burnup calculation problem

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Ana Jambrina
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Re: burnup calculation problem

Post by Ana Jambrina » Thu Jul 01, 2021 10:38 am

Under my name on the right side, there is a bullet point that says: "Contact".
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alexey28
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Re: burnup calculation problem

Post by alexey28 » Thu Jul 01, 2021 11:01 am

I have just emailed

Ana Jambrina
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Re: burnup calculation problem

Post by Ana Jambrina » Thu Jul 01, 2021 1:57 pm

I did a quick run in DEBUG mode of the problem without variance reduction since you did not provide the weight-window mesh input or a valid variance reduction card description for me to test it. It seems that the case run without any problem.

Note: you might want to take a look at your input because several options are going to affect the results, e.g., the ‘gcut’ option.
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alexey28
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Re: burnup calculation problem

Post by alexey28 » Fri Jul 02, 2021 10:03 am

i have changed MAX_TTA_CHAIN
I didn't rebuild the program, should I have done that?
Image

but i have the same fatal error again
Image

P.S. This is my weight-window mesh https://yadi.sk/d/NjgyDKqIknQMUg
Last edited by alexey28 on Fri Jul 02, 2021 10:13 am, edited 1 time in total.

alexey28
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Re: burnup calculation problem

Post by alexey28 » Fri Jul 02, 2021 10:12 am

maybe i should use "ttacut"?

Ana Jambrina
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Re: burnup calculation problem

Post by Ana Jambrina » Fri Jul 02, 2021 12:40 pm

Debugging the case the value that could trigger the error is n < MAX_CHAIN_TTA (way below that value). TTA mode is only used in decay steps, when power is set to zero.

In fact, I re-ran the case with the weigh-window mesh (in case it has some effect on it, which was unlikely), and again, the simulation finishes without any error.

The ‘ttacut’ option sets a cut off in the TTA chain based on passage and, any chain accounting for less than the fraction TTACUT of the total atomic density is ignored. In that case ‘ttaloop.c’ routine would not be called.
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alexey28
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Re: burnup calculation problem

Post by alexey28 » Fri Jul 02, 2021 1:02 pm

Ana, thank you!
when I use small values of "nps", it works as well without errors.
When I count nps 100,000,000, for example, the error appears

Antti Rintala
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Re: burnup calculation problem

Post by Antti Rintala » Fri Jul 02, 2021 1:22 pm

Regardin the TTA in decay calculations, you could also try using SSD in set bumode, of course remembering that enough substeps should be taken or the CRAM order to be high enough for the results to be "correct" (https://doi.org/10.13182/NSE15-67).

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Re: burnup calculation problem

Post by Ana Jambrina » Fri Jul 02, 2021 1:22 pm

When you modified the MAX_TTA_CHAIN parameter to some value higher than 500, did you recompile the source? - right now, I cannot run a large case.
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alexey28
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Re: burnup calculation problem

Post by alexey28 » Fri Jul 02, 2021 1:35 pm

Thank you all so much! I will now rebuild and try to run the calculation.

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