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1 Application of the Performance Validation Tool for the Evaluation of NSSS Control System Performance Sohn Suk-Whun
2 1 Pre-Op Dynamic Test 2 Test Results 3 Pre-PAT Dynamic Test 4 Conclusion IAEA IAEA Conference
3 1 Pre-Op Dynamic Test IAEA IAEA Conference Conference
4 OPR1 NSSS Control System Composition SBCS SG Press. Control TBV RRS T AVG Control CEA Group PPCS PZR Press. Control Spray Valve, Heaters FWCS SG Level Control DFWCV, EFWCV, MFWP Speed RPCS Rapid Rx Power Reduction CEA Group 5 or 4+5, TCV Dormant error can cause the reactor trip. Experience : YGN 5&6 Startup Period (Changed Hardware) PLCS PZR Level Control Charging Valve, Letdown Isolation Valve OPR1 : Optimized Power Reactor 1MW NSSS : Nuclear Steam Supply System SBCS : Steam Bypass Control System FWCS : Feedwater Control System RRS : Reactor Regulating System PPCS : Preaaurizer Pressure Control System PLCS : Pressurizer Level Control System 4
5 Tests during Startup NPPs under Construction We experienced a reactor trip in this stage due to an error in control system caused by programmer s oversight (YGN 5&6) Commercial Operation PAT Dynamic Test FAT : Factory Acceptance Test Pre-op : Pre-operational PAT : Power Ascension Test Pre-Op Test Static Test (Plant Site) FAT Static Test (Factory) Design/ Fabrication (V&V Methodology) 5
6 Tests (Hardware Replacement) Operating NPPs Commercial Operation Skip Power Ascension Test Potential Risk of Real Plant Testing Economical Loss : Reduction of Electricity Production Pre-op Dynamic Test Dynamic Test FAT : Factory Acceptance Test Pre-op : Pre-operational PAT : Power Ascension Test Pre-Op Test Static Test (Plant Site) FAT Static Test (Factory) Design/ Fabrication (V&V Methodology) 6
7 Synopsis of Pre-op Dynamic Test Hardware Functional Test Design Spec. New Control System Hardware Performance Validation Test PAT Simulation Computer Code () Modeling PAT Simulation Operability Test Old Control System Hardware PAT Simulation 7
8 Performance Validation Test Computer Code Modeling of Control System according to Design Spec. Compare the results After bypass its own control system, it connect with replaced H/W Sensor Signal (Control System) Component Control Signal 8
9 Synopsis of Pre-op Dynamic Test Hardware Functional Test Design Spec. New Control System Hardware Performance Validation Test PAT Simulation Computer Code () Modeling PAT Simulation Operability Test Old Control System Hardware PAT Simulation 9
10 Operability Test Sensor Signal (Control System) Component Control Signal Compare the results Sensor Signal (Control System) Component Control Signal 1
11 Configuration of Test Equipment Signal Interface Module 11
12 2 Test Results IAEA IAEA Conference Conference
13 Selection of Test Cases Load Rejection to House Load Loss of a Main Feedwater Pump Reactor Trip Turbine Power 1% Step Decrease (1 to 9%) Turbine Power 5%/min Ramp Decrease (1 to 3%) Valve Transfer (Increasing Direction, 2%) Valve Transfer (Decreasing Direction, 18%) 13
14 YGN 3&4 Test Result (1/6) Load Rejection to House Load (Performance Validation Test) SG 1 NR Level, % FW1 Flow DP, % SG 1 Steam Flow DP, % SG 1 pressure, psia
15 YGN 3&4 Test Result (2/6) Load Rejection to House Load (Operability Test) FOXBORO (Old) TRICONEX (New) 8 FOXBORO (Old) TRICONEX (New) SG 1 NR Level, % FW1 Flow DP, % SG 1 Steam Flow DP, % FOXBORO (Old) TRICONEX (New) SG 1 pressure, psia FOXBORO (Old) TRICONEX (New)
16 YGN 3&4 Test Result (3/6) Loss of a Main Feedwater Pump (Performance Validation Test) SG 1 NR Level, % FW1 Flow DP, % SG 1 Steam Flow DP, % SG 1 pressure, psia
17 YGN 3&4 Test Result (4/6) Loss of a Main Feedwater Pump (Operability Test) FOXBORO (Old) TRICONEX (New) 8 FOXBORO (Old) TRICONEX (New) SG 1 NR Level, % 6 4 FW1 Flow DP, % SG 1 Steam Flow DP, % FOXBORO (Old) TRICONEX (New) SG 1 pressure, psia FOXBORO (Old) TRICONEX (New)
18 YGN 3&4 Test Result (5/6) Reactor Trip (Fail Case) : PI Controller Option Related Error 1 7 SG 1 NR Level, % DFWCV 1 Position Demand, % FW1 Flow DP, % 6 4 FW1 Flow DP, % Enlargement 18
19 YGN 3&4 Test Result (6/6) Reactor Trip (Success Case) 1 1 SG 1 NR Level, % DFWCV 1 Position Demand, % Average Temperature, Deg.F Pressurizer Pressure, psia
20 3 Pre-PAT Dynamic Test IAEA IAEA Conference Conference
21 Suggest of Pre-PAT Dynamic Test NPPs under Construction Pre-PAT Dynamic Test Commercial Operation PAT Dynamic Test FAT : Factory Acceptance Test Pre-op : Pre-operational PAT : Power Ascension Test Pre-Op Test Static Test (Plant Site) FAT Static Test (Factory) Design/ Fabrication (V&V Methodology) 21
22 Individual Test including Component FW Flow Stm Flow SG Level Rx Power Reactor Power AFW PC Main Steam MFWPs Speed Demand FWCS 6" 8" M M 8" HO HO Chemical Injection PC Isolation 6" Steam Generator 1 8" HO HO 2" 2" 18" 16" PC 12" Feedwater Steam Generator 2 BOP PCS RCS(cold) RCS(hot) BOP : Balance of Plant PCS : Plant Computer System FWCS : Feedwater Control System 22
23 Integrated Test SG Level Stm Flow FW Flow FWCS MFWP Speed Demand DFWCV EFWCV Permissive Stm HDR Press. SBCS Quick Open Modulation TBV A/D D/A PZR Press. PPCS Spray Valve PZR Level PLCS CCV TLI Hot Leg Temp. Rx Power RRS AMI, AWP AMI, AWP CEA Direction, Rate CEDMCS Cold Leg Temp. FWCS : Feedwater Control System SBCS : Steam Bypass Control System PPCS : Pressurizer Pressure Control System PLCS : Pressurizer Level Control System RRS : Reactor Regulating System RPCS : Reactor Power Cutback System TCS : Turbine Control System DFWCV : Downcomer Feedwater Control Valve EFWCV : Economizer Feedwater Control Valve TBV : Turbine Bypass Valve AMI : Automatic Motion Inhibit AWP : Automatic Withdrawal Prohibit RPCS Arm, Drop TBN Load Increase Inhibit TBN Setback TBN Runback TCS DAQ 23
24 4 Conclusion IAEA IAEA Conference Conference
25 Conclusion We develop the new tool to validate the performance of control and monitoring system. The tool showed a greater performance than expected. (We found the lots of error during YGN 3&4 Project) We try to expand the scope of tool to the NPPs under construction. (Pre-PAT Dynamic Test) We changed the name of our engineering simulator from win-npa to N-Fast. -FAST NSSS Fast Analysis and Simulat iontool 25
26
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