- #1
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Discussion Overview
The discussion revolves around the meaning of the number 0.62 in the context of MCNP, specifically whether it refers to water density at high temperature or something else related to material libraries.
Discussion Character
- Technical explanation
- Debate/contested
Main Points Raised
- One participant questions whether 0.62 refers to the water density at high temperature.
- Another participant asserts that 0.62 is the name of the library, specifically lwtr.62t, which is a S(a,b) library for Hydrogen in Light Water at 500 K.
- A third participant suggests that to find a list of materials and temperatures, one should refer to "Appendix G" of the MCNP manual, noting discrepancies in temperature references between versions of the code.
- This participant mentions that lwtr.62t refers to 600 K in an older version of "Appendix G" but states that in their version, it refers to 500 K.
- A later reply references a document that confirms lwtr.62t refers to 500 K, expressing confusion over the conflicting temperature information.
Areas of Agreement / Disagreement
Participants express differing views on the temperature associated with lwtr.62t, with some stating it refers to 500 K and others suggesting it may refer to 600 K in older documentation. The discussion remains unresolved regarding the exact meaning of the number 0.62.
Contextual Notes
There are limitations regarding the version of the MCNP code being discussed, as well as potential discrepancies in the documentation across different versions, which may affect the interpretation of the number 0.62.
- #2
PSRB191921
- 188
- 94
Hi,
it is the name of the library,
lwtr.62t is a S(a,b) library for Hydrogen in Light Water :
endf 6.3 ; 500 K
it is the name of the library,
lwtr.62t is a S(a,b) library for Hydrogen in Light Water :
endf 6.3 ; 500 K
- #3
rpp
- 110
- 78
To find a list of materials and temperatures, you need to look in "Appendix G" of the MCNP manual for the version of the code you are using.
I don't know what version of the code you are using, but lwtr.62t is from ENDF/B 6.3 (1993).
This is pretty old, I would use version 7 or possibly 8.
Looking at an older version of "Appendix G", lwtr.62t refers to 600 K
https://mcnp.lanl.gov/pdf_files/la-ur-03-1987g_sab.pdf
Looking at the version of Appendix G distributed with my version (LA-UR-17-20709), lwtr.62 refers to 500 K.
You need to look at the documentation distributed with your library.
I don't know what version of the code you are using, but lwtr.62t is from ENDF/B 6.3 (1993).
This is pretty old, I would use version 7 or possibly 8.
Looking at an older version of "Appendix G", lwtr.62t refers to 600 K
https://mcnp.lanl.gov/pdf_files/la-ur-03-1987g_sab.pdf
Looking at the version of Appendix G distributed with my version (LA-UR-17-20709), lwtr.62 refers to 500 K.
You need to look at the documentation distributed with your library.
- #4
PSRB191921
- 188
- 94
Looking to Conlin, Jeremy Lloyd. Listing of Available ACE Data Tables. United States: N. p., 2017.
https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-20709
lwtr.62t refers to 500 K not 600 K
strange ...
https://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-20709
lwtr.62t refers to 500 K not 600 K
strange ...
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