Detector reading

Questions and discussion about applications, input, output and general user topics
Post Reply
Husamkh
Posts: 2
Joined: Tue Mar 10, 2020 5:38 pm
Security question 1: No
Security question 2: 7

Detector reading

Post by Husamkh » Tue Mar 10, 2020 5:48 pm

Hello.
I am using serpent for depletion calculations and I am tallying the fission rate. at the EoC I set the power to zero to simulate decay mode. after that I get zero detector output for the last two burn up steps. do you know how could I solve this problem. I tried to place an extra dummy BU step at the end of the cycle, but this is putting extra computation effort and cost. so is there any other possible solution for that problem ? here is my input example.

set power 3983.0E6

dep daytot
50.000
100.000
150.000
200.000
300.000
400.000
490.000

set power 0.0

dep daytot
511.00



and the detector card:

det Radial_pow
dr -6 void
dx -177.44277 177.44277 17
dy -177.44277 177.44277 17

thanks.

Ville Valtavirta
Posts: 450
Joined: Fri Sep 07, 2012 1:43 pm
Security question 1: No
Security question 2: 92

Re: Detector reading

Post by Ville Valtavirta » Wed Mar 11, 2020 11:52 am

I'm sorry, why are you not actually using decay mode for the simulation?

If you explicitly want to do burnup instead of decay, I would advice using a very low power instead of zero. I.e. something like 1e-6 Watt.

-Ville

Husamkh
Posts: 2
Joined: Tue Mar 10, 2020 5:38 pm
Security question 1: No
Security question 2: 7

Re: Detector reading

Post by Husamkh » Sat Mar 21, 2020 1:10 pm

Actually I also tried the decay mode but this also gave me a zero flux reading for the last depletion step. the trivial solution I made was to place a dummy step at the end of the depletion cycle ( like 480.0001 day ) that works but it increases the total calculation time and I thought there might be another possible way or I might be doing something wrong. Nevertheless, this might be also a bug in the serpent and btw currently I am using Serpent 2.129.


thanks.

User avatar
Jaakko Leppänen
Site Admin
Posts: 2315
Joined: Thu Mar 18, 2010 10:43 pm
Security question 2: 0
Location: Espoo, Finland
Contact:

Re: Detector reading

Post by Jaakko Leppänen » Sat Mar 21, 2020 1:26 pm

If you are not using decay steps, the zero detector results come from normalization. When you set power to zero, all your detector results are also multiplied by zero.
- Jaakko

Post Reply