Dump Tank design

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alexterrell
Posts: 510
Joined: Sep 02, 2009 10:24 am

Dump Tank design

Post by alexterrell » Feb 09, 2015 6:20 am

The dump tank in a MSR should never be used. After 60 years it should still be clean and radiation free. But if it ever does get used, either by design (ie there's an accident) or accident (ie "failure" of the plug or a "false positive"), what happens once things above have been fixed:

1. Electric heaters (and residual decay) melt the salt and it's pumped back into the reactor or the reprocessing facilities (tricky to do leaving no residue)
2. The dump tank is sealed, raised by the crane, and either sent for reprocessing or long term storage.
3. The dump tank is left in place for a Century or so and then robots will come and clear it up.

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Jim L.
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Joined: Oct 06, 2010 9:12 pm
Location: Cleveland, OH

Re: Dump Tank design

Post by Jim L. » Feb 09, 2015 9:23 am

Actually, the dump tank(s) would be used many times over a 60 year lifetime - basically any time the reactor needed to be stopped. For designs using graphite for moderations and/or reflectors, the graphite would need to be replaced on a regular basis determined by the neutron flux; some designs call for graphite replacement every 4 years. Other reasons to stop the reactor include component replacement, e.g. salt pumps, heat exchangers, turbine, generator.

alexterrell
Posts: 510
Joined: Sep 02, 2009 10:24 am

Re: Dump Tank design

Post by alexterrell » Feb 10, 2015 2:18 am

OK - I was thinking too much of the Thorcon approach.

I suppose if the dump tank is to be used many times, then it needs its own set of pumps and electrical heaters, and it needs to be designed so it can be disassembled at end of life, with the walls treated as Medium Level waste.

Reforming the salt plug might be tricky. Would "routine" dumping be done via the salt plug of a valve from the heat exchanger?

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