diff --git a/src/reactor/fuel/sample.cpp b/src/reactor/fuel/sample.cpp
index 96a2619..bdc9402 100644
--- a/src/reactor/fuel/sample.cpp
+++ b/src/reactor/fuel/sample.cpp
@@ -66,7 +66,7 @@ void sample::update(double secs)
 	// sim::reactor::fuelulate fuel use
 	fuel -= neutrons_fuel;
 	energy += neutrons_fuel;
-	waste.add_fissile(neutrons_fuel * 5);
+	waste.add_fissile(neutrons_fuel * 6);
 
 	// do the poison
 	te_135 += neutrons_fuel * (1.0 / 8.0);
diff --git a/src/reactor/fuel/sample.hpp b/src/reactor/fuel/sample.hpp
index 4278319..6efc848 100644
--- a/src/reactor/fuel/sample.hpp
+++ b/src/reactor/fuel/sample.hpp
@@ -10,7 +10,7 @@ namespace sim::reactor::fuel
 
 class sample
 {
-	constexpr static const double Xe_135_M = 1e3;
+	constexpr static const double Xe_135_M = 1e4;
 
 	sim::reactor::fuel::waste waste;
 	
diff --git a/src/reactor/rod.cpp b/src/reactor/rod.cpp
index 6d2dfd4..7842167 100644
--- a/src/reactor/rod.cpp
+++ b/src/reactor/rod.cpp
@@ -17,7 +17,16 @@ void rod::add(val_t type, double v)
 
 double rod::extract(val_t type, double s, double k, double o)
 {
-	double v = (1 - std::pow(0.5, s * -std::log2(1 - k * get_k(type)))) * 0.5 * (get(type) - o);
+	k *= get_k(type);
+
+	double m = 1;
+
+	if(k < 1)
+	{
+		m = 1 - std::pow(0.5, s * -std::log2(1 - k * get_k(type)));
+	}
+	
+	double v = m * 0.5 * (get(type) - o);
 	vals_in[type] -= v;
 	return v;
 }