• Nuclear Engineering and Technology
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• v.40 no.5
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• pp.429-438
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• 2008

The objective of the present study is the depth and layout optimizations of a single layer, high level radioactive waste repository in a discontinuous rock mass with special joint set arrangements. A single layer repository model, considering variations in the repository depths, pitches, and tunnel spacings, is used to analyze the thermomechanical interaction behavior. It is assumed that the repository is constructed in saturated granite with joints; the PWR spent fuel in a disposal canister is installed in a deposition drift which is then sealed with compacted bentonite; and the backfill material is filled in the repository tunnel. The decay heat generated by the high level radioactive wastes governs the thermomechanical behavior of the near field rock mass of the repository. The temperature and displacement behavior of the repository is influenced more by the pitch variations than the tunnel spacing and repository depth. However, the stress behavior is influenced more by the repository depth variations than the pitch and tunnel spacing. For the final selection of the tunnel spacing, pitch, and repository depth, other aspects such as the nuclide migration through a groundwater flow path, construction costs, operation costs, and so on should be considered.

• Journal of the Korean Home Economics Association
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• v.36 no.2
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• pp.1-18
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• 1998

The purpose of this study is to investigate some influencing factors related to housewives' environmental concern and environmental management behavior. Data were collected from questionaire with 786 housewives who live in Jeonbuk area. The results could be summarized as follows. The level of environmental concern was relatively high and differed significantly according to the level of innovation, residence, the level of education, and age of wives. But the level of environmental management behavior was relatively low, especially clothing disposal behavior and buying something to eat. These findings pointed that the program of environmental education should be more pragmatic.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.19 no.4
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• pp.503-515
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• 2021

In this study, rainfall infiltration in vault of the second near-surface disposal facility was evaluated on the basis of various disposal scenarios. A total of four different disposal scenarios were examined based on the locations of the radioactive waste containers. A numerical model was developed using the FEFLOW software and finite element method to simulate the behavior of infiltrated water in each disposal scenario. The effects of the disposal scenarios on the infiltrated water were evaluated by estimating the flux of the infiltrated water at the vault interfaces. For 300 years, the flux of infiltrated water flowing into the vault was estimated to be 1 mm/year or less for all scenario. The overall results suggest that when the engineered barriers are intact, the flux of infiltrated water cannot generate a sufficient pressure head to penetrate the vault. In addition, it is confirmed that the disposal scenarios have insignificant effects on the infiltrated water flowing into the vault.

• Nuclear Engineering and Technology
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• v.38 no.6
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• pp.459-482
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• 2006

A geochemical approach to the long-term safety of waste disposal is discussed in connection with the significance of actinides, which shall deliver the major radioactivity inventory subsequent to the relatively short-term decay of fission products. Every power reactor generates transuranic (TRU) elements: plutonium and minor actinides (Np, Am, Cm), which consist chiefly of long-lived nuclides emitting alpha radiation. The amount of TRU actinides generated in a fuel life period is found to be relatively small (about 1 wt% or less in spent fuel) but their radioactivity persists many hundred thousands years. Geological confinement of waste containing TRU actinides demands, as a result, fundamental knowledge on the geochemical behavior of actinides in the repository environment for a long period of time. Appraisal of the scientific progress in this subject area is the main objective of the present paper. Following the introductory discussion on natural radioactivities, the nuclear fuel cycle is briefly brought up with reference to actinide generation and waste disposal. As the long-term disposal safety concerns inevitably with actinides, the significance of the aquatic actinide chemistry is summarized in two parts: the fundamental properties relevant to their aquatic behavior and the geochemical reactions in nanoscopic scale. The constrained space of writing allows discussion on some examples only, for which topics of the primary concern are selected, e.g. apparent solubility and colloid generation, colloid-facilitated migration, notable speciation of such processes, etc. Discussion is summed up to end with how to make a geochemical approach available for the long-term disposal safety of nuclear waste or for the performance assessment (PA) as known generally.

• Korean Journal of Human Ecology
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• v.13 no.4
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• pp.569-579
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• 2004

This study categorizes consumers by the style of consumers' purchase behavior, and examines the differences in consumers' attitudes toward environment and pro-environmental behavior in the stage of purchase, usage, and disposal. The results of this study are summarized below: First, The style of consumers' purchase behavior can be categorized on a basis of four factors: fashioned-demonstrative consumer group focusing on fashion and demonstration effects when purchasing; rational consumer group more likely to concern price, quality, and product function; indifferent consumer group having no interest in purchasing; and fashioned-functional consumer group who values not only fashion but function. Second, the result of investigating the differences of consumers' attitudes toward environment reveals that the level of concern and awareness for environment is highest in rational consumer group, but lowest in indifferent consumer group. Also, it is higher in fashioned-functional consumer group than in fashioned-demonstrative consumer group. Lastly, the level of pro-environmental behavior in the stage of purchase, usage, and disposal is highest in rational consumer group, but lowest in indifferent consumer group. The level of pro-environmental behavior in usage stage is inactive in fashioned-demonstrative consumer group, whereas that in disposal stage is active in fashioned-functional consumer group for fashioned-demonstrative consumer group. It was so, especially in the area of not-being-a-litterbug.

