Index: Riskeer/Common/src/Riskeer.Common.IO/FileImporters/FailureMechanismSectionUpdateStrategy.cs
===================================================================
diff -u -re2d6afdc4d53c7502d16e9bfdb661ba25886e07c -r07b289eb269b6bf8e59e04f928fcb8b4a794bc17
--- Riskeer/Common/src/Riskeer.Common.IO/FileImporters/FailureMechanismSectionUpdateStrategy.cs	(.../FailureMechanismSectionUpdateStrategy.cs)	(revision e2d6afdc4d53c7502d16e9bfdb661ba25886e07c)
+++ Riskeer/Common/src/Riskeer.Common.IO/FileImporters/FailureMechanismSectionUpdateStrategy.cs	(.../FailureMechanismSectionUpdateStrategy.cs)	(revision 07b289eb269b6bf8e59e04f928fcb8b4a794bc17)
@@ -98,7 +98,7 @@
             }
         }
 
-        public void DoPostUpdateActions()
+        public virtual void DoPostUpdateActions()
         {
             // Do nothing
         }
Index: Riskeer/Piping/src/Riskeer.Piping.Plugin/FileImporter/PipingFailureMechanismSectionUpdateStrategy.cs
===================================================================
diff -u -r41c45fc63fee8f2b180a8f847f9702443d91685f -r07b289eb269b6bf8e59e04f928fcb8b4a794bc17
--- Riskeer/Piping/src/Riskeer.Piping.Plugin/FileImporter/PipingFailureMechanismSectionUpdateStrategy.cs	(.../PipingFailureMechanismSectionUpdateStrategy.cs)	(revision 41c45fc63fee8f2b180a8f847f9702443d91685f)
+++ Riskeer/Piping/src/Riskeer.Piping.Plugin/FileImporter/PipingFailureMechanismSectionUpdateStrategy.cs	(.../PipingFailureMechanismSectionUpdateStrategy.cs)	(revision 07b289eb269b6bf8e59e04f928fcb8b4a794bc17)
@@ -20,8 +20,11 @@
 // All rights reserved.
 
 using System;
+using System.Collections.Generic;
+using Core.Common.Base;
 using Riskeer.Common.IO.FileImporters;
 using Riskeer.Piping.Data;
+using Riskeer.Piping.Service;
 
 namespace Riskeer.Piping.Plugin.FileImporter
 {
@@ -31,6 +34,8 @@
     /// </summary>
     public class PipingFailureMechanismSectionUpdateStrategy : FailureMechanismSectionUpdateStrategy<PipingFailureMechanismSectionResult>
     {
+        private readonly PipingFailureMechanism failureMechanism;
+
         /// <summary>
         /// Creates a new instance of <see cref="PipingFailureMechanismSectionUpdateStrategy"/>.
         /// </summary>
@@ -41,6 +46,19 @@
         public PipingFailureMechanismSectionUpdateStrategy(
             PipingFailureMechanism failureMechanism,
             PipingFailureMechanismSectionResultUpdateStrategy sectionResultUpdateStrategy)
-            : base(failureMechanism, sectionResultUpdateStrategy) {}
+            : base(failureMechanism, sectionResultUpdateStrategy)
+        {
+            this.failureMechanism = failureMechanism;
+        }
+
+        public override void DoPostUpdateActions()
+        {
+            IEnumerable<IObservable> affectedObjects = PipingDataSynchronizationService.ClearAllProbabilisticCalculationOutput(failureMechanism);
+
+            foreach (IObservable affectedObject in affectedObjects)
+            {
+                affectedObject.NotifyObservers();
+            }
+        }
     }
 }
\ No newline at end of file
Index: Riskeer/Piping/test/Riskeer.Piping.Plugin.Test/FileImporter/PipingFailureMechanismSectionUpdateStrategyTest.cs
===================================================================
diff -u -r41c45fc63fee8f2b180a8f847f9702443d91685f -r07b289eb269b6bf8e59e04f928fcb8b4a794bc17
--- Riskeer/Piping/test/Riskeer.Piping.Plugin.Test/FileImporter/PipingFailureMechanismSectionUpdateStrategyTest.cs	(.../PipingFailureMechanismSectionUpdateStrategyTest.cs)	(revision 41c45fc63fee8f2b180a8f847f9702443d91685f)
+++ Riskeer/Piping/test/Riskeer.Piping.Plugin.Test/FileImporter/PipingFailureMechanismSectionUpdateStrategyTest.cs	(.../PipingFailureMechanismSectionUpdateStrategyTest.cs)	(revision 07b289eb269b6bf8e59e04f928fcb8b4a794bc17)
@@ -19,9 +19,15 @@
 // Stichting Deltares and remain full property of Stichting Deltares at all times.
 // All rights reserved.
 
+using System.Linq;
+using Core.Common.Base;
+using Core.Common.Util.Extensions;
 using NUnit.Framework;
+using Rhino.Mocks;
 using Riskeer.Common.IO.FileImporters;
 using Riskeer.Piping.Data;
+using Riskeer.Piping.Data.Probabilistic;
+using Riskeer.Piping.Data.TestUtil;
 using Riskeer.Piping.Plugin.FileImporter;
 
 namespace Riskeer.Piping.Plugin.Test.FileImporter
@@ -33,10 +39,46 @@
         public void Constructor_ExpectedValues()
         {
             // Call
-            var updateStrategy = new PipingFailureMechanismSectionUpdateStrategy(new PipingFailureMechanism(), new PipingFailureMechanismSectionResultUpdateStrategy());
+            var updateStrategy = new PipingFailureMechanismSectionUpdateStrategy(
+                new PipingFailureMechanism(), new PipingFailureMechanismSectionResultUpdateStrategy());
 
             // Assert
             Assert.IsInstanceOf<FailureMechanismSectionUpdateStrategy<PipingFailureMechanismSectionResult>>(updateStrategy);
         }
+
+        [Test]
+        public void DoPostUpdateActions_Always_ClearsOutputAndNotifiesObservers()
+        {
+            // Setup
+            var mocks = new MockRepository();
+            var observer = mocks.StrictMock<IObserver>();
+            observer.Expect(o => o.UpdateObserver()).Repeat.Twice();
+            mocks.ReplayAll();
+
+            var failureMechanism = new PipingFailureMechanism();
+            failureMechanism.CalculationsGroup.Children.AddRange(new[]
+            {
+                new ProbabilisticPipingCalculationScenario
+                {
+                    Output = PipingTestDataGenerator.GetRandomProbabilisticPipingOutputWithIllustrationPoints()
+                },
+                new ProbabilisticPipingCalculationScenario
+                {
+                    Output = PipingTestDataGenerator.GetRandomProbabilisticPipingOutputWithoutIllustrationPoints()
+                },
+                new ProbabilisticPipingCalculationScenario()
+            });
+
+            failureMechanism.Calculations.ForEachElementDo(c => c.Attach(observer));
+
+            var replaceStrategy = new PipingFailureMechanismSectionUpdateStrategy(failureMechanism, new PipingFailureMechanismSectionResultUpdateStrategy());
+
+            // Call
+            replaceStrategy.DoPostUpdateActions();
+
+            // Assert
+            Assert.IsTrue(failureMechanism.Calculations.All(c => !c.HasOutput));
+            mocks.VerifyAll();
+        }
     }
 }
\ No newline at end of file