Index: Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismResultView.cs
===================================================================
diff -u -rf7a9f7239374705ff1d732e9666c0cb62ebaafd0 -rc02a37ac174a9c5a023b743d506969b8d593f0c7
--- Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismResultView.cs	(.../FailureMechanismResultView.cs)	(revision f7a9f7239374705ff1d732e9666c0cb62ebaafd0)
+++ Ringtoets/Common/src/Ringtoets.Common.Forms/Views/FailureMechanismResultView.cs	(.../FailureMechanismResultView.cs)	(revision c02a37ac174a9c5a023b743d506969b8d593f0c7)
@@ -379,8 +379,6 @@
 
                 dataGridView.Rows[e.RowIndex].Cells[e.ColumnIndex].ErrorText = string.Empty;
             }
-
-            
         }
 
         #endregion
Index: Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationGroupExtensions.cs
===================================================================
diff -u -r1279dcba187f56c0ba96dfdb962067304e333475 -rc02a37ac174a9c5a023b743d506969b8d593f0c7
--- Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationGroupExtensions.cs	(.../PipingCalculationGroupExtensions.cs)	(revision 1279dcba187f56c0ba96dfdb962067304e333475)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Data/PipingCalculationGroupExtensions.cs	(.../PipingCalculationGroupExtensions.cs)	(revision c02a37ac174a9c5a023b743d506969b8d593f0c7)
@@ -42,7 +42,8 @@
                 var lineSegments = Math2D.ConvertLinePointsToLineSegments(failureMechanismSectionResult.Section.Points);
                 var calculationScenarios = pipingCalculationGroup.GetPipingCalculations()
                                                                  .Where(pc => pc.IsSurfaceLineIntersectionWithReferenceLineInSection(lineSegments))
-                                                                 .Where(pc => pc.GetType() == typeof(PipingCalculationScenario)).ToList();
+                                                                 .Where(pc => pc.GetType() == typeof(PipingCalculationScenario))
+                                                                 .Where(pc => !failureMechanismSectionResult.CalculationScenarios.Contains(pc)).ToList();
 
                 if (calculationScenarios.Any())
                 {
Index: Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationGroupExtensionsTest.cs
===================================================================
diff -u -r0b081b2391e73b7e3ff04ef31fafd2df1b1571e3 -rc02a37ac174a9c5a023b743d506969b8d593f0c7
--- Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationGroupExtensionsTest.cs	(.../PipingCalculationGroupExtensionsTest.cs)	(revision 0b081b2391e73b7e3ff04ef31fafd2df1b1571e3)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Data.Test/PipingCalculationGroupExtensionsTest.cs	(.../PipingCalculationGroupExtensionsTest.cs)	(revision c02a37ac174a9c5a023b743d506969b8d593f0c7)
@@ -151,6 +151,43 @@
             CollectionAssert.IsEmpty(failureMechanism.SectionResults);
         }
 
+        [Test]
+        public void AddCalculationScenariosToFailureMechanismSectionResult_CalculationAlreadyInFailureMechanismSectionResul_ScenarioNotAddedToFailureMechanismSectionResult()
+        {
+            // Setup
+            var failureMechanism = GetFailureMechanismWithSections();
+
+            var calculationsStructure = PipingCalculationConfigurationHelper.GenerateCalculationsStructure(
+                failureMechanism.SurfaceLines,
+                failureMechanism.StochasticSoilModels,
+                failureMechanism.GeneralInput,
+                failureMechanism.SemiProbabilisticInput);
+
+            foreach (var item in calculationsStructure)
+            {
+                failureMechanism.CalculationsGroup.Children.Add(item);
+            }
+
+            failureMechanism.CalculationsGroup.AddCalculationScenariosToFailureMechanismSectionResult(failureMechanism);
+
+            // Precondition
+            var failureMechanismSectionResult1 = failureMechanism.SectionResults.First();
+            var failureMechanismSectionResult2 = failureMechanism.SectionResults.ElementAt(1);
+
+            Assert.AreEqual(4, failureMechanismSectionResult1.CalculationScenarios.Count);
+            Assert.AreEqual(2, failureMechanismSectionResult2.CalculationScenarios.Count);
+
+            // Call
+            failureMechanism.CalculationsGroup.AddCalculationScenariosToFailureMechanismSectionResult(failureMechanism);
+
+            // Assert
+            var failureMechanismSectionResult3 = failureMechanism.SectionResults.First();
+            var failureMechanismSectionResult4 = failureMechanism.SectionResults.ElementAt(1);
+
+            Assert.AreEqual(4, failureMechanismSectionResult3.CalculationScenarios.Count);
+            Assert.AreEqual(2, failureMechanismSectionResult4.CalculationScenarios.Count);
+        }
+
         private static PipingFailureMechanism GetFailureMechanismWithoutSections()
         {
             return GetFailureMechanism();