Index: Riskeer/Integration/src/Riskeer.Integration.IO/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter.cs
===================================================================
diff -u -r059bf9fe80a0264abb9f033ef99a2e57a981fcff -ree2a193cd93696d64c8a43ccd2faaa50ad1a64fe
--- Riskeer/Integration/src/Riskeer.Integration.IO/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter.cs	(.../HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter.cs)	(revision 059bf9fe80a0264abb9f033ef99a2e57a981fcff)
+++ Riskeer/Integration/src/Riskeer.Integration.IO/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter.cs	(.../HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter.cs)	(revision ee2a193cd93696d64c8a43ccd2faaa50ad1a64fe)
@@ -71,27 +71,40 @@
 
         public bool Export()
         {
+            var exportedCalculations = new Dictionary<HydraulicBoundaryLocationCalculationsForTargetProbability, string>();
             return locationCalculationsForTargetProbabilities.All(
                 locationCalculationsForTargetProbability => ExportLocationCalculationsForTargetProbability(
-                    locationCalculationsForTargetProbability.Item1,locationCalculationsForTargetProbability.Item2));
+                    locationCalculationsForTargetProbability.Item1,
+                    locationCalculationsForTargetProbability.Item2,
+                    exportedCalculations));
         }
 
         private bool ExportLocationCalculationsForTargetProbability(
             HydraulicBoundaryLocationCalculationsForTargetProbability calculationsForTargetProbability,
-            HydraulicBoundaryLocationCalculationsType calculationsType)
+            HydraulicBoundaryLocationCalculationsType calculationsType,
+            IDictionary<HydraulicBoundaryLocationCalculationsForTargetProbability, string> exportedCalculations)
         {
             string exportType = calculationsType == HydraulicBoundaryLocationCalculationsType.WaterLevel
                                     ? Resources.HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter_WaterLevels_DisplayName
                                     : Resources.HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter_WaveHeights_DisplayName;
 
-            var fileName = $"{exportType}_{ReturnPeriodFormattingHelper.FormatFromProbability(calculationsForTargetProbability.TargetProbability)}";
-            string filePath = Path.Combine(folderPath, $"{fileName}.shp");
+            string uniqueName = NamingHelper.GetUniqueName(
+                exportedCalculations, $"{exportType}_{ReturnPeriodFormattingHelper.FormatFromProbability(calculationsForTargetProbability.TargetProbability)}",
+                c => c.Value);
 
+            string filePath = Path.Combine(folderPath, $"{uniqueName}.shp");
+
             var exporter = new HydraulicBoundaryLocationCalculationsExporter(
                 calculationsForTargetProbability.HydraulicBoundaryLocationCalculations,
                 filePath, calculationsType);
 
-            return exporter.Export();
+            if (!exporter.Export())
+            {
+                return false;
+            }
+
+            exportedCalculations.Add(calculationsForTargetProbability, uniqueName);
+            return true;
         }
     }
 }
\ No newline at end of file
Index: Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest.cs
===================================================================
diff -u -r3178fe8b6ae605b67d9b4dec9d73e36b8aa8c4d5 -ree2a193cd93696d64c8a43ccd2faaa50ad1a64fe
--- Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest.cs	(.../HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest.cs)	(revision 3178fe8b6ae605b67d9b4dec9d73e36b8aa8c4d5)
+++ Riskeer/Integration/test/Riskeer.Integration.IO.Test/Exporters/HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest.cs	(.../HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest.cs)	(revision ee2a193cd93696d64c8a43ccd2faaa50ad1a64fe)
@@ -45,7 +45,7 @@
             var exception = Assert.Throws<ArgumentNullException>(Call);
             Assert.AreEqual("locationCalculationsForTargetProbabilities", exception.ParamName);
         }
-        
+
         [Test]
         [TestCase(null)]
         [TestCase("")]
@@ -61,7 +61,7 @@
             // Assert
             Assert.Throws<ArgumentException>(Call);
         }
-        
+
         [Test]
         public void Constructor_ExpectedValues()
         {
@@ -91,7 +91,7 @@
             var exporter = new HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter(targetProbabilities, folderPath);
 
             string expectedFilePath = Path.Combine(folderPath, "Waterstanden_10.shp");
-            
+
             try
             {
                 using (new DirectoryPermissionsRevoker(folderPath, FileSystemRights.Write))
@@ -121,7 +121,7 @@
             Directory.CreateDirectory(folderPath);
 
             var random = new Random(21);
-            
+
             var targetProbabilities = new[]
             {
                 new Tuple<HydraulicBoundaryLocationCalculationsForTargetProbability, HydraulicBoundaryLocationCalculationsType>(
@@ -134,27 +134,77 @@
 
             var exporter = new HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter(targetProbabilities, folderPath);
 
