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Journal Articles

Neutron diffraction of ice in hydrogels

Sekine, Yurina; Fukazawa, Tomoko*; Aizawa, Mamoru*; Kobayashi, Riki*; Chi, S.*; Fernandez-Baca, J. A.*; Yamauchi, Hiroki; Fukazawa, Hiroshi

Journal of Physical Chemistry B, 118(47), p.13453 - 13457, 2014/08

 Times Cited Count:1 Percentile:2.1(Chemistry, Physical)

Neutron diffraction patterns for deuterated poly-$$N$$,$$N$$,-dimethylacrylamide (PDMAA) hydrogels were measured from 10 to 300 K to investigate the structure and properties of water in the gels. Diffraction peaks observed below 250 K indicate the existence of ice in the hydrogels. Some diffraction peaks from the ice are at lower diffraction angles than those in ordinary hexagonal ice (Ih). These shifts in peaks indicate that the lattice constants of the $$a$$ and $$c$$ axes in the ice are about 0.29% and 0.3% higher than those in ice Ih, respectively. The results show that bulk low-density ice can exist in PDMAA hydrogels. The distortions in the lattice structure of ice imply significant interactions between water molecules and the surrounding polymer chains, which play an important role in the chemical and mechanical properties of the hydrogel.

Journal Articles

Effects of crosslinker density on the polymer network structure in poly-$$N$$,$$N$$-dimethylacrylamide hydrogels

Fukazawa, Tomoko*; Ikeda, Naohiro*; Tabata, Mayu*; Hattori, Masataka*; Aizawa, Mamoru*; Yunoki, Shunji*; Sekine, Yurina

Journal of Polymer Science, Part B; Polymer Physics, 51(13), p.1017 - 1027, 2013/07

 Times Cited Count:23 Percentile:67.39(Polymer Science)

JAEA Reports

Conceptual design study of small sodium cooled reactors; 300MWe modular reactor (Joint research)

Aizawa, Kosuke; Chikazawa, Yoshitaka; Usui, Shinichi; Konomura, Mamoru; Ando, Masato*

JAEA-Research 2007-042, 105 Pages, 2007/06

JAEA-Research-2007-042.pdf:3.64MB

Various conceptual design studies of sodium cooled small reactor have been performed in the feasibility study. In FY2005 study, a 300MWe modular reactor which adopts metal-fueled and 1 loop cooling system in order to pursues economical competitiveness was investigated. Transient analyses were performed to show core safety under the large pipe break accident that was found to be the severest accident in case of a 1 loop cooling system. From the analysis results, it was showed a possibility to maintain the core safety without the reactor scram. Transient analyses of the natural circulation decay heat removal system were also performed, and it was showed a possibility to maintain the core safety after the reactor scram. The in-vessel storage (IVS) was adopt to eliminate the ex-vessel storage and the design of the distribution flow adjustment device in IVS is studied. It was showed that the IVS could be introduced without modifying in the reactor design in FY2004. The rationalization of the fuel handling system is investigated taking advantage of co-location plant in which the reactor, the recycle plant and the fuel fabrication plant are co-located in a site. As a result of rationalization, the volume of the reactor building becomes 0.85 times as much as that of the design in FY2004.

JAEA Reports

Conceptual design study of Cu bonded steam generator; Pressurized crack propagation experiments at the room temperature

Chikazawa, Yoshitaka; Aizawa, Kosuke; Konomura, Mamoru

JAEA-Research 2006-007, 114 Pages, 2006/03

JAEA-Research-2006-007.pdf:15.6MB

In the feasibility study of commercialized fast reactor cycle systems of JAEA, we make a concept of a sodium cooled reactor without secondary sodium circuits. And a sodium cooled reactor with Cu bonded steam generator is one of promising concept has been investigated. In the FY2004 study, pressurized tube experiments using the 3$$times$$3 array specimen imitated the reference tube geometry are carried out aiming to clarify crack propagation behavior in the reference steam generator. Compared with the results of the bend experiments in the FY2003, it is understood that the crack initiation and the crack propagation are greatly obstructed by the effect of the specimen shape. The reference tube geometry was optimized to pursue the economic. As a result of optimization, the construction cost of reactor cooling system with Cu bonded steam generators is 0.7 times as much as that of an ordinary sodium cooled reactor with secondary sodium circuits. Condition for crack propagation in the reference tube geometry is analyzed by using the result of the bend experiments in the FY2003. From the results of the bend experiments and the analysis, it was understood that there was a possibility that the crack reaches the Cu layer. But, when the crack reaches the Cu layer, it was shown that the crack propagation stopped.

