Update input_recycle.xml

[OHTAESUK]

Adjusted input_recycle.xml tutorial file. See the following descriptions:

ㅁ Added missing fresh_mox recipe and enabled ALWR reactor to accept MOX fuel
ㅁ Corrected FuelFab fissile commodity name (separated-fissile → separated_fissile)
ㅁ Increased fissile buffer in Separations (5 t → 50 t) to avoid early stall
ㅁ Removed leftover buffer limit to ensure continuous waste handling
ㅁ Adjusted FuelFab inventories and throughput (fill 94 t, fissile 6 t, throughput 100 t) → to keep MOX fabrication aligned with available Pu and reactor demand (The MOX fuel has Pu content ~ 9%)
ㅁ These numerical changes are not required for file validity, but improve mass-flow stability and yield more interpretable recycle behavior.

Summary of Changes

Design Notes

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• API for Cyclus modules
• Input files
• Output tables for post processing tools

Related CEPs and Issues

Fixes #

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• I have added or updated relevant tests
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[gonuke]

Thanks for this contribution @OHTAESUK !

Can I ask you to explain the changes in the description. Some of them are obvious:

• adding the mox recipe
• enabling the reactor to accept mox

But some of the buffer sizes and throughput values that are changing are less obvious. I'm not sure if they are necessary for this file to work, or just provide more interesting results?

[OHTAESUK]

Dear Professor Wilson @gonuke

I have adjusted the comments to provide further details about the change in the input tutorial XML file.
Thank you.

[gonuke]

This XML file is the result of individual steps in the tutorial pages that you may also have followed. It would be great to also PR changes to those pages to ensure that the tutorials themselves match this final file. You can find the markdown (technically is ReStructuredText) for these web pages in /source/user/tutorial of this repository.

I see a note that the tutorial intentionally did NOT include a recipe for fresh MOX because it wanted the fuel fab to use the equivalence method to make fresh MOX that was neutronically as similar to fresh UOX as possible. We should discuss whether we want to change this? I'm not sure which of your other changes are related to this?

[gonuke]

A comment about the need for a MOX recipe, and we should discuss how to finalize this PR if you are still interested.

[gonuke]

It turns out that this was intentional in this example/tutorial. There is a footnote about this here (https://fuelcycle.org/user/tutorial/mod_rxtr.html).

Since the fuel fabrication facility's model is to blend the input streams to find a reactor physics equivalent to the requested fuel recipe, the purpose of this tutorial is to have that facility produce MOX fuel that is the best possible match to the UOX recipe.