Search found 559 matches

by Ana Jambrina
Wed Oct 20, 2021 8:02 pm
Forum: Methods
Topic: fatal error
Replies: 13
Views: 55

Re: fatal error

Just to be clear, what kind of library mix is in place?
by Ana Jambrina
Wed Oct 20, 2021 7:48 pm
Forum: Methods
Topic: fatal error
Replies: 13
Views: 55

Re: fatal error

Which S(a,b) data are you using?
by Ana Jambrina
Wed Oct 20, 2021 7:38 pm
Forum: Methods
Topic: fatal error
Replies: 13
Views: 55

Re: fatal error

The error corresponds to a sanity check for the emission energy, E in [1e-15, 1e-5] - S(a,b), inelastic, continuous distribution in the 'processedistribution.c' routine.
Which cross section data are you using? Could you post here the full input?
by Ana Jambrina
Wed Oct 20, 2021 6:34 pm
Forum: Users
Topic: depmtx output
Replies: 7
Views: 62

Re: depmtx output

For reprocessing systems, the output also includes the target nuclides involved in the reprocessing event. - Check the topic: viewtopic.php?f=18&t=3617.
Note: it might help to go the MSR burnup source routines (in particular, check the for-loops and the indexing).
by Ana Jambrina
Wed Oct 20, 2021 4:19 pm
Forum: Bugs, problems, questions & feeback
Topic: Problem with "dep acttot"
Replies: 4
Views: 23

Re: Problem with "dep acttot"

I understood you were using the previous calculation as a source. The restart capability doesn't necessarily imply setting up a source. You can restart a calculation from a previous burnup point, taking from it the depleted material compositions. Have you checked the fissile mass of the system?
by Ana Jambrina
Wed Oct 20, 2021 3:30 pm
Forum: Bugs, problems, questions & feeback
Topic: Problem with "dep acttot"
Replies: 4
Views: 23

Re: Problem with "dep acttot"

The error arises when Serpent evaluates the normalization coefficients for the reaction rates. In the case of power and power density normalization, if the fission production rate is zero, coefficient’s denominator - the system doesn’t produce any fission power (due to the fissile content), Serpent ...
by Ana Jambrina
Tue Oct 19, 2021 4:27 pm
Forum: Input
Topic: Problem with multiple universes XS generation
Replies: 10
Views: 110

Re: Problem with multiple universes XS generation

Aren't you looking at common universes among axial slices and radially disperse? Those universes can be, later, (directly) used for the group constant generation.
by Ana Jambrina
Tue Oct 19, 2021 3:28 pm
Forum: Users
Topic: decay heat after shutdown
Replies: 1
Views: 39

Re: decay heat after shutdown

To model a non-irradiated period, you could either directly use a decay step, skipping the neutron transport calculation, or explicitly perform a burnup calculation with zero power. However, if you aim to obtain some detector output from that step, you should set a burnup step with very low power, e...
by Ana Jambrina
Tue Oct 19, 2021 2:50 pm
Forum: Input
Topic: Problem with multiple universes XS generation
Replies: 10
Views: 110

Re: Problem with multiple universes XS generation

E.g., have you checked the stack lattice definition ('lat' - type 9: vertical stack)? - you could discretize the geometry axially defining radial planes with the homogenized-universes (lattices) and stack them to build the model.
by Ana Jambrina
Mon Oct 18, 2021 1:15 pm
Forum: Input
Topic: Problem with multiple universes XS generation
Replies: 10
Views: 110

Re: Problem with multiple universes XS generation

Your description, as you are aware of, ends in overlapping cell-universes. You might want to try building an intermediate layer that deals with the axial heterogeneity and, ultimately, fill the root universe with it, such as, e.g., stacking lattices vertically or universe-based copy parts of the geo...