Search found 65 matches

by Tuomas Viitanen
Wed Aug 12, 2015 4:30 pm
Forum: Input
Topic: New S(a,b) capabilities in Serpent 2.1.24
Replies: 6
Views: 6988

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

The new S(a,b) capabilities provide consistent results only in optimization modes 2 and 4 in Serpent 2.1.24. This issue will hopefully be fixed in the next update.

Tuomas
by Tuomas Viitanen
Wed Aug 12, 2015 4:29 pm
Forum: Bugs, problems, questions & feeback
Topic: Discrepancy of K-eff by different "opti" mode
Replies: 5
Views: 5752

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

There is a bug in the new on-the-fly S(a,b) interpolation capability that I was unable to find in my test calculations.

The new capability is working correctly only in optimization modes 2 and 4. I'm looking for a way to get it working also in optimization modes 1 and 3.

Tuomas
by Tuomas Viitanen
Tue Aug 11, 2015 5:10 pm
Forum: Bugs, problems, questions & feeback
Topic: Discrepancy of K-eff by different "opti" mode
Replies: 5
Views: 5752

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

Hi, This problem seems awkwardly familiar to me: I experienced similar problems just before making the last fixes to the TMS routines for the 2.1.24 update. In fact, TMS did not work correctly in the lower optimization modes in many of the previous updates, but those problems should have been fixed ...
by Tuomas Viitanen
Thu Aug 06, 2015 12:40 pm
Forum: Bugs, problems, questions & feeback
Topic: Memory Error using S(a,b) treatment
Replies: 1
Views: 4449

Re: Memory Error using S(a,b) treatment

Hi, This is a bug, which is related to using the same S(a,b) data for two different nuclides, in this case 6000.09c and 6000.12c. The bug can be fixed by adding an if-condition near line 282 of addsabdata.c /* Allocate value pairs for first item */ /* (some comments in Finnish here :) */ if((long)RD...
by Tuomas Viitanen
Thu Aug 06, 2015 9:57 am
Forum: Input
Topic: New S(a,b) capabilities in Serpent 2.1.24
Replies: 6
Views: 6988

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

Hi, I looked more thoroughly the output from various calculations with S(a,b) data involved and it seems that the warning message is given always when using the new OTF S(a,b) methodology. I had somehow missed that warning when testing the new capability. With the new capability the CheckNuclideData...
by Tuomas Viitanen
Mon Jun 08, 2015 4:43 pm
Forum: Input
Topic: New S(a,b) capabilities in Serpent 2.1.24
Replies: 6
Views: 6988

New S(a,b) capabilities in Serpent 2.1.24

Dear Serpent users, The next Serpent update 2.1.24, which will be released in a couple of weeks, includes new capabilities for interpolating S(alpha,beta) data between temperatures. The S(a,b) data is required for accurate modelling of thermal scattering from bound atoms like H in water or C in grap...
by Tuomas Viitanen
Wed Apr 29, 2015 10:47 am
Forum: Methods
Topic: effect of temperatures
Replies: 1
Views: 6743

Re: effect of temperatures

Dear Milan, First of all, the most detailed, yet somewhat incomplete, version of the manual is available at the front page of the Serpent website http://montecarlo.vtt.fi Some additional information on the very newest features can also be found on this discussion forum. When it comes to treating tem...
by Tuomas Viitanen
Fri Apr 24, 2015 4:20 pm
Forum: Input
Topic: Temperature feedback in Serpent 2
Replies: 7
Views: 6148

Re: Temperature feedback in Serpent 2

Hi, I tried the TFB property and also got the "TMS flag is set" error with two different versions of Serpent: 2.1.23 and 2.1.14. After removing all "tmp" cards that I had accidentally forgotten in the input file, these errors disappeared. If you (xixipang) have not yet found the cause for the error,...
by Tuomas Viitanen
Tue Jan 27, 2015 5:31 pm
Forum: Bug reports
Topic: Error in the probability table treatment of Serpent 1
Replies: 0
Views: 4218

Error in the probability table treatment of Serpent 1

Hi all! In the last Serpent UGM in Cambridge we heard rumors that Serpent does not fully agree with MCNP in some calculations with fast systems. I think the error source has now been found, but unfortunately a fix will not be provided for the Serpent 1 code, at least yet. The bug is related to the r...
by Tuomas Viitanen
Tue Jan 27, 2015 5:15 pm
Forum: Bugs, problems, questions & feeback
Topic: Temperature-related error in the probability table treatment
Replies: 0
Views: 3956

Temperature-related error in the probability table treatment

Hi all! In the last Serpent UGM in Cambridge we heard rumors that Serpent does not fully agree with MCNP in some calculations with fast systems. I think the error source has now been found. The bug is related to the random number (re)sampling in the probability table treatment for the unresolved res...