Refine your search:     
Report No.
 - 
Search Results: Records 1-19 displayed on this page of 19
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Degradation studies on granite in alkaline solution

Owada, Hitoshi*; ; *; *

JNC-TN8400 2000-027, 19 Pages, 2000/08

JNC-TN8400-2000-027.pdf:0.75MB

Bactch leaching experiments of granite with the artifitial cement leachate and the leachate of low-alkalinity-cement (LW) were carried out to evaluate the effect of the hiperalkaline plume on the environment of the high-level and TRU radioactive waste repository. Dissolution of Si and Al from feldspar included in the granite and precipitation of C-S-H were confirmed from the results of the leaching experiments with artifitial cement leachate. From this result it was found that the composition of sorrounding rock changed. It also suggested that the retardation factor of migration of radionuclides would change. On the contrary, only decrease of concentrations in Si, Al and Ca in the leachate was observed in the experiment with LW. This result might indicate that C-S-H and/or C-A-S-H precipitated as secondary minerals in the LW case. From these results, it was considered that the hiperalkaline plume from the cementitious leachate might caused the change of disposal conditions such as the change in distribution coefficients of rock by precipitation of the secondary mineral and the increase in hydraulic conductivity by the dissolution of rock. On the other hand, the influences of the LW would be comparatively small, because LW and granite might equilibrate in short time.

JAEA Reports

Effect of leachate of cementitious materials on the geological media; Experimental study of the influence of high pH plume on rock

Kato, Hiroshige*; *; Owada, Hitoshi*; ;

JNC-TN8430 2000-008, 53 Pages, 2000/05

JNC-TN8430-2000-008.pdf:3.56MB

Cementitious materials will be used in TRU waste disposal repository. In such cases, it is considered that the migration of alkaline leachates from cementitious materials, so called high pH plume, will cause dissolution of rock and precipitation of secondary minerals. In addition, the high pH plume will move along the flow of groundwater, so it is predicted that rock formation and components of high pH groundwater vary with time and space. However, time and spatial dependence of the variations of secondary minerals and groundwater components has not been clarified. In order to acquire the data of variations of secondary minerals and groundwater components, we carried out the rock alteration experiments with column method. The crushed granodiorite was filled into 4 meters length column ($$phi$$3.7 cm) and artificial cement leachate (pH=13.3; Na=0,1 mol/l, K=0.1 mol/l, Ca=0.002 mol/l) was streamed at flow rates of 0.1 ml/min for 7 months at 80$$^{circ}$$C. As the result, secondary minerals confirmed on the rock were calcite and C-S-H at upstream of column and C-S-H at mid-downstream. The pH value of the fluid dominated by Na and K did not be decreased by reaction with the rock. In this study, the data relating to the effect of high pH plume on rock over the long term was acquired.

JAEA Reports

MA transmutation in various fast reactor core concepts

; Iwai, Takehiko*; Jin, Tomoyuki*

JNC-TN9400 2000-080, 532 Pages, 2000/03

JNC-TN9400-2000-080.pdf:14.98MB

Transmutation Property of minor actinide nuclides (MA) was analyzed for fast reactor cores having different coolant and fuel types in order to obtain basic data for evaluating an ability of the efficient use of resource and reducing the effect on the environment. The investigated fast reactor cores were (a) sodium cooled and oxide fueled core, (b) lead cooled and nitride fueled core (BREST-300), (c) carbon dioxide gas cooled and oxide fueled core (ETGBR), (d)lead cooled and oxide fueled core, (e) sodium cooled and nitride fueled core (both He-bond and sodium-bond), and (f) sodium cooled and metallic fueled core. Followings were observed for the relation between MA transmutation property and the different types of coolant and fuel of fast reactor core. (1) For the MA transmutation rate, the relation "Oxide $$<$$ Metal $$<$$ Nitride" was found out for difference of fuel type. A main reason of the increment of MA transmutation rate is that the neutron flux level rises on nitride and metallic fueled cores in comparison with oxide core. (2) The relation "Lead $$<$$ Sodium and Carbon dioxide" can be seen for the MA transmutation rate in the difference of coolant, but it is not clear whether the cause is driven from the difference of coolant itself on the difference of core design. (3) The changes of MA transmutation property mentioned above are comparatively small.

