Wedge shape in KENOVI does not accept Z-boundary conditions

[Jackson]

Hello all,

When using a wedge as a boundary for a case, if I specify either of the Z boundaries, the case fails with the error:

  ***** error ***** triton message nmbr tr-054 follows:

a surface number 6 was specified that is larger than number of surfaces in the indicated global body.

the problem will not be run.

*******

The cases run if the Z-boundaries are either undefined, or all boundaries are defined with 'all='. Is there a special way that the Z-boundaries need to be defined? To follow on to this, what does KENOIV default to for undefined boundaries?

Thank,

Jackson

[Rike Bostelmann]

Hi Jackson,

For a wedge, you can define boundary conditions only for 5 surfaces. This is why you get the "surface number 6" error message.

Table 8.1.18 in the SCALE manual provides the albedo surfaces related to the KENO-VI geometry bodies. Here is an example for a wedge that has reflective boundary conditions in both z-directions, and vacuum in all other directions:

     read bounds

       surface(1)=vacuum surface(2)=vacuum surface(3)=vacuum surface(4)=mirror surface(5)=mirror

     end bounds

I recommend checking the boundary conditions in SCALE's output file. The box providing "additional information" about the KENO calculation would show for the above example:

                 ***  boundary label 500               wedge                                                     ***

                 ***                                                                                             ***

                 ***    surface(1 )                    vacuum         surface( 2 )                     vacuum    ***

                 ***                                                                                             ***

                 ***    surface(3 )                    vacuum         surface( 4 )                     reflect   ***

                 ***                                                                                             ***

                 ***    surface(5 )                    reflect                                                   ***

                 ***                                                                                             ***

In this way, you can check if your settings were accepted and also which defaults are applied in case you didn't explicitly state the conditions. The default for all boundaries in KENO-VI is vacuum. But please always double-check the output.

Thanks,

Rike

SCALE Team