on Sunday, access to external power restored Sunday.
-- Reactor No. 6 (Under maintenance when quake struck)
Some fuel rods left in reactor core, emergency power generator and cooling functions restored Saturday, cold shutdown at reactor on Sunday.
Originally posted by ljonesyuk
reply to post by iWokeUp
So your uk based and think this is bigger than Chernobyl simply based on some illusional theory that there has been a complete block on all information from japan .... So much so that you won't go there anymore.
Seriously , I think you should tape up all the doors and windows for when the TRUTH COMES OUT.
This will be bigger than Chernobyl for Japan and the U.s purely because of the locality, not so for everyone else . The two cannot be compared at all , one blew death thousands of feet in the air and the other one hasn't and won't.
I'll be the first to say I was wrong if it does but it won't , this time next year no one will even remember what the big deal was .
Some of Britain's best-loved beauty spots turn out to have the highest concentrations of what has been termed the country's worst environmental pollutant. It is an invisible, odourless gas that seeps out of the ground and causes an estimated 1,100 deaths from lung cancer every year. It is called radon and last month the number of homes designated at risk was increased five-fold (from 100,000 to between 500,000 and 600,000), rendering millions more people officially vulnerable.
The basis of this paper is comparative forced vibration testing of two GE 460 MW(e) BWR-type reactor buildings. The tested nuclear power plants are the Fukushima Nuclear Power Plant Unit No. 1 of the Tokyo Electric Power Company (hereinafter referred to as Fukushima) and the Shimane Nuclear Power Plant of the Chugoku Electric Power Company (Shimane). They are almost the same in both structure and function, but are built on rock of quite different rigidity. The shear wave velocity of Shimane is about three times that of Fukushima. The forced vibration tests were performed immediately after completion of each reactor building using a vibrator with a maximum exciting force of 3 t. The computer simulation analyses were carried out using vibration models possessing different internal viscous damping factors for each structural element. Both the resonance periods and damping factors of Fukushima were found to be larger than those of Shimane. Thus, site selection of nuclear power plants must be reviewed as a matter of utmost importance from the viewpoint of seismic design.
Originally posted by Moonbeams771
I watched this HERE excellent documentary and was simply amazed that people could apparently withstand such incredible exposure to radiation without dropping dead on the spot. It certainly challenged my understanding of radiation damage.
Tokyo, March 20 (Jiji Press)--Japan's Defense Ministry on Sunday ordered the Ground Self-Defense Force to send two tanks to the Fukushima No. 1 nuclear plant to remove debris at the quake-hit plant to facilitate work to prevent a radiation disaster.
The Type 74 battle tanks and other relief vehicles left a GSDF garrison in Gotenba, Shizuoka Prefecture, central Japan, in the evening and will arrive in the northeastern prefecture of Fukushima early Monday morning, the ministry said.
As soon as they receive a request for action, the large blade-attached tanks will enter the radiation-exposed plant of Tokyo Electric Power Co. to clear debris from roads for vehicles to spray water to cool nuclear reactors whose safety systems were battered by the 9.0-magnitude quake and subsequent massive tsunami on March 11.
It is very unusual for battle tanks to join disaster relief operations. But the ministry decided on the voluntary deployment because tanks have high radiation protection capabilities and their mobility is also high, it said.
Originally posted by Phage
More progress. Reactors 5 and 6 are in cold shutdown.
Japan Earthquake Update (20 March 2011, 16:20 UTC)
Japanese authorities have notified the IAEA of progress at the Fukushima Daiichi nuclear power plant. Workers today have successfully placed reactor Unit 5 (at 05:30 UTC) and 6 (at 10:27 UTC) into cold shutdown.