Thermal hydraulic analysis of the JMTR improved LEU-core

Tabata, Toshio; Nagao, Yoshiharu; Komukai, Bunsaku; Naka, Michihiro; Takeda, Takashi*; Fujiki, Kazuo

JAERI-Tech 2002-100, 108 Pages, 2003/01

JAERI-Tech-2002-100.pdf:4.44MB

After the investigation of the new core arrangement for the JMTR reactor in order to enhance the fuel burn-up and consequently extend the operation period, the "improved LEU core" that utilized 2 additional fuel elements instead of formerly installed reflector elements, was adopted. This report describes the results of the thermal-hydraulic analysis of the improved LEU core as a part of safety analysis for the licensing. The analysis covers steady state, abnormal operational transients and accidents, which were described in the annexes of the licensing documents as design bases events. Calculation conditions for the computer codes were conservatively determined based on the neutronic analysis results and others. The results of the analysis, that revealed the safety criteria were satisfied on the fuel temperature, DNBR and primary coolant temperature, were used in the licensing. The operation license of the JMTR with the improved LEU core was granted in March 2001, and the reactor operation with new core started in November 2001 as 142nd operation cycle.

Post-pulse detail metallographic examinations of low-enriched uranium silicide plate-type miniature fuel

Yanagisawa, Kazuaki

JAERI-M 91-152, 195 Pages, 1991/10

JAERI-M-91-152.pdf:20.69MB

no abstracts in English

Measurement of overall temperature coefficient of reactivity of VHTRC-1 core by pulsed neutron method

Yamane, Tsuyoshi; ; Akino, Fujiyoshi; Kaneko, Yoshihiko

Journal of Nuclear Science and Technology, 27(2), p.122 - 132, 1990/02

https://doi.org/10.3327/jnst.27.122

no abstracts in English