Index: Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs
===================================================================
diff -u -rde8e5c0dd97c9e53a07e905a0f59617e570b2259 -rfcc734ebbc1e5c6c02ae2dae2a184fdcb9aa4d1b
--- Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs	(.../PipingSemiProbabilisticCalculationService.cs)	(revision de8e5c0dd97c9e53a07e905a0f59617e570b2259)
+++ Ringtoets/Piping/src/Ringtoets.Piping.Service/PipingSemiProbabilisticCalculationService.cs	(.../PipingSemiProbabilisticCalculationService.cs)	(revision fcc734ebbc1e5c6c02ae2dae2a184fdcb9aa4d1b)
@@ -65,8 +65,11 @@
         /// </summary>
         /// <param name="calculation">The calculation which is used as input for the semi-probabilistic assessment. If the semi-
         /// probabilistic calculation is successful, <see cref="PipingCalculation.SemiProbabilisticOutput"/> is set.</param>
+        /// <param name="norm">The return period to assess for.</param>
+        /// <param name="contribution">The contribution of piping as a percentage (0-100) to the total of the failure probability of the
+        /// assessment section.</param>
         /// <exception cref="ArgumentException">Thrown when calculation has no output from a piping calculation.</exception>
-        public static void Calculate(PipingCalculation calculation)
+        public static void Calculate(PipingCalculation calculation, int norm, double contribution)
         {
             ValidateOutputOnCalculation(calculation);
 
@@ -77,11 +80,11 @@
                 pipingOutput.UpliftFactorOfSafety,
                 pipingOutput.HeaveFactorOfSafety,
                 pipingOutput.SellmeijerFactorOfSafety,
-                pipingProbabilityAssessmentInput.Norm,
+                norm,
                 pipingProbabilityAssessmentInput.A,
                 pipingProbabilityAssessmentInput.B,
                 pipingProbabilityAssessmentInput.SectionLength,
-                pipingProbabilityAssessmentInput.Contribution/100);
+                contribution/100);
 
             calculator.Calculate();