Riyana, E. S.*; Suda, Shoya*; Ishibashi, Kenji*; Matsuura, Hideaki*; Katakura, Junichi*; Sun, G. M.*; Katano, Yoshiaki
Journal of Nuclear Science and Technology, 56(5), p.369 - 375, 2019/05
Nuclear reactors produce a great number of electron antineutrinos mainly from beta-decay chains of fission products. Such neutrinos have energies mostly in MeV range. We are interested in neutrinos in a region of keV, since they may have information on fuel burn-up and may be detected in future with advanced measurement technology. We calculate reactor antineutrino spectra especially in the low energy region. In this work we present neutrino spectra from various reactors such as typical PWR reactor and others types of reactors for comparison. Our result shows the electron antineutrino flux in the low energy region increases with burn-up of nuclear fuel by accumulated nuclides with low Q values in beta decay.
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.
Matsumura, Takeshi*; Inami, Toshiya; Kosaka, Masashi*; Kato, Yoshiaki*; Inukai, Takaki*; Ochiai, Akira*; Nakao, Hironori*; Murakami, Yoichi*; Katano, Susumu*; Suzuki, Hiroyuki*
Journal of the Physical Society of Japan, 77(10), p.103601_1 - 103601_4, 2008/10
Katano, Yoshiaki; Matsuo, Hidehiko
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no abstracts in English
Murata, Masato; Katano, Yoshiaki; Usui, Hideo; Kubota, Shintaro
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As of October 2014, four Nuclear Power Plants, such as Tokai-1, Hamaoka Power Station Unit 1, Unit 2 and Fugen, have been carried out decommissioning, and JAEA's facilities, such as JRR-2, JRTF, RHL, PFFF, have been decommissioned, too. This presentation shows the decommissioning strategy and current status of decommissioning in Japan at ANUP2014.
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History of Fugen and Outlook of decommissioning project and program are described. As the technologies and progress of Fugen decommissioning project, (1) Plant characterization, (2) System decontamination, (3) Tritium decontamination, (4) Turbine system demolition, (5) Development of reactor dismantlement technology, (6) Waste management, (7) Systems engineering are described. Moreover, (8) research of the aging management is mentioned.