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Nakashima, Fumiaki
Hoshasen Bogo Iryo, (8), p.33 - 37, 2012/12
Present status of FBR in the world and Japan after Fukushima-Daiichi accident.
Nakashima, Fumiaki
Hoshasen Bogo Iryo, (7), p.19 - 23, 2011/12
Monju safety countermeasures based on Fukushima-Daiichi accident and safety reviews against earthquake and tsunami are shown.
Nakashima, Fumiaki
Hoshasen Bogo Iryo, (6), p.29 - 33, 2010/12
no abstracts in English
Usami, Isao; ; Nakashima, Fumiaki;
Proceedings of 9th International Conference on Nuclear Engineering (ICONE-9) (CD-ROM), 0 Pages, 2001/00
None
Usami, Isao; Suzuoki, Zenro; ; Nakashima, Fumiaki
Proceedings of 9th International Conference on Nuclear Engineering (ICONE-9) (CD-ROM), 0 Pages, 2001/00
None
Shirakata, Keisho; ; Nakashima, Fumiaki
Nuclear Science and Engineering, 131, p.137 - 198, 1999/00
None
Usami, Isao; ; Nakashima, Fumiaki
Proceedings of 9th International Symposium on Reactor Dosimetry (ISRD-9), p.865 - 872, 1999/00
None
Nakashima, Fumiaki; ; Usami, Isao; ; ; 2 of others*
Proceedings of International Conference on the Physics of Reactors (PHYSOR '96), E-76- Pages, 1996/00
None
Yamamoto, Ken; Kobori, Tetsuo; Kanegae, Naomichi; Ozawa, Kenji; Komiya, Kazuyoshi; Tsubota, Toshihide; Nakashima, Fumiaki; Noda, Kimio; Suzuki, Takeo; Yoshino, Kenichi; et al.
PNC TN2450 93-001, 190 Pages, 1993/03
no abstracts in English
Shirakata, Keisho; ; Nakashima, Fumiaki
Nuclear Science and Engineering, 113(2), p.97 - 108, 1993/02
Times Cited Count:8 Percentile:63.72(Nuclear Science & Technology)None
Nakashima, Fumiaki
Proceedings of International Conference on Fast Reactor and Related Fuel Cycles, 1, 8-2 Pages, 1991/00
*; *; *; 7 of others*
PNC TN2410 89-003, 349 Pages, 1989/03
The works of JUPITER sub-working group in FT'88 are summarized in this report. JUPITRR-III program is the co-operative research program between PNC and DOE, using ZPPR in ANL-W. The JUPITER sab-working group is organized by the reactor physics group of Reactor Research and Development Project, PNC, for planning and analysis of the experiment in JUPITER-III program. The first half of the JUPITER-III program, the ZPPR-17 program, was physics benchmark experiments to study the neutronic behavior of a 650 MWe-size, axially heterogeneous LMR core. The second half of the program, the ZPPR-18 program, was 1000 MWe-size two-zone homogeneous cores. ZPPR-17 was analysed almost completely, but ZPPR-18 analysis is being prepared. The main results of this year are as follows. (1)The following conclusions were obtained from the ZPPR-17 analysis. (i)In addition to the standard analysis model, the center-line and multi-drawer models were used. The effects on criticality were +0.17% for the former model and +0.080.09% for the latter model. The C/E values were almost the same as those for ZPPR-9 and ZPPR-13A. (ii)The C/E values were about 0.9 at the core center, and became about 5% higher at the core edge. The similar radial variations of C/E were observed in reaction rate distributions. The magnitude of 510% in the mispredictions are consistent with the previous values obtained in the analysis of the homogeneous core. (iii)The C/E values of sodium void reactivities were about 1.21.5 for the core regions, and about 0.8 for the internal blanket regions. The C/E values of sample reactirities in the internal blanket region were smaller than those in the core region by about 20% for Pu sample and by about 10% for B sample. The same underprediction in the internal blanket region was also seen in ZPPR-13A. (2)An attempt was made for building a data base system for the JUPITER program using the ZPPR-17A experimental data as an example. Some ...