JAEA Reports

Study of Electro Magnetic Pump in a Sodium Cooled Reactor

Chikazawa, Yoshitaka; Aizawa, Kosuke; Konomura, Mamoru; Ara, Kuniaki

JNC TN9400 2005-044, 86 Pages, 2005/08

JNC-TN9400-2005-044.pdf:7.46MB

In the feasibility study of JNC, an intermediate heat exchanger with a mechanical pump aiming to reduce material mass and floor area has been investigated. In this study, as an alternative of the intermediate heat exchanger with a mechanical pump, adaptability of an intermediate heat exchanger with electro magnetic pumps is investigated.An intermediate heat exchanger with electro magnetic pumps for a medium scale sodium cooled reactor is designed. An electromagnetic analysis is performed to determine basic specifications of electro magnetic pumps. A 3-D flow analysis shows the flow stability of the electro magnetic pump outlet and the importance of flow guide.Furthermore, a magnetic field analysis of an electro magnetic flow meter is performed, it is confirmed possibility to apply the flow meter to the main cooling system.

Oral presentation

Conceptual design of a small metal fuel sodium cooled reactor enhancing economical potential

Chikazawa, Yoshitaka; Aizawa, Kosuke; Konomura, Mamoru; Shimakawa, Yoshio*; Sawa, Naoki*; Ando, Masato*

no journal, , 

no abstracts in English

Oral presentation

Pressurized crack propagation experiments in rectangle heat transfer tube of Cu bonded steam generator

Aizawa, Kosuke; Chikazawa, Yoshitaka; Konomura, Mamoru; Usui, Shinichi; Sherwood, D. V.*

no journal, , 

no abstracts in English

Patent

電磁流量計

荒 邦章; 此村 守; 近澤 佳隆; 相澤 康介

相澤 利枝*; 田口 淳三*; 香月 健治*; 竹島 徳幸*; 清水 武司*

JP, 2005-233186  Patent licensing information  Patent publication (In Japanese)

【課題】励磁装置の小型化を図ることができ、様々な断面形状の管路に適用することができる電磁流量計を提供する。 【解決手段】管路1を流れる導電性流体の流量計測を行う電磁流量計10である。管路外壁1Bと直交する磁界を形成するための励磁装置11と、上記磁界を導電性流体が横切ることにより発生する起電力を計測するための一対の電極2A,2Bとを有し、それら電極2A,2Bと励磁装置11の両磁極とが管路外壁1Bの片側に集約して配置されている。

Patent

DEBITMETRE ELECTROMAGNETIQUE

荒 邦章; 此村 守; 近澤 佳隆; 相澤 康介

相澤 利枝*; 田口 淳三*; 香月 健治*; 竹島 徳幸*; 清水 武司*

JP, 0601973  Patent licensing information  Patent publication (In Japanese)

L'invention concerne un debitmetre electromagnetique concu pour utiliser un dispositif d'excitation de dimensions reduites et capable d'effectuer une mesure sur des canaux tubulaires (1) de diverses formes en section. Le debitmetre electromagnetique (10) comporte un dispositif d'excitation (11) destine a produire un champ magnetique perpendiculaire a une paroi exterieure (1b) d'un canal tubulaire (1), et deux electrodes (2a et 2b) destinees a mesurer une force electromotrice generee par le mouvement du fluide electroconducteur a travers le champ magnetique. Les electrodes (2a, 2b) et les deux poles magnetiques du dispositif d'excitation (11) sont places ensemble sur la paroi exterieure (1b), sur un cote du canal tubulaire (1).Domaine d'application: surregenerateurs rapides, etc.

9 (Records 1-9 displayed on this page)
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