From dccfb2e335c786da80a69bcf6b752a25afd647aa Mon Sep 17 00:00:00 2001
From: shimwell <mail@jshimwell.com>
Date: Mon, 6 Jul 2026 18:09:27 +0200
Subject: [PATCH 1/2] Add TENDL-2023 and TENDL-2025 releases to chain
 generation URL registry

Adds release entries for TENDL-2023 and TENDL-2025 to urls_chain.py and
the corresponding release choices to generate_tendl_chain, bringing the
chain registry to parity with urls.py. The 2023 tarball is named
TENDL-n.2024new.tgz; the 2025 tarball is TENDL-n.tgz. Both URLs were
verified live on the Imperial mirror.
---
 README.md                                         |  2 +-
 src/openmc_data/depletion/generate_tendl_chain.py |  6 +++---
 src/openmc_data/urls_chain.py                     | 12 ++++++++++++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 8529033..0b2f9ea 100644
--- a/README.md
+++ b/README.md
@@ -107,7 +107,7 @@ A few categories of scripts are available:
 |generate_endf_chain | ENDF/B | VII.1<br>VIII.0<br>VIII.1  |
 |generate_jeff_chain | JEFF | 3.3  |
 |generate_jendl_chain | JENDL | 5.0 |
-|generate_tendl_chain | TENDL | 2019<br>2021 |
+|generate_tendl_chain | TENDL | 2019<br>2021<br>2023<br>2025 |
 |generate_serpent_fissq | |  |
 |generate_endf71_chain_casl | ENDF/B |  |
 
diff --git a/src/openmc_data/depletion/generate_tendl_chain.py b/src/openmc_data/depletion/generate_tendl_chain.py
index da371a7..e9fbcc4 100755
--- a/src/openmc_data/depletion/generate_tendl_chain.py
+++ b/src/openmc_data/depletion/generate_tendl_chain.py
@@ -30,11 +30,11 @@
 parser.add_argument(
     "-r",
     "--release",
-    choices=["2015", "2017", "2019", "2021"],
+    choices=["2015", "2017", "2019", "2021", "2023", "2025"],
     default="2021",
     help="The nuclear data library release "
-    "version. The currently supported options are 2019, "
-    "and 2021.",
+    "version. The currently supported options are 2015, 2017, 2019, "
+    "2021, 2023, and 2025.",
 )
 parser.add_argument(
     "-d",
diff --git a/src/openmc_data/urls_chain.py b/src/openmc_data/urls_chain.py
index 1871cf7..5542092 100644
--- a/src/openmc_data/urls_chain.py
+++ b/src/openmc_data/urls_chain.py
@@ -83,6 +83,18 @@
                 'base_url': 'https://tendl.imperial.ac.uk/tendl_2021/tar_files/',
                 'compressed_files': ['TENDL-n.tgz'],
             }
+        },
+        '2023': {
+            'neutron':{
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2023/tar_files/',
+                'compressed_files': ['TENDL-n.2024new.tgz'],
+            }
+        },
+        '2025': {
+            'neutron':{
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2025/tar_files/',
+                'compressed_files': ['TENDL-n.tgz'],
+            }
         }
     },
     'jendl': {

From 30f79d090fa5210eaa65e01e79d67b3f65c867bd Mon Sep 17 00:00:00 2001
From: shimwell <mail@jshimwell.com>
Date: Mon, 6 Jul 2026 18:13:02 +0200
Subject: [PATCH 2/2] CI: run apt-get update before installing dependencies

The install steps called 'apt-get install libhdf5-serial-dev' against a
stale package index, causing intermittent 404s when a cached dependency
version (e.g. libcurl4-openssl-dev) was superseded and removed from the
mirror pool. Running 'apt-get update' first refreshes the index.
---
 .github/workflows/test_package.yml    | 1 +
 .github/workflows/test_processing.yml | 1 +
 .github/workflows/test_urls.yml       | 1 +
 3 files changed, 3 insertions(+)

diff --git a/.github/workflows/test_package.yml b/.github/workflows/test_package.yml
index a30c4bb..ce97485 100644
--- a/.github/workflows/test_package.yml
+++ b/.github/workflows/test_package.yml
@@ -29,6 +29,7 @@ jobs:
 
       - name: Install testing dependencies
         run: |
+          sudo apt-get update
           sudo apt-get install libhdf5-serial-dev
           git clone --single-branch --branch develop --depth 1 https://github.com/openmc-dev/openmc.git
           cd openmc
diff --git a/.github/workflows/test_processing.yml b/.github/workflows/test_processing.yml
index 44dc897..71d3605 100644
--- a/.github/workflows/test_processing.yml
+++ b/.github/workflows/test_processing.yml
@@ -45,6 +45,7 @@ jobs:
       - name: Install testing dependencies
         if: steps.changed-files-specific.outputs.any_changed == 'true'
         run: |
+          sudo apt-get update
           sudo apt-get install libhdf5-serial-dev
           git clone --single-branch --branch develop --depth 1 https://github.com/openmc-dev/openmc.git
           cd openmc
diff --git a/.github/workflows/test_urls.yml b/.github/workflows/test_urls.yml
index 50c2b45..2c5616a 100644
--- a/.github/workflows/test_urls.yml
+++ b/.github/workflows/test_urls.yml
@@ -31,6 +31,7 @@ jobs:
 
       - name: Install testing dependencies
         run: |
+          sudo apt-get update
           sudo apt-get install libhdf5-serial-dev
           git clone --single-branch --branch develop --depth 1 https://github.com/openmc-dev/openmc.git
           cd openmc