Summary PresentationJEFFREY STACK Masters ProjectDecember December 2011

 Introduction  Problem Description  Methodology  Expected Results  Sizing of the Orifices  Numerical Solution for Orifice DP 2December 2011

 Reactor Coolant Pumps (RCPs) ◦ Provides Coolant to Reactor  Testing Requirements ◦ Flow/Head, NPSH, HPP  Challenges to Testing ◦ Conditions ◦ Very specific requirements  Net Positive Suction Head (NPSH) ◦ Very low test loop pressures 3December 2011

 Harsh Testing Conditions for all Components ◦ Pressure, Temperature, NPSH conditions  Cavitation in Restriction Orifice ◦ Large Δp & Large reduction in flow area  Task – Dual Orifice System Design ◦ To minimize flow area reduction  Hydraulic Design ◦ Includes analytical sizing of flow diameter & comparison with numerical results  Structural Design ◦ Includes static and dynamic analysis of the orifices 4December 2011

 Size Orifice & Determine Detailed Geometry ◦ Using Idelchick’s “Handbook of Hydraulic Resistance”  Comparison with Numerical Results ◦ Using COMSOL Multiphysics  Create 3D Model ◦ Using ANSYS Workbench  Perform Static Structural Analysis ◦ Using ANSYS Workbench by applying conservative results from the orifice sizing or numerical results  Perform Dynamic Structural Analysis ◦ Using ANSYS Workbench to determine orifice natural frequencies for comparison with typical RCP hydraulic pressure pulsations 5December 2011

 Using the required Δp of 663.5kPa to achieve the high flow point, Orifice 1 is sized using the following correlation from Idelchick  Where F o is the flow area of the orifice which is solved for  The inner diameter of Orifice 1 is determined to be 0.551m 6December 2011

 To determine the required Δp for Orifice 2, a new Δp of Orifice 1 is calculated for the low flow point  This new Orifice 1 Δp is subtracted from the total (Orifice 1 & 2 combined) Δp of kPa, which is required to achieve the low flow point  The Orifice 2 Δp is determined to be 890.4kPa  Using the correlation on the previous slide, the Orifice 2 inner diameter is determined to be 0.448m 7December 2011

 Model uses same inputs as analytical method ◦ Fluid properties & geometry  Auto-meshing function of COMSOL is used December 20118

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