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Ochiai, Masaaki
Nihon Genshiryoku Gakkai-Shi, 43(11), p.1070 - 1074, 2001/11
no abstracts in English
Odano, Naoteru; Ishida, Toshihisa; Ochiai, Masaaki
JAERI-Research 2001-044, 53 Pages, 2001/10
A very small reactor, MR-1G with a thermal output of 1 MW, is the integral-pressurized type reactor to be used for heat supply to an office building in a city. Neutronic study has been carried out for design of the MR-1G, the core of which could achieve continuous long-term operation without refueling for 10 years assuming a load factor of the core of 44 %. In the present study, arrangement of fuel rods and U enrichment of UO
fuel rods were surveyed as design parameters. The
U enrichment was determined to be 8.5 wt% to satisfy design requirement. Reactor physics parameters including reactivity coefficients and power distributions were evaluated for the determined core specifications. Reactor physics parameters related to core safety were also analyzed. Results of the safety analysis indicated that the determined core specifications satisfied design conditions. Reactor shutdown performance by dropping the reflector, which was adopted as a passive reactor shutdown system, was analyzed and confirmed it's availability from a viewpoint of reactor physics.
Yamagishi, Hideshi; Soyama, Kazuhiko; Kakuta, Tsunemi; Ochiai, Masaaki; Iwamura, Takamichi; Saishu, Sadanori*; Urakami, Masao*; Masuda, Naohiro*; Yamauchi, Yuki*; Otani, Junichi*; et al.
JAERI-Tech 2001-053, 19 Pages, 2001/08
no abstracts in English
Ishida, Toshihisa; Imayoshi, Sho*; Yoritsune, Tsutomu; Nunokaya, Hiroshi*; Ochiai, Masaaki; Ishizaka, Yuichi*
Journal of Nuclear Science and Technology, 38(7), p.557 - 570, 2001/07
Times Cited Count:21 Percentile:77.43(Nuclear Science & Technology)no abstracts in English
Nunokawa, Hiroshi*; Yoritsune, Tsutomu; Imayoshi, Sho*; Kasahara, Yoshiyuki*; Ochiai, Masaaki; Ishida, Toshihisa
JAERI-Tech 2001-040, 115 Pages, 2001/06
no abstracts in English
Yabuuchi, Noriaki; Takahashi, Masao*; Nakazawa, Toshio; Sato, Kazuo*; Shimazaki, Junya; Ochiai, Masaaki
JAERI-Research 2000-064, 76 Pages, 2001/02
no abstracts in English
Yabuuchi, Noriaki; Takahashi, Masao*; Nakazawa, Toshio; Sato, Kazuo*; Shimazaki, Junya; Ochiai, Masaaki
JAERI-Research 2000-063, 69 Pages, 2001/02
no abstracts in English
Iwamura, Takamichi; Ochiai, Masaaki
Proceedings of 1st Asian Specialist Meeting of Future Small-Sized LWR Development, p.7_1 - 7_9, 2001/00
JAERI has developed two types of small and medium size Light Water Reactors to meet the goals of innovative nuclear reactors such as sustainability and diversification of energy utilization. One is the Reduced-Moderation light Water Reactor (RMWR) with passive safety features. The reactor core consists of MOX fuel assemblies with tight lattice arrangement to increase the conversion ratio by reducing the moderation of neutron energy. The core design of 330MWe output with the operational cycle of 26 months was accomplished. A breeding ratio of 1.01, negative void coefficient and natural circulation cooling of the core were realized under the discharged burn-up of 60GWd/t. The other is the Passive Safe small Reactor for Distributed energy systems (PSRD) to diversify the nuclear energy utilization. An innovative advanced marine reactor (MRX) is used to supply the small grid electricity or electricity and heat co-supply by installing it on a barge. A small integral LWR for underground deployment is also studied for exclusive use of heat supply to household or office.
Kusunoki, Tsuyoshi; Odano, Naoteru; Nakajima, Nobuya; Fukuhara, Yoshifumi*; Ochiai, Masaaki
Nihon Genshiryoku Gakkai-Shi, 42(11), p.1195 - 1203, 2000/11
Times Cited Count:0 Percentile:0.00(Nuclear Science & Technology)no abstracts in English
Ochiai, Masaaki
Enerugi, 33(10), p.49 - 53, 2000/10
no abstracts in English
Takahashi, Teruo; Shimazaki, Junya; Nakazawa, Toshio; Yabuuchi, Noriaki; Fukuhara, Yoshifumi*; Kusunoki, Tsuyoshi; Ochiai, Masaaki
JAERI-Tech 2000-039, p.94 - 0, 2000/03
no abstracts in English
Ishida, Toshihisa; Kusunoki, Tsuyoshi; Odano, Naoteru; Yoritsune, Tsutomu; Fukuhara, Yoshifumi*; Ochiai, Masaaki; Hoshi, Tsutao*
Proceedings of International Workshop on Utilization of Nuclear Power in Oceans (N'ocean 2000), p.55 - 66, 2000/02
no abstracts in English
Nakajima, Nobuya; Kusunoki, Tsuyoshi; Odano, Naoteru; Ochiai, Masaaki
Dai-7-Kai Doryoku Enerugi Gijutsu Shimpojiumu Koen Rombunshu (00-11), p.225 - 228, 2000/00
no abstracts in English
Kusunoki, Tsuyoshi; Odano, Naoteru; Yoritsune, Tsutomu; Fukuhara, Yoshifumi*; Nakajima, Nobuya; Ochiai, Masaaki
Proceedings of the 4th JSME-KSME Thermal Engineering Conference, p.1_61 - 1_66, 2000/00
no abstracts in English
Nakajima, Nobuya; Ochiai, Masaaki
JAERI-Conf 99-014, p.218 - 0, 1999/12
no abstracts in English
Kugo, Teruhiko; Shimada, Shoichiro*; Okubo, Tsutomu; Ochiai, Masaaki
JAERI-Research 98-059, 40 Pages, 1998/10
no abstracts in English
Okubo, Tsutomu; Kugo, Teruhiko; ; Shimada, Shoichiro*; Ochiai, Masaaki
Proc. of Workshop on Advanced Reactors with Innovative Fuels, p.127 - 137, 1998/10
no abstracts in English
; Ochiai, Masaaki
JAERI-Conf 98-013, 279 Pages, 1998/09
no abstracts in English
; Okubo, Tsutomu; Ochiai, Masaaki
JAERI-Research 98-047, 46 Pages, 1998/08
no abstracts in English
Okubo, Tsutomu; X.Jiang*; Araya, Fumimasa; Ochiai, Masaaki
JAERI-Research 98-042, 49 Pages, 1998/08
no abstracts in English