냉각수 유동을 고려한 핵 연료봉의 유체-고체 연계 해석

김해란(Hai-Lan Jin),이영신(Young-Shin Lee),이현승(Hyun-Seung Lee),김영지(Young-Ji Kim),박남규(Num-Kyu Park),전경락(Kyung-Rok Jeon) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.3

This study has been conducted to investigate the flow characteristics and nuclear reactor fuel rod stress under effect of coolant. Fluid structure interaction(FSI) analysis on nuclear reactor fuel rod was performed. Both fluid analysis of the coolant which flow in the axial direction and a structural analysis using the pressure data resulting from fluid analysis were carried out under different output flow velocity conditions. In the flow analysis, streamlines and maximum flow velocity at different domain were easily acquired from the analysis results. In the structure analysis, maximum stress of the nuclear reactor fuel rod was calculated and the location that has the maximum stress was found.

냉각수 유동에 따른 이중 냉각 봉다발의 복합열전달 해석

김해란(Jin Hai-Lan),이영신(Lee Young-Shin),이현승(Lee Hyun-Seung),강흥석(Kang Heung-Seok) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11

Conventional fuel rod can be cooled by outer coolant flow only in rod bundle channel while the dual-cooling fuel rod can be simultaneously cooled by inner and outer coolant flow. Dual-cooling fuel rod is a newly proposed rod that the nuclear fuel pellets were distributed across the 7 ㎜ thickness of rod. In this paper, Conjugated heat transfer(CHT) analysis was performed to check the coolant velocity effect on dual-cooling fuel rod under various velocity conditions. At first, the analysis was carried out for conventional fuel rod and compared with experiment results to confirm the analysis accuracy. Then used same analysis method to proceed the CHT analysis for dual cooling fuel rod.

문화 : 중국(中國) 가족(家族) 부양자(扶養者)의 부양(扶養)스트레스에 관한 연구(硏究) -전통적 가족부양 가치의 현재적 양상-

김해란 ( Hai Lan Jin ),김윤정 ( Yun Jeong Kim ) 한서대학교 동양고전연구소 2011 동방학 Vol.20 No.-

본 연구에서는 동양권 국가의 기본적인 이념이자 중국의 전통적인 가족부양가치관인 효와 가족주의 가치관이 현대로 오면서 변화한다는 점에 주목하여 이러한 전통적 가족부양가치관이 가족 부양 스트레스에 어떻게 적용되고 있는가를 파악하는데 연구의 목적이 있다. 구체적으로 첫째, 중국 노부모의 가족부양의 실태를 알아보았다. 둘째, 중국 가족부양자와 노부모의 사회인구학적 특성에 따른 부양스트레스의 차이를 파악하였다. 셋째, 중국 가족부양자와 노부모의 사회인구학적 특성 및 친밀감, 부양서비스가 부양스트레스에 미치는 영향을 파악하였다. 이러한 목적을 이루기 위해 중국 요녕성 대련시에 거주하는 중국의 가족부양자 328명을 대상으로 하여 설문조사를 하였다. 본 연구의 연구 결과를 요약하면 다음과 같다. 첫째, 중국 노인의 가족부양실태를 살펴본 결과 가족 부양자들이 주로 부양하고 있는 노부모는 배우자의 부모였고(시부모님), 부양하는 노부모와는 동거하지 않는 경우가 과반수를 넘었다. 함께 살지 않아도 매일 접촉하는 빈도가 높았다. 둘째, 중국 가족부양자들의 사회인구학적 특성에 따른 부양스트레스의 차이는 가족 부양자의 연령, 학력, 직업, 종교, 거주지역과 노부모의 연령, 경제수준, 가계소득원, 부양대상에 따라 유의미한 차이를 보이는 것으로 나타났다. 셋째, 중국 가족부양자의 노부모와의 사회인구학적 특성 및 친밀감, 부양서비스가 부양스트레스에 미치는 영향을 살펴보기 위하여 위계적 회귀분석을 실시한 결과, 친밀감이 부양서비스보다 중국 가족부양자의 부양스트레스에 더 큰 영향을 미치는 것으로 나타났다. 연령이 높을수록, 학력이 낮을수록, 종교가 있는 집단일수록, ADL이 낮을수록, 부모의 경제적 자립도가 낮을수록, 친밀감이 낮을수록, 신체적 부양서비스 제공이 적을수록 부양스트레스가 높게 나타났다. By focusing on Filial piety and familism, the basic ideals of Eastern countries and traditional family caregiving values of China, has changed into the modern age. Therefore in this study was aimed investigation how traditional family caregiving values were applied to family caregiving stress. In this paper, family caregivers in China are study target, and caregiving stress and its variable are study objectives. The author did a questionnaire survey to family caregivers in Dalian, a City in Liaoning Province of China, from July 15 to August 31 in 2010. Among 330 copies, 2 are dishonest. So the analysis in this research is based on the other 328 questionnaires.Abstract of research results are as follows:First, we investigate family caregivers who are looking after their parents in China. When being asked about whether they live together with their parents, more than 50% of them answered "not live together". When being asked about frequency of their visit to parents, most of them answered "everyday". When being asked about the geographical intimacy, most of them answered "live together". Second, according to social demographical characteristics of Chinese family caregivers, the differences of caregiving stress are family caregivers` age, occupation, religion, residence, and parents` age, economic level and caregiving objects. Third, in order to investigate impact on caregiving stress brought by social demographical characteristics of Chinese family caregivers and their parents, caregiving intimacy, and caregiving service, we use linear regression method, which is more obvious than impact brought by caregiving service intimacy. In other words, higher age, higher academic career, groups which have religion, lower ADL, lower economic independency of parents, lower intimacy, and lower supply of physical caregiving service lead to higher caregiving stress.