• Resources Recycling
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• v.24 no.5
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• pp.40-55
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• 2015

The purpose of this study is to analyse whether the waste disposal volume level in the construction waste disposal industry makes a different effect on earnings management behaviour by size of the licensed storage capacity and by location of the waste disposal site. The empirical results of this study are as follows. First, the waste disposal volume significantly influences earnings management behavior. When it comes to the size of licensed storage capacity in the small-sized capacity firms, the smaller waste disposal volume firms make more aggressive earnings management by using discretionary accruals. On the other hand, in the large-sized capacity firms, more waste disposal volume firms report higher earnings by adjusting more discretionary accruals. Second, the effects of waste disposal volume on the earnings management show different pattern depending on the location of waste disposal site. When the firms are located in the non-capital regions, the smaller waste disposal volume firms report higher earnings by adjusting discretionary accruals as well as by using real activities earnings management. However, the firms located in the capital regions show more aggressive earnings management when they have higher waste disposal volume level.

• Journal of Families and Better Life
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• v.27 no.3
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• pp.61-77
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• 2009

This study investigates the disposal of clothing and the purchasing behavior and usage of environmentally friendly clothing. After compiling data from 500 consumers who reside in Seoul, it was analyzed by ANOVA, t-test, Chi-square, and multiple regression analysis. The behavioral score for buying environmentally friendly clothing was lower than the average value of the three. The lowest value was for the purchase of used clothing, but the purchase of environmentally friendly clothing was also shown to have a low value. For the usage and disposal of clothing, unused clothing, which was mostly just left in dresser drawers, was the most preferable method. Also, exchange or resale via anInternet mall was shown to be lower than the other methods. The analysis between clothing purchase and usage as well as the disposal of clothing with socio-demographics, consumption tendencies, opinions of friends and groups, commercials and advertisements, and environmental perceptions points out differences among groups. There are statistically significant differences in the purchasing intentions of slow fashion according to socio-demographics. Female consumers between $20{\sim}25$ years of age were more likely to purchase slow fashion clothing. Consumers with a high consumption tendency who were highly influenced by commercials, friends, and groups were more likely to purchase slow fashion clothing. The influence of the average clothing expenditure on an environmentally friendly purchasing behavior and the influence of the age group on repairing and usagewas the most effective. All in all, contribution to an environmentally friendly perception was the most effective variable.

• Tunnel and Underground Space
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• v.32 no.6
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• pp.411-434
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• 2022

In deep geological disposal concept for spent nuclear fuel, it is well-known that rock mass at near-field experiences the thermal-hydraulic-mechanical (THM) coupled behavior. The mechanical properties of rock changes during the coupled process, and it is important to consider the changes into the analysis of numerical simulation and in-situ tests for long-term stability evaluation of nuclear waste disposal repository. This report collected the previous studies on indirect coupled behaviors of rock. The effects of water saturation and temperature on some mechanical properties of rock was considered, while the change in hydraulic conductivity of rock due to stress was included in the indirect coupled behavior.

• Journal of Families and Better Life
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• v.25 no.2 s.86
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• pp.23-36
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• 2007

Or this research, it was investigated the differences in the pro-environmental behaviors in purchase, use and management, and disposal of clothing by socio-demographic characteristics and other variables. In addition, it was classified Korean consumers into several comsumer groups based on the different purchase behavior style, and then investigated the difference among these consumer groups in purchase, use and management, and disposal of clothing in light of the pro-environmental behavior. The following is the summary of the main results. First, consumers with high income and ha41g a lot of clothing were less likely to purchase used-clothing while consumers who were non-married and in low-income status were more likely to rent clothing. In additions, female, married consumers, and consumers with less-educated were more likely to manage their clothing frequently. Second, it was classified consumers into several groups based on the different purchase behavior style, these were "rational purchasing", "saving-money purchasing", "regretting for their purchasing", and "over-purchasing". Third, "saving-money purchasing" group showed a high expenditure rate in the purchase of used-clothing but a low rate in "over-purchasing" group. The frequency of management of clothing was the highest in the group of "over-purchasing" and the next in the group of "saving-money purchasing". The group of "over-purchasing" were more likely to show irrational decision-making style, manage and disposal their clothing frequently, "saving-money purchasing" purchased used-clothing frequently, and the level of management of clothing were less in the group of "regretting for their purchasing".

• Journal of Korean Tunnelling and Underground Space Association
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• v.25 no.2
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• pp.175-186
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• 2023

The buffer materials in disposal hole are exposed to the decay heat from spent nuclear fuels and groundwater inflow through adjacent rockmass. Since understanding of thermal-hydro-mechanical-chemical (T-H-M-C) interaction in buffer material is crucial for predicting their long-term performance and safety of disposal repository, it is necessary to investigate the heating-hydration characteristics and consequent T-H-M-C behavior of the buffer materials under disposal conditions considering geochemical factors. In response, the Korea Atomic Energy Research Institute developed a laboratory-scale 'Lab.THMC' experiment system, which characterizes the T-H-M behavior of buffer materials under different geochemical conditions by analyzing heating-hydration process and stress changes. This technical report introduces the detail design of the Lab.THMC system, summarizes preliminary experimental results, and outlines future research plans.