From 29eee7f5f469cce5bfa7691e0f20b87a4b369e7d Mon Sep 17 00:00:00 2001
From: Jon Shimwell <mail@jshimwell.com>
Date: Wed, 11 Jun 2025 16:29:10 +0200
Subject: [PATCH 1/2] fns chain is tendl not endf

---
 README.md                                     |  2 +-
 pyproject.toml                                |  2 +-
 ...wnload_endf_chain.py => download_chain.py} | 25 +++++++++++++------
 src/openmc_data/urls_xml.py                   |  4 +++
 4 files changed, 23 insertions(+), 10 deletions(-)
 rename src/openmc_data/download/{download_endf_chain.py => download_chain.py} (64%)

diff --git a/README.md b/README.md
index db2d2be..78b921b 100644
--- a/README.md
+++ b/README.md
@@ -114,7 +114,7 @@ A few categories of scripts are available:
 
 | Script name | Library | Release | Branching options|
 |-|-|-|-|
-|download_endf_chain | ENDF/B | VII.1<br>VIII.0 | None<br>SFR<br>PWR
+|download_chain | ENDF/B<br><br><br>TENDL | VII.1<br>VIII.0<br><br>2019 | None<br>SFR<br>PWR<br><br>FNS |
 
 <!-- | Sctipt name | Library | Release | Download available | Download ENDF files and generates XML chain files |
 |-|-|-|-|-|
diff --git a/pyproject.toml b/pyproject.toml
index 60e32d8..01a7eb7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -77,4 +77,4 @@ reduce_chain = "openmc_data.depletion.reduce_chain:main"
 
 download_endf = "openmc_data.download.download_endf:main"
 download_tendl = "openmc_data.download.download_tendl:main"
-download_endf_chain = "openmc_data.download.download_endf_chain:main"
+download_chain = "openmc_data.download.download_chain:main"
diff --git a/src/openmc_data/download/download_endf_chain.py b/src/openmc_data/download/download_chain.py
similarity index 64%
rename from src/openmc_data/download/download_endf_chain.py
rename to src/openmc_data/download/download_chain.py
index 82ab5c8..35ec7ab 100644
--- a/src/openmc_data/download/download_endf_chain.py
+++ b/src/openmc_data/download/download_chain.py
@@ -37,20 +37,30 @@ class CustomFormatter(
 parser.add_argument(
     "-r",
     "--release",
-    choices=["b7.1", "b8.0"],
-    default="b8.0",
+    choices=["b7.1", "b8.0", "2019"],
+    default="2019",
     help="The nuclear data library release version. The currently supported "
          "options are b7.1 and b8.0.",
 )
+parser.add_argument(
+    "-l",
+    "--library",
+    choices=["endf", "tendl"],
+    default="tendl",
+    help="The nuclear data library. The currently supported options are endf and tendl",
+)
 parser.add_argument(
     "-b",
     "--branching_ratios",
     choices=["None", "SFR", "PWR", "FNS"],
     default="FNS",
     help="The nuclear data library release version. The currently supported "
-         "options are b7.1 and b8.0 with branching ratio options of None, SFR "
-         "(sodium fast reactor), PWR (pressurized water reactor) or FNS "
-         "(fusion neutron source)",
+         "options are endf b7.1 and b8.0 with branching ratio options of None, "
+         "SFR (sodium fast reactor), PWR (pressurized water reactor) or tendl "
+         "2019 with FNS (fusion neutron source) branching ratio. The tendl "
+         "chains are processed with neutron induced fission yields from"
+         "ENDF/B-VIII.0. There is an option to use JEFF 3.3 if you generate"
+         "your own chain file with the generate_tendl_chain command line tool.",
 )
 
 parser.set_defaults()
@@ -59,11 +69,10 @@ class CustomFormatter(
 
 def main():
 
