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Yanai, Tomohiro; Ogasawara, Yasushi; Hanakawa, Hiroki; Oto, Tsutomu; Kawamata, Takanori; Kameyama, Yasuhiko
no journal, ,
JMTR refurbishment had started since 2007. Refurbishment of instrumentation system has completed on March 2011. Official inspections before operation was carried out 4 times between March 2010 and April 2011. Refurbishment work was carried out in schedule except delay of the last inspection official inspection before operation due to Great East Japan Earthquake. Instrumentation system had used for 42 years since first criticality. Nuclear instrumentation was partly refurbished in 1981 but other instrumentation devices were in service till August 2006. The refurbishment plan was made not only by using original design concept also by considering aging, important degree of safety, availability of change parts, and raising operation rate. Almost all devices were renewal in this refurbishment work in order to be able to use the instrumentation system for 20 year for which JMTR will operate. This report summarized the refurbishment work and future task of JMTR instrumentation system.
Tokubo, Keisuke*; Kameyama, Takanori*; Suyama, Kenya
no journal, ,
For conducting the criticality calculation, it is necessary to set the nuclide density data. To evaluate them with high reliability needs large effort than expected because many parameters are required. A computer program AND was developed for the evaluation of nuclide density data for the criticality safety evaluation. It has been pointed out that the AND program used old data and it could not evaluate the nuclide density data of U-234 and U-236. The revise of AND was carried out to overcome these problems. We conducted the analyses of the criticality experiments of STACY and TCA by adopting the continuous energy Monte Carlo code MVP2.0 and revised AND. And the improved performance of the revised AND was confirmed.
Sakamoto, Masahiro*; Kameyama, Takanori*; Tada, Kenichi
no journal, ,
To investigate the criticality of the fuel debris, we estimate the impact of composition and configuration of fuel debris on the k-effective. And the heterogeneous effect of the fuel debris is investigated using the six factor formula.