March 12th, 2011 – Looked like a containment building disappearing in an explosive cloud – WTF

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From: Mitchell, Matthew
Sent: Tuesday, March 22, 2011 12:35 PM
To: Cusumano, Victor
Subject: FOIA E-mail #4


From: Mitchell, Matthew
Sent: Saturday, March 12, 2011 8:05 AM
To: Hardies, Robert
Subject: RE: FYI

I’ve seen that as well.

Secondary continment buildings aren’t all that robust, but still…

Apparently no change in the ex-primary containment radiation levels, however, after the explosion.


From: Hardies, Robert . fC’_((
Sent: Saturday, March 12, 2011 5:12 AM
To: Mitchell, Matthew
Subject: RE: FYI

My dog woke me up to go out. I turned on CNN. They had breaking video they could not explain. To me it looked like a containment building disappearing in an explosive cloud. WTF.


From: Mitchell, Matthew ýJ (1
Sent: Friday, March 11, 2011 2:05 PM
To: Hardies, Robert
Subject: FYI

http://www.tepco.co.jp/en/press/corp-com/release/11031204-e.html


Press Releases

Press Release (Mar 12,2011) – Plant Status of Fukushima Daini Nuclear Power Station (as of 0 AM March 12th )

Unit 1 (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
– At 6:08PM, we announced the increase in reactor containment vessel pressure, assumed to be due to leakage of reactor coolant. However, we do not believe there is leakage of reactor coolant in the containment vessel at this moment.

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
– We do not believe there is leakage of reactor coolant in the containment vessel.

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.

Unit 4 (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.

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.

There is no missing person within the power station.

We are presently checking on the site situation of each plant while keeping the situation of aftershock and Tsunami in mind.

A seriously injured worker is still trapped in the crane operating console of the exhaust stack and his breathing and pulse cannot be confirmed.

A worker was lightly injured spraining his left ankle and cutting both knees when he fell while walking at the site. The worker is conscious.




Robert Hardies

Mr. Hardies started his U.S. Nuclear Regulatory Commission (NRC) career in 2005 as a Senior Materials Engineer in the Vessel and Internals Integrity Branch of NRR in DCI. In 2006, Mr. Hardies became Chief of the Component Integrity Branch in the Division of Engineering in the Office of Nuclear Regulatory Research where he was responsible for research related to structural integrity of reactor coolant primary pressure boundary piping and vessels. Prior to joining the NRC, Mr. Hardies worked for the David Taylor Naval Ship Research and Development Center and for 16 years in the commercial nuclear power industry for Constellation Energy. Mr. Hardies received a Bachelor of Science degree in Metallurgy from the Pennsylvania State University and a Master of Science degree in Materials Science and Engineering from the George Washington University.

Page Last Reviewed/Updated Tuesday, May 10, 2011

Matthew Mitchell, Vessels and Internal Integrity Branch Chief CVIB

Nuclear Regulatory Commission
Office of Nuclear Reactor Regulation,
Washington, DC 20555-0001
Phone:301 415-1467
Email: [email protected]
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