ANALISIS PERHITUNGAN SPEKTRUM NEUTRON WIMSID4- BAT AN-2DlFF PADA RSG-GAS DEN GAN NISBAH CADM IUM

ABSTRAK
ANALISIS PERHITUNGAN SPEKTRUM NEUTRON WIMS/D4-BATAN-2DIFF PADA RSGGAS
DENGAN NISBAH CADMIUM, Tel ,1\1 dil,\kukan analisis perhitung;m spektrum neutron
WIMSID-t-Batan-2DIFF deng,m carn membandingkan hasil perhitung,m nisbah cadmium tcrhadap hasil
ekspcrimcn di posisi m1diasi CIP d,m IP2, IP3 serta IP-t pada teras 10 RSG GAS. Nisbm1 cadmium yang
diukur dan dihitung adal,1\l kcping yang tcrbuat d,m Au, Mn d,m Co. Pcrhilung,m spektrum dil,tkukan
dalam 69 kclompok cncrgi dcngiU1t ampang lil1tiU1gr caksi scrapiU1k cping scbeS:15r -t I kclompok cncrgi
(hingga 10 McV). Nilai pcrbcda,m ;ml,lfa hasil pcrhilung,u1 nisbah cadmium dcng,u1 hasil ekspcrimcn
pada scmua kasus ada dalam interval 11,0% -26,3 'XI, YiU1g mana bcruda di luar rcntang dc\'iasi
peng1lkur;m. Dari hasil tcrscbut disimpulkan bah\\'a pcngguna,m WIMS/D4 dalam mcmb,mgkitkan
konst,mla kclompok untuk mcndapatkan spektnlm neutron, k11ususnya di dacrah non file/, kurang
memadai.
ABSTRACT
CALCULATION ANALYSIS OF WIMS/D4-BATAN-2DIFF NEUTRON SPECTRUM ON RSGGAS
WITH CADMIUM RATIO. The calculation analysis of WIMS/D4- Batan-2DIFF neutron
spectrum was perfonned by comparison the calculation result of cadmium ratio with the experiment result
on CIP, 1P2, IP3 and IP4 irradiation positions of RSG GAS tenth core. The foils of Au, Mn and Co \\"ere
used for detennination of the measured and calculated cadmium ratios. Spectrum calculation was done in
69 energy group \\ith 541 energy group (till 10 MeV) cross section of foil absolption reaction. The
difference values benveen cadmium ratio calculation and ex-periment result for all cases were in intef\'al of
11,0% -26,3% \\"hich are out of measurement deviation range. From these results, it concluded that the
use of WIM/D4 in generating group constant is not sufficient to obtain the neutron spectrum, especially
for non-fuel region.