Search found 381 matches

by Ville Valtavirta
Thu Jul 04, 2019 11:33 am
Forum: Bugs, problems, questions & feeback
Topic: Bugs in version 2.1.31
Replies: 13
Views: 1335

Re: Bugs in version 2.1.31

A bug related to custom perturbations has been identified in Serpent 2.1.31, which results in custom perturbations always having zero output sensitivity. Fixing this bug requires modifying the scoreperturbations.c file. The following variable initialization needs to be added in the beginning of the ...
by Ville Valtavirta
Thu Jul 04, 2019 11:27 am
Forum: Users
Topic: XGPT warning: GetSensEventType
Replies: 4
Views: 378

Re: XGPT warning: GetSensEventType

Hi, sounds interesting. The reaction rate ratio (detector ratio) uncertainties in 2.1.31 do include the direct effect in several cases. See: -The relevant section in Serpent wiki . -This report: http://montecarlo.vtt.fi/download/VTT-R-04681-18_web.pdf] . As for the warning for complex reactions (in ...
by Ville Valtavirta
Thu Jul 04, 2019 11:11 am
Forum: Users
Topic: Cuboidal Lattice (type 11) Syntax
Replies: 13
Views: 1799

Re: Cuboidal Lattice (type 11) Syntax

Hi, the sanity check limits for the lattice size seem to be quite small. See this earlier post on how to increase it. Basically, you'll have to modify the input value checks at lines 3851-3861 of readinput.c: /* Lattice size */ nx = (long)TestParam(pname, fname, line, params[j++], PTYPE_INT, 1, 100)...
by Ville Valtavirta
Tue Jul 02, 2019 2:13 pm
Forum: Users
Topic: Where to get KERMA data
Replies: 15
Views: 1324

Re: Where to get KERMA data

Hi, as far as I can tell, the bins are: Total energy deposition. Local fission energy deposition (excluding components transported away from fission site by tracked particles). Direct energy deposition by neutrons (e.g. due to scattering or capture). Direct energy deposition by photons. -Ville
by Ville Valtavirta
Wed Jun 19, 2019 1:31 pm
Forum: Users
Topic: Power produced in successive simulations with updated geometry for transient simulations.
Replies: 7
Views: 755

Re: Power produced in successive simulations with updated geometry for transient simulations.

Hi Robert, I don't think it's generally possible to combine a time-independent k-eigenvalue calculation with point kinetics to get any kind of an accurate solution for the space and time kinetic neutron transport problem. The k-eigenvalue (criticality source) calculation assumes, for example that th...
by Ville Valtavirta
Wed Jun 19, 2019 10:56 am
Forum: Bugs, problems, questions & feeback
Topic: power output fluctuations in coupled simulation
Replies: 3
Views: 405

Re: power output fluctuations in coupled simulation

Hi Dan, decreasing the density of the fuel material via the multi-physics interface currently does not do anything to the local precursor concentrations. It will affect the precursor production rates via the decrease in the macroscopic fission cross section, but precursors produced in the past This ...
by Ville Valtavirta
Mon Jun 10, 2019 1:22 pm
Forum: Users
Topic: Direct Energy deposition
Replies: 10
Views: 1283

Re: Direct Energy deposition

Hi,

are you actually simulating photons in your calculation? See: set ngamma.

-Ville
by Ville Valtavirta
Wed May 29, 2019 9:23 am
Forum: Users
Topic: 2D HTTR with Hexagonal Lattice
Replies: 2
Views: 473

Re: 2D HTTR with Hexagonal Lattice

Hi, as far as I see, It isn't possible to use hexagonal surface to set reflective axial boundary conditions with black radial boundary conditions. You can either have all boundaries be black or have them all be reflective. You could use your first approach, i.e. to change surface 665 to cylz and sur...
by Ville Valtavirta
Tue May 28, 2019 2:53 pm
Forum: Users
Topic: Hydrogen in Zirconium Hydride and Water with S(a,b) for IFC
Replies: 11
Views: 1034

Re: Hydrogen in Zirconium Hydride and Water with S(a,b) for IFC

Checking a bit further, everything actually seems to be OK. The problem was with me. The output lines Nuclide 1001.03s TMS majorant to 470K... Nuclide 1001.03s TMS majorant to 470K... may seem a bit strange, but inside Serpent everything is working in a reasonable manner. The short explanation is th...