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Ueki, Taro
Proceedings of International Conference on Mathematics & Computational Methods Applied to Nuclear Science & Engineering (M&C 2017) (USB Flash Drive), 6 Pages, 2017/04
In Monte Carlo criticality calculation, the formation of a confidence interval is based on the central limit theorem for a series of tallies from generations in equilibrium. A fundamental assertion of the theorem is the convergence in distribution (CID) of an interpolated standardized time series (ISTS) of tallies. This article reports a spectral analysis approach to ISTS in order to assess the convergence of tallies in terms of CID. Numerical results are demonstrated for a preliminary model of uranium-concrete debris.
Masumoto, Kazuhiko*; Takeuchi, Ryuji
Oyo Chishitsu, 57(4), p.154 - 161, 2016/10
Fractures developing around the tunnel during the excavation result in issues related not only to the mechanical stability of the rock cavern, but also to the groundwater flow paths. In order to estimate the possibility of application of the GPR (Ground Penetration Radar) to estimate the fractures as low paths, the authors conducted the GPR survey along the side wall of 500 m access tunnel of the Mizunami Underground Research Laboratory of JAEA. The results of the profile measurements indicated that water-conductiong fractures were detected as a reflected waves using GPR survay. Furthermore, as the results of fixed-point measurements during the injection of the saline water, it could be indicated to estimate the flow paths of saline water in the fractures, in a non-destructive way, based on spectral analysis in the reflected waveforms of GPR.
Lee, S.; Kondoh, Takashi; Yonemoto, Y.*; Miura, Yukitoshi
Review of Scientific Instruments, 71(12), p.4445 - 4448, 2000/12
Times Cited Count：6 Percentile：44.18(Instruments & Instrumentation)no abstracts in English
Nakano, Hirotami*; Aono, Yoshinori*; Kondo, Ryo*; Matsukawa, Makoto; Miura, Yushi
Heisei-12-Nen Denki Gakkai Zenkoku Taikai Rombunshu, 2 Pages, 2000/00
no abstracts in English
Dietze, K.
JNC TN9400 99-089, 20 Pages, 1999/11
The integral experiments performed at the Rossendorf fast-thermal coupled reactor RRR/SEG have been reanalyzed using the JNC route for reactor calculation JENDL3.2/SLAROM / CITATION / JOINT / PERKY. The Rossendorf experiments comprise sample reactivity measurements with pure fission products and structural material in five configurations with different neutron and adjoint spectra. The shapes of the adjoint spectra have been designed to get high sensitivities to neutron capture or the scattering effect. The calculated neutron and adjoint spectra are in good agreement with former results obtained with the European route JEF2.2/ECCO/ERANOS. The C/E-values of the central reactivity worths of samples under investigation are given. Deviations in the results of both routes are due to the different libraries, codes, and self-shielding treatments used in the calculations. Results outside of the error are discussed.
Ogawa, Keizo*; Yokoi, Koichi*; Konishi, Naotoshi*
PNC TJ7718 98-001, 76 Pages, 1998/02
None
*; *; Imazu, Akira
PNC TN9410 88-080, 132 Pages, 1988/06
A series of analytical investigations were made into the seismic response characteristics of bellows, as a part of work aiming at establishing reliable seismic design and analysis methodologies for bellows piping systems. Simplified calculation methods were developed for the axial and lateral seismic response of bellows, in which bellows is modeled as an equivalent rod or beam, respectively. Using these methods, spectral response analyses were performed on the bellows with the number of convolutions as a parameter, and the results were compared with detailed FEM analysis by FINAS. Analyses were also made to compare with available vibration test data. The simplified methods were found to give fairly good results when compared with those by FINAS, and relatively conservative results when compared with experimental data. Through this study, simplified methods were established to evaluate the seismic response and stress of bellows with sufficient accuracy for practical design use.
; ; ; Shinohara, Yoshikuni; ; ; ; *; Horiki, Oichiro
JAERI-M 84-056, 62 Pages, 1984/03
no abstracts in English
*; ; ;
JAERI-M 8777, 35 Pages, 1980/03
no abstracts in English
; ;
Nuclear Instruments and Methods, 145(3), p.517 - 523, 1977/03
no abstracts in English
Tasaka, Kanji
JAERI-M 5947, 285 Pages, 1975/01
no abstracts in English
; ; ;
JAERI-M 5659, 40 Pages, 1974/04
no abstracts in English
; ; ;
JAERI 1227, 66 Pages, 1973/06
no abstracts in English
ray analysis softwares using reference spectraAoyama, Michio*; Akiyama, Masakazu*; Asai, Masato; Abe, Takaaki*; Sato, Yasushi*; Takano, Naoto*; Takamiya, Koichi*; Hamajima, Yasunori*; Muto, Giichi*; Yamada, Takashi*; et al.
no journal, ,
Performance of -ray spectrum analysis softwares is significantly important because it directly affects the results of nuclide identification and radioactivity measurement. The Expert Committee on Next-generation Gamma-ray Spectrometry, Science and Engineering Committee, Japan Radioisotope Association, performed intercomparison of -ray analysis software by analyzing the same reference spectra with several softwares used in Japan, to know and to improve their performance. It was found that the number of peaks detected by the peak search analysis and deduced peak areas were different among each of the softwares. The reasons why such differences occur are investigated in detail.
Masumoto, Kazuhiko*; Matsushita, Tomoaki*; Takeuchi, Ryuji
no journal, ,
The monitoring of groundwater condition in fractures around the rock cavern is important for safety assessment for high level radioactive waste. The GPR (Ground Penetrating Radar) method is unique technique to survey the water condition in fractures, indirectly, and with no disturbance of original groundwater condition. The authors conducted the GPR monitoring of infiltration of saline water on the side wall of the 500m access tunnel of Mizunami Underground Research Laboratory. The results showed that the difference of saline concentration in fractures caused the change of the reflection wave form and the intense of spectrum due to the results of spectrum analysis of reflection wave.
