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Re: [cdn-nucl-l] Fukushima explosion #2: Why didn't they vent theouter building?

To: Jaro Franta <jaro-10kbq@sympatico.ca>
Subject: Re: [cdn-nucl-l] Fukushima explosion #2: Why didn't they vent theouter building?
From: Andrew Daley <daley.andrew@gmail.com>
Date: Mon, 14 Mar 2011 18:59:36 -0400
Cc: cdn-nucl-l@mailman1.cis.mcmaster.ca
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Speculation only (and correct me if I am out to lunch but I swear I read this somewhere over the past few days).

My understanding is that the BWR Mark I containment design did not originally have a "venting" capability.

The original design assumption being that the pressure suppression in the torus would be sufficient. Only later were events (or dual failure events) postulated that would overwhelm the capability of the torus, thus the need to vent the torus.

By back fitting a venting system instead of designing from scratch would have necessitated some concessions...

????

On Mon, Mar 14, 2011 at 5:19 PM, Jaro Franta <jaro-10kbq@sympatico.ca> wrote:

You must be reading my mind Bill – I’ve been asking the same question for the last couple of days.

Perhaps one possibility is that door frames were slightly deformed as a result of the earthquake, and could no longer be opened manually (electric garage door motors would be no use in the power outage…)

But why have the vent going into the building in the first place ? ….why not vent directly outside, knowing the hydrogen situation ?

Beats me !

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

From: cdn-nucl-l-admin@mailman1.CIS.McMaster.CA [mailto:cdn-nucl-l-admin@mailman1.CIS.McMaster.CA] On Behalf Of Bill Garland
Sent: March-14-11 5:03 PM
To: cdn-nucl-l@mailman1.CIS.McMaster.CA
Subject: [cdn-nucl-l] Fukushima explosion #2: Why didn't they vent the outer building?

Folks,

Anyone care to speculate why they did not open the doors or otherwise vent the outer building on these reactors. Presumably they knew there was hydrogen building up (or potentially building up) given that they had one explosion already. Seems like a no-brainer from this distance. What am I missing?

Bill
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