1. PRC - Primary Reactor Coolant System Primary coolant circuit Interfaces with PRH, PSGs, RCPs, PPZ, PVC, PCS, and PPS

2. System Volumes – Loop 1 PRH Lower Plenum Upper Plenum Down comer Cold Leg 1A Cold Leg 1B Hot Leg 1 PPZ Surge line PSG 1 PRP 1A PRP 1B Spray line

3. System Volumes – Loop 2 PRH Lower Plenum Upper Plenum Down comer Cold Leg 2A Cold Leg 2B Hot Leg 2 PSG 2 PRP 2A PRP 2B

4. Variable NameVariable DescriptionUnitsDimensionalitySource Component Sink Component Display Notes PRC_i_UPlenum_Inlet_Mass Flow Mass flow rate of primary coolant into upper plenum kg/secScalar (1x)PRHPRCNot visible PRC_i_UPlenum_Inlet_Entha lpy Enthalpy of primary coolant into upper plenum J/kgScalar (1x)PRHPRCNot visible PRC_i_UPlenum_Inlet_TempTemperature of primary coolant into upper plenum CC Scalar (1x)PRHPRCNot visible PRC_j_UPlenum_Outlet_Mas sFlow Mass flow rate of primary coolant out of upper plenum into hot leg j kg/secScalar (1x)PRC Not visible PRC_j_UPlenum_Outlet_Ent halpy Enthalpy of primary coolant out of upper plenum into hot leg j J/kgScalar (1x)PRC Not visible PRC_j_UPlenum_Outlet_Te mp Temperature of primary coolant out of upper plenum into hot leg j °CScalar (1x)PRC Not visible PRC_j_HotLeg_Outlet_MassF low Mass flow rate of primary coolant out of hot leg kg/secScalar (1x)PRCPSGNot visible PRC_j_HotLeg_Outlet_Enthal py Enthalpy of primary coolant out of hot leg J/kgScalar (1x)PRCPSGNot visible PRC_j_HotLeg_Outlet_TempTemperature of primary coolant out of hot leg °CScalar (1x)PRCPSGVisible

5. Variable NameVariable DescriptionUnitsDimensionalitySource Component Sink Component Display Notes Scalar (1x)Visible Scalar (1x)Not visible Scalar (1x)Visible Scalar (1x)Visible Scalar (1x)Visible Scalar (1x)Not visible Scalar (1x)Not visible Scalar (1x)Visible Scalar (1x)Visible Scalar (1x)Visible Scalar (1x)Not visible Scalar (1x)Not visible

6. Variable NameVariable DescriptionUnitsDimensionalitySource Component Sink Component Display Notes PRC_i_Makeup_MassFlowMass flow rate of makeup flow into SG outlet kg/secScalar (1x)BoundaryPSGVisible PRC_i_Makeup_EnthalpyEnthalpy of makeup flow into SG outlet J/kgScalar (1x)BoundaryPSGNot visible PRC_i_Makeup_TempTemperature of makeup flow into SG outlet °CScalar (1x)BoundaryPSGNot visible

7. ALPHA VERSION GUI

8. Comments on Alpha Version GUI Surge line should go to bottom of pressurizer, not top Needs to show spray lines from cold legs going to common header and then into top of pressurizer Surge line comes off hot leg 1 RCPs should be labeled Cold legs and RCPs numbering should be 1A, 1B, 2A, 2B per AP1000 convention PRC plots should include pressure, temperature, and flow for each leg