JAEA-Conf 2011-002 - 日本原子力研究開発機構

Masahiro KIMURA, Takanori KITADA, and Yosuke INOUE
Osaka University, 2-1Yamada-oka, Suita-shi, Osaka, Japan, 565-0871
E-mail: m-kimura@ne.see.eng.osaka-u.ac.jp
Detailed evaluation of the criticality change observed in MOX core was performed based on sensitivity
analysis to clarify what is main cause of the difference in the criticality change between JENDL-3.3 and
JENDL-4.0. It is found that the difference in the criticality change between two libraries is mainly caused by
the change of 241 Am capture cross section, and the difference in the criticality change caused by the change of
239 Pu cross sections cancels among reaction types, although the change of 239 Pu cross sections brings a relatively
large impact on the difference in the criticality change for each reaction type.
JAEA-Conf 2011-002
NUPEC has been performing conceptual design studies of high moderation full MOX LWR cores. In a
series of experimental analyses, the overestimation of multiplication factor (keff) slightly increases as shown in
Fig. 1.
The target cores in this study are EPICURE MH1.2 (1993) and MISTRAL core4 (1999)
1.01
1.008
1.006
1.004
[1] . The
difference of overestimation in “keff” (diff-k)
between EPICURE MH1.2 (“keff”=k1) and
MISTRAL core4 (“keff”=k2) is about 0.6%Δk/k
by using the 107-group cross section data based
on JENDL-3.3 [2] . But it was reported that
“diff-k” between two cores is reduced to about
0.4%Δk/k by using the data based on JENDL-4.0
[3]
. To clarify what nuclides and reaction types
are dominant to “the difference in diff-k” (about
1
EPICURE MH1.2
MISTRAL
-0.2%Δk/k) between JENDL-3.3 and JENDL-4.0,
(1993)
core2
(1997)
core3
(1998)
core4
(1999)
sensitivity analysis was performed in this study. Fig. 1 Criticality of MOX cores (JENDL-3.3)
1.002