JAEA-Conf 2011-002 - 日本原子力研究開発機構

Fig.9 165 Ho capture cross section Fig.10 165 Ho capture rate difference at EE1 core
Analyses were performed to verify nuclear data of some rare-earth elements(Dy, Ho, Er and Tm) in the
cross section libraries (JENDL-4.0, JENDL-3.3, ENDF/B-VII.0 and JEFF-3.1) by using MVP calculation. The
remarkable discrepancy of C/E value from 1.0 is not obtained for all elements and cores, although there is a
relatively large discrepancy in the C/E value of Ho2O3 at EE1 core between ENDF/B-VII.0 and JEFF-3.1.
To be clear the discrepancy of C/E value by considering the difference in cross section among these
libraries, infinite dilution cross section in SRAC library 107 energy groups are used for energy-integrated
capture rate. The difference in the cross section can be seen in some energy ranges, however the difference of
energy-integrated capture rate among these libraries is small within 0.1% for Dy and 0.2% for Er at both cores.
The magnitude of the difference is small and is consistent to the tendency of the C/E value among libraries.
The largest difference in C/E value is obtained in the case of Ho at EE1 core between ENDF/B-VII.0 and
JEFF-3.1, however this difference could not be explained from the comparison of infinite dilution cross section
in 107 energy-groups, therefore the further investigation is planning to be clear the cause of the difference.
This work has been carried out in partly under the Visiting Researcher's Program of the Research Reactor
Institute, Kyoto University. The authors are deeply grateful to the staffs of KUCA, including Dr. Tsuyoshi
Misawa, Dr. Choel-Ho Pyeon, Dr. Lim Jaeyong, Mr. Hiroshi Nakamura, Mr. Hiroshi Yamamoto, Dr. Tadafumi
Sano, Mr. Tomoyoshi Takeshita and Mr. Yoshiaki Tanaka for their generous help and cooperation during the
experiments.
JAEA-Conf 2011-002
[1] K.Shimozato, K.Ieyama, T.Kitada et al., “Measurements and Analysis of Reactivity Worth of Rare-Earth
Elements at Kyoto University Critical Assembly,” Proc. Int. Conf. on the Physics of Reactors
(PHYSOR2010), May 9-14, 2010, Pittsburgh, Pennsylvania, USA.