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Hayashi, Kenta; Nakamura, Takahisa; Takagi, Hisatsugu; Horie, Kaoru; Nakayama, Tamotsu; Hashimoto, Kazuhiko; Hayashi, Shoichi; Nakamura, Shinji; Takenaka, Shigeki; Ishizuka, Nobuo; et al.
Proceedings of INMM 54th Annual Meeting (CD-ROM), 10 Pages, 2013/07
JAEA and USDOE (Los Alamos National Laboratory (LANL)) have been collaborating on spent fuel measurements with a PNAR/SINRD NDA instrument at Fugen, in the course of the NGSI Spent Fuel Nondestructive Assay Project. In this collaboration, LANL's role has been to design and fabricate the detector (integrated PNAR and SINRD system), while JAEA's role has been to undertake the installation of the detector at the appropriate position in the spent fuel pool and to prepare for the actual measurements. In this paper we report the rehearsal of the measurement using a mock-up detector and a dummy fuel assembly in December 2012 and the plan of actual measurements in June 2013 (at the time of submission of this paper).
Seya, Michio; Katano, Yoshiaki; Ebara, Noriyasu
Proceedings of INMM 54th Annual Meeting (CD-ROM), 10 Pages, 2013/07
For evaluation of the data measured data of Fugen spent fuel assemblies by the PNAR/SINRD detector, which was obtained in the JAEA and USDOE (LANL) collaboration, we need data on the Pu content distribution in the measured assemblies. For nuclear material accountancy, JAEA has data on the quantity of Pu in each spent fuel assembly that is based on burn-up calculations. However, this calculation is just for the total amount of Pu in an assembly. Therefore, we have done burn-up calculations for two MOX-B type assemblies with high burn-up and very low burn-up to obtain Pu content distributions along the vertical axis of an assembly and also distribution differences among inner, middle and outer fuel rods. The data of the Pu content distributions within an assembly will be useful for evaluating the measured data.
Katano, Yoshiaki; Ebara, Noriyasu; Takagi, Hisatsugu; Nakamura, Takahisa; Bolind, A.; Seya, Michio
Kaku Busshitsu Kanri Gakkai (INMM) Nihon Shibu Dai-33-Kai Nenji Taikai Rombunshu (Internet), 10 Pages, 2012/10
The ATR, "Fugen" was a prototype nuclear reactor moderated by heavy water but cooled by boiling light water. It terminated its operations in 2003 and is now being decommissioned. Nevertheless, the spent-fuel pool at Fugen still remains and currently contains both MOX spent-fuel assemblies, and it is flexible enough to be able to conduct Non Destructive Assays (NDA) experiments on the spent fuel assemblies. Therefore, JAEA and the U.S. Los Alamos National Laboratory (LANL) are planning to conduct a test of an integrated PNAR/SINRD NDA measurement system at Fugen in 2013. LANL is designing and constructing the system, and JAEA is preparing the Fugen site for the test. The total experience of preparing for and conducting NDA measurements on actual spent fuel assemblies will teach important lessons about the practicality of applying such measurements in the future to spent fuel assemblies from commercial LWR power plants, especially with regard to satisfying legal and safety requirements.
Ebara, Noriyasu; Katano, Yoshiaki; Nakamura, Takahisa; Takagi, Hisatsugu; Bolind, A.; Seya, Michio
Proceedings of INMM 53rd Annual Meeting (CD-ROM), 10 Pages, 2012/07
The Fugen advanced thermal reactor stopped operations in 2003 and is now being decommissioned. Nevertheless, the spent-fuel pool at Fugen still remains and currently contains both MOX and UO
spent-fuel assemblies. Because Fugen was a prototype, the standard operations at the spent-fuel pool are flexible enough to be able to conduct NDA experiments on the spent fuel. Therefore, JAEA and the U.S.DOE are planning to conduct a test of an integrated PNAR and SINRD NDA measurement system at Fugen in 2013. LANL is designing and constructing the detector, and JAEA is preparing the Fugen site for the test. It will be report to select for install location of NDA test device in spent fuel pool, how to installation and study of test flow.
Ebara, Noriyasu; Ishizuka, Nobuo
no journal, ,
Fugen Decommissioning Engineering Center shifted to the abolition measures on February 12, 2008. It reports on the work situation of the dismantlement such as the turbine cooling water system heat exchangers such as the main steam line such as the No3 and 4 feed-water heater in the outline and fiscal year 2008 of the plan of the abolition measures of "Fugen". The device to decontamination in the calandria tank etc. newly set up and the stored radioactive solid waste are sorted, and it introduces the installation situation and the outline of discretion and the device to reduce by compressing it. Moreover, it introduces the range of the removal of the dismantlement and decontamination scheduled in fiscal year 2009.