Shirakata, Keisho; Nakashima, Fumiaki; Sanda, Toshio*; *; Kawashima, Masatoshi*; *; *
PNC TN2410 88-004, 359 Pages, 1988/03
The JUPITER-III program, which started in Jan. 1987, successfully ended after one year experimental period without any delay from the original schedule. In the study last year, we mainly proceeded the experimental planning checks and data arrangement. This time studies were done putting an emphasis on the analysis of the experimental data and following conlusions were derived from the studies. (1)Pre-analysis for ZPPR-18 was done attempting to check the experimental plan. The result was actually reflected to the experiments for ZPPR-18 successfully. (2)Analysis of criticality for ZPPR-17A, 17B and 17C was done. The C/E value 1.0003 for ZPPR-17A comes to be almost the same value as that for ZPPR-9, which is 0.9995. (3) evaluation was made for ZPPR-17A and ZPPR-17B. The value obtained in this study is higher by 3 % than that of ANL, which shows the same tendency as found in the JUPITER-I and II analyses. (4)Control rod calculations were done for ZPPR-17A and 17B. The following C/E values were obtained as a result. Plate type control rod : 0.8710.899. Pin type control rod : 0.8830.890. (5)Experimental data arrangement was done for large zone sodium void experiments and for sodium void drawer oscillating experiments. (6)Criticality analysis for ZPPR-12 was performed for the pin cores and the plate Cores. The C/E value for central and edge pin zone cores agreed with those for the plate cores as shown bellow. Central pin : 1.018. Edge pin : 1.019. Plate cores : 1.020 (7)An attempt was made for building a data base system for the JUPITER programs, using the ZPPR-17A experimental data as an test example. (8)Multidrawer effect was evaluated for ZPPR-17A. The effect on criticality is +0.17k/k.
*; Sanda, Toshio*; *
PNC TN2410 87-006, 291 Pages, 1987/05
JUPITER-III program (a joint study between PNC and DOE) was started in order to obtain informations required for designs of large LMFBR cores. Experimental plans, experimental data arrangement and their preliminary analyses were carried out, and the following results were obtained. (1) Final experimental plans were determined for the first axial heterogeneous core ZPPR-17A on Japanese proposed plans through the meeting between PNC and ANL. The experiments in the ZPPR-17A Assembly have completed as proposed. (2) The analysis models suitable for JUPITER-III were selected. Detailed analysis models for cell heterogeneity and so on were also discussed. C/E value of k for ZPPR-17A (AHC) is lower than that of ZPPR-9 (HOC) by about 0.1%. (3) Information for the ZPPR-12 and ZPPR-13D experiments, which were supplementally provided from ANL to JUPITER-III program, were investigated from the points of the design studies. No large discrepancies were found in the pin-plate biases in the first analysis of the criticality of the ZPPR-12 series. The magnitude of the discrepancy in the pin-plate bias was 0.1%k in the present analysis. Present results showed different tendency in the biases for the criticality from the results obtained in the international benchmark calculations for the CADENZA programs. (4) The results of JUPITER-I, II and FCA experiments and their analyses were assessed from the standpoints of the planning of JUPITER-III program and their analyses.
Otani, Nobuo*; *; *
PNC TN241 84-13, 679 Pages, 1984/12
Numerical results of radiation distribution in the plant of Prototype Fast Breeder Reactor "MONJU" are presented. Calculations were performed for the shielding design of "MONJU" by the two-dimensional discrete ordinate radiation transport code "DOT 3.5". For estimating MONJU shielding design parameters. 19 radiation distributions from the core to the IHX and pump room of the primary coolant system were calculated, using reactor core fissions as the source. Numerical data in this report are nominal computational results by the DOT 3.5 code and shielding design judgements are not included. The report is summarized for reference for shielding design calculations for future FBR plants.