-            string[] expectedFilePaths = 
+            string[] expectedFilePaths =
             {
                 Path.Combine(folderPath, $"Waterstanden_{GetReturnPeriodText(targetProbabilities.First().Item1.TargetProbability)}.shp"),
                 Path.Combine(folderPath, $"Golfhoogten_{GetReturnPeriodText(targetProbabilities.Last().Item1.TargetProbability)}.shp")
             };
-            
+
             try
             {
-                    // Call
-                    bool isExported = exporter.Export();
+                // Call
+                bool isExported = exporter.Export();
 
-                    // Assert
-                    Assert.IsTrue(isExported);
-                    Assert.IsTrue(expectedFilePaths.All(File.Exists));
+                // Assert
+                Assert.IsTrue(isExported);
+                Assert.IsTrue(expectedFilePaths.All(File.Exists));
             }
             finally
             {
                 Directory.Delete(folderPath, true);
             }
         }
 
+        [Test]
+        public void Export_WithDoubleHydraulicBoundaryLocationCalculationsForTargetProbabilities_WritesFilesAndReturnsTrue()
+        {
+            // Setup
+            string folderPath = TestHelper.GetScratchPadPath($"{nameof(HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporterTest)}.{nameof(Export_WithDoubleHydraulicBoundaryLocationCalculationsForTargetProbabilities_WritesFilesAndReturnsTrue)}");
+            Directory.CreateDirectory(folderPath);
+
+            var random = new Random(21);
+
+            var targetProbabilities = new[]
+            {
+                new Tuple<HydraulicBoundaryLocationCalculationsForTargetProbability, HydraulicBoundaryLocationCalculationsType>(
+                    new HydraulicBoundaryLocationCalculationsForTargetProbability(0.1),
+                    HydraulicBoundaryLocationCalculationsType.WaterLevel),
+                new Tuple<HydraulicBoundaryLocationCalculationsForTargetProbability, HydraulicBoundaryLocationCalculationsType>(
+                    new HydraulicBoundaryLocationCalculationsForTargetProbability(0.1),
+                    HydraulicBoundaryLocationCalculationsType.WaterLevel),
+                new Tuple<HydraulicBoundaryLocationCalculationsForTargetProbability, HydraulicBoundaryLocationCalculationsType>(
+                    new HydraulicBoundaryLocationCalculationsForTargetProbability(0.001),
+                    HydraulicBoundaryLocationCalculationsType.WaveHeight),
+                new Tuple<HydraulicBoundaryLocationCalculationsForTargetProbability, HydraulicBoundaryLocationCalculationsType>(
+                    new HydraulicBoundaryLocationCalculationsForTargetProbability(0.001),
+                    HydraulicBoundaryLocationCalculationsType.WaveHeight)
+            };
+
+            var exporter = new HydraulicBoundaryLocationCalculationsForTargetProbabilitiesExporter(targetProbabilities, folderPath);
+
+            string[] expectedFilePaths =
+            {
+                Path.Combine(folderPath, "Waterstanden_10.shp"),
+                Path.Combine(folderPath, "Waterstanden_10 (1).shp"),
+                Path.Combine(folderPath, "Golfhoogten_1.000.shp"),
+                Path.Combine(folderPath, "Golfhoogten_1.000 (1).shp")
+            };
+
+            try
+            {
+                // Call
+                bool isExported = exporter.Export();
+
+                // Assert
+                Assert.IsTrue(isExported);
+                Assert.IsTrue(expectedFilePaths.All(File.Exists));
+            }
+            finally
+            {
+                Directory.Delete(folderPath, true);
+            }
+        }
+
         private static string GetReturnPeriodText(double targetProbability)
         {
             return ReturnPeriodFormattingHelper.FormatFromProbability(targetProbability);