-    library_name = 'endf'
-    details = all_chain_release_details[library_name][args.release][args.branching_ratios]["chain"]
+    details = all_chain_release_details[args.library][args.release][args.branching_ratios]["chain"]
 
     if args.filename is None:
-        args.filename = Path("-".join(["chain", library_name, args.release])+".xml")
+        args.filename = Path("-".join(["chain", args.library, args.release])+".xml")
         print(f'Using default filename {args.filename}')
 
     download(
diff --git a/src/openmc_data/urls_xml.py b/src/openmc_data/urls_xml.py
index 8063daf..47e5877 100644
--- a/src/openmc_data/urls_xml.py
+++ b/src/openmc_data/urls_xml.py
@@ -33,6 +33,10 @@
                     "url": "https://github.com/openmc-data-storage/openmc_data/raw/main/src/openmc_data/depletion/chain_endf_b8.0_pwr.xml"
                 }
             },
+        }
+    },
+    "tendl": {
+        "2019": {
             "FNS": {
                 "chain": {
                     "url": "https://github.com/jbae11/openmc_activator/raw/refs/heads/main/fns_spectrum.chain.xml"

From e9a8e10fac1d90cd41e776c04301da4f91c352e4 Mon Sep 17 00:00:00 2001
From: Jon Shimwell <mail@jshimwell.com>
Date: Wed, 11 Jun 2025 16:38:18 +0200
Subject: [PATCH 2/2] updated file name and cmd args

---
 .github/workflows/test_package.yml    |  2 +-
 .github/workflows/test_processing.yml | 23 ++++++++++++-----------
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/.github/workflows/test_package.yml b/.github/workflows/test_package.yml
index 3697e75..a30c4bb 100644
--- a/.github/workflows/test_package.yml
+++ b/.github/workflows/test_package.yml
@@ -69,7 +69,7 @@ jobs:
 
       - name: Test download chain files scripts exist
         run: |
-          download_endf_chain --help
+          download_chain --help
    
       - name: Test other scripts exist
         run: |
diff --git a/.github/workflows/test_processing.yml b/.github/workflows/test_processing.yml
index 788560d..2ade1b7 100644
--- a/.github/workflows/test_processing.yml
+++ b/.github/workflows/test_processing.yml
@@ -112,22 +112,23 @@ jobs:
           download_tendl -r 2019
           download_tendl -r 2021
 
-      - name: test default download_endf_chain
-        if: contains(steps.changed-files-specific.outputs.modified_files, 'src/openmc_data/download/download_endf_chain.py')
+      - name: test default download_chain
+        if: contains(steps.changed-files-specific.outputs.modified_files, 'src/openmc_data/download/download_chain.py')
         run: |
-          echo "download_endf_chain.py file has been modified."
-          download_endf_chain -r b7.1 -b None
-          download_endf_chain -r b8.0 -b None
-          download_endf_chain -r b7.1 -b SFR
-          download_endf_chain -r b8.0 -b SFR
-          download_endf_chain -r b7.1 -b PWR
-          download_endf_chain -r b8.0 -b PWR
+          echo "download_chain.py file has been modified."
+          download_chain -l endf -r b7.1 -b None
+          download_chain -l endf -r b8.0 -b None
+          download_chain -l endf -r b7.1 -b SFR
+          download_chain -l endf -r b8.0 -b SFR
+          download_chain -l endf -r b7.1 -b PWR
+          download_chain -l endf -r b8.0 -b PWR
+          download_chain -l endf -r b8.0 -b PWR
 
       - name: test default add_branching_ratios
         if: contains(steps.changed-files-specific.outputs.modified_files, 'src/openmc_data/depletion/add_branching_ratios.py')
         run: |
           echo "add_branching_ratios.py file has been modified."
-          download_endf_chain -r b8.0
+          download_chain -l endf -r b8.0
           add_branching_ratios -i chain-endf-b8.0.xml -o chain_endf_b8.0_sfr.xml -b sfr
           add_branching_ratios -i chain-endf-b8.0.xml -o chain_endf_b8.0_pwr.xml -b pwr
 
@@ -135,5 +136,5 @@ jobs:
         if: contains(steps.changed-files-specific.outputs.modified_files, 'src/openmc_data/depletion/reduce_chain.py')
         run: |
           echo "reduce_chain.py file has been modified."
-          download_endf_chain -r b8.0
+          download_chain -l endf -r b8.0
           reduce_chain -i chain-endf-b8.0.xml -o chain_endf_b8.0_sfr.xml -hl 1e15