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Concrete free power plant
http://energyfromthorium.com/forum/viewtopic.php?f=64&t=4823
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Author:  E Ireland [ Jan 12, 2018 3:31 am ]
Post subject:  Concrete free power plant

Well Concrete has traditionally be used in power plants because it is very cheap in materials terms, however it now appears that materials costs are not a large fraction of the cost of the plant.
The real costs appear to be in construction step, and concrete is time consuming and expensive to work with, with rebar fabrication, vibration and curing.

It appears likely that cellular steel structures that can be bolted together could replace them, with randomly packed lead shot for gamma shielding, without significantly increasing the materials construction cost.

We could literally make a reactor building roof out of a dozen or more 'slats' for example.
And if we used steel vibration or screw piles we don't even need concrete foundations.
Just a thought

Author:  Cyril R [ Jan 15, 2018 4:30 pm ]
Post subject:  Re: Concrete free power plant

You could also use water as a filler and shielding material. Even cheaper than lead, and it could do double duty as emergency heat sink.

Water here, water there, water everywhere... and not a drop to drink!

Author:  E Ireland [ Jan 18, 2018 8:02 am ]
Post subject:  Re: Concrete free power plant

Problem with using water - beyond the bulk - is that you would have to account for what happens if you actually evaporate the water, or it leaks.

In an accident you could be faced with having to abandon parts of the reactor building, even if the fuel hasn't actually failed yet.

Author:  Cyril R [ Feb 20, 2018 4:40 pm ]
Post subject:  Re: Concrete free power plant

E Ireland wrote:
Problem with using water - beyond the bulk - is that you would have to account for what happens if you actually evaporate the water, or it leaks.

In an accident you could be faced with having to abandon parts of the reactor building, even if the fuel hasn't actually failed yet.


This would depend on the amount of water; if it is large enough to not boil during the worst accident then it obviously isn't an issue - and would improve safety by having a huge and totally passive heat sink.

Bulk is not of much concern for a stationary powerplant. It is an issue of course with any mobile app.

Author:  Koistinen [ Feb 27, 2018 9:05 pm ]
Post subject:  Re: Concrete free power plant

Cyril R wrote:
E Ireland wrote:
Bulk is not of much concern for a stationary powerplant. It is an issue of course with any mobile app.

I guess a ship should not go into a harbour with too little water. Do ships count as mobile apps?

Author:  robert.hargraves [ Feb 28, 2018 6:18 am ]
Post subject:  Re: Concrete free power plant

Here's an animation of a land-based version of ThorCon. The structure is mainly a steel/concrete/steel sandwich. http://thorconpower.com/design/erection

Author:  E Ireland [ Feb 28, 2018 9:10 am ]
Post subject:  Re: Concrete free power plant

I'd prefer to avoid concrete entirely to be honest.

I am thinking cellular steel for structural rigidity, filled with either boron carbide or lead balls for shielding, using sufficiently conservative estimates that random packing can be used as a packing method.

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