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PostPosted: Sep 15, 2014 11:14 am 
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E Ireland wrote:
The pump required to refill an ESBWR's cooling pool is rather small really - its one of those things two people can easily carry.


Its a tiny pump! You can buy one of those in a home depot. They can be carried by a single person. You get a hose, stick the hose in some body of water or connect to a water truck. Then connect the pump to the connection valve in the station yard. This is the fire water connection, very robust and away from the reactor building. The ESBWR has this built-in.

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And I think that it should be possible to use seawater in the IC system without ruining the core since it never coems into contact with it.
But I might be mistaken about that.



Yes, in a pinch you can use seawater. This will ruin the liner and IC SS tubes however, because they are standard 300 series austenitic stainless steel and it does not like boiling seawater. Boiling seawater will probably ruin and crack the tubes in a few months even if they have been fully stress relieved in the weld zone. Still that's pretty good as an emergency solution. It worked fine in Fukushima. The fill up pools are external to the reactor loop so it isn't nuclear.

Boiling seawater is surprisingly nasty. A client of ours had such a system and all austenitics were unsuitable for long term performance. I recommended hyper duplex stainless steels in the fully weld annealed condition. They used this and I'm quite proud to say its working fine. Still, its nasty stuff. Cold seawater isn't actually that bad. Hot seawater is.

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So helicopter-in a small generator and some pipe and use it to pump seawater into a plant in the aftermath of a catastrophic accident.


Helicopter in, or just use one of the many portable pumps available onsite, likely at least one survives. Fire truck is also a good alternative. 7 days is a lot of time even if all the water sources and pumps are destroyed, onsite. Even beyond 7 days some time is available because the RPV can be depressurized and then fed the GDCS water plus suppression pool water via the squib valves. Just needs a tiny amount of DC power. Fukushima proved this can be scavenged from car batteries, though in ESBWR it is 4 division DC power supply so failure of all divisions is very unlikely.

Anyway, all this is horribly off topic. Sorry Kirk.


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PostPosted: Sep 15, 2014 12:15 pm 
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What you are describing is the FLEX program.

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PostPosted: Sep 15, 2014 12:46 pm 
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KitemanSA wrote:
What you are describing is the FLEX program.


FLEX is for existing plants that need rapid intervention. ESBWR is much more casual. The operators can take a holiday before needing to do anything


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PostPosted: Sep 16, 2014 1:00 am 
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So, its lazy FLEX, but still FLEX! ;)

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