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[Various] Japan Nuclear Emergency - Continuous Coverage of Damage and Radiation Risks - Page 76  

post #751 of 2836
Quote:
Originally Posted by Lampen View Post
OP Updated - Special Announcement - The US Nuclear Regulatory Commission (NRC) has said it does not foresee harmful levels of radiation reaching the US from the damaged Japanese nuclear power plants. "All the available information indicates weather conditions have taken the small releases from the Fukushima reactors out to sea away from the population," a statement said. "Given the thousands of miles between the two countries, Hawaii, Alaska, the US Territories and the US West Coast are not expected to experience any harmful levels of radioactivity.
THANK YOU SIR
Or does this only apply to the small releases that have happened so far? What if a bigger release were to happen on a worst case scenario?
post #752 of 2836
http://af.reuters.com/article/energy...00708120110313
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post #753 of 2836
Thread Starter 
Op Updated - Massive Press Update Incoming

Fukushima Daiichi Nuclear Power Station

All 6 units of Fukushima Daiichi Nuclear Power Station have been shut down.

[There is no update from the previous press release.]

Unit 1(Shut down)
- Reactor has been shut down. However, the unit is under inspection due to the explosive sound and white smoke that was confirmed after the big quake occurred at 3:36PM.
- We have been injecting sea water and boric acid which absorbs neutron into the reactor pressure vessel.

Unit 2(Shut down)
- Reactor has been shut down and Reactor Core Isolation Cooling System has been injecting water to the reactor. Current reactor water level is lower than normal level, but the water level is steady. After fully
securing safety, measures to lowering the pressure of reactor containment vessel has been taken, under the instruction of the national government.

Unit 3(Shut down)
- Reactor has been shut down. However, as High Pressure Core Injection System has been automatically shut down and water injection to the reactor was interrupted, following the instruction by the government and with fully securing safety, steps to lowering the pressure of reactor containment vessel has been taken. Spraying in order to lower pressure level within the reactor containment vessel has been cancelled.
- After that, safety relief valve has been opened manually, lowering the pressure level of the reactor, which was immediately followed by injection of boric acid water which absorbs neutron, into the reactor pressure vessel.

Unit 4 (shut down due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage inside the reactor containment vessel.

Unit 5 (outage due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage inside the reactor containment vessel.

Unit 6 (outage due to regular inspection)
- Reactor has been shut down and sufficient level of reactor coolant to ensure safety is maintained.
- Currently, we do not believe there is any reactor coolant leakage inside the reactor containment vessel.

Casualty
- 2 workers of cooperative firm were injured at the occurrence of the earthquake, and were transported to the hospital.
- 1 TEPCO employee who was not able to stand by his own with his hand holding left chest was transported to the hospital by an ambulance.
- 1 subcontract worker at important earthquake-proof building was unconscious and transported to the hospital by an ambulance.
- The radiation exposure of 1 TEPCO employee, who was working inside the reactor building, exceeded 100mSv and was transported to the hospital.
- 2 TEPCO employees felt bad during their operation in the central control rooms of Unit 1 and 2 while wearing full masks, and were transferred to Fukushima Daini Power Station for consultation with
a medical advisor.
- 4 workers were injured and transported to the hospital after explosive sound and white smoke were confirmed around the Unit 1.
- Presence of 2 TEPCO employees at the site are not confirmed

Others
- We are currently coordinating with the relevant authorities and departments as to how to secure the cooling water to cool down the water in the spent nuclear fuel pool.
- We measured radioactive materials inside of the nuclear power station area (outdoor) by monitoring car and confirmed that radioactive materials level is higher than ordinary level. Also, the level at monitoring post is higher than ordinary level. We will continue to monitor in detail the possibility of radioactive material being discharged from exhaust stack or discharge canal. The national government has instructed evacuation for those local residents within 20km radius of the periphery because it's possible that radioactive materials are discharged.

- We will continue to take all measures to restore the security of the
site and to monitor the environment of the site periphery.

Fukushima Daini Nuclear Power Station

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 is in progress to achieve reactor cold shutdown.

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.

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.
Edited by Lampen - 3/13/11 at 1:34pm
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post #754 of 2836
So thats good news.
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post #755 of 2836
Recent concerns have been raised about Reactor #3 due to its status as a MOX reactor, meaning it utilizes Uranium-235 and Plutonium-239 as fuel.

And what does that mean?
post #756 of 2836
Quote:
Originally Posted by aweir View Post
that's it I'm not sleeping tonight. this is starting to get really, really scary. this is one of the only times i ever remember a single event turning into a chain reaction of potentially globally catastrophic events.
You live in NY dude! Nothing will happen
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post #757 of 2836
Quote:
Originally Posted by aweir View Post
Recent concerns have been raised about Reactor #3 due to its status as a MOX reactor, meaning it utilizes Uranium-235 and Plutonium-239 as fuel.

And what does that mean?
it could release alot more radiation than the other reactors IF it blew.
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post #758 of 2836
I clicked the wrong quote link..
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post #759 of 2836
where did you get this press release from japan lampen??
seems like nhk world doesn't cover the nuclear plants at this moment
where you getting these updates ?
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post #760 of 2836
Thread Starter 
Quote:
Originally Posted by molino View Post
where did you get this press release from japan lampen??
seems like nhk world doesn't cover the nuclear plants at this moment
where you getting these updates ?
http://www.tepco.co.jp/en/index-e.html

TEPCO - Owner/Operator of Nuclear Plants in Fukushima. I've been trying to get through for updates for quite a while now. It's hit or miss if you can get into their press room.

Coverage is going down because the situation has greatly stabilized and the media is penetrating further into disaster areas so the news diverting it's attention. Sort of like what's happened with Libya. Ghaddfi's forces have been pushing the resistance back further and further and now that the world is distracted by Japan the Libyans are going to experience brutal reprisals.
Edited by Lampen - 3/13/11 at 1:48pm
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