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Iriya, Keishiro*; *; Fujita, Hideki*; Kubo, Hiroshi*
JNC TJ8400 2000-034, 212 Pages, 2000/02
JNC-TJ8400-2000-034.pdf:7.91MB
Cementious materials and highly compacted bentnite are expectable candidates as materials of TRU waste repositories. It was pointed out that Bentonite might be changed to Zeolite and surrounding rock might be altered by high alkalinity water flow, since cement hydrate leached to pore water of cement and it was changed to alkaline. Transportation of radio-nuclides might be accelerated by organic materials, such as super plasticizer, and nitlate which is contained in nuclear wastes. It was concluded by previous studies that rock and bentonite is stable in alkaline water which pH is less than 10.5. The new type of low alkalinity cement with high silica fume and fly ash content which could keep pH below 11.0 was developed and its performance has been assessed. However since Zeolitation and ilitation were reported upon deterioration of bentonite bated in certain condition, it should be assessed by long term experiment. Since Capacity of keeping integrity of bentonite hasn't been directly checked by experiments upon the developed new type of low alkalinity cement it should be done. Although amount of leaching organic was quantitatively and experimentally assessed at an early age, effect of changing of amount and shape hasn't assessed in leaching of radio nuclides. Although it is pointed out that deterioration of cementitious materials isn't accelerated by condensed nitrate solution at early period after closure, it is considered that it might be accelerated corresponding to chemical composition in case of decrement of concentration of nitrate. In this study, deterioration of materials will be assessed in detail in order to feed back the results to assessment of transportation of radio nuclides. Long term deterioration of bentonite by leaching water of cement will be experimentally assessed, and deteriorating test of bentonite will be carried out by leaching water of low alkalinity cement. Amount of organic and component of it will be measured. Furthermore ...
Iriya, Keishiro*; *; Kubo, Hiroshi*; Fujita, Hideki*
JNC TJ8400 2000-033, 95 Pages, 2000/02
JNC-TJ8400-2000-033.pdf:11.11MB
Cementious materials and highly compacted bentnite are expectable candidates as materials of TRU waste repositories. It was pointed out that Bentonite might be changed to Zeolite and surrounding rock might be altered by high alkalinity water flow, since cement hydrate leached to pore water of cement and it was changed to alkaline. Transportation of radio-nuclides might be accelerated by organic materials, such as super plasticizer, and nitrate which is contained in nuclear wastes. It was concluded by previous studies that rock and bentonite is stable in alkaline water which pH is less than 10.5. The new type of low alkalinity cement with high silica fume and fly ash content which could keep pH below 11.0 was developed and its performance has been assessed. However since Zeolitation and ilitation were reported upon deterioration of bentonite bated in certain condition, it should be assessed by long term experiment. Since Capacity of keeping integrity of bentonite hasn't been directly checked by experiments upon the developed new type of low alkalinity cement it should be done. Although amount of leaching organic was quantitatively and experimentally assessed at an early age, effect of changing of amount and shape hasn't assessed in leaching of radio nuclides. Although it is pointed out that deterioration of cementitious materials isn't accelerated by condensed nitrate solution at early period after closure, it is considered that it might be accelerated corresponding to chemical composition in case of decrement of concentration of nitrate. In this study, deterioration of materials will be assessed in detail in order to feed back the results to assessment of transportation of radio nuclides. Long term deterioration of bentonite by leaching water of cement will be experimentally assessed, and deteriorating test of bentonite will be carried out by leaching water of low alkalinity cement. Amount of organic and component of it will be measured. Furthermore ...
Toyama, Shigeyuki*; Wakamatsu, Hisanori; Okazaki, Hikoya
JNC TJ7440 99-031, 22 Pages, 1999/09
no abstracts in English
Tsukada, Takashi
JAERI-Research 98-007, 187 Pages, 1998/03
JAERI-Research-98-007.pdf:17.46MB
no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.1337 - 1338, 1995/00
no abstracts in English
Suzuki, Masahide;
JAERI-Research 94-038, 23 Pages, 1994/11
JAERI-Research-94-038.pdf:0.87MB
no abstracts in English
CsUeno, Takashi; Amano, Hikaru; Kobayashi, Yoshii
Hoken Butsuri, 29(1), p.17 - 22, 1994/03
no abstracts in English
Muramatsu, Ken
Nihon Genshiryoku Gakkai-Shi, 36(5), p.387 - 390, 1994/00
no abstracts in English
; ; ; Isozaki, Tokuju;
PNC TN8450 93-004, 144 Pages, 1993/06
Generally speaking, two kinds of water plumes which have different temperature, salinity and so on are not easily mixturred and have special boundary. So, it is possible to predict ocurrence of special boundary of sea water from observation of temperature, salinity of sea water. Not only marine environmental monitoring such as radioactivity analysis of sea water, sea-bed sediment, marine products but also observation of water current, water direction, surface and ventical observation of water temperature, salinity and so on in Tokai coastal area are carried out with some observation instruments by Environmental Protection Section, Tokai Works, PNC. The results of vertical observation from 1990 to 1991 are recorded in this report.
Kawamura, Kazuo*; Nakajima, Tatsuya*; Tomori, Masahiko*
PNC TJ7361 93-004, 91 Pages, 1993/03
no abstracts in English
Shirai, Eiji; Soyama, Kazuhiko
Genshiryoku Kogyo, 39(11), p.48 - 53, 1993/00
no abstracts in English
test section in HENDELIoka, Ikuo; *; Inagaki, Yoshiyuki; *; ; Suzuki, Kunihiro;
JAERI-M 90-221, 21 Pages, 1990/12
no abstracts in English
Onizawa, Kunio; ; ;
JAERI-M 90-202, 33 Pages, 1990/11
no abstracts in English
Ikeuchi, Hirotomo; Yano, Kimihiko; Watanabe, Masayuki; Koizumi, Kenji
no journal, ,
no abstracts in English
Suzuki, Seiya; Yano, Kimihiko; Watanabe, Masayuki; Koizumi, Kenji
no journal, ,
no abstracts in English
Suzuki, Seiya; Yano, Kimihiko; Watanabe, Masayuki; Koizumi, Kenji
no journal, ,
no abstracts in English
Suzuki, Seiya; Yano, Kimihiko; Okamura, Nobuo; Watanabe, Masayuki
no journal, ,
no abstracts in English
Suzuki, Seiya; Arai, Yoichi; Okamura, Nobuo; Watanabe, Masayuki
no journal, ,
Clarification of aging phenomenon of fuel debris is one of the important issues because to evaluate that the safety during long term at defueling and storing. As a physical mechanism, we were investigated the effect of environmental temperature on the amount of cracks increased, and clarified the behavior of crack generation and propagation in submerged fuel debris.
