Search found 65 matches

by Tuomas Viitanen
Thu Oct 06, 2016 10:11 am
Forum: Validation
Topic: ICSBEP Benchmarks
Replies: 8
Views: 30633

Re: ICSBEP Benchmarks

Hi Jan! A criticality safety validation package has indeed been developed at VTT. The package currently involves several validation cases for various light water reactor geometries from the ICSBEP, including some VVER cases. The script runs test cases automatically and prints out a criticality valid...
by Tuomas Viitanen
Tue May 17, 2016 4:31 pm
Forum: Bugs, problems, questions & feeback
Topic: SERPENT 2.1.26 // Possible bug in OTF S(a,b) treatment
Replies: 2
Views: 5337

Re: SERPENT 2.1.26 // Possible bug in OTF S(a,b) treatment

Hi, There, indeed, is a minor problem in the temperature interval checks. I wonder how this error was not noticed previously... Anyway, the fix is quite simple: Just change the if-sentence near line 58 of otfsabxs.c to if (RDB[sab2 + SAB_T] > T || (RDB[sab2 + SAB_T] == T && NextItem(sab2) < VALID_PT...
by Tuomas Viitanen
Fri Jan 08, 2016 2:15 pm
Forum: Bugs, problems, questions & feeback
Topic: decay isotopes burnup never included?
Replies: 4
Views: 5446

Re: decay isotopes burnup never included?

Hi, The decay isotopes (i.e. nuclides without xs data) are not normally included in the .bumat output that you get with "set printm 1". The decay nuclides can be added in the bumat output using set printm 1 <threshold> where <threshold> is the threshold atomic fraction above which decay nuclides are...
by Tuomas Viitanen
Wed Dec 16, 2015 5:43 pm
Forum: Input
Topic: Track-length detector
Replies: 4
Views: 4671

Re: Track-length detector

Hi again, Sorry for not paying attention to the dm part in the first place. You will have to remove also the "dm m10" to make the detector work properly (as indicated also in the error message). Thus, det 1301 dtl 701 should provide you the track-length estimate of the flux at the position of the de...
by Tuomas Viitanen
Wed Dec 16, 2015 12:22 pm
Forum: Input
Topic: Track-length detector
Replies: 4
Views: 4671

Re: Track-length detector

Dear Davide, Currently, the track-length detector can only be applied to detector surfaces (not detector cells). The detector can thus be defined det 1301 dtl <surface> such that the detector is scored within <surface>. In case the detector cannot be described by a simple surface, you can define mul...
by Tuomas Viitanen
Wed Dec 02, 2015 11:24 am
Forum: Input
Topic: New S(a,b) capabilities in Serpent 2.1.24
Replies: 6
Views: 5543

Re: New S(a,b) capabilities in Serpent 2.1.24

Hi, The naming conventions for the thermal scattering libraries included in the Serpent 1.1.7 distribution package can be found here (you can find essentially the same data also by looking at / grepping the .xsdata header files, which is usually faster): http://montecarlo.vtt.fi/download/SSS_THERMAL...
by Tuomas Viitanen
Wed Nov 18, 2015 11:14 am
Forum: Users
Topic: ENDF/B-VII version
Replies: 7
Views: 3018

Re: ENDF/B-VII version

I guess the answer is no, then.

Tuomas
by Tuomas Viitanen
Fri Aug 21, 2015 12:16 pm
Forum: Input
Topic: Shuffle option
Replies: 2
Views: 4005

Re: Shuffle option

Hi, The shuffling option is only available in Serpent 1 and a similar capability is not available in Serpent 2. However, fuel shuffling within a burnup calculation can be done also in Serpent 2 by using the restart feature, documented in http://ttuki.vtt.fi/serpent/viewtopic.php?f=24&t=2005&p=5916&h...
by Tuomas Viitanen
Fri Aug 14, 2015 1:07 pm
Forum: Bugs, problems, questions & feeback
Topic: Discrepancy of K-eff by different "opti" mode
Replies: 5
Views: 4561

Re: Discrepancy of K-eff by different "opti" mode

A solution to this issue is reported in

http://ttuki.vtt.fi/serpent/viewtopic.p ... b3c4#p6036

Thanks to Donny for reporting this problem!

Best regards,

Tuomas
by Tuomas Viitanen
Fri Aug 14, 2015 12:25 pm
Forum: Input
Topic: New S(a,b) capabilities in Serpent 2.1.24
Replies: 6
Views: 5543

Re: New S(a,b) capabilities in Serpent 2.1.24

The OTF S(a,b) interpolation capabilites can be fixed in optimization modes 1 and 3 by making the following changes in tmpmajorants.c: 1) Remove the following lines (near line 621) #ifdef DEBUG if(ne != (long)RDB[loc + REACTION_XS_NE] || i0 != (long)RDB[loc + REACTION_XS_I0]) Die(FUNCTION_NAME, "Ene...