Search found 65 matches

by Tuomas Viitanen
Tue Nov 19, 2013 11:16 am
Forum: Methods
Topic: Evaluating XS at Different Temperatures
Replies: 2
Views: 7557

Re: Evaluating XS at Different Temperatures

Hi, The xsdirconvert.pl script reads the path for the ACE data files from the first line of the xsdir file, which should look something like this: datapath=/home/tuomas/xsdata/acedata/ If the datapath is not correctly set in the xsdir file, the script is unable to find the ACE files. Your problem wi...
by Tuomas Viitanen
Thu Nov 14, 2013 12:29 pm
Forum: Distribution
Topic: 0K cross section data in the base version
Replies: 4
Views: 10850

Re: 0K cross section data in the base version

Just like you said: You need to first generate (/obtain by other means) 0 K data and only after that you can use DBRC.

Tuomas
by Tuomas Viitanen
Tue Nov 12, 2013 1:38 pm
Forum: Distribution
Topic: 0K cross section data in the base version
Replies: 4
Views: 10850

Re: 0K cross section data in the base version

Hi, You managed to spot two problems in the Serpent 1.1.19 and manual in your post. Thank you for pointing them out :) - There seems to be an error in the Serpent manual: the cross sections that should be given to the set dbrc card are continuous-energy (.xxc) cross sections, not thermal scattering ...
by Tuomas Viitanen
Mon Nov 04, 2013 2:08 pm
Forum: Users
Topic: Serpent-compatible ACE libraries with NJOY
Replies: 30
Views: 10951

Re: Serpent-compatible ACE libraries with NJOY

The input seems ok to me, but it seemed ok also the time before the last error was found ;) I wouldn't worry about the small differences in the ACE outputs, they are probably due to small differences between NJOY versions and platforms, just like you said. You can also quite easily test if your libr...
by Tuomas Viitanen
Thu Oct 24, 2013 4:06 pm
Forum: Users
Topic: Serpent-compatible ACE libraries with NJOY
Replies: 30
Views: 10951

Re: Serpent-compatible ACE libraries with NJOY

Hi Andy, First of all, sorry about the errmax error in the documentation, it was my bad. Now the documentation should be fixed. I just noticed another error in the input. Unlike in many Monte Carlo codes, in NJOY the basic unit of energy is eV. Thus, the thnmax parameter should be 1E6 instead of 1. ...
by Tuomas Viitanen
Tue Oct 22, 2013 11:28 am
Forum: Users
Topic: Serpent-compatible ACE libraries with NJOY
Replies: 30
Views: 10951

Re: Serpent-compatible ACE libraries with NJOY

Hi, I just noticed that there is a small but in this case significant error in the NJOY parameter listing of sss_acelib117u.pdf. In this file it is said that the reconstruction tolerance parameters used in RECONR and BROADR modules are err = 0.01 errint = 5E-7 errmax = 0.01 As err = errmax, this wou...
by Tuomas Viitanen
Wed Mar 20, 2013 5:22 pm
Forum: Bug reports
Topic: (In)accuracy of the Serpent 1 cross section library
Replies: 0
Views: 3911

(In)accuracy of the Serpent 1 cross section library

Hello, While working with a HTGR test case that was used to test the new on-the-fly temperature treatment features, it was noticed that the standard Serpent cross section libraries are not accurate enough for reliable modeling of at least some HTGR systems. The examined system consists of an infinit...
by Tuomas Viitanen
Tue Jan 22, 2013 11:30 am
Forum: Methods
Topic: Fuel shuffling
Replies: 10
Views: 18177

Re: Fuel shuffling

Dear Rully, Serpent 1.1.18 indeed contains a simple fuel shuffling property. Two universes <uni1> and <uni2> can be interchanged within a burnup calculation using the command shuffle <uni1> <uni2> For example, if you have a very simple lattice 1 2 3 4 this irradiation history definition : dep dayste...
by Tuomas Viitanen
Wed Jan 02, 2013 2:26 pm
Forum: Bugs, problems, questions & feeback
Topic: "TMP" Option
Replies: 9
Views: 5805

Re: "TMP" Option

Here is an example of the input file I have used for 0 K libraries. moder 50 -51 reconr -51 -52 'Tape reconstructed from tape50, containing mat 9237'/ 9237 0/ 0.010000 0 0.100000 5.000000E-07/ 0/ broadr -51 -52 -53 9237 1/ 0.010000 1e6 0.100000 5.000000E-07 0.00 0/ gaspr -51 -53 -54 acer -51 -54 0 5...
by Tuomas Viitanen
Mon Dec 10, 2012 2:05 pm
Forum: Gamma transport
Topic: Libraries
Replies: 5
Views: 3160

Re: Libraries

Just a little clarification to my previous post: Any official "distribution package" won't be prepared before the next Serpent User Group Meeting, but it is possible that a new preliminary ACE library for Serpent 2 will be available at that meeting for beta testers. Since the ACE package will be hug...