Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs
===================================================================
diff -u -rc7c07db38829afdc5965c331844e1d39123944ff -r8323c6cbe3f292646a254938161e17c42d13d10c
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs	(.../PipingCalculationScenarioTest.cs)	(revision c7c07db38829afdc5965c331844e1d39123944ff)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationScenarioTest.cs	(.../PipingCalculationScenarioTest.cs)	(revision 8323c6cbe3f292646a254938161e17c42d13d10c)
@@ -41,7 +41,8 @@
             Assert.IsInstanceOf<PipingCalculation>(scenario);
             Assert.AreSame(semiProbabilisticInputParameters, scenario.SemiProbabilisticParameters);
             Assert.IsTrue(scenario.IsRelevant);
-            Assert.AreEqual(new RoundedDouble(0, 0), scenario.Contribution);
+            Assert.AreEqual(new RoundedDouble(0), scenario.Contribution);
+            Assert.IsNaN(scenario.Probability);
         }
 
         [Test]
@@ -81,5 +82,40 @@
             // Assert
             Assert.AreEqual(roundedDouble, scenario.Contribution);
         }
+
+        [Test]
+        public void Probability_PipingOutputSet_ReturnsPipingOutputProbability()
+        {
+            // Setup
+            RoundedDouble expectedProbability = new RoundedDouble(0, 49862180);
+
+            var generalInputParameters = new GeneralPipingInput();
+            var semiProbabilisticInputParameters = new SemiProbabilisticPipingInput();
+
+            var scenario =  new PipingCalculationScenario(generalInputParameters, semiProbabilisticInputParameters);
+            scenario.SemiProbabilisticOutput = new PipingSemiProbabilisticOutput(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, expectedProbability, 0, 0);
+            
+            // Call
+            var probability = scenario.Probability;
+
+            // Assert
+            Assert.AreEqual(expectedProbability, probability);
+        }
+
+        [Test]
+        public void Probability_PipingOutputNull_ReturnsNaN()
+        {
+            // Setup
+            var generalInputParameters = new GeneralPipingInput();
+            var semiProbabilisticInputParameters = new SemiProbabilisticPipingInput();
+
+            var scenario = new PipingCalculationScenario(generalInputParameters, semiProbabilisticInputParameters);
+
+            // Call
+            var propability = scenario.Probability;
+
+            // Assert
+            Assert.IsNaN(propability);
+        }
     }
-}
+}
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