• 한국압력기기공학회 논문집
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• 제10권1호
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• pp.44-50
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• 2014

There were many flaw issues of reactor vessel head penetration in USA fleets. USNRC issued 10CFR50.55a to implement reactor vessel head penetration ultrasonic examination performance demonstration(PD) in US for enhancement of inspection reliability. After September 2009, all US utilities inspected their RVHP with PD qualified system. Korea Hydro and Nuclear Power Company(KHNP) have developed reactor vessel head penetration performance demonstration system for ultrasonic test to apply for pressurized light-water reactor power plants in accordance with 10CFR50.55a since September 2011. RVHP configuration surveying and analysis, code requirement analysis, and performance demonstration specimen design were performed up to this day. Fingerprinting of manufactured specimen, development of test data management program, development of operation procedure, input of flawed data, and development of final report will be performed for the next step. This paper describes the development status of the performance demonstration system for reactor vessel head penetration ultrasonic examination in Korea.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제15권4호
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• pp.265-269
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• 2009

정형명세기법은 안전최우선시스템 소프트웨어의 안전성을 일정 수준 이상 보장할 수 있는 기법으로서, 원자력 발전소의 디지털 제어시스템의 개발에 사용되고 있다. 정형명세기법 NUSCR로부터 Programmable Logic Controller(PLC) 시스템을 구현하기 위한 소프트웨어인 Function Block Diagram(FBD) 프로그램을 자동으로 생성하는 기법[1]이 개발되었으나, 이를 지원하는 자동화 도구가 없어 이 기법이 널리 사용되지 못하였다. 본 논문에서는 이어 자동생성 기법을 지원하기 위하여 개발된 자동화 도구 NuSCRtoFBD를 소개한다. 본 연구에서 제안하는 NuSCRtoFBD 도구를 사용하여 NuSCR로부터 FBD를 자동생성 함으로써, 기존의 수동 프로그래밍 작업에서 발생했던 다수의 오류들을 줄일 수 있다.

• Computers and Concrete
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• 제13권1호
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• pp.1-16
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• 2014

To evaluate the behavior of the advanced unbonded pre-stressed concrete containment vessel (UPCCV) for one typical China nuclear power plant under Japan's March 11 earthquake, five nonlinear time history analysis and a nonlinear static analysis of a 1:10 scale UPCCV structure have been carried out with MSC.MARC finite element program. Comparisons between the analytical and experimental results demonstrated that the developed finite element model can predict the earthquake behavior of the UPCCV with fair accuracy. The responses of the 1:10 scale UPCCV subjected to the 11 March 2011 Japan earthquakes recorded at the MYG003 station with the peak ground acceleration (PGA) of 781 gal and at the MYG013 station with the PGA of 982 gal were predicted by the dynamic analysis. Finally, a static analysis was performed to seek the ultimate load carrying capacity for the 1:10 scale UPCCV.

• 방사성폐기물학회지
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• 제18권spc호
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• pp.63-74
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• 2020

The operational safety assessment is an important part of a safety case for the deep geological repository of spent fuels. It consists of different stages such as the identification of initiating events, event tree analysis, fault tree analysis, and evaluation of exposure doses to the public and radiation workers. This study develops a probabilistic safety assessment method for the operational safety assessment and establishes an assessment framework. For the event and fault tree analyses, we propose the advanced information management system for probabilistic safety assessment (AIMS-PSA Manager). In addition, we propose the Radiological Safety Analysis Computer (RSAC) program to evaluate exposure doses to the public and radiation workers. Furthermore, we check the applicability of the assessment framework with respect to drop accidents of a spent fuel assembly arising out of crane failure, at the surface facility of the KRS⁺ (KAERI Reference disposal System for SNFs). The methods and tools established through this study can be used for the development of a safety case for the KRS⁺ system as well as for the design modification and the operational safety assessment of the KRS⁺ system.

• Journal of Microbiology and Biotechnology
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• 제23권11호
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• pp.1544-1553
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• 2013

Despite the importance of acetate kinase in the metabolism of bacteria, limited structural studies have been carried out on this enzyme. In this study, a three-dimensional structure of the Escherichia coli acetate kinase was constructed by use of molecular modeling methods. In the next stage, by considering the structure of the catalytic intermediate, trifluoroethanol (TFE) and trifluoroethyl butyrate were proposed as potential inhibitors of the enzyme. The putative binding mode of these compounds was studied with the use of a docking program, which revealed that they can fit well into the enzyme. To study the role of these potential enzyme inhibitors in the metabolic pathway of E. coli, their effects on the growth of this bacterium were studied. The results showed that growth was considerably reduced in the presence of these inhibitors. Changes in the profile of the metabolic products were studied by proton nuclear magnetic resonance spectroscopy. Remarkable changes were observed in the quantity of acetate, but other products were less altered. In this study, inhibition of growth by the two inhibitors as reflected by a change in the metabolism of E. coli suggests the potential use of these compounds (particularly TFE) as bacteriostatic agents.

