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 Post subject: Gas-Cooled Fast Reactors
PostPosted: Jan 10, 2009 10:08 pm 
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Here's a question about one of the "other" Gen-IV proposals: I was wondering if anyone knew how emergency core heat removal is supposed to work in a gas-cooled fast reactor. It seems like an extremely difficult problem, given the high power density of a fast reactor and the sheer amount of gas that would need to be pumped through the core to remove decay heat. What are the proposed solutions to this issue?


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PostPosted: Jan 11, 2009 1:15 am 
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Emergency decay heat removal provides the largest challenge for the GFR, because the fuel has much less thermal inertia than for a thermal spectrum modular helium reactor. The safety approach is to place the primary system in a relatively small, low leakage containment, so that if a large break loss of coolant accident occurs, after the helium vents the pressure in the containment is still high enough that the core can be cooled by natural circulation of the helium (which would not be adequate at atmospheric pressure).


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PostPosted: Jan 11, 2009 5:02 am 
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A barrel shaped core with longer length compared to dia shall enable fffective heat transfer from solid fuel to gas. I am unable to load the sketch.


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PostPosted: Jan 15, 2009 4:49 am 
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Joined: Oct 29, 2007 6:27 pm
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jagdish wrote:
A barrel shaped core with longer length compared to dia shall enable fffective heat transfer from solid fuel to gas. I am unable to load the sketch.


In a fast core? doesn't that result in high leakages and difficulties to reach criticallity?

And as far as I know, they try to increase the thermal inertia of the fuel by using cermaics and special kind of cladding...refractory cladding or so...

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