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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 105  

post #1041 of 2836
Thread Starter 

New video from Reuters. Thanks to molino for bringing it to my attention.

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post #1042 of 2836


this is a time lapse photo of the explosion this morning.
post #1043 of 2836
Hmmm.

Quote:
1422: Japanese engineer Masashi Goto, who helped design the containment vessel for Fukushima's reactor core, says the design was not enough to withstand earthquakes or tsunamis and the plant's builders, Toshiba, knew this. More on Mr Goto's remarks to follow.
Quote:
1426: Mr Goto says his greatest fear is that blasts at number 3 and number 1 reactors may have damaged the steel casing of the containment vessel designed to stop radioactive material escaping into the atmosphere. More to follow.
Quote:
1431: More from Japanese nuclear engineer Masashi Goto: He say that as the reactor uses mox (mixed oxide) fuel, the melting point is lower than that of conventional fuel. Should a meltdown and an explosion occur, he says, plutonium could be spread over an area up to twice as far as estimated for a conventional nuclear fuel explosion. The next 24 hours are critical, he says.
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post #1044 of 2836
What is the worst case scenario at this current moment?
post #1045 of 2836
Quote:
Originally Posted by Tunapiano View Post


this is a time lapse photo of the explosion this morning.
it looks like a mushroom cloud?
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post #1046 of 2836
Quote:
Originally Posted by rocstar96 View Post
it looks like a mushroom cloud?
What I thought too :/ But I guess it's just a regular explosion - 'm not expert at this field tho.
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post #1047 of 2836
Thread Starter 
Yeah I saw that interview with Masashi Goto. I'd be interested to see his evidence that Toshiba Heavy Industries knew that their designed wouldn't be able to survive an earthquake/tsunami considering Plant #1 has been taking hits from both for decades. I remember reading somewhere that all the reactors in Plant #1's reactors were all designed to survive at least 8.0 earthquakes. Didn't see anything on tsunami's though.

It looks like a mushroom cloud?

Ok first of all you will never see a mushroom cloud coming out of a nuclear power plant unless some drops an actual NUCLEAR WEAPON on it. The Uranium and Plutonium used in nuclear reactors is barely enriched, usually somewhere between 3-5% purity. You need an absolute minimum of 20% purity to use it in a nuclear device. However when you have incredibly low purity you need a TON of nuclear material to create a weapon. The more pure your material is, the less you need of it. Hence why the nuclear material in modern warheads can typically be held in your cupped hands.

Anyway it doesn't really look like a mushroom cloud, but the shape is generated by the explosion moving upward and outward and then the steam that was still being released from the reactor was continuing to push the debris cloud upward producing the shape.
Edited by Lampen - 3/14/11 at 8:00am
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post #1048 of 2836
Quote:
Originally Posted by rocstar96 View Post
it looks like a mushroom cloud?
Most large explosions make a 'mushroom' cloud, its not limited to only nuclear/atomic explosions.
    
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post #1049 of 2836
Quote:
Originally Posted by rocstar96 View Post
I hope this doest reach the philippines
Probably won't, winds are eastbound this time around so I'm gonna be getting all the horror
I've already seen the explosion, I found the footage on YouTube and posted it here first back around page 69... it looked pretty big, and I'm surprised it didn't damage the containment building
post #1050 of 2836
bbc did a great job covering all the most asked questions
http://www.bbc.co.uk/news/world-asia-pacific-12732015
also TEPCO posted the lastest status on the Plant Status of Fukushima Daini

Quote:
Press Release (Mar 14,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 8:00 am March 14th)
[New Items are underlined]

Unit 1 (shut down at 2:48pm on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- At 8:19am, Mar 12th, there was an alarm indicating that one of the
control rods was not properly inserted, however, at 10:43am, Mar 12th
the alarm was spontaneously called off. Other control rods has been
confirmed that they are fully inserted (reactor is in subcritical
status)
- Status of main steam isolation valve: closed
- Injection of water into the reactor is done by Make-up Water Condensate
System.
- We do not believe there is leakage of reactor coolant in the containment
vessel at this moment.
- At 5:22am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost, at
5:22am, Mar 12th, it was determined that a specific incident stipulated
in article 15, clause 1 has occurred.
- We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 9:43am, Mar 12th and finished at 6:30pm, Mar 12th.
- Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 1:24 am, Mar 14th.

