Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs
===================================================================
diff -u -r77b27109212e94d58eb47248d4210f7eac243fb6 -r25244fe94c640d8b0598ee52e355a320efb66512
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs	(.../PipingFailureMechanismResultViewTest.cs)	(revision 77b27109212e94d58eb47248d4210f7eac243fb6)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingFailureMechanismResultViewTest.cs	(.../PipingFailureMechanismResultViewTest.cs)	(revision 25244fe94c640d8b0598ee52e355a320efb66512)
@@ -343,6 +343,7 @@
         }
 
         [Test]
+        [SetCulture("nl-NL")]
         [TestCase(AssessmentLayerOneState.NotAssessed)]
         [TestCase(AssessmentLayerOneState.NoVerdict)]
         public void FailureMechanismResultView_AssessmentLayerTwoAHasValue_DoesNotShowsErrorTooltip(
@@ -370,7 +371,7 @@
 
                 // Assert
                 Assert.IsEmpty(dataGridViewCell.ErrorText);
-                Assert.AreEqual("1/980,908,719,666,769,000,000",
+                Assert.AreEqual("1/980.908.719.666.769.000.000",
                                 formattedValue);
             }
         }
Index: Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingScenariosViewTest.cs
===================================================================
diff -u -rdf44be36b5c375ff32cd94086af5e6610ec9fc3a -r25244fe94c640d8b0598ee52e355a320efb66512
--- Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingScenariosViewTest.cs	(.../PipingScenariosViewTest.cs)	(revision df44be36b5c375ff32cd94086af5e6610ec9fc3a)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Forms.Test/Views/PipingScenariosViewTest.cs	(.../PipingScenariosViewTest.cs)	(revision 25244fe94c640d8b0598ee52e355a320efb66512)
@@ -35,7 +35,6 @@
 using Ringtoets.Common.Data.Calculation;
 using Ringtoets.Common.Data.FailureMechanism;
 using Ringtoets.Common.Data.TestUtil;
-using Ringtoets.Common.Forms.Helpers;
 using Ringtoets.Piping.Data;
 using Ringtoets.Piping.Data.TestUtil;
 using Ringtoets.Piping.Forms.Views;
@@ -83,6 +82,7 @@
                 Assert.IsNull(pipingScenarioView.Data);
                 Assert.IsNull(pipingScenarioView.PipingFailureMechanism);
             }
+
             mocks.VerifyAll();
         }
 
@@ -212,6 +212,7 @@
         }
 
         [Test]
+        [SetCulture("nl-NL")]
         public void PipingScenarioView_CalculationsWithAllDataSet_DataGridViewCorrectlyInitialized()
         {
             // Setup & Call
@@ -238,10 +239,10 @@
             Assert.IsTrue(Convert.ToBoolean(cells[isRelevantColumnIndex].FormattedValue));
             Assert.AreEqual(100.ToString(CultureInfo.CurrentCulture), cells[contributionColumnIndex].FormattedValue);
             Assert.AreEqual("Calculation 2", cells[nameColumnIndex].FormattedValue);
-            Assert.AreEqual("1/980,908,719,666,769,000,000", cells[failureProbabilityPipingColumnIndex].FormattedValue);
-            Assert.AreEqual("1/204,463,909,053", cells[failureProbabilityUpliftColumnIndex].FormattedValue);
-            Assert.AreEqual("1/31,469,301", cells[failureProbabilityHeaveColumnIndex].FormattedValue);
-            Assert.AreEqual("1/980,908,719,666,769,000,000", cells[failureProbabilitySellmeijerColumnIndex].FormattedValue);
+            Assert.AreEqual("1/980.908.719.666.769.000.000", cells[failureProbabilityPipingColumnIndex].FormattedValue);
+            Assert.AreEqual("1/204.463.909.053", cells[failureProbabilityUpliftColumnIndex].FormattedValue);
+            Assert.AreEqual("1/31.469.301", cells[failureProbabilityHeaveColumnIndex].FormattedValue);
+            Assert.AreEqual("1/980.908.719.666.769.000.000", cells[failureProbabilitySellmeijerColumnIndex].FormattedValue);
         }
 
         [Test]
Index: Ringtoets/Piping/test/Ringtoets.Piping.Integration.Test/PipingFailureMechanismResultViewIntegrationTest.cs
===================================================================
diff -u -rdf44be36b5c375ff32cd94086af5e6610ec9fc3a -r25244fe94c640d8b0598ee52e355a320efb66512
--- Ringtoets/Piping/test/Ringtoets.Piping.Integration.Test/PipingFailureMechanismResultViewIntegrationTest.cs	(.../PipingFailureMechanismResultViewIntegrationTest.cs)	(revision df44be36b5c375ff32cd94086af5e6610ec9fc3a)
+++ Ringtoets/Piping/test/Ringtoets.Piping.Integration.Test/PipingFailureMechanismResultViewIntegrationTest.cs	(.../PipingFailureMechanismResultViewIntegrationTest.cs)	(revision 25244fe94c640d8b0598ee52e355a320efb66512)
@@ -42,6 +42,7 @@
         private const int assessmentLayerTwoAIndex = 2;
 
         [Test]
+        [SetCulture("nl-NL")]
         public void FailureMechanismResultView_DataImportedOrChanged_ChangesCorrectlyObservedAndSynced()
         {
             using (var form = new Form())
@@ -122,15 +123,15 @@
                 // Execute the first calculation and ensure the data grid view is updated
                 pipingCalculation1.Output = new TestPipingOutput();
                 pipingCalculation1.NotifyObservers();
-                Assert.AreEqual("1/980,908,719,666,769,000,000",
+                Assert.AreEqual("1/980.908.719.666.769.000.000",
                                 dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].FormattedValue);
                 Assert.IsEmpty(dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].ErrorText);
 
                 // Add another, nested calculation without surface line and ensure the data grid view is updated when the surface line is set
                 var pipingCalculation3 = new PipingCalculationScenario(new GeneralPipingInput());
                 nestedPipingCalculationGroup.Children.Add(pipingCalculation3);
                 nestedPipingCalculationGroup.NotifyObservers();
-                Assert.AreEqual("1/980,908,719,666,769,000,000",
+                Assert.AreEqual("1/980.908.719.666.769.000.000",
                                 dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].FormattedValue);
                 Assert.IsEmpty(dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].ErrorText);
 
@@ -164,7 +165,7 @@
                 // Set contribution again so we have a probability.
                 pipingCalculation1.Contribution = (RoundedDouble) 1.0;
                 pipingCalculation1.NotifyObservers();
-                Assert.AreEqual("1/980,908,719,666,769,000,000",
+                Assert.AreEqual("1/980.908.719.666.769.000.000",
                                 dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].FormattedValue);
                 Assert.IsEmpty(dataGridView.Rows[22].Cells[assessmentLayerTwoAIndex].ErrorText);