burnup calculation problem

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j0937065063
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burnup calculation problem

Post by j0937065063 » Tue Jun 12, 2018 12:22 am

Hello

I am trying to do a single 2D PWR fuel assembly model with ~200 nuclide tracing and about 40 time steps.

It gives me the following error:

- MPI task = 0
- OpenMP thread = 2
- RNG parent seed = 1528751737
- RNG history seed = 5450987530234881657

Fatal error in function TTALoop:

Max length of TTA chain exceeded.


Simulation aborted.

I try to change the nbuf to higher value, but still it gives me the same error somehow.

Is it something to do with memory allocation?

Thanks!


Best,
Vince

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Jaakko Leppänen
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Re: burnup calculation problem

Post by Jaakko Leppänen » Wed Jun 13, 2018 5:47 pm

Which Serpent version are you using?
- Jaakko

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Re: burnup calculation problem

Post by j0937065063 » Wed Jun 13, 2018 6:48 pm

I am using 2.1.30.

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Re: burnup calculation problem

Post by j0937065063 » Wed Jun 13, 2018 6:49 pm

Also I am running it on a Mac OSX High Sierra machine using the -omp option.

I am not sure if it has something to do with that, but just provide the information for diagnostic.

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Re: burnup calculation problem

Post by Jaakko Leppänen » Thu Jun 14, 2018 2:58 pm

Could you send me the input?
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Re: burnup calculation problem

Post by j0937065063 » Thu Jun 14, 2018 4:21 pm

I just send the model to you.

Thanks!

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Re: burnup calculation problem

Post by alexey28 » Thu Jul 01, 2021 9:32 am

I encountered the same problem. How do I solve it?

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Re: burnup calculation problem

Post by alexey28 » Thu Jul 01, 2021 9:59 am

I think this is because I use "actstep" and only count 1 transport cycle.
How to fix this point, I don't know

Code: Select all

set power 295000000
dep daystep 31
set power 606000000
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set power 668000000
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Ana Jambrina
Posts: 683
Joined: Tue May 26, 2020 5:32 pm
Security question 1: No
Security question 2: 7

Re: burnup calculation problem

Post by Ana Jambrina » Thu Jul 01, 2021 10:23 am

Which Serpent version are you running?

The problem arises due to the number of elements within the TTA chain exceeds the maximum value setup in Serpent, 500. Changing the value of parameter MAX_TTA_CHAIN to a higher value might solve the problem (line 20, ‘ttaloop.c’ routine).

However, could you post the input here? Although the error is presented in such form, it might be something else going underneath. The maximum value of 500 for the TTA chain should be, in principle, enough.
- Ana

alexey28
Posts: 75
Joined: Thu Apr 16, 2020 8:05 pm
Security question 1: No
Security question 2: 7

Re: burnup calculation problem

Post by alexey28 » Thu Jul 01, 2021 10:34 am

Version 2.1.32

Ana, Can I email the source code? If yes, please tell me the email address

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