## Several question regarding to boundary condition and S(a,b)

Questions and discussion about applications, input, output and general user topics

### Several question regarding to boundary condition and S(a,b)

I have two question for the code:

1. For the boundary condition

I saw in the manual, it says I can define bc at x y and z direction.

But what I want is difference bc at +x -x +y -y +z -z.

For example, I only want reflective at -y , +z, and -z.

Is Serpent able to do this? Because I don't see it in the manual.

2. For the S(a,b) card

Is there any document that can explain which one is refer to what things?

Like lwj3.00t --> this is refer to 294 K's condition.

I found the .xsdata file in the cross section directory, but the comment is not much in the file.

Is it possible to prepare an extra document explain all of these cross-section library's information? just like what MCNP provided in the Vol. 1 (the table for all the cross-section).

Thanks!
j0937065063

Posts: 7
Joined: Mon Apr 03, 2017 4:53 pm
Location: Arlington, Virginia, US

### Re: Several question regarding to boundary condition and S(a,b)

1) No, The same boundary condition is applied on both the positive and the negative side.

2) The temperature is given by the 7th column of the directory file:

Code: Select all
`   lwe7.00t   lwe7.00t  3      0  0    1.007825  294  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.02t   lwe7.02t  3      0  0    1.007825  350  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.04t   lwe7.04t  3      0  0    1.007825  400  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.06t   lwe7.06t  3      0  0    1.007825  450  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.08t   lwe7.08t  3      0  0    1.007825  500  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.10t   lwe7.10t  3      0  0    1.007825  550  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.12t   lwe7.12t  3      0  0    1.007825  600  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.14t   lwe7.14t  3      0  0    1.007825  650  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1   lwe7.18t   lwe7.18t  3      0  0    1.007825  800  0  /home/projle/xsdata/Serpent_1.1.7/data/sssth1`
- Jaakko

Jaakko Leppänen

Posts: 1836
Joined: Thu Mar 18, 2010 10:43 pm
Location: Espoo, Finland

### Re: Several question regarding to boundary condition and S(a,b)

Hello Jaakko

Thanks for the reply.

For the S(a,b) correction, for example, lwe7.00t and lwj2.00t, they are all 294 K.

But what is the difference? e refer to endf?

There is not much explanation on these cross-section data files.

Is it possible to make another document explain these thing?

Thanks a lot!
j0937065063

Posts: 7
Joined: Mon Apr 03, 2017 4:53 pm
Location: Arlington, Virginia, US

### Re: Several question regarding to boundary condition and S(a,b)

The 00t libraries are all approximately at the same temperature. e7 refers to ENDF/B-VII, j2 to JEF-2.2, etc. You can find documentation about the cross section libraries at Serpent website: http://montecarlo.vtt.fi/links.htm
- Jaakko

Jaakko Leppänen