JAEA Reports

None

JNC-TN1440 2000-003, 88 Pages, 1999/08

JNC-TN1440-2000-003.pdf:5.11MB

no abstracts in English

JAEA Reports

None

PNC-TJ1533 98-003, 105 Pages, 1998/02

PNC-TJ1533-98-003.pdf:3.51MB

no abstracts in English

JAEA Reports

None

PNC-TN1410 97-041, 29 Pages, 1997/11

PNC-TN1410-97-041.pdf:1.35MB

no abstracts in English

JAEA Reports

None

PNC-TJ1615 97-001, 5 Pages, 1997/03

PNC-TJ1615-97-001.pdf:0.32MB

no abstracts in English

JAEA Reports

None

PNC-TJ1533 97-002, 133 Pages, 1997/03

PNC-TJ1533-97-002.pdf:4.28MB

no abstracts in English

JAEA Reports

None

PNC-TJ1621 96-001, 80 Pages, 1996/03

PNC-TJ1621-96-001.pdf:2.34MB

no abstracts in English

JAEA Reports

None

PNC-TJ1533 96-005, 199 Pages, 1996/03

PNC-TJ1533-96-005.pdf:7.37MB

no abstracts in English

JAEA Reports

None

PNC-TJ1211 95-008, 392 Pages, 1995/02

PNC-TJ1211-95-008.pdf:10.83MB

1)永井忠雄、木内弘道、"黄鉄鉱の酸素加圧浸出に関する研究"、北海道大学工学部研究報告、No.48、pp.13-23、1968.2)R.S.Schechter,L.W.Lake,et al.,"Developmen- of environmentally attractive leachants.Volume 2. An experimental and theoretical study of uranium and pyrite dissolution kinetics.",BuMines-OFR-141-84,p.93,1984.3)A.F.Umana,"Kinetics of oxidative dissolution of pyrite by aqueous chlorine species.",Dissertation for doctorate,Standford Univ.,1980.4)V.S.T.Ciminelli, K.Osseo-Asare,"Kinetics of pyrite oxidation by oxygen in sodium carbonate solution.",Hydrometall.React.Des.Kinet.,Proc.Symp.,pp.129-147,1986.5)K.Osseo-Asare,"Pyrite in aqueous systems : semiconductor properties,oxidative dissolution,and environmental control.",Int. Conf.Process.Mater.Prop.(conference proceeding),pp.83-89,1993.6)酒井昇、石先千春、他、第二鉄イオンによる黄鉄鉱の溶解速度"、日本鉱業会誌、103、1192、pp.395-400、1987.7)Same as 2),p.68,1984.8)M.Pourbaix,"Atlas of electrochemical equilibria in aqueous solution.",Pergamon Press,1966.9)Same as 2),p.70,1984.10)H.K.Lin,H.Y.Sohn,et al.,"The kinetice o

JAEA Reports

None

; Sumiya, Shuichi;

PNC-TN8450 94-006, 28 Pages, 1994/12

no abstracts in English

JAEA Reports

None

PNC-TN8440 94-057, 125 Pages, 1994/09

PNC-TN8440-94-057.pdf:3.13MB

None

JAEA Reports

Analytical result of weather data observed at PNC Tokai Works respect to atmospheric stability classification

Narita, Osamu; ; ; Kano, Yutaka;

PNC-TN8420 94-017, 91 Pages, 1994/06

PNC-TN8420-94-017.pdf:1.62MB

We enforce weather observation at PNC Tokai Works from 1960's. We have been equipping with weather observation devices and tower from around 1974, for the purpose of environment influence evaluation resulted from radioactive waste which is discharged the atmosphere uses from reprocessing plant. Weather data observed before now are utilize for several kinds of classification way of atmospheric stability. So we compared them with a tendency of frequency distribution of atmospheric stability using each classification way. A tendency of frequency distribution of way using lapse late alone are different from one of way using weather regulatory guide classification. But a similar tendency was looked at frequency distribution of way using weather regulatory guide classification and one of way using wind speed combined with lapse late. we analized and compared with each classification way of atmospheric stability on the basis of a large quantity data observed for 10 years and we grasped a characteristic of classification way and observation site. The lapse late observation that is observed for the purpose of reference to diffusion parameter estimate and other weather observations with the view of investigation of atmospheric stability accomplished their objects. And we conclude that thier weather observation wound up for the resent.

JAEA Reports

None

PNC-TJ1545 93-001, 169 Pages, 1993/03

PNC-TJ1545-93-001.pdf:5.76MB

no abstracts in English

JAEA Reports

None

;

PNC-TN8440 93-007, 103 Pages, 1992/12

PNC-TN8440-93-007.pdf:2.55MB

None

JAEA Reports

None

PNC-TJ1609 92-003, 54 Pages, 1992/03

PNC-TJ1609-92-003.pdf:1.63MB

None

JAEA Reports

None

Matsumoto, Shiro*

PNC-TJ1609 91-002, 48 Pages, 1991/03

PNC-TJ1609-91-002.pdf:1.66MB

no abstracts in English

JAEA Reports

None

Matsumoto, Shiro*

PNC-TJ1533 91-001, 160 Pages, 1991/03

PNC-TJ1533-91-001.pdf:5.15MB

no abstracts in English

19 (Records 1-19 displayed on this page)
  • 1