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1、1,April 25 29CHICAGO,ILLINOISE,USA,PHYSOR2004 International Meeting,Application of The Dynamic Control rod Reactivity Method To Korea Standard Nuclear Power Plants,KEPRI/E.K.LEE,2,Contents,INTRODUCTION(BACKGROUND&OBJECTS)DCRM METHODOLOGY TEST RESULTS DISCUSSION/CONCLUSTION,3,INTRODUCTION,Zero(Low)Po
2、wer Physics Test for PWRs It is important because-it is used to verify key parameters in Nuclear Design Report-it is on a critical path during ascension to power Measured Items-Critical Boron Concentration-Differential Boron Worth-Rod Worth-ITC,etc Core Status at LPPT-The core is critical at Hot Zer
3、o Power-The RCS temperature and boron concentration should be stable,4,INTRODUCTION,Current Methods for the Rod Worth Measurement-Rod Swap Method&Boron Dilution Method(1980s)1.used for 20 years 2.Optimized to Each Nucl.Power Plants but complex3.1012 Hrs,Boron Wastes,Human Error,etc.4.Initial Reactiv
4、ity:1000pcm-DRWM(Dynamic Rod Worth Measurement,WH,1990s)1.2Hrs per 8 banks,Reduce Human Error2.Minimize Boron waste treatment3.Very Simple4.Small Initial Positive Reactivity:50pcm5.Not applied to CE System 80 NSSS in USA,OBJECTS,Development of Dynamic Control Rod Reactivity Measurement Methodology w
5、ith background signal treatment Application of DCRM to KSNPs and WH-type reactors in KOREA,5,METHODOLOGY(Test Process),White:uncompensatedRed:compensated,6,METHODOLOGY(Data Flowchart),DRCF,*DRCF(Density-to-Response Conversion Factor)*DSCF(Dynamic-to-Static worth Conversion Factor),Check the Criteria
6、,Calculate Measured Static Rod Worth and Check Tech.Spec.Allowance,Insert and Withdraw a control bank with the Maximum Stepping Speed(5MIN),Measure and Record the Ex-core Detector Signals,Normalize the Signals to Remove the Efficiency of Each Detectors,Convert the Signals to Core Average Neutron Den
7、sities Using DRCFs,DSCF,7,DCRM vs.DRWM,SD(t)=s(t)D/SSFD,Inverse Kinetics Solver,Top,Bottom,Reactivity Curve of D,n=nB+nT,DSCF,Static Rod Worth,DCRM,DRWM,nD=SD(t)*DRCFD,Static Spatial Factor for the ex-core detector,SD(t)=s(t)D/s(0)D;D=B,T,Guess B.G.Signals,nD(t)=S(t)D/S(0)D,Check the Criteria,n=nB+n
8、T,Inverse Kinetics Solver,Static Rod Worth,DSF,Density-to-Response Conversion Factor,Fixed B.G.Signals,8,METHODOLOGY(Background Effect),Uncompensated Case,Search BSs iteratively,Optimal BS,A Test Bank(700pcm),9,TEST RESULTS(Measured data),Inserted Initial reactivity:30pcm,Inserted Initial reactivity
9、:60pcm,CASE I LP,CASE II LP,D,D,10,TEST RESULTS(Example:DSCFs,DRCFs),CASE I,CASE II,11,TEST RESULTS(Final Results:KSNP),CEATYPE,Design(pcm),Boron Dilution&ROD SWAP,Measured(pcm),807.8,R5,807.8,R4,Error(%,E),2.6,283.2,R3,305.2,7.2,Acceptance Criteria(|E|),15%,15%,Design(pcm),DCRM,Measured(pcm),308.8,
10、325.3,Error(%),5.4,341.5,354.3,3.8,ExpectedAcceptance Criteria(|E|),10%,10%,440.5,451.4,2.5,10%,840.0,SB7,840.0,0.0,10%,837.3,879.0,5.0,10%,1931.0,SUM,1974.5,2.2,-6.528%,1928.1,2010.0,4.2,-6.528%,CASE I,600.1,R1,632.2,R2,5.4,382.7,R3,333.8,-12.8,15%,15%,604.1,627.9,3.9,340.5,321.1,-5.7,10%,10%,485.5
11、,477.4,-1.7,10%,426.3,R4,389.6,-8.6,15%,454.4,425.4,-6.4,10%,840.0,SA5,788.3,-4.7,10%,819.9,788.6,-3.8,10%,CASE II,2777.2,SUM,2606.8,-6.1,-6.528%,2704.4,2640.4,-3.1,-6.528%,528.1,462.9,-12.3,15%,Avg.Error(%),6.7,4.2,Standard Dev.(%),4.4,1.5,12,TEST RESULTS(Two KSNPs),CASE I,CASE II,13,TEST RESULTS(F
12、inal Results:WH TYPE),14,CONCLUSION/DISCUSSION,To measure rod worths of PWRs in KOREA,KEPRI has developed the DCRM method comparable to the conventional methodThe DCRM method has been applied to a total of Six LPPTs(28 banks)of two WH 2-Loop plants,two WH 3-Loop plants,and Two KSNPs in KOREA Final m
13、easured static rod worths of total 27 banks show that the DCRM is a useful tool to measure rod worths w/o regard to reactor types;lower average error and standard deviation(4.2 3.1,3.0 2.0,respectively)It takes about 15 min per bank from the beginning of rod insertion to the finalizing of bank worth
14、A simple approach to eliminate background effect on the measured static worth also has been devised.,15,HTTP:/WWW.KEPRI.RE.KR,HAVE A GOOD Day!,16,METHODOLOGY(Inverse Reactivity Eq.),Actual system contaminated with BS,Clean system,17,DDRCS(Direct Digital Reactivity Computer System),TWOELECTROMETERS,S
15、TRIP CHART,REACTIVITY COMPUTER,SOURCE METER,18,TEST RESULTS(Final Results:BG),19,INTRODUCTION,Low-Low Leakage Loading Pattern-Low detector signal Long operating cycle length-High background signal Shot refueling outage-High background signal,OBJECTS,Recent Trends in PWR,Development of Dynamic Contro
16、l Rod Reactivity Measurement Methodology with background signal treatment Application of DCRM to KSNPs and WH-type reactors in KOREA,Low maximum stepping speed-increasing Background effect(43steps/min in KOREA,70 steps/min in USA),Special Point in KSNP,20,Definition,How to use,D R C F,21,Definition,How to use,D S C F,
