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Ichikawa, Kenta*; Kanda, Hironori; Yoshioka, Naoki*; Ara, Kuniaki; Saito, Junichi; Nagai, Keiichi
Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 6 Pages, 2018/07
Studies on the suppression of the reactivity of sodium itself have been performed on the basis of the concept of suspended nanoparticles in liquid sodium (sodium nanofluid). According to the experimental and theoretical results of studies for sodium nanofluid, velocity and heat of sodium nanofluid-water reaction are lower than those of the pure sodium-water reaction. The analytical model for the peak temperature of a sodium nanofluid-water reaction jet has been developed in consideration of these suppression effects by the authors. In this paper, the prediction method for mitigation effects for a damage of adjacent tubes in a steam generator tube rupture (SGTR) accidents is arranged by applying this analytical model for the peak temperature of the reaction jet. On the assumption that the sodium nanofluid is used for the secondary coolant of sodium-cooled fast reactor (SFR), mitigation effects under the design-base accident (DBA) condition and the design-extension condition (DEC) of SGTR are estimated by using this method. As a result, there is a possibility to reduce the number of damaged tubes and to suppress the pressure generated by SGTR accidents by using sodium nanofluid in the secondary coolant.
-ray spectrometry for the rapid radioactivity evaluation of solidified products prepared from radioactive wastesHaraga, Tomoko; Kameo, Yutaka; Hoshi, Akiko; Yonezawa, Chushiro*; Nakashima, Mikio
JAERI-Tech 2005-050, 35 Pages, 2005/09
JAERI-Tech-2005-050.pdf:1.35MB
Non-destructive -ray spectrometry has been examined as a simple and rapid radioactivity measurement technique for the solidified products prepared by plasma melting for low level radioactive miscellaneous wastes generated from nuclear facilities. The Compton background resulting from the coexisting radionuclides pose a problem in the usual -ray spectrometry which uses only a Ge detector. In order to reduce the background count and to measure the interested nuclide selectively, the coincidence and the anti-coincidence -ray spectrometry using the Ge-BGO detector system were examined. As a result of applying the anti-coincidence -ray spectrometry to a single -ray emitter 
Cs and the coincidence -ray spectrometry to multiple -ray emitter 
Eu under existence of 
Co, the detection limits of Cs and Eu in the sample, which contained Co, were reduced by a factor of about 6 and 1.5, respectively. It was confirmed that the present methods are useful for the -activity measurement of solidified products.
Yamauchi, Michinori*; Sato, Satoshi; Nishitani, Takeo; Kawasaki, Hiromitsu*
Proceedings of 21st IEEE/NPSS Symposium on Fusion Engineering (SOFE 2005) (CD-ROM), 4 Pages, 2005/09
no abstracts in English
Yonomoto, Taisuke; Okubo, Tsutomu; Iwamura, Takamichi; Ishida, Toshihisa
Proceedings of 11th International Conference on Nuclear Engineering (ICONE-11) (CD-ROM), 8 Pages, 2003/04
An innovative concept of the pressure suppression system having functions of water injection and non-condensable gas confinement is developed for the next generation light water reactors (LWRs). The use of the system is advantageous for the mitigation of effects of the loss-of-coolant accidents (LOCAs) in (1) keeping the containment pressure as low as for the conventional LWRs, (2) injecting water to the containment for cooling the reactor pressure vessel (RPV) and/or flooding a break, and (3) confining the non-condensable gas in the drywell. The gas confinement function makes the system considerably suitable for reactor designs with passive cooling systems utilizing heat exchangers, such as the steam generator (SG) secondary side cooling system for an integral reactor, and the passive containment cooling system (PCCS), because it avoids adverse effects of non-condensable gas on the heat transfer performance during LOCAs. The usefulness of the developed concept is confirmed in the RELAP5/MOD3 code calculation.
*; Nakahira, Masataka; Takahashi, Hiroyuki*; Tada, Eisuke; *; *
JAERI-Tech 99-026, 158 Pages, 1999/03
no abstracts in English
Watanabe, Kazuhiro; Ito, Takao*; Matsuoka, Mamoru
Purazuma, Kaku Yugo Gakkai-Shi, 69(10), p.1229 - 1241, 1993/10
no abstracts in English
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Nucl.Eng.Des., 102, p.225 - 228, 1987/00
Times Cited Count：5 Percentile：50.76(Nuclear Science & Technology)no abstracts in English
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Nucl.Eng.Des., 85, p.141 - 150, 1985/00
Times Cited Count：6 Percentile：64.6(Nuclear Science & Technology)no abstracts in English
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Nucl.Eng.Des., 77, p.117 - 129, 1984/00
Times Cited Count：11 Percentile：73.2(Nuclear Science & Technology)no abstracts in English
- coincidence measurements and its application to in-beam experiments; ; *; *; *
Proc.Int.Symp.on Nuclear Spectroscopy and Nuclear Interactions, p.8 - 9, 1984/00
no abstracts in English
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JAERI-M 83-186, 171 Pages, 1983/10
no abstracts in English
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JAERI-M 83-185, 44 Pages, 1983/10
no abstracts in English
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JAERI-M 83-101, 108 Pages, 1983/07
no abstracts in English
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Nucl.Eng.Des., 75, p.5 - 11, 1982/00
Times Cited Count：0 Percentile：0.02(Nuclear Science & Technology)no abstracts in English
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Transactions of the American Nuclear Society, 41, p.695 - 696, 1982/00
no abstracts in English
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JAERI-M 9665, 143 Pages, 1981/10
no abstracts in English
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JAERI-M 9405, 121 Pages, 1981/03
no abstracts in English
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JAERI-M 9404, 121 Pages, 1981/03
no abstracts in English
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JAERI-M 9403, 122 Pages, 1981/03
no abstracts in English
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JAERI-M 8887, 132 Pages, 1980/06
no abstracts in English
