Select central fuel tube for pin power

Questions and discussion about applications, input, output and general user topics
armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Select central fuel tube for pin power

Post by armansalehi » Tue Jun 08, 2021 11:34 am

I am trying to calculate the pin power of the central fuel tube of my assembly. At the moment I have created a separate PIN for the central fuel tube in the lattice and I am attempting to set up a detector for that central fuel tube, however I am not sure the results I am getting is correct, since I am unsure that the pin is being selected. I am trying to use "du" to select the pin. Is this correct?

% - Axial power distribution in central fuel pin
det pinpower
du P
dr -8 void
dm fuel % score in fuel
dz -100.0 100.0 25 % 20 axial bins between z=0 and z=200cm

Ana Jambrina
Posts: 551
Joined: Tue May 26, 2020 5:32 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by Ana Jambrina » Tue Jun 08, 2021 11:58 am

The detector scores the macroscopic total fission energy production cross section (mt = -8) at the material of collision point (void) within the spatial integration domain determined by the universe “P” (du), limited to the ’fuel’ material (dm) and z in [-100, 100], setting 25 bins (dz).

Note: check the curvilinear mesh detector ‘dn’ (cylindrical) definition: e.g., det power dr -8 void dn 1 0 0.4025 1 0 360 1 0 200 20
- Ana

armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by armansalehi » Tue Jun 08, 2021 12:48 pm

Great. I think this works with much less complication as my method since we're only defining a cylindrical detector placed in the centre of the core (where the central fuel tube is) and scoring the macroscopic total fission energy produced in that region.

armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by armansalehi » Tue Jun 08, 2021 4:10 pm

Just to clarify, using this method (cylindrical mesh detector), the units will be in MeV/cm or MeV/cm3?

det Power
dr -8 void
dn 1 0 0.4025 1 0 360 1 0 200 20

Ana Jambrina
Posts: 551
Joined: Tue May 26, 2020 5:32 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by Ana Jambrina » Tue Jun 08, 2021 4:25 pm

Detector estimates are integrated over space/energy/direction (and time). For mt = -8 (fission power), the units are Watts.
- Ana

armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by armansalehi » Thu Jun 10, 2021 1:58 pm

Hello again,

For the curvilinear detector (dn), I want to create an axial and radial distribution of power of the core. But I am not entirely sure how to make use of the bins for this purpose. I suppose I can create a Cartesian mesh detector instead where I can select bins for each of the coordinate directions. Is there a way to do the same for the curvilinear detector, or am I missing something?

Thank you

Ana Jambrina
Posts: 551
Joined: Tue May 26, 2020 5:32 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by Ana Jambrina » Thu Jun 10, 2021 2:07 pm

All the mesh detectors work in the same way. In the case of a curvilinear detector, you can define a radial, azimuthal and, axial bin-discretisation (r, theta, z). Just define the radial/azimuthal/axial boundaries and set, for each case, the number of bins.

Note: the bin-volume in a curvilinear detector is not constant since the radial division is equal radius and not equal volume.
- Ana

armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by armansalehi » Thu Jun 10, 2021 2:25 pm

Thank you Ana, I understand exactly how it works now :)

armansalehi
Posts: 15
Joined: Tue May 25, 2021 12:58 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by armansalehi » Wed Jun 30, 2021 12:34 pm

Is there a way to have the curvilinear mesh detector 'dn' located at a specified (x,y) coordinate (similar to the hexagonal 'dh')?
I can see that that we only have parameters related to the geometry of the detector but not able to position where it is in my model.

Ana Jambrina
Posts: 551
Joined: Tue May 26, 2020 5:32 pm
Security question 1: No
Security question 2: 7

Re: Select central fuel tube for pin power

Post by Ana Jambrina » Wed Jun 30, 2021 12:44 pm

There is no such option within the ‘det’ card for curvilinear mesh detectors. However, you can shift the detector itself using transformations, see ‘trans’ card (‘D’, detector mesh option) - available in Serpent 2.1.32. Or vice versa, shift the geometry using universe transformations.
- Ana

Post Reply