
#1
Aug511, 07:14 AM

P: 16

I need some help finding out the energy density of different heavy water reactors. In IAEA research reactor database they only list the thermal output of some HWR  RR, but they lack information about the dimensions of the core, thereby making it difficult to figure out their energy density.
The reason for wanting to find out this is that I want to compare the energy density of other HWR with the HWR Iran are building at Arak. Have a nice weekend 



#2
Aug511, 08:52 AM

Admin
P: 21,637

In addition to thermal power, one would need the dimensions of the core to determine the average power density, or alternatively one would need the dimensions of a particular assembly and the number of assemblies in the core.




#3
Aug611, 02:12 AM

P: 16

I found a crude estimate by comparing IR40 with Dhurva in India and NRU in Canada. Dhruva and NRU's cores are cylindrical with the diameter the same as the height. By assuming that condition for IR40 and taking the energy density of Dhruva I found the dimensions of IR40. But that was only two reactor cores. To find out if this is even close I would like to compare with some other HWR as well.
I think the approach figuring out the assemblies is going to be rather difficult. I could ask the Iranians, but I don't think they'll give me a lot of information :) 



#4
Aug611, 06:11 AM

Sci Advisor
P: 3,151

How to find information about energy density of HWR?
here's an article with a photo of Ahmadenijad looking at a long skinny fuel rod bundle, purportedly for that plant. funny shape for just a 40 mw core..
http://isisonline.org/uploads/isis...August2009.pdf but you probably knew about that. old jim 



#5
Aug711, 03:53 AM

P: 16

Yeah, I read about that. But that makes no sense to me. Why are they making RBMK looking fuel intended for IR40, but have operated a heavy water production plant (HWPP) next door for the last four five years.
Can RBMK fuel even work in a HWR reactor? Are not the fuel rods spaced to tight together for that? So I still assume IR40 is a heavy water reactor. I guess its more expensive to make a HWPP than some mock fuel bundles for confusion... 



#6
Aug811, 06:10 AM

P: 16

With the data from the three reactors I have I end up with this result:
NRU (fueled with LEU): energy density: 11,9 MW_{th} / m^{3} Candu (fueled with SEU): energy density: 7,64 MW_{th} / m^{3} Dhurva (fuel with natural uranium): energy density: 7,41 MW_{th} / m^{3} Taking Iran on its word that IR40 is 40MW, that gives us: volume = thermal power / energy density. I'm also guessing that they will not use LEU fuel since they don't have so much uranium, and if they want to extract pu239 they want a low enrichment. Volume of IR40: 40MW / 7,5 MW_{th} / m^{3} = 5,3 m^{3} I "guess" the dimensions them to be 1,85m in diameter and 1,95m in height. Is this a crazy estimate? Would additional information about other HWR give me a more precise answer? 



#7
Aug811, 12:47 PM

P: 1,030





#8
Aug811, 02:48 PM

P: 16

Then you assume they use RBMK fuel rods? I just cant figure out why they want to use modified RBMK fuel rods. Is not fuel rods the least difficult thing to manufacture for a advanced nuclear state?
To be sure, when literature says "the core" they mean the active region of the fuel rods including moderator and / or coolant + neutron reflector? 


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