PENENTUANK qNSTANTAPELURUHANNEUTROSNE REMPAK 1iERAS REAKTOR DAYA AP-600

ABSTRAK
PENENTUAN KONSTANTA PELURUHAN NEUTRON SEREMPAK TERAS REAKTOR DAY A AP-600.
Penentuan konstanta pc uruhan neutron serempak teras r~or daya AP-600 telah diIakuktm deng:m
menggunak:m kombirulSi progrclll perl1itung:m sel WIMS/D-! ilim progrnnl Bat:m-2DIFF. PerllitWlg:m dil:tkuk:m
Wltllk teras a\val (BOC) ilim s ua bat:mg kalililli ditlrik ke atas. KaIkulasi sel ilitri beroagai jenis nlt1terial
pcmbcntllk tCGISdi l:tk'uk.'Ud1a lam 4 group energi neutron p:tda progr.uu mmsport S:ltud ilnensi (\VIMS/D-!). Scl
dipcrllitlmgk:m Wltuk Y4p Cl1mgk:t clemen b;tk:.trd Cllgmlm odelclu.\1erd Cllgml SllSlm:ms quare pitch, kemudiml
dihitlmg dimcnsi satu:ms elnya. atu scl satuan tcrdiri ilitri S:ltus :l!ll:m b;1l1mb1a kar ilim modCl(1tor.D :tri 5:ltu
satll:m scl ekivalal terscbutd ip lell data dinlCl1Ssi el scbawu ililttl nlaSukiompr ognU11W lMS/D-! yang dikcll:tI
dcng;m annulu.\"K. olISt;mtat Ulip. g lint:mg scbag;uk clu:mm progr.un WIMS/D-! dih'W1:tk:.msc bagai nl:lsukm\
pada progr.un difusi nClllron (Bat -2DIFF) Wltllk pcrlutUl1g:mt Cl1ISy: mg sesu:u deng:m 3 ililCGll\ pengkaY:l:m
d:ui b:lhm1b akar pCGmgkaet leme bakar leGISA P-600 yaitu 2, 2,5 ilim 3 %. D:tri h:1Silk elu:mm prognml BatanmIFF
diperoleh h:1fga fGlksi nu n &1sip = 6,932E.JJ3r um llSia rCGlttln eutron serelllpak 26,38 mikrodetik,
schingga dipcrolcl1 h;trga konst:ma peillruhan neutron scrempakt CGISrc :tk1ori lilya AP-600 adau1l12 62,8 dtJ<!.
Jika dib:mdingkan hasil perlutWl :m dcngan hasil des;tin tcrdSA P-600 Ill:tk:.l pelbcdLU\11yaai litl;u\ UI1tukh arga
fGlksi neutron kasip rutri h:1Sild .adalah 7,5E.JJ5d an tcrdapatp eroed;.1an8 % dcngan hasil pcrlutung:m
Batan-2Diff, sOOangkanW ltllk ia Terata neutron serem9ak hasil disain adalah 19,6 mikrodetik sehingga
diperoleh perbedaamtyaa da1ah3 ,6 %. Perbectaanin i disebabkank arena masih ada komponen terasy ang tidak
diketahui data-datanya sehingga. dimasukkan ke dalam perhitungan.
ABSTRACT
DETERMINAll0N OF PRO NEUTRON DECAY CONSTANT OF THE AP-600 REACTOR
CORE. Detennination of prompt neutron decay constant of the AP-600 reactor core has been perfonned using
combination of nvo codes WIMS 4 and Batan-2D IFF. The calaJIation was done at beginning of cycle and all
of control rods pulled out. Cell ge eration from various kinds of core materials was done witIl 4 neutron energ}.
group ill I-D trcmsporct ode S/D~). The cell is consideredf or ~ filel assemblyi n cluster model \\ith square
pitch arrange aIld then, the dim ion of its unit cell is calaJIated. The unit cell consist of a fuel and moderator
unit The unit cell dimensiona s. put data of \VIMSID;J code,c alled it aIU1ulusi,s obtained from tIle equivalent
unit cell. Macroscopic cross secti ns as output was used as input of neutron diffusion code Batan-2Diff for core
calculation as appropriate with ee enriclunent regions of the fuel of AP-600 core, n;unely 2; 2.5 and 3 %.
From result of diffusion code (Ba -2DIFF) is obtained the value of delayed neutron fnlction of 6,932E-O3 and
aveI"'clgper onlpt neutron life-time f 26.38 ~5,s o that the value of pronlpt neutron decay constaIlti s 262.8 s-l. If
it is compared the calculation re It \VitIl the design value, the dC\'iation are, for the design value of delayed
neutron fraction is 7.5E-{)3,a bout 0;;a, nd tIle designv alue of avcragep ronlpt neutron life time is 19.6 IS,a bout
34 IYor,e spectively. l1le deviatio beclusc tllere are still lmknO\\l1 SCVChcUo re conlponcnts of AP-600, so it
diwl 't include in c<uClllationy et.