Search found 68 matches

by Antti Rintala
Wed May 05, 2021 9:54 am
Forum: Users
Topic: Scattering Order
Replies: 4
Views: 64

Re: Scattering Order

What do you mean exactly? The Serpent output is just a list of values, and during post-processing you can manipulate the order of the values as you like. The reshape command is an example how to obtain a matrix of the scattering values. It depends on the final usage whether this matrix is transposed...
by Antti Rintala
Wed May 05, 2021 9:39 am
Forum: Users
Topic: Scattering Order
Replies: 4
Views: 64

Re: Scattering Order

Your quotation and proposed correction are the same definition. You are just writing \Sigma_{g, g'} as Sigma(g',g).
by Antti Rintala
Tue Apr 20, 2021 7:42 am
Forum: Users
Topic: Total microscopic scattering matrix for selected isotopes
Replies: 4
Views: 112

Re: Total microscopic scattering matrix for selected isotopes

Microscopic scattering cross sections are not currently calculated by Serpent. This would require some additional functionality for sampling the scattering reactions.

For all materials in the set mdep card, the material volumes have to be defined.
by Antti Rintala
Fri Mar 19, 2021 8:53 am
Forum: Users
Topic: Micro / macro group structure effects
Replies: 6
Views: 261

Re: Micro / macro group structure effects

Replicating the Serpent results with a nodal program depends a lot (for example) on what kind of model you are trying to model and how, and what results of the Serpent group constant output you are using. Without any details, there is not much to say on this matter.
by Antti Rintala
Thu Mar 18, 2021 8:44 am
Forum: Users
Topic: Micro / macro group structure effects
Replies: 6
Views: 261

Re: Micro / macro group structure effects

What did you exactly calculate with Serpent and how, and what did you calculate with the nodal program? And what was the problem with the results?
by Antti Rintala
Mon Mar 01, 2021 11:06 am
Forum: Development
Topic: 2.1.32 - More versatility to automated burnup sequence with casematrix input
Replies: 0
Views: 93

2.1.32 - More versatility to automated burnup sequence with casematrix input

In addition to the coef input card, which could be used to e.g. calculate group constants at multiple state points with single depletion history, Serpent now supports calculating multiple different histories given with branch cards and then e.g. calculate group constants at multiple state points for...
by Antti Rintala
Mon Mar 01, 2021 9:11 am
Forum: Development
Topic: 2.1.32 - New CRAM and predictor and predictor-corrector calculation features
Replies: 0
Views: 93

2.1.32 - New CRAM and predictor and predictor-corrector calculation features

With set bumode (https://serpent.vtt.fi/mediawiki/index.php/Input_syntax_manual#set_bumode) now IPF form of CRAM is possible to be used with orders 16 and 48. Additionally, if a new parameter SSD is nonzero, also decay calculations and/or low power burnup calculations are calculated with CRAM. The u...
by Antti Rintala
Mon Mar 01, 2021 9:04 am
Forum: Development
Topic: 2.1.32 - microscopic group constant calculation with set mdep
Replies: 0
Views: 91

2.1.32 - microscopic group constant calculation with set mdep

The methodology, fourth input option and the output was changed. Multiple set mdep cards per universe can be given. The outputs for different set mdep cards are given in XS_<uni>_<idx> tables, whre <idx> is the index of the set mdep card. In the microscopic cross section output file, fourth and fift...
by Antti Rintala
Mon Mar 01, 2021 8:52 am
Forum: Development
Topic: 2.1.32 - poison cross section calculation with set poi
Replies: 0
Views: 90

2.1.32 - poison cross section calculation with set poi

The methodology and third input option was changed. With also non-zero distribution of poison nuclides, now e.g. INF_XE135_MICRO_ABS should be equal to INF_XE135_MACRO_ABS*N_XE135, where N_XE135 is the nuclide density of XE135 smeared to the total universe volume. Old parameter VR is now VOL, which ...
by Antti Rintala
Mon Feb 22, 2021 2:11 pm
Forum: Users
Topic: Different diameters for pins
Replies: 7
Views: 288

Re: Different diameters for pins

I'd imagine that if you create such universes of fuel assemblies (and assign them to some other universe than the root one) and include those fuel assembly universes in a core level lattice, you don't have to worry about the global coordinates of the big pins, as the fuel assembly universes are cent...