• 한국주거학회논문집
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• 제13권4호
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• pp.19-26
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• 2002

Despite its relatively small size, at least compared to other architectural programs, the house figures large in the cultural imagination. Closely identified with the individual and nuclear family, it has been frequently considered as an expression of widely held, even universal, values. Conversely, the private house has also been emblematic of more subjective desires, that change not only from person to person but from generation to generation. Certain conclusions can be drawn about the status of the private house at the end of the century, both as cultural invention and as a product of the autonomous discipline of architecture. The contemporary loftlike living space is similarly associated with work, given its emergence as an alternative home for individuals wanting space in which to live and work. In the case of what might be called the "un-private house", it is ofen a digital presence and the change of family system. This study was conducted to define the un-private house through public/private. The architectural characteristics of un-private house are as follows; 1) Alternatives- large open space with multiple function and collective free plan 2) Dematerialization- steel and glass with visual openness and ambiguity 3) Digital & Interfaces- fold and screen using technology and program. Especially, the un-private house is designed to provide individuals with emotional, superficial, and synergistic space, focusing on the personal life-style.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2002년도 학술대회지
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• pp.397-400
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• 2002

Vapor explosion is one of the most important problems encountered in severe accident management of nuclear power plants. In spite of many efforts, a lot of questions still remain. So, KAERI launched a real experimental program called TROI using $UO_{2}$ and $ZrO_{2}$ to investigate the vapor explosion. Besides TROI tests, a small-scale experiment with molten-tin/water system was performed to quantify the characteristics of vapor explosion and to understand the phenomenology of vapor explosion. A vapor explosion was observed while the amount of air bubble and water temperature were systematically varied The mass and temperature of tin are $50\;g\;and\;150^{\circ}C$, respectively. Water temperature is set to $24^{\circ}C\;and\;50^{\circ}C$. The void fraction of air bubble ranges from $0\;to\;10\;{\%}$. The strength of vapor explosion was measured using dynamic pressure sensors attached in reactor tube wall. as a function of void fraction. In addition, a high speed video filming up to 1,000 flame/sec was taken in order to visually investigate the behavior of the vapor explosion .

• 대한기계학회논문집A
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• 제39권2호
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• pp.187-193
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• 2015

STS310S 는 열전달 능력이 우수하여, 열교환기용 열전달 튜브 재료로서 많이 사용된다. 튜브의 안쪽은 가스와 물의 혼합물이 흐르고, 튜브 바깥은 화염이 흐른다. 이와 같은 환경에서 튜브는 취화하였고, 누설이 발생하였다. 균열은 안쪽에서 바깥으로 전파하여 취성파괴 하였다. 본 연구는 취성파괴의 원인을 실험과 고찰을 통하여 규명하고, 해결 방법을 제안하였다.

• 한국식생활문화학회지
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• 제12권3호
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• pp.323-329
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• 1997

The research was conducted to investigate the children's consumption pattern and preference of Korean rice cake by analyzing the relation among their socio-demographic backgrounds. This study provides basic information for systematic development and wide spread of Korean rice cake as a traditonal Korean food. A self completed questionnaire survey of 639 elementary school students in Seoul was undertaken. A survey questionnaire consisted of two parts including demographic backgrounds, children's consumption pattern and preference of Korean rice cake. A likert scale of one to five was used to determine the childrem's preference of Korean rice cake. Statistical data analysis was done using the SPSS/PC program for descriptive analysis and $x^2$ test. Approximately half of the participants were male (51.5%) and 5-degree year (50.7%) students. 77.2% of respondents were nuclear families. The results of eating frequency rate showed that 57.1% students had Korean rice cake once a month followed by once a week (18.8%), once per two months (12.2%) and once per six months (10.5%). The major reasons for having Korean rice cake were good taste (55.2%), healthy food (22.3), our traditional food (17.3%), and etc (2.2%) in order. Average children's preference score of 14 Korean rice cakes was $2.82{\pm}1.59$ out of 5, with the highest score of 4.30 for Songpyun and the lowest score of 1.06 for Bukumi.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2004년도 춘계학술대회논문집
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• pp.125-130
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• 2004

The vibration and buckling characteristics of the capsule for fuel irradiation test are studied. The natural frequencies of the capsule in air and under water are obtained by modal testing and finite element(FE) analysis using ANSYS program, and accelerations with flow are measured to estimate the compatibility with the operation requirement of the HANARO reactor. The experimental fundamental frequency of the capsule in the x and z direction is 8.5Hz and 8.75Hz in air, and 7.5Hz and 7.75Hz under water, respectively. The maximum amplitude of accelerations under the normal operating condition is measured as 11.0m/s$^2$ that is within the allowable vibrational limit(18.99m/s$^2$) of the reactor structure. Also, the maximum displacement at 100% flow is calculated as 0.13mm which is not interference with other nearby structures. FE analysis results show that the natural frequencies are found to be similar to those of the modal testing when three supporting parts are considered as simply supported conditions. From the buckling analysis, when the loading tool is applied, the critical buckling load of the capsule is 233N.