Search found 37 matches

by emilf
Tue Sep 20, 2016 10:53 am
Forum: Bugs, problems, questions & feeback
Topic: Generation of reflector constants
Replies: 3
Views: 5246

Re: Generation of reflector constants

the program will first collapse the fine transport cross section into few groups and then calculate the diffusion coefficient as defined - I think yes. In principle it is possible to collapse fine-group data (including fine-group diffusion coefficients) with ZENITH (not too straight forward). Alter...
by emilf
Mon Sep 12, 2016 12:54 pm
Forum: Bugs, problems, questions & feeback
Topic: Generation of reflector constants
Replies: 3
Views: 5246

Re: Generation of reflector constants

Hi Giorgio, In Helios, there are several option for extracting diffusion coefficients: 1. Using 1/3/tr where tr is a flux-weighted transport XS 2. Using dr/3/tr where dr is a ratio of the B1 diffusion coefficient to the tr-based diffusion coefficient You probably use tr for your reflector. In this c...
by emilf
Fri Oct 02, 2015 4:13 pm
Forum: Bugs, problems, questions & feeback
Topic: Special entries in the inventory list
Replies: 1
Views: 4923

Special entries in the inventory list

Very useful special entries in the inventory list (fp, act, ...), which were available in Serpent 1, are not available in Serpent 2.
Is there any special reason for that?
by emilf
Fri Oct 02, 2015 4:10 pm
Forum: Bugs, problems, questions & feeback
Topic: Depletion and decay calculations with partition
Replies: 0
Views: 29720

Depletion and decay calculations with partition

Jaakko, I'm interested in the following calculational root: (1) depletion + (2) decay (cooling) + (3) removal of certain actinides (back to reactor) + (4) decay of the remaining nuclides (sent to repository) I can easily obtain concentration of actinides for stage 3. The point is that at stage 4 I h...
by emilf
Fri Oct 02, 2015 2:41 pm
Forum: Bugs, problems, questions & feeback
Topic: Analog reaction rate estimators question
Replies: 8
Views: 5957

Re: Analog reaction rate estimators question

I think one should use the produced CR values with caution. This approach is suitable for thermal systems (I would also add Pu-240 to fertile nuclides). However, I think it is too simplistic for fast systems. For instance, even-N Pu and some MA nuclides are also fissionable. Pu-241 is better fissile...
by emilf
Mon Jan 19, 2015 10:48 am
Forum: Input
Topic: Warning: Negative values in homogeneous flux solution
Replies: 3
Views: 3292

Re: Warning: Negative values in homogeneous flux solution

B1 calculations cannot be done for non-multiplying regions.
Are sure that all the listed universes (130, 200, 309, 369, 406 and 409) have a fissile material?
by emilf
Mon Sep 01, 2014 3:57 pm
Forum: Bugs, problems, questions & feeback
Topic: A bug in the *_his0.m file
Replies: 3
Views: 2403

Re: A bug in the *_his0.m file

It works
by emilf
Fri Aug 29, 2014 11:01 am
Forum: Bugs, problems, questions & feeback
Topic: A bug in the *_his0.m file
Replies: 3
Views: 2403

A bug in the *_his0.m file

Hi Jaakko, I generated a history output with v.2.1.21 and it seems that there is a bug there. The cycle-wise values of k-eff are multiplied by 4 while cumulative mean values are OK. I used 4 MPI processes so I think that 4 comes from there: HIS_IMP_KEFF = [ 1 3.47150E+00 8.67876E-01 0.00066 2 3.8523...
by emilf
Mon Jun 03, 2013 4:53 pm
Forum: Bugs, problems, questions & feeback
Topic: Few-group XS in Serpent 2.1.13
Replies: 1
Views: 2482

Few-group XS in Serpent 2.1.13

It seems that Serpent 2.1.13 ignores a number of groups specified in "set nfg" and generates two-group XSs with a 0.625eV cut-off I defined "set nfg 70" and got % Parameters for group constant generation GC_UNIVERSE_NAME (idx, [1: 1]) = '0' ; GC_NE (idx, 1) = 2 ; GC_BOUNDS (idx, [1: 3]) = [ 2.00000E...
by emilf
Tue Jan 29, 2013 3:53 pm
Forum: Events and publications
Topic: ESFR modeling with HELIOS-2, Serpent, and DYN3D
Replies: 0
Views: 7289

ESFR modeling with HELIOS-2, Serpent, and DYN3D

Paper: "Neutronic analysis of SFR core with HELIOS-2, Serpent, and DYN3D codes"
http://www.sciencedirect.com/science/ar ... 4912004756