Development of Dynamic Control rod Reactivity Measurement

1、m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 1 april 25 29 chicago, illinoise, usa physor2004 international meeting application of the dynamic control rod reactivity method to korea standard nuclear power plants kepri / e.k.lee m physor20

2、04 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 2 i contents introduction (backgro und d=b,t guess b.g. signals nd(t)=s(t)d/s(0)d check the criteria n=nb+nt inverse kinetics solver static rod worth dsf density-to-response conversion factor 1 1 nnnn n

3、rod in nnnn n aro erifeaif v ssf erifeaif v 2 1 2 1 ( ) (0) g n n nnfg ng rod in g n n nnfg ng aro v n t drcf v n fixed b.g. signals m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 8 methodology (background effect) -800 -700 -600 -500 -400 -

4、300 -200 -100 0 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for cb measured(t) pke ndr top bottom -800 -700 -600 -500 -400 -300 -200 -100 0 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for cb measured(t) pke ndr top bottom uncompensa

5、ted case -800 -700 -600 -500 -400 -300 -200 -100 0 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for cb measured(t) pke ndr top bottom search bss iteratively optimal bs a test bank (700pcm) m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear po

6、wer lab. reactor system eng. 9 i test results (measured data) case i time (sec) 02000400060008000 detector signals (na) 1 10 100 1000 bottom top cea position (cm) 0 100 200 300 r4r2 r3 sb7 case ii time (sec) 1000200030004000500060007000 detector signals (na) 1 10 100 1000 bottom top cea position (cm

7、) 0 100 200 300 r4 r2r3sa5r1 inserted initial reactivity : 30pcm inserted initial reactivity : 60pcm case i lp case ii lp 3 22 1 2 3 1 2 3 3 2 2 3 1 2 1 2 1 2 1 3 3 3 2 1 1 1 3 3 2 22 1 3 2 2 1 3 3 1 2 1 3 1 2 3 1 2 1 3 1 3 2 1 1 1 2 2 d d m physor2004 chicago/usa application of the dcrm to ksnps dr

8、c kepri nuclear power lab. reactor system eng. 10 i test results (example: dscfs, drcfs) case i case ii bottom - rod position (cm) - top 0100200300 dscf 0.99 1.00 1.01 1.02 1.03 1.04 dscf regulating bank 3 drcf 1.8 1.9 2.0 2.1 2.2 drcf bottom - rod position (cm) - top 0100200300 dscf 0.99 1.00 1.01

9、1.02 1.03 1.04 dscf regulating bank 4 drcf 1.9 2.0 2.1 2.2 2.3 drcf regulating bank 3 rod withdrawal (cm) 0100200300 dscf 0.96 0.97 0.98 0.99 1.00 1.01 1.02 dscf drcf 1.8 1.9 1.9 2.0 2.0 2.0 2.1 2.1 drcf regulating bank 4 rod withdrawal (cm) 0100200300 dscf 0.96 0.97 0.98 0.99 1.00 dscf drcf 1.9 2.0

10、 2.0 2.0 2.1 2.1 2.2 2.2 drcf m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 11 i test results (final results: ksnp) cea type design (pcm) boron dilution & rod swap measured (pcm) 807.8 r5 807.8 r4 error (%,e) 2.6 283.2r3305.27.2 acceptance

11、 criteria ( |e| ) 15% 15% design (pcm) dcrm measured (pcm) 308.8325.3 error (%) 5.4 341.5354.33.8 expected acceptance criteria ( |e| ) 10% 10% 440.5451.42.5 10% 840.0sb7840.00.0 10%837.3879.05.0 10% 1931.0sum1974.52.2-6.528%1928.12010.04.2-6.528% case i 600.1r1632.2 r2 5.4 382.7r3333.8-12.8 15% 15%

12、604.1627.93.9 340.5321.1-5.7 10% 10% 485.5477.4-1.7 10% 426.3r4389.6-8.6 15%454.4425.4-6.4 10% 840.0sa5788.3-4.7 10%819.9788.6-3.8 10% case ii 2777.2sum2606.8-6.1-6.528%2704.42640.4-3.1-6.528% 528.1462.9-12.3 15% avg. error (%)6.74.2 standard dev. (%)4.41.5 m physor2004 chicago/usa application of th

