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Nemoto, Takahiro; Fujiwara, Yusuke; Arakawa, Ryoki; Choyama, Yuya; Nagasumi, Satoru; Hasegawa, Toshinari; Yokoyama, Keisuke; Watanabe, Masashi; Onishi, Takashi; Kawamoto, Taiki; et al.
JAEA-Technology 2024-003, 17 Pages, 2024/06
In order to investigate the cause of the increase in differential pressure in the primary helium circulator filter that occurred during the RS-14 cycle, a clogged filter was investigated. As a result of the investigation, deposits caused by silicone oil were confirmed on the surface of the filter element. These results revealed that the cause of filter clogging was silicone oil mixed into the primary system due to performance deterioration of the charcoal filter in the gas circulator of primary helium purification system. As a measure to prevent the recurrence of this event, in addition to the conventional management based on operating hours for replacing of charcoal filter in the gas circulator of primary helium purification system, we have established a new replacement plan for every three years.
Nemoto, Takahiro; Arakawa, Ryoki; Kawakami, Satoru; Nagasumi, Satoru; Yokoyama, Keisuke; Watanabe, Masashi; Onishi, Takashi; Kawamoto, Taiki; Furusawa, Takayuki; Inoi, Hiroyuki; et al.
JAEA-Technology 2023-005, 33 Pages, 2023/05
During shut down of the HTTR (High Temperature engineering Test Reactor) RS-14 cycle, an increasing trend of filter differential pressure for the helium gas circulator was observed. In order to investigate this phenomenon, the blower of the primary helium purification system was disassembled and inspected. As a result, it is clear that the silicon oil mist entered into the primary coolant due to the deterioration of the charcoal filter performance. The replacement and further investigation of the filter are planning to prevent the reoccurrence of the same phenomenon in the future.
Hidaka, Akihide
Nuclear Technology, 208(2), p.318 - 334, 2022/02
Times Cited Count:6 Percentile:69.63(Nuclear Science & Technology)The author previously proposed that the Cs bearing microparticle (Type A) may have been formed by melting and atomization of glass fibers (GF) of the HEPA filter in the SGTS due to flame and blast during the hydrogen explosion in Unit 3. If this hypothesis is correct, the Type A could contain or accompany carbon (C), that ignites spontaneously above 623 K, because of the limited time to be heated up, inclusion of C in the binder applied on the GF surface and closely located charcoal filter. As the previous studies did not focus on C, the present analyses were performed with EPMA whether the Type A contains C. The results showed that the Type A contained C originating from the binder, and non-spherical particles accompanied by the Type A and the film surrounding the Type A contained more C, which is thought to originate from the charcoal filter. These results cannot be explained by the other mechanisms proposed so far, and can be explained consistently by the author proposed hypothesis.
Ono, Ayako; Suzuki, Takayuki*; Yoshida, Hiroyuki
Proceedings of 26th International Conference on Nuclear Engineering (ICONE-26) (Internet), 6 Pages, 2018/07
The mechanism of critical heat flux (CHF) for higher system pressure remains to be clarified, even though it is important to evaluate the CHF for the light water reactor (LWR) which is operated under the high pressure condition. In this study, the process of bubble coalescence was simulated by using a computational multi-fluid dynamics (CMFD) simulation code TPFIT under various system pressure in order to investigate the behavior of bubbles as a basic study. The growth of bubbles was simulated by blowing of vapor from a tiny orifice simulating bubble bottom. One or four orifices were located on the bottom surface in this simulation study. The numerical simulations were conducted by varying the pressure and temperature.
Pospisil, J.; Opletal, P.*; Valika, M.*; Tokunaga, Yo; Stunault, A.*; Haga, Yoshinori; Tateiwa, Naoyuki; Gillon, B.*; Honda, Fuminori*; Yamamura, Tomoo*; et al.
Journal of the Physical Society of Japan, 85(3), p.034710_1 - 034710_10, 2016/03
Times Cited Count:9 Percentile:55.09(Physics, Multidisciplinary)Fu, F.; Akagi, Tasuku*; Suzuki, Yuichiro*; Watanabe, Kazuo; Yabuki, Sadayo*
Geochemical Journal, 38(4), p.333 - 343, 2004/08
Times Cited Count:9 Percentile:20.21(Geochemistry & Geophysics)no abstracts in English
Inaba, Yoshitomo; Fumizawa, Motoo*; Tonogochi, Makoto*; Takenaka, Yutaka*
Applied Energy, 67(4), p.395 - 406, 2000/12
Times Cited Count:10 Percentile:49.99(Energy & Fuels)no abstracts in English
Onuki, Akira; Akimoto, Hajime
Proceedings of 2nd Japanese-European Two-Phase Flow Group Meeting (CD-ROM), 6 Pages, 2000/00
no abstracts in English
Sakaba, Nariaki; Emori, Koichi; Saruta, Toru
JAERI-Tech 99-072, p.125 - 0, 1999/10
no abstracts in English
Inaba, Yoshitomo; Fumizawa, Motoo; Hishida, Makoto*; ; Takenaka, Yutaka*; Tonogochi, Makoto*
JAERI-Tech 96-057, 132 Pages, 1997/01
no abstracts in English
Inaba, Yoshitomo; Fumizawa, Motoo; Hishida, Makoto; Ogawa, Masuro; Aritomi, Masanori*; Kozaki, Yasutsugu*; ; ; ; ; et al.
JAERI-Tech 96-019, 122 Pages, 1996/05
no abstracts in English
Inaba, Yoshitomo; Fumizawa, Motoo; Hishida, Makoto; Ogawa, Masuro; ; Aritomi, Masanori*; Kozaki, Yasutsugu*; ; ; ; et al.
JAERI-Review 96-007, 87 Pages, 1996/05
no abstracts in English
Okubo, Makio
Physical Review C, 53(3), p.1325 - 1335, 1996/03
Times Cited Count:6 Percentile:38.03(Physics, Nuclear)no abstracts in English
Ikezawa, Yoshio
Saikin No Kenkyu Shisetsu, 0, p.304 - 311, 1995/00
no abstracts in English
Ikezawa, Yoshio
Kurin Tekunoroji, 3(4), p.41 - 45, 1993/04
no abstracts in English
; ; ; ;
Nihon Genshiryoku Gakkai-Shi, 27(3), p.250 - 261, 1985/00
Times Cited Count:13 Percentile:81.89(Nuclear Science & Technology)no abstracts in English
Motoki, Ryozo; ; ; Motoishi, Shoji; ; ; ;
JAERI-M 84-015, 34 Pages, 1984/02
no abstracts in English
; ; ; ; ;
Hoken Butsuri, 17, p.427 - 436, 1982/00
no abstracts in English
; ; ; ;
Nucl.Eng.Des., 74(2), p.199 - 213, 1982/00
Times Cited Count:1 Percentile:22.46(Nuclear Science & Technology)no abstracts in English
; ; ; ;
JAERI-M 9246, 46 Pages, 1981/01
no abstracts in English