Summary PresentationJEFFREY STACK Masters ProjectDecember December 2011

 Introduction  Problem Description  Methodology  Expected Results  Sizing of the Orifices 2December 2011

 Reactor Coolant Pumps (RCPs) ◦ Function  Testing Requirements ◦ Characteristics that are tested  Challenges to Testing ◦ Conditions ◦ Very specific requirements  Net Positive Suction Head ◦ Very low pump suction pressures 3December 2011

 Harsh Testing Conditions for all Components ◦ In particular, NPSH testing 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 sizing and any flow specific geometries  Structural Design ◦ Includes static and dynamic analysis of the orifices 4December 2011

 Size Orifice & Determine Detailed Geometry ◦ Using Idelchick’s “Handbook of Hydraulic Resistance”  Create 3D Model ◦ Using ANSYS Workbench  Perform Static Structural Analysis ◦ Using ANSYS Workbench by applying the Δp on the front face of the orifice  Perform Dynamic Structural Analysis ◦ Using ANSYS Workbench to determine orifice natural frequencies 5December 2011

 Two Orifice System Minimizing Cavitation  Orifice System to be Capable of Testing at 2 Flow Points by Removal of One Orifice  Structurally Sound for all Testing Conditions  Natural Frequency not to Overlap Typical Pump Blade Passing Frequencies 6December 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 7December 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 8December 2011