13、e dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 12 i test results (two ksnps) case icase ii -500 -450 -400 -350 -300 -250 -200 -150 -100 -50 0 50 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for r4 measured(t) pke ndr -500 -450 -400 -350 -300 -250 -2

14、00 -150 -100 -50 0 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for r4 measured(t) pke ndr -1000 -900 -800 -700 -600 -500 -400 -300 -200 -100 0 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for sb7 measured(t) pke ndr -900 -800 -700 -6

15、00 -500 -400 -300 -200 -100 0 100 050100150200250300350400 reactivity(pcm) core axial height(cm) dcrm : results for sa5 measured(t) pke ndr m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 13 i test results (final results: wh type) cea type d

16、esign (pcm) boron dilution & rod swap measured (pcm) 544ca514.5 cb error (%,e) -5.4 1,536cc1,482-3.5 acceptance criteria ( |e| ) 15% 10% design (pcm) dcrm measured (pcm) 532533 error (%,e) 0.3 1,4991,485-0.9 expected a cceptance criteria ( |e| ) 10% 10% 697 7122.1 10% 824cd776-5.9 15%814 767.5-5.7 1

17、0% 3,615sum3,453-4.5 10%3,5423,497 1.3 8% 2-loop 285ca291 cb 2.1 694cc669-3.6 15% 15% 279272-2.4 684686-0.3 10% 10% 1,3571,4093.8 10% 360cd3651.4 15%354 340-4.0 10% 350-1.1 10% 3-loop 2,698sum2,6641.3 10% 2,674 2,7071.2 8% 1,3591,339-1.5 10% 711680.9-4.2 15% 2,7171.6 3.1, 3.0 2.0, respectively) 4. i

18、t takes about 15 min per bank from the beginning of rod inserti on to the finalizing of bank worth 5. a simple approach to eliminate background effect on the measur ed static worth also has been devised. m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor s

19、ystem eng. 15 http:/www.kepri.re.kr have a good day ! m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 16 methodology (inverse reactivity eq.) 6 1 ( )( )( )( )( ) ( )( )( ), ( )( )( ). ( )( ) ii iiii i dn tttdc tt n tt c tn tt c t dttdtt 6 1

20、( )( )( )( )( ) ( )( )( )( ), ( )( )( ). ( )( ) ii iiextii i dn tttdc tt n tt c tstn tt c t dttdtt ( )( )( )( ) ( )( ) n tn ttn t n tn t 6 1 ( )( )( )( )( ) ( )( )( )( ), ( )( )( ). ( )( ) ii iiextii i dn tttdc tt n tt c tstn tt c t dttdtt actual system contaminated with bs clean system m physor2004

21、 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 17 ddrcs (direct digital reactivity computer system) two electrometers strip chart reactivity computer source meter m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. re

22、actor system eng. 18 i test results (final results: bg) cea type r5 r4 r3 bottom estimated b.g. signal strength (na) top 1.20242.1724 1.20142.0744 1.20332.1103 sb71.24032.1342 average1.21192.1228 case i stand. dev.0.01900.04119 r1 r2 r3 1.97631.7681 1.89481.6021 2.32771.8035 r41.62211.5390 sa52.0193

23、1.8471 case ii average1.96801.7120 cea type bottom estimated b.g. signal strength (na) top stand. dev.0.25350.1340 m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 19 i introduction low-low leakage loading pattern - low detector signal long o

24、perating cycle length - high background signal shot refueling outage - high background signal objects recent trends in pwr development of dynamic control rod reactivity measurement methodology with background signal treatment application of dcrm to ksnps and wh-type reactors in korea low maximum ste

25、pping speed - increasing background effect (43steps/min in korea, 70 steps/min in usa) special point in ksnp m physor2004 chicago/usa application of the dcrm to ksnps drc kepri nuclear power lab. reactor system eng. 20 definition , 1111 , , 1111 , 11 , ( )( )( )( ) ( ), ( )( ) ( ) ngng qnn tqnn t nnfggnnfgg ngng tot ngng qnn tqnn t nnfg arog aronnfg arog aro ngng ng qnn t nnfgg ng sum q nnfg