Unit 2 (shut down at 2:48pm on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- Injection of water into the reactor is done by Make-up Water Condensate
System.
- We do not believe there is leakage of reactor coolant in the containment
vessel.
- At 5:32am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost,
at 5:32am, Mar 12th, it was determined that a specific incident
stipulated in article 15, clause 1 has occurred.
- We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. This preparation
work started at around 10:33am, Mar 12th and finished at 10:58pm, Mar
12th.
- Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.
- Restoration work in reactor cooling function that was conducted to
achieve reactor cold shutdown has been completed and cooling of the
reactor has been commenced at 7:13 am, Mar 14th.

Unit 3 (shut down at 2:48pm on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- We do not believe there is leakage of reactor coolant in the containment
vessel.
- We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 12:08pm, Mar 12th and finished at 12:13pm, Mar
12th.
- Reactor cold shutdown at 12:15pm, Mar 12th

Unit 4 (shut down at 2:48pm on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- At 0:43PM, there was a signal indicating that one of the control rods
may have not properly inserted. However, we confirmed that it was
inserted completely by another signal. We will inspect the reason of
this.
- Status of main steam isolation valve: closed
- Injection of water into the reactor is done by Make-up Water Condensate
System.
- We do not believe there is leakage of reactor coolant in the containment
vessel.
- In order to cool down the reactor, injection of water into the reactor
had been done by the Reactor Core Isolation Cooling System, however,
At 6:07am, Mar 12th, the temperature of the suppression chamber exceeded
100 degrees. As the reactor pressure suppression function was lost, at
6:07am, Mar 12th, it was determined that a specific incident stipulated
in article 15, clause 1 has occurred.
- We decided to prepare implementing measures to reduce the pressure of
the reactor containment vessel (partial discharge of air containing
radioactive materials) in order to fully secure safety. The preparation
woke started at around 11:44am, Mar 12th and finished at around 11:52am,
Mar 12th.
- Restoration work in reactor cooling function is in progress to achieve
reactor cold shutdown.

Indication from monitoring posts installed at the site boundary did not
show any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We
will continue to monitor in detail the possibility of radioactive material
being discharged from exhaust stack or discharge canal.
and also few confirmation on what happened at Fukushima Daiichi Nuclear Power Station Unit 3

Quote:
Press Release (Mar 14,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of 8:00 am March 14th)
At approximately 11:01am, an explosion followed by white smoke occurred
at the reactor building of Unit 3. It was believed to be a hydrogen
explosion.

According to the parameter, it is believed that the reactor containment
vessel remains intact. However, the status of the plant and the impact
of radioactive materials to the outside environment are presently under
investigation. (previously announced)

As of 1:30 pm, 4 TEPCO employees and 3 workers from other companies have
sustained injuries (all of them are conscious). 3 ambulances are in
operation to care for them and 2 have already dispatched the casualties
to the hospital.

As of 0:30 pm, the measured value of radiation dose near MP6 was 4μSv/h.
The increase of the radiation dose cannot be confirmed at this time.

As of 0:30 pm, the measured value of radiation dose at the monitoring
post in Fukushima Daini Power Station located approximately 10 km south
of Fukushima Daiichi Power Station remains at the same level.

In light of the incidents that have occurred at Units 1 and 3, we are
considering applying prevention measures to the wall of the reactor
building to ventilate the hydrogen gas contained in Unit 2.

TEPCO continues to take all measures to restore the safety and security
of the site and are monitoring the site's immediate surroundings.

Edited by molino - 3/14/11 at 8:10am
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