From 91278e8bcb1b3e2b4c5244d29ba5ba7577e08d86 Mon Sep 17 00:00:00 2001
From: Chris Keckler <ckeckler@terrapower.com>
Date: Fri, 23 Dec 2022 16:32:12 -0800
Subject: [PATCH] Simplify calcs in `Material.density3()`

---
 armi/materials/material.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/armi/materials/material.py b/armi/materials/material.py
index 03fb5712b2..282c4cf05d 100644
--- a/armi/materials/material.py
+++ b/armi/materials/material.py
@@ -412,8 +412,7 @@ def density3(self, Tk: float = None, Tc: float = None) -> float:
             )
             return None
         f = (1.0 + dLL / 100.0) ** 3
-        dRhoOverRho = (1.0 - f) / f
-        return refD * (dRhoOverRho + 1)
+        return refD / f
 
     def density3KgM3(self, Tk: float = None, Tc: float = None) -> float:
         """Return density that preserves mass when thermally expanded in 3D in units of kg/m^3.