Refine your search:     
Report No.
 - 
Search Results: Records 1-13 displayed on this page of 13
  • 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

None

; ; *

JNC-TY7430 2000-001, 57 Pages, 2000/03

JNC-TY7430-2000-001.pdf:2.17MB

no abstracts in English

JAEA Reports

Compilation of Kinetic Data for Geochemical Calculations

Randolp*; David*; Sasamoto, Hiroshi; Shibata, Masahiro; Yui, Mikazu

JNC-TN8400 2000-005, 61 Pages, 2000/01

JNC-TN8400-2000-005.pdf:2.45MB

Kinetic data, including rate constants, reaction orders and activation energies, are compiled for 34 hydrolysis reactions involving feldspars, sheet silicates, zeolites, oxides, pyroxenes and amphiboles, and for similar reactions involving calcite and pyrite. The data are compatible with a rate law consistent with surface reaction control and transition-state theoly, which is incorporated in the geochemieal software package EQ3/6 and GWB. Kinetic data for the reactions noted above are strictly compatible with the transition-state rate law only under far-from-equilibrium conditions. It is possiblethat the data are conceptually consistent with this rate law under both far-from-equilibrium and near-to-equilibrium conditions, but this should be confirmed whenever possible through analysis of original experimental results, Due to limitations in the availability of kinetic data for mineral-water reactions, and in order to simplify evaluations of geochemical models of groundwater evolution, it is convenient to assume local-equilibrium in such models whenever possible. To assess whether this assumption is reasonable, a modeling approach accounting for coupled fluid flow and water-rock interaction is described that can be used to estimate spatial and temporal scale of local equiliblium. The approach is demonstrated for conditions involving groundwater flow in fractures at JNC's Kamaishi in-situ tests site, and is also used to estimate the travel time necessary for oxidizing surface waters to migrate to the level of a HLW repository in crystalline rock. The question of whether local equilibrium is a reasonable assumption must be addressed using an appropriate modeling approach. To be appropriate for conditions at the Kamaishi site using the modeling approach noted above, the fracture fill must closely approximate a porous medium, groundwater flow must be purely advective and diffusion of solutes across the fracture-host rock boundary must not occur. Moreover, the ...

JAEA Reports

Corrosion bihavior of carbon steel in high-temperature sodium compounds; Recommended equation for corrosion rate of the carbon steel in sodium compounds (Na$$_{2}$$O$$_{2}$$-NaOH System)

Yoshida, Eiichi; Aoto, Kazumi; ;

JNC-TN9400 2000-024, 42 Pages, 1999/10

JNC-TN9400-2000-024.pdf:1.63MB

For the purpose of improving the reliability of evaluation, the corrosion rate equation of the carbon steel SM400B (JIS G3106) in the high-temperature sodium compounds (NaOH-Na$$_{2}$$0$$_{2}$$ system) was revised. ln this revision, the data acquired after 1997 was used. Based on the experimental results, the evaluation was made to be an approach to the following; (1)Metal loss of carbon steel in NaOH-Na$$_{2}$$0$$_{2}$$ system was evaluated as increases in exposure to the time, which is linear rate law. (2)There were no significant effects of the experiment atmosphere and mixing speed of the reagent on corrosion rate. (3)The concentration of Na$$_{2}$$0$$_{2}$$ in sodium compound is considered for the evaluation. The concentration under experiment is made to be the over concentration necessary for maintaining the dominant reaction between Fe and Na$$_{2}$$20$$_{2}$$. As a result of the evaluation, the additional data are 67 points. The data for the revision of the evaluation equation became the total of 105 points, when existing data of 38 points were added. The statistical evaluation of 105 points was carried out, and following recommended equation was obtained. C$$_{R}$$ = C exp(-Q/RT) Where; C$$_{R}$$ : Corrosion rate, mm/h C : Material constant Q : Apparent activation energy, cal/mol R : Gas constant, 1.986 cal/mol K T ; Absolute temperature, K Q = 9.61 kcal/mol C = 148.29 (average), 262.11 (99% UCL), 83.90 (99% LCL)

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

JNC-TN1440 2000-002, 148 Pages, 1999/08

JNC-TN1440-2000-002.pdf:8.54MB

no abstracts in English

JAEA Reports

None

JNC-TN9200 99-007, 99 Pages, 1999/06

JNC-TN9200-99-007.pdf:5.34MB

None

JAEA Reports

None

Noda, Masaru*

JNC-TJ1400 99-035, 256 Pages, 1999/02

JNC-TJ1400-99-035.pdf:21.56MB

no abstracts in English

JAEA Reports

None

*; *; *; *; Morooka, Koichi*; *

JNC-TJ1400 99-025, 483 Pages, 1999/02

JNC-TJ1400-99-025.pdf:20.57MB

no abstracts in English

JAEA Reports

None

Nemoto, K.*; *; *; Endo, H.*; *; *; *

PNC-TJ1250 98-002, 321 Pages, 1998/02

PNC-TJ1250-98-002.pdf:25.88MB

None

JAEA Reports

Study on thermal transient strength evaluation method using cylindrical struetural test data; Proposal of an advanced creep-fatigue damage evaluation method and comparison with a conventional one for the prototype fast reactor

Kawasaki, Nobuchika; kasahara, Naoto

PNC-TN9410 96-294, 47 Pages, 1996/07

PNC-TN9410-96-294.pdf:1.5MB

As main components of fast reactors, there are reactor vessels, pipes, heat exchangers, nozzles. In order to keep their structural integrity, the elevated temperature structural design guide evaluates primary stress, strain, and creep-fatigue damage of them. Especially in fast reactors which operate under low pressure and high temperature conditions, creep-fatigue damage is dominant, and limits a design range. For the purpose of extending a design range, author evaluated strength of cylindrical structures by an advanced proposed method based on the generalized elastic follow-up model. Furthermore we studied evaluation accuracy of a method of 'monjyu" and a proposed method, through comparison of thermal transient strength test data with damage calculated by two strength evaluation methods. Results are summarized as follows. (1)An advanced proposed method predicted lower fatigue damage (Df) than a method of 'monjyu'. (However, in structural discontinuities where an elastic follow up is large, a proposed method shows higher damage than a method of 'monjyu'.) (2)An advanced proposed method calculated lower creep damage (Dc) than a method of 'monjyu'. (About 0.7 times lower in a cylindrical structure with a structural discontinuity (STF-3). About 0.1 times lower in a cylindrical structure without a structural discontinuity (STF-10). (3)On no-crack portions in STF-3, prediction of a method of 'monjyu' is out of a limit of crack initiation, nevertheless one of an advanced proposed method is within the range. Through above results, an advanced proposed method was evaluated to be more accurate in prediction of creep-fatigue damage. We concluded from the above investigation that we calculated more rational and lower damage by proposed method, and it has the possibilities to get extension of a design range.

JAEA Reports

None

; ;

PNC-TN9410 91-143, 69 Pages, 1991/05

PNC-TN9410-91-143.pdf:4.07MB

None

JAEA Reports

None

*

PNC-TN1420 91-001, 258 Pages, 1990/11

PNC-TN1420-91-001.pdf:9.24MB

no abstracts in English

Journal Articles

A Multivariable autoregressive model of the dynamics of a boiling water reactor

; ; *

Nuclear Science and Engineering, 65, p.1 - 16, 1978/00

no abstracts in English

13 (Records 1-13 displayed on this page)
  • 1