Status of criticality safety research at NUCEF Nakajima, Ken [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment] 42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; EXPERIMENT PLANNING; ZERO POWER REACTORS; CRITICALITY; SAFETY; AQUEOUS SOLUTIONS; PULSED REACTORS; REACTIVITY INSERTIONS; URANYL NITRATES; PLUTONIUM NITRATES Two critical facilities, named STACY (Static Experiment Critical Facility) and TRACY (Transient Experiment Critical Facility), at the Nuclear Fuel Cycle Safety Engineering Research Facility (NUCEF) started their hot operations in 1995. Since then, basic experimental data for criticality safety research have been accumulated using STACY, and supercritical experiments for the study of criticality accident in a reprocessing plant have been performed using TRACY. In this paper, the outline of those critical facilities and the main results of TRACY experiments are presented. (author) Japan Atomic Energy Research Inst., Tokyo (Japan) OSTI as DE98755719 Japan 1998-03-01 English Conference Conference: 1997 symposium on nuclear data, Tokai (Japan), 27-28 Nov 1997; Other Information: PBD: Mar 1998; Related Information: Is Part Of Proceedings of the 1997 symposium on nuclear data; Yoshida, Tadashi; Fukahori, Tokio [Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Nuclear Code Committee of Japan] [eds.]; PB: 372 p. Medium: ED; Size: pp. 15-20 https://doi.org/ ON: DE98755719 [] JAERI-Conf-98-003; CONF-9711144-; INDC(JPN)-180/U Other: ON: DE98755719; TRN: JP9807140 JPN; SCA: 420203; PA: JPN-98:007140; EDB-99:016339; SN: 98001997731 2018-02-27 300333 https://www.osti.gov/etdeweb/servlets/purl/300333