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Re: Tsunami and the Daiichi Nuclear Power Plant

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Thanks Harold. This is an exceptionally important topic for me because of my nuclear background.

Our local nuclear sector is having an all hands on deck mode of operation, we will probably be doing a total seismic reevaluation for our plants.
In our standards, there is a direct prohibition to build NPPs in tsunami prone areas, but to my understanding Japan has not had any choice with this.

I had some contact with acquaintances from Japan right after the quake, but that was mainly about our previous Chernobyl experience and decontamination issues.
We are going to have a meeting at IAEA this September and I hope to get some first hand details about the whole thing.

On 15 April 2011 21:25, Harold Sprague <spraguehope(--nospam--at)> wrote:

"The 869 Jogan tsunami deposit and recurrence interval of large-scale tsunami on the Pacific coast of northeast Japan"
The bottom line is that an 8 m tsunami in the Sendai plane had about a mean recurrence interval of about 800 to 1,100 years.  Let's call it an 8 m tsunami height with a 1,000 year mean recurrence infterval.  This was from a report developed in Japan about 10 years ago and predicated on past tsunamis. 
The tsunami wave height at Fukushima is currently listed by the Japan Meteorological Society at 7.3 m, but this will likely be revised.
Japan Meteorological Society investigators can't access the site because of the radioactive contamination. 
The tsunami wall at the Fukushima Daiichi nuclear power plant was constructed for a 5.7 m tsunami. 
There are water marks on the walls at Daiichi that indicate a tsunami maximum indundation height of 15 m. 
It is not known to what probability the 5.7 m wall was predicated.  But by observation the 5.7 m wall was significantly less than the 1,000 year mean recurrence interval that was published 10 years ago. 

Regards, Harold Sprague

Alexander Bausk
Civil/Structural design & inspection engineer, CAD professional
MSc Structural engineering, Ph.C. Engineering
Dnipropetrovsk, Ukraine
Tel. +38 068 4079692
Fax. +38 0562 470263