영구정지후 해체가 계획된 고리 1호기 원자력발전소는 해체과정에서 다양한 종류의 방사성폐기물이 대량으로 발생될 것으 로 예상되고 있으며, 이 중 원자로 및 내부구조물은 방사능 수치가 높으므로 1차측에서 적절한 크기와 중량으로 해체된다. 고리 1호기 해체시 원자로 및 내부구조물에서 발생되는 방사성폐기물에 대하여 기존 폐기물의 자체처분 현황 및 법적 제한 사항 분석 등을 통해 적절하고 효율적인 처분방법을 마련하는 것은 중요한 사안일 것으로 판단된다. 원자로 및 내부구조물 에서 발생되는 폐기물은 중준위에서부터 자체처분까지 다양한 준위의 폐기물들이 발생되며, 이 중 자체처분 준위에 해당되 는 폐기물은 방사화 평가 결과, 원자로 상부 헤드와 상부 헤드 인슐레이션에서 발생되는 것으로 나타났다. 본 논문에서는 방사화 평가 결과를 바탕으로 자체처분 준위에 해당되는 폐기물을 자체처분 평가 코드인 RESRAD-RECYCLE 코드를 사용하여 자체처분 안전성 평가를 수행하였다. 대상 폐기물의 자체처분 시나리오를 선정하고 자체처분시 개인 및 집단별 최대선량을 계산하여 국내 원자력안전법에서 규정하는 자체처분 기준 제한치의 만족 여부를 판단하였다. 평가 결과, 전체적으로 상당히 낮은 결과값을 보이며 기준 제한치를 만족하는 결과를 나타내었으며, 핵종별 자체처분 허용농도를 도출하였다.

In this study, the tendency of flow characteristics according to the mixing design of mortar and mortar standard reference materials was analyzed based on the constituents of the standard reference materials for mortar. As a result, the plastic viscosity of the mortar tends to be maintained according to the amount of fine aggregate, while the yield value tends to increase greatly. On the other hand, in the case of the standard reference materials for mortar, the plastic viscosity tends to increase largely according to the amount of fine aggregate substitutes, while the yield value tends to be almost maintained.

The purpose of this study is to understand the rheological characteristics analysis method for the development of reference materials for cement paste considering the required performance of standard materials including particles

The mechanical properties were evaluated to examine the optimum adding amount of AC and UT viscosity agent by mixing two viscosity agent according to the adding ratio. When the ratio of AC and UT viscosity agent was 5:5, It was most suited for high-fluidity concrete with low binders by increasing workability and effect of reducing viscosity.

In recent years, in order to reduce self-weight of structural elements, the use of SCP(Steel Concrete Plate) is getting increased. Since SCP has complicated sectional shape and includes large amount of studs, the use of shrinkage reduction concrete is required. Therefore, in this study, to prevent the restrained shrinkage behavior by stud, the effects of using expansive agent (EA) and shrinkage reducing agent (SRA) was investigated.

The goal of this study is to investigate the effectiveness of the use of multiple materials in plate-like structures structure and provide engineers and designers an appropriate view point of multi-material topology optimization when making decision and information in design. Element density distribution contours of mixing multiple material densities are linked to Solid Isotropic Material with Penalization (SIMP) as a design model. The mathematical formulation of multi-material topology optimization problem solving minimum structural compliance is an alternating active-phase algorithm with the Gauss-Seidel version as an optimization model of optimality criteria. Some numerical examples are considered to illustrate the reliability and accuracy of the present design method for multi-material topology optimization.

This paper studies about the buckling analysis of multi-material structure especially compressed column using topology optimization. The buckling is stated as a constraint in the optimization problem. A clamped-pinned column with applied axial compressive load is analyzed. An active-phase algorithm is used to solve multi-phase topology optimization problem. The distribution of different materials is determined in a isotropic two-dimensional design domain. The material properties is modified based on the Solid Isotropic Material with Penalization (SIMP) interpolation approach. The Method of Moving Asymptotes (MMA) is used to update the topology design variables which is relative element densities. The optimal designs of the column structure are presented and discused in the numerical applications.

The purpose of this study is to understand the rheological characteristics analysis method for the development of reference materials for cement paste considering the required performance of standard materials including particles.

The mechanical properties were evaluated to examine the optimum adding amount of AC and UT viscosity agent by mixing two viscosity agent according to the adding ratio. When the ratio of AC and UT viscosity agent was 5:5, It was most suited for high-fluidity concrete with low binders by increasing workability and effect of reducing viscosity.

In recent years, in order to reduce self-weight of structural elements, the use of SCP(Steel Concrete Plate) is getting increased. Since SCP has complicated sectional shape and includes large amount of studs, the use of shrinkage reduction concrete is required. Therefore, in this study, to prevent the restrained shrinkage behavior by stud, the effects of using expansive agent (EA) and shrinkage reducing agent (SRA) was investigated.

In this study, global climate change scenario by Hadley Centre Global Environmental Model version 2-Atmosphere and Ocean (HadGEM2-AO) is dynamically downscaled using four regional climate models (RCMs). All RCMs with 12.5-km and 50-km resolution are integrated for continuous 27 years (1979-2005). In general, RCMs with higher horizontal resolution more reasonably capture the spatial distribution of precipitation over South Korea compared to those with lower resolution. In particular, heavy precipitation regions related to complex mountain ranges are well simulated due to detailed topography in RCMs with higher resolution. Difference between RCMs with dissimilar resolutions is relatively robust in summer compared to other seasons. This could be associated with that higher resolution and detailed topography lead to more realistic simulation of heavy summer precipitation related to mesoscale phenomena.

The goal of this study is to investigate the effectiveness of the use of multi constructional material in unit module plate of steel grid structure and provide engineers and designers an appropriate view point of multi-material topology optimization when making decision and information in design. The material distribution is implemented with the use of 3 materials in a given plate under prescribed loading and boundary conditions. Topology changes through automatic distribution of multi materials are presented during optimization procedures showing that there could be selective structural design possibility when using multi materials. The cross sections, stiffness and cost of material combination are useful information for engineers and designers in making design decision.

This study investigated the future change in surface wind over the Korean Peninsula using a high-resolution climate change scenario projected by a regional climate model (RCM). In the evaluation of historical runs (1981-2010), the RCM reasonably reproduced a 30-year annual mean surface wind and it also represented climatological seasonal wind pattern properly. To examine the future change in surface wind, the results from RCP8.5 run for 30 years (2071-2100) were compared with those from historical run. Despite of slight differences among seasons, southerly differences were overall dominant. This indicated that southerly prevailing wind for summer was intensified in the future climate, while northerly prevailing wind for other seasons was reduced. The changes in the seasonal mean surface wind were significantly associated with those in the surface pressure distribution surrounding the Korean Peninsula. In the future climate, the monthly mean wind speed was reduced compared in the present climate. However, the magnitude and annual variability of the annual maximum wind speed tended to increase in the future climate.

In this study, viscosity was minimized for production of viscosity-agent type high fluidity concrete with normal strength, and segregation resistance was maximized with viscosity agent and use of superplasticizer. Their applicability and physical property were examined.

The goal of this study is to evaluate the effectiveness of using more than one material for unit element flange of Archigird. The flange is optimized using the solution of multi-material topology optimization. In this topic, multi-material minimum structural compliance topology optimization problems is solved basedon the classical optimality criteria method. Three different types of steel material are used: SS400, SM570, UL700. The distribution of these three materials is considered by changing the participating volume of materials in the given shape. Material distribution is implemented with the use of 2 materials and 3 materials. The strain energy and the price of three steel types are used for comparison.