### Reading ACE data

Posted:

**Mon Sep 26, 2011 5:47 pm**Dear all,

I m trying to have SERPENT read an existing cross sections library (based on JEFF3.1 data w/ probability tables) in ACE format.

However, when I try to run SERPENT, I obtain the following error message:

=======================================

Reading data from ACE files:

Isotope 92235.31c (U-235)...

Isotope lwtr01.31t (H-1)...

Isotope 1001.31c (H-1)...

OK.

Reading energy arrays:

Isotope 92235.31c (U-235)...

Isotope lwtr01.31t (H-1)...

Isotope 1001.31c (H-1)...

OK.

- Main grid thinned from 77019 to 77019 points using tolerance 0.00E+00.

- 5839 important points added resulting in a total of 77019 points.

- Final grid size 76955 points (1.00E-11 < E < 20.0).

- Total 83 points in nubar grid.

- 4 energy groups in few-group structure.

Processing XS data:

Isotope 92235.31c (U-235)...

***** Mon Sep 26 16:30:37 2011 (seed = 1317047435)

Fatal error in function EnergyDistribution:

Unable to process E interpolation (mt 18)

Simulation aborted.

=====================================================

The xs data works fine on the same problem with MCNPX....

Did anybody have the same problem, if so, how did you solve it?

Thanks a lot,

Mathieu

I m trying to have SERPENT read an existing cross sections library (based on JEFF3.1 data w/ probability tables) in ACE format.

However, when I try to run SERPENT, I obtain the following error message:

=======================================

Reading data from ACE files:

Isotope 92235.31c (U-235)...

Isotope lwtr01.31t (H-1)...

Isotope 1001.31c (H-1)...

OK.

Reading energy arrays:

Isotope 92235.31c (U-235)...

Isotope lwtr01.31t (H-1)...

Isotope 1001.31c (H-1)...

OK.

- Main grid thinned from 77019 to 77019 points using tolerance 0.00E+00.

- 5839 important points added resulting in a total of 77019 points.

- Final grid size 76955 points (1.00E-11 < E < 20.0).

- Total 83 points in nubar grid.

- 4 energy groups in few-group structure.

Processing XS data:

Isotope 92235.31c (U-235)...

***** Mon Sep 26 16:30:37 2011 (seed = 1317047435)

Fatal error in function EnergyDistribution:

Unable to process E interpolation (mt 18)

Simulation aborted.

=====================================================

The xs data works fine on the same problem with MCNPX....

Did anybody have the same problem, if so, how did you solve it?

Thanks a lot,

Mathieu