JENDL/AD-2017の多群中性子放射化断面積ライブラリ開発

JENDL Activation Cross Section File for Nuclear Decommissioning 2017 (JENDL/AD-2017) [1] was released in 2018. This file includes neutron-induced nuclear reaction cross-sections of 311 nuclides from 10-5 eV to 20 MeV. Dr. Okumura et al. developed a multi-group neutron activation cross-section library (MAXS2015) based on the nuclear data libraries JENDL-4.0 and JEFF-3.0/A for activation calculations in nuclear facility decommissioning [2]. Thus a multi-group neutron activation cross-section library (MAXS/AD-2017) with the same format as MAXS-2015 has been developed from JENDL/AD-2017 for activation calculations in nuclear facility decommissioning. >

MAXS-2015 was produced with the NJOY2012 [3] code. However it was found that the groupr module in NJOY2012 could not treat the production cross sections for radionuclides. Then the PREPRO 2018 [4] code was adopted for producing a group-wise file of JENDL/AD-2017. The following modules in PREPRO 2018 were used; ENDF2C, LINEAR, RECENT, SIGMA1, ACTIVATE, FIXUP, DICTIN, GROUPIE. The calculation conditions are as follows,

• Temperature : 300 K
• Group structure : VITAMIN-B6 (199 groups)
• Weight function : Maxwell+1/E+Fission
• Infinite dilution

The produced group-wise file of JENDL/AD-2017 was converted to MAXS/AD-2017 of the MAXS format [2] with a small program. >

MAXS/AD-2017 will be converted to an ORIGEN-S library and be tested with the JPDR decommissioning data. Then MAXS/AD-2017 will be released. >

References

[1] https://wwwndc.jaea.go.jp/ftpnd/jendl/jendl-ad-2017.html

[2] K. Okumura, K. Kojima, K. Tanaka, “Development of multi-group neutron activation cross-section library for decommissioning of nuclear facilities,” Proc. of 2014 Symposium on Nuclear Data, p. 43, JAEA-Conf 2015-003(2016).

[3] R. E. MacFarlane, D. W. Muir, R. M. Boicourt, A. C. Kahler, “The NJOY Nuclear Data Processing System, Version 2012,” LA-UR-12-27079, Los Alamos National Laboratory (2012).

[4] https://www-nds.iaea.org/public/endf/prepro2018/