From aa2447ccd11e9c878d1ef17d0f8fcc3a1afc00c1 Mon Sep 17 00:00:00 2001
From: Paul Romano <paul.k.romano@gmail.com>
Date: Wed, 15 Jul 2026 12:26:16 -0500
Subject: [PATCH] Update openmc/deplete/r2s.py per @GuySten suggestion

Co-authored-by: GuySten <62616591+GuySten@users.noreply.github.com>
---
 openmc/deplete/r2s.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/openmc/deplete/r2s.py b/openmc/deplete/r2s.py
index e04297d973..6c19531e7e 100644
--- a/openmc/deplete/r2s.py
+++ b/openmc/deplete/r2s.py
@@ -515,7 +515,7 @@ class R2SManager:
                     raise IndexError(
                         f'Photon time index {index} is out of range for '
                         f'{n_steps} depletion results')
-                normalized_index = index + n_steps if index < 0 else index
+                normalized_index = index % n_steps
                 normalized_indices.append(normalized_index)
 
             # Remove duplicates while preserving order