JAEA-Conf 2011-002 - 日本原子力研究開発機構

Koichi IEYAMA, Kosuke SHIMOZATO, Takanori KITADA
Osaka University, 2-1Yamada-oka, Suita-shi, Osaka, Japan, 565-0871
k-ieyama@ne.see.eng.osaka-u.ac.jp
Analyses were performed to verify nuclear data of some rare-earth elements(Dy, Ho, Er and Tm) by using
the continuous energy Monte-Carlo code: MVP, and to evaluate the validity of the cross section libraries
(JENDL-4.0, JENDL-3.3, ENDF/B-VII.0 and JEFF-3.1) by comparing infinite dilution cross section in SRAC
library 107 energy groups. The difference of energy-integrated capture rate among these libraries is about 0.1%
for Dy and 0.2% for Er at both E3 and EE1 coresand the influence on energy-integrated capture rate by the
difference of the cross section libraries is small at these cores.Though there is a relatively large difference in
the C/E value of Ho2O3 at EE1 core between ENDF/B-VII.0 and JEFF-3.1, the difference of energy-integrated
capture rate between these libraries is about 0.8% at EE1 core.
JAEA-Conf 2011-002
The rare-earth elements would be useful as an advanced burnable poison. However, only a few critical
experiments with rare-earth element have been carried out so far to validate the accuracy of their nuclear data.
Critical experiments with four rare-earth
0.05
elements (Dy, Ho, Er and Tm) at Kyoto
University Critical Assembly (KUCA) 0.04
E3 B3/8"P36EU(3)
H/235U 317
were performed in two kinds of cores (E3 0.03
EE1 B1/8"P60EU-EU(5)
and EE1 core) with different neutron
H/235U 52
spectra shown in Fig. 1. The validity of
0.02
cross section of rare-earth elements was 0.01
estimated from the analysis of measured
0
data by the continuous energy 1.E-03 1.E-01 1.E+01 1.E+03 1.E+05 1.E+07
Monte-Carlo code; MVP and infinite
energy[eV]
dilution cross section in SRAC library
107 energy groups.
Fig. 1 Neutron Spectrum for each unit cell
normalized neutron flux[-]