Effect of U-238 and U-235 cross sections on nuclear characteristics of fast and thermal reactors Akie, Hiroshi; Takano, Hideki [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment]; Kaneko, Kunio 22 NUCLEAR REACTOR TECHNOLOGY; URANIUM; CROSS SECTIONS; COMPARATIVE EVALUATIONS; URANIUM 235; URANIUM 238; BENCHMARKS; MULTIPLICATION FACTORS; NUCLEAR DATA COLLECTIONS; FAST REACTORS; THERMAL REACTORS Benchmark calculation has been made for fast and thermal reactors by using ENDF/B-VI release 2(ENDF/B-VI.2) and JENDL-3.2 nuclear data. Effective multiplication factors (k{sub eff}s) calculated for fast reactors calculated with ENDF/B-VI.2 becomes about 1% larger than the results with JENDL-3.2. The difference in k{sub eff} is caused mainly from the difference in inelastic scattering cross section of U-238. In all thermal benchmark cores, ENDF/B-VI.2 gives smaller multiplication factors than JENDL-3.2. In U-235 cores, the difference is about 0.3%dk and it becomes about 0.6% in TCA U cores. The difference in U-238 data is also important in thermal reactors, while there are found 0.1-0.3% different v values of U isotopes in thermal energy between ENDF/B-VI.2 and JENDL-3.2. (author) Japan Atomic Energy Research Inst., Tokyo (Japan) OSTI as DE97758661 Japan 1997-03-01 English Conference Conference: ISND-1: 1. internet symposium on nuclear data, Tokai (Japan), 8 Apr - 15 Jun 1996; Other Information: PBD: Mar 1997; Related Information: Is Part Of Proceedings of the first internet symposium on nuclear data; Fukahori, Tokio; Iwamoto, Osamu; Nakagawa, Tsuneo [eds.] [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment]; PB: 285 p. Medium: ED; Size: pp. 30-36 https://doi.org/ ON: DE97758661 [] JAERI-Conf-97-004; CONF-9604220-; INDC(JPN)-178/U Other: ON: DE97758661; TRN: JP9709074 JPN; SCA: 220100; PA: JPN-97:009074; EDB-97:143924; SN: 97001866977 2018-05-18 544660 https://www.osti.gov/etdeweb/servlets/purl/544660