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Sato, Hiroyuki; Ohashi, Hirofumi
Proceedings of 27th International Conference on Nuclear Engineering (ICONE-27) (Internet), 8 Pages, 2019/05
To establish a probabilistic approach for assessment of toxic gas leakage accidents in a H
plant, the present study focusses on development of an uncertainty analysis method for toxic gas concentration in a control room. The method consists of 6 steps; (1) Identification of uncertainty factors, (2) derivation of variable parameters, (3) identification of uncertainties in variable parameters, (4) identification of important factors considering the sensitivity analysis results and expert opinions, (5) uncertainty propagation analysis, (6) assessment of uncertainty analysis results. The method is then applied to representative toxic gas leakage accidents in a H plant by IS process coupled to the HTTR. The results obtained in the study leads us to the conclusion that the suggested method can successfully characterize and quantify uncertainties in the toxic gas concentration in control room.
Watanabe, Yuichi*; Muramatsu, Ken; Oikawa, Tetsukuni
Nuclear Engineering and Design, 235(23), p.2495 - 2512, 2005/12
Times Cited Count：2 Percentile：17.57(Nuclear Science & Technology)This paper presents an evaluation of seismic capacity of a group of vertical U-tube type heat exchangers(HXs) with support frames for residual heat removal systems of BWRs for seismic Probabilistic Safety Assessment in Japan. The median capacity was evaluated by a time history response analysis with a detailed model for a representative HX selected from four HXs. The logarithmic standard deviation(LSD) for uncertainty due to lack of knowledge was evaluated with consideration of the variabilities in three influential parameters, i.e., diameter of anchor bolt, weight of HX and position of center of gravity of HX. The dominant failure mode of HXs was the failure of anchor bolts of lugs mainly due to shearing stress. The capacity expressed in terms of zero period acceleration on the foundation of HX was evaluated to be 4,180 Gal(4.3 g) for median, LSD for uncertainty due to randomness was 0.11 from the variability in material property and LSD due to lack of knowledge was 0.21 to 0.53 depending on combination of the variability in design parameters to be considered.
Cs due to soil types by using the monitoring data around the Chernobyl Nuclear Power PlantTakahashi, Tomoyuki*; Homma, Toshimitsu
Hoken Butsuri, 36(2), p.111 - 121, 2001/06
no abstracts in English
; Kondo, Masaaki; Watanabe, Yuichi*; *; *; Muramatsu, Ken
Proc. of Int. Topical Meeting on Probabilistic Safety Assessment (PSA'99), 1, p.77 - 84, 1999/00
no abstracts in English
; Kondo, Masaaki; *; Watanabe, Yuichi*; *; Muramatsu, Ken
Reliab. Eng. Syst. Saf., 62(3), p.251 - 271, 1998/00
Times Cited Count：11 Percentile：51.13(Engineering, Industrial)no abstracts in English
Muramatsu, Ken; *; *
20th CNS Nuclear Simulation Symposium, p.1 - 10, 1997/00
no abstracts in English
Abe, Kiyoharu; Muramatsu, Ken
Transactions of the 13th Int. Conf. on Structural Mechanics in Reactor Technology (SMiRT),Vol. 4, 0, p.647 - 652, 1995/00
no abstracts in English
Abe, Kiyoharu; Sugimoto, Jun; *
Reliab. Eng. Syst. Saf., 45, p.3 - 17, 1994/00
Times Cited Count：1 Percentile：25.75(Engineering, Industrial)no abstracts in English
*; Muramatsu, Ken
Dai-6-Kai Kakuritsuronteki Anzen Hyoka (PSA) Ni Kansuru Kokunai Shimpojiumu Rombunshu (IAE-9206), p.25 - 33, 1993/01
no abstracts in English
Iijima, Shungo*; Katakura, Junichi
JAERI-M 90-197, 87 Pages, 1990/11
no abstracts in English
Ishigami, Tsutomu; Kobayashi, Kensuke; *; *; *
JAERI-M 88-082, 72 Pages, 1988/05
no abstracts in English
Choi, B.; Nishida, Akemi; Takada, Tsuyoshi*
no journal, ,
In this paper, in order to clarify the influence of difference due to modeling methods on the results of seismic response analysis for a nuclear facility, seismic response analysis using various earthquake events was conducted and the findings obtained from the uncertainty assessment of the response result due to the difference in modeling methods are reported.
Choi, B.; Nishida, Akemi; Muramatsu, Ken*; Takada, Tsuyoshi*
no journal, ,
no abstracts in English
