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Morishita, Kazuki; Sato, Takumi; Onishi, Takashi; Seki, Takayuki*; Sekine, Shinichi*; Okitsu, Yuichi*
JAEA-Technology 2021-024, 27 Pages, 2021/10
JAEA-Technology-2021-024.pdf:2.41MB
In the case of Plutonium (Pu)-bearing organic materials, organic materials are decomposed by alpha rays emitted mainly from Pu to generate hydrogen gas and other substances. Therefore, to safely store Pu-bearing organic materials for an extended period of time, organic materials must be eliminated. In addition, carbide and nitride fuels must be converted into oxides for safe storage in order to prevent the exothermal reaction of these fuels with oxygen/moisture in air. A survey of the literature on the stabilization treatment of Pu-bearing organic materials confirmed that organic materials can be decomposed and removed by heating at 950 
C (1223.15 K) or greater in air. Furthermore, based on the calculated thermodynamic parameters of oxidation reaction of carbide and nitride fuels in air, it was estimated that these fuels would be oxidized in air at 950 C because the equilibrium oxygen partial pressure in the oxidation reaction at 950 C was lower than 2.1
10
Pa (oxygen partial pressure in air). Therefore, it was decided to stabilize Pu-bearing organic materials by heating at 950 C in air to remove the organic materials and oxidize the carbide and nitride fuels. As a mock-up test to remove the organic materials, thin sheets of epoxy resin were heated in air. The changes in appearance and weight before and after heating in air showed that organic materials can be removed. After the mock-up test, Pu-bearing organic materials were also stabilized by heating in the similar condition.
Cause Investigation Team for the PFRF Contamination Incident
JAEA-Review 2017-038, 83 Pages, 2018/03
JAEA-Review-2017-038.pdf:11.37MB
The contaminated accident occurred at Plutonium Fuel Research Facility on June, 2017. The PVC bag packaging in a fuel storage container burst when a worker opened the lid, and a part of contents (uranium and plutonium) was spattered over the room. In order to clarify the cause of the burst, the Cause Unfolding Team collected information concerning characteristics of the contents from any past records and interview. And then we observed and analyzed the contents in a glove box. We also performed experiments on radiolysis of organic materials, degradation of PVC bag by 
radiation, and PVC bag burst. Based on fault tree analysis, finally we concluded that the main gas generation source was alpha radiolysis of the epoxy resin mixed with the fuel powder. We hope that the calculation procedures for the gas generation and the inner pressure transition described in this report can be useful reference for the management of fuel storage in other facilities.
Fukumoto, Masahiro; Nishikawa, Yoshiaki*
JNC TN8400 2001-017, 355 Pages, 2001/03
JNC-TN8400-2001-017.pdf:6.43MB
The alkali hydrolysis experiments which seem to be important from the view point of the alteration mechanism using the following seven organic materials was performed as a part of the evaluation of the influence on the disposal of the organic materials contained in the TRU wastes. As a result of the alkali hydrolysis experiments (90C and 91d), each organic materials became those of lower molecular weight. The degradation products were able to be detected in the solution. The organic materials seem to be degraded to the organic matters which were confirmed in this study in a long term of disposal. The degradation products were shown below. Therefore, the evaluation of the influence on the migration of radionuclides by degradation products becomes important in the future. (1)Cement additives of Naphthalenesulfonic acid and Ligninsulfonic acid (
Naphthalenedisulfonic acid etc.) (2)Cement additives of polycarboxylic acid ( Oligomer of distal methoxypoly ethylene glycol.) (3)Ethylenediamine-N,N,N',N'-tetraacetic acid disodium salt ( Acetic acid desorped and cyclized organic matters from EDTA.) (4)Tributyl phosphate ( Dibutyl phthalate, n-butanol) (5)Poly vinyl acetate ( Acetic acid) (6)Nylon66 ( Adipic acid, Hexamethylenediamine) (7)Cured epoxy resin ( Glycerol poly glycidyl ether, Carboxylic acid)
Udagawa, Akira; *; *; *; Seguchi, Tadao
JAERI-Tech 99-022, 31 Pages, 1999/03
no abstracts in English
Egusa, Shigenori; *
Smart Mater. Struct., 7, p.438 - 445, 1998/00
Times Cited Count：57 Percentile：93.57(Instruments & Instrumentation)no abstracts in English
Egusa, Shigenori
Boundary, 12(8), p.7 - 11, 1996/08
no abstracts in English
Egusa, Shigenori; *
Journal of Applied Physics, 78(10), p.6060 - 6070, 1995/11
Times Cited Count：22 Percentile：72.26(Physics, Applied)no abstracts in English
*; Akutsu, Yoichi; Okawa, Yoshinao; *; Suzuki, Hideyuki
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu, 0, p.171 - 172, 1994/00
no abstracts in English
Egusa, Shigenori; *
Proc. of the 2nd Int. Conf. on Intelligent Materials, 0, p.486 - 497, 1994/00
no abstracts in English
Egusa, Shigenori; *
Ferroelectrics, 145, p.45 - 60, 1993/00
no abstracts in English
Egusa, Shigenori; *
J. Mater. Sci., 28, p.1667 - 1672, 1993/00
Times Cited Count：60 Percentile：90.55(Materials Science, Multidisciplinary)no abstracts in English
Egusa, Shigenori; *
Proc. of the 7th Int. Conf. on Solid-state Sensors and Actuators, p.976 - 979, 1993/00
no abstracts in English
Hiue, Hisaaki*; Sugimoto, Makoto; Nakajima, Hideo; Hasegawa, Mitsuru*; Yasukawa, Yukio*; Yoshida, Kiyoshi; *; *
JAERI-M 92-127, 33 Pages, 1992/09
no abstracts in English
-radiation damage of electrical insulated reinforcing barAkutsu, Yoichi; Okawa, Yoshinao; Suzuki, Hideyuki; *; *; *
Nihon Kenchiku Gakkai Taikai Gakujutsu Koen Kogaishu; Hokuriku, p.1043 - 1044, 1992/08
no abstracts in English
Udagawa, Akira
Kobunshi Rombunshu, 49(6), p.551 - 553, 1992/06
Times Cited Count：2 Percentile：21.32(Polymer Science)no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; ; *
Konkurito Kogaku Rombunshu, 3(1), p.65 - 76, 1992/01
no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; *; *
Konkurito Kogaku Nenji Rombun Hokokushu, 14(1), p.775 - 776, 1992/00
no abstracts in English
Akutsu, Yoichi; Okawa, Yoshinao; *; *
Transactions of the Japan Concrete Institute,Vol. 14, p.217 - 230, 1992/00
no abstracts in English
Egusa, Shigenori; Sugimoto, Makoto; Nakajima, Hideo; Yoshida, Kiyoshi; Tsuji, Hiroshi
SMiRT 11 Transactions,Vol. L, p.301 - 306, 1991/08
no abstracts in English
Egusa, Shigenori
Cryogenics, 31, p.7 - 15, 1991/01
Times Cited Count：6 Percentile：49.06(Thermodynamics)no abstracts in English
