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 Post subject: Re: Dual Fluid Reactor
PostPosted: May 30, 2015 12:00 pm 
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Joined: Sep 22, 2013 2:27 pm
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Dear Jagdish,

all serious MSR/MSFR/MCFR concepts are using 3 - circuits to avoid the direct contact liquid salt - water in case of an untightness or failure of the structure. In plenty of reports I found warnings.

Such an untightness would at least let the pressure in the reactor vessel increase to the pressure of the water. The reactor vessel would have to become designed to resist for example 25 or 30 MPa pressure. If the salt pressure is low there is the risk of a steam explosion (I have a test report about lead - water steam explosions) and there might be chemical reactions??? I did not see a test report about the results of such an experiment.

If you have access to a good library I would appreciate it very much if you could look for such a report.


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 Post subject: Re: Dual Fluid Reactor
PostPosted: Jul 27, 2018 1:03 pm 
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Joined: Jul 26, 2018 3:23 am
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It seems that some silicon carbide could withstand the temperature of the reactor and corrosivity of molten lead and chlorine salts.

What I am mostly worried about is the molten lead coolant sloshing during an earthquake. That could break the narrow tubes. Recently I heard a simple solution to that problem: Make the coolant vessel such that the coolant can not slosh. Imagine a bottle half filled with water. Shake the bottle and the water slops around. But if you fill the bottle to the neck, then water won't slosh.

Another problem is this: What if a tube breaks anyway? Will there be a pool of molten salt fuel on top of molten lead, just before the frozen salt plug melts? I think that the shape of the vessel could be a solution to this problem also.

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 Post subject: Re: Dual Fluid Reactor
PostPosted: Jul 27, 2018 1:42 pm 
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With prestressed cast iron I imagine we could engineer a reactor vessel that uses the material that would otherwise be used for radiation shielding to make it capable of withstanding the pressure of the steam circuit.


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 Post subject: Re: Dual Fluid Reactor
PostPosted: Jul 27, 2018 9:22 pm 
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E Ireland wrote:

With prestressed cast iron I imagine we could engineer a reactor vessel that uses the material that would otherwise be used for radiation shielding to make it capable of withstanding the pressure of the steam circuit.


So the reactor vessel including molten lead coolant inside the vessel would still be unpressurized, but the heat exchanger circling the reactor vessel would be pressurized and squeezing the reactor vessel. Did I get it right?

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