Change power density in automated burnup sequence

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Staffan F
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Change power density in automated burnup sequence

Post by Staffan F » Fri Apr 16, 2021 1:52 am

Are there any possibilties to change the power density between different branches in the automated burnup sequence for different burnup points?

Ana Jambrina
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Re: Change power density in automated burnup sequence

Post by Ana Jambrina » Fri Apr 16, 2021 2:37 am

The ‘norm’ variation can be used to change the normalization. The syntax would be the following branch <NAME> norm <NSF>.
The adjustment is made using the parameter ‘NSF’ as a multiplier to the given normalization, e.g. ‘set power’, ‘set powdens’, etc.
- Ana

Staffan F
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Re: Change power density in automated burnup sequence

Post by Staffan F » Sat Apr 17, 2021 11:54 am

That’s good to know. Where in the Serpent 2 documentation can I find information about this subject? I have not found anything about the syntax in the Input syntax manual.

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Re: Change power density in automated burnup sequence

Post by Ana Jambrina » Sat Apr 17, 2021 3:27 pm

Check 'branch' card ('norm' variation).
- Ana

Staffan F
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Re: Change power density in automated burnup sequence

Post by Staffan F » Tue Apr 20, 2021 1:37 pm

Ok, so if I understand it right, NSF relates to e.g the power density which is stated in the first burnup step?

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Re: Change power density in automated burnup sequence

Post by Ana Jambrina » Tue Apr 20, 2021 1:58 pm

‘NSF’ is a normalization scaling factor that multiplies the normalization set in the input at the listed burnup steps when the branch is invoked.
It performs similarly either if it is set a single normalization for the whole depletion sequence, or if it is set a different normalization for each burnup step - the factor would apply to each of them.
- Ana

bursar05
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Re: Change power density in automated burnup sequence

Post by bursar05 » Wed May 19, 2021 9:41 am

Hi all,

I want to change boron concentration, power, and control rod positions between burnup steps. For example after 10 days change this 3 parameters and continue and after 10 days again change this 3 parameters and continue and so on. Is there any input example similar with this calculation?

Ana Jambrina
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Re: Change power density in automated burnup sequence

Post by Ana Jambrina » Wed May 19, 2021 12:59 pm

There is no difference in applying single or multiple variations. The approach to follow can be either manual or through the automated burnup sequence already established in Serpent, both based on restarting the calculation at the given break-point where the variations are applied.
Check the post viewtopic.php?f=15&t=3501#p12101 where both approaches are described for the case of modifying boron concentration.
- Ana

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Re: Change power density in automated burnup sequence

Post by bursar05 » Wed Jun 02, 2021 3:30 am

Thanks for answer Ana.

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Re: Change power density in automated burnup sequence

Post by novako » Thu Jun 10, 2021 4:09 pm

Hi,
I need to change reactor power after some time of burnup calculation, to add outage to my calculation. I read in manual, that instead of decstep I should use daystep with reactor power set to 0. How can I do it? Or can I use the decstep command instead of daystep? I do not use branch calculation.
Thank you
Ondrej

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