FCA critical experiment for validation of U capture cross section and experimental analysis

Kugo, Teruhiko ; Kitamura, Yasunori; Fukushima, Masahiro   ; Ando, Masaki  ; Yamane, Tsuyoshi; Okajima, Shigeaki  

Sodium void reactivity experiments were performed at FCA using uranium fueled core to obtain integral data for evaluation of epithermal capture cross section of U. Experimental analysis were carried out with use of various nuclear data libraries including JENDL-4.0. The ratio of calculated value to experiment value (C/E) are less than unity with JENDL-3.3, ENDF/B-VII.0 and JEFF-3.1. This tendency of C/E values is similar to those for the sodium void reactivity experiments at BFS. Newly obtained integral data at FCA has a large sensitivity to U capture cross section from several hundreds eV to several keV. Thus, the new integral data are useful for validation of epithermal capture cross section of U and are used for the re-evaluation capture cross section of U in subgroup-29 of OECD/NEWA/NSC/WPEC.