[ RadSafe ] Japanese Reactors - Blow Out Panels?

[Jaro Franta]

Robert,

According to this ORNL paper,
http://www.osti.gov/bridge/servlets/purl/5835351-nR29Hq/5835351.pdf 

"Secondary containment above the reactor building is provided by a
.
refuelling bay which is constructed of corrugated sheet metal walls that
contain large blowout panels to provide protection from the effects of
tornados and steam line breaks.

The refuelling bay siding is designed to withstand internal pressure in
excess of 57.6 lb/ft^2 (2758 Pa) without structural failure. Pressures in
excess of 50 lb/ft^2 (2394 Pa) will, however, be relieved by blowout panels
in the siding."

 Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Robert Atkinson
Sent: March-13-11 1:14 PM
To: The International Radiation Protection (Health Physics) Mailing List
Subject: Re: [ RadSafe ] Japanese Reactors - Blow Out Panels?

In the video I've seen there were clearly large lightweight panels or sheets
being blown away. These could be standad steel or alloy panels that are used
to clad steel frame buildings. Blow-out capability automatically included.
 
Robert Atkinson.

--- On Sun, 13/3/11, Jaro Franta <jaro-10kbq at sympatico.ca> wrote:


From: Jaro Franta <jaro-10kbq at sympatico.ca>
Subject: Re: [ RadSafe ] Japanese Reactors - Blow Out Panels?
To: "'The International Radiation Protection (Health Physics) Mailing List'"
<radsafe at health.phys.iit.edu>
Date: Sunday, 13 March, 2011, 14:52


Hi Wes,

Regarding "the lower panels are still in place" -- please note that the
lower part of the building is a massive concrete structure, not at all like
the steel frame top part:
http://www.nei.org/filefolder/BoilingWaterReactorDesign_3.jpg 

The blow-out panels I've seen elsewhere are designed to preserve the walls
and roof of such steel frame structures (such as the buildings housing steam
turbines) by allowing a sizeable fraction of the walls to give way with
little effort. This technology is commonly used in other industries as well,
including agriculture.

Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^



-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of
WesVanPelt at verizon.net
Sent: March-13-11 10:05 AM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: [ RadSafe ] Japanese Reactors - Blow Out Panels?

The link below supplied by Jaro shows Unit 1 after the hydrogen explosion.
The upper panels on the building are cleanly gone, and the lower panels are
still in place. This suggests to me that the upper part of the building had
"blow out panels" designed to detach during an explosion.

Any comments from you engineers? 

Best regards,  Wes
Wesley R. Van Pelt, PhD, CIH, CHP 
Wesley R. Van Pelt Associates, Inc.  
 

-----Original Message-----
From: radsafe-bounces at health.phys.iit.edu
[mailto:radsafe-bounces at health.phys.iit.edu] On Behalf Of Jaro Franta
Sent: Saturday, March 12, 2011 8:12 PM
To: 'The International Radiation Protection (Health Physics) Mailing List'
Subject: Re: [ RadSafe ] Link to good before/afetr pix of reactor building

Try this one Mark:

http://tinyurl.com/6yuzrz8 


Jaro
^^^^^^^^^^^^^^^^^^^^^^^^^


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