냉각유동에 의한 SMART 핵연료집합체의 압력강하변화 및 구조특성

김해란(Hai Lan Jin),이영신(Young Shin Lee),이현승(Hyun Seung Lee),박남규(Nam Gyu Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-2

본 논문에서는 냉각유동에 의한 SMART 핵연료봉집합체의 압력강하변화 및 구조특성을 연구하였다. 난류 모델인 Baseline k-ω 레이놀즈 응력 모델로서 냉각수의 유동을 모델링 하여 유제고체연계 해석을 수행하였다. 우선, 지지격자체에 지지된 핵연료봉의 진동해석을 수행하여 실험 결과와 비교하였는데 실험에서의 고유진동수는 48Hz로서 시뮬레이션 값과 2% 의 오차를 발생하였다. 압력강하는 원자력연구소에서 진행한 실험적 값과 비교하여 8%의 오차를 발생하였고 해석의 타당성을 증명하였다. 유체해석에서는 집합체를 통과하는 각 구간의 유체 속도와 이차유동에 의한 와류생성과정을 관찰하였다. 마지막으로 진동해석과 유체해석의 연계를 통하여 유체유발진동에 의한 연료봉의 변위 값을 관찰하고 최대 변위가 발생하는 곳의 변위 PSD를 계산하였다. This study has been conducted to investigate the flow characteristics and structure characteristics under effect of coolant. CFX analysis on SMART spacer grid assembly was performed with BSL k-ω Reynolds stress model. Firstly, fuel rod vibration analysis was done to confirm the nature frequency of fuel rod which was supported by spacer grid assemblies and compared with experiment results. From the experimental results, the nature frequency was 48Hz and 2% error compared with simulation results. The pressure drop at rod bundle was also calculated and compared with experiment data showed 8% error. Then in the flow analysis results, calculated flow velocity at different domain and got secondary flow streamline. Finally, flow induced vibration analysis of fuel rod was proceeded by interaction analysis of coolant flow and fuel rod vibration. As a result, the maximum displacement happened between bottom spacer grid and mid spacer grid-1. Then calculated displacement PSD at maximum displacement happed point.

냉각유동에 의한 SMART 핵연료집합체의 압력강하변화 및 구조특성

김해란(Hai Lan Jin),이영신(Young Shin Lee),이현승(Hyun Seung Lee),박남규(Nam Gyu Park) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.12

본 논문에서는 냉각유동에 의한 SMART 핵연료집합체의 압력강하변화 및 구조특성을 연구하였다. 난류 모델인 BSL 레이놀즈 응력 모델로서 냉각수의 유동을 모델링하여 유체고체연계 해석을 수행하였다. 우선, 지지격자체에 지지된 핵연료봉의 진동해석을 수행하여 실험 결과와 비교하였는데 실험에서의 고유진동수는 48 Hz 로서 시뮬레이션 값과 2% 의 오차를 발생하였다. 핵연료집합체의 압력강하는 한국 원자력연구원에서 수행한 실험적 값과 비교하여 8%의 오차가 발생하였고 해석의 타당성을 증명하였다. 유체해석에서는 집합체를 통과하는 각 구간의 유체 속도와 이차유동에 의한 와류생성과정을 관찰하였다. 마지막으로 진동해석과 유체해석의 연계를 통하여 유체유발진동에 의한 연료봉의 변위 값을 관찰하고 최대 변위가 발생하는 곳의 변위 PSD 를 계산하였다. In this study, the pressure drop changes and structural characteristics of a SMART rod bundle under the effect of a coolant were investigated. The turbulence model of the BSL Reynolds stress model was used to model the coolant flow, and a fluid solid interaction simulation was conducted. First, fuel rod vibration analysis was performed to confirm the natural frequency of the fuel rod, which was supported by spacer grid assemblies, and this was compared with experimental results. From the experimental results, the natural frequency was found to be 48 Hz, and the error compared with the simulation results was 2%. The pressure drop at the rod bundle was calculated and compared with the experimental data; it showed an error of 8%, demonstrating the simulation accuracy. In the flow analysis, the flow velocity and secondary flow at different domains were calculated, and vortex generation was also observed. Finally, through the fluid solid interaction analysis, the fuel rod displacements caused by flow-induced vibrations were calculated. Then, calculated displacement PSD at maximum displacement happed point.

지지격자 개수에 따른 핵 연료봉의 진동특성 분석

김해란(Hai-Lan Jin),이영신(Young-Shin Lee),이현승(Hyun-Seung Lee),박남규(Num-Kyu Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Each cell of spacer grids support the fuel rods continuously to maintain the spacing between the fuel rods in a nuclear reactor core and minimize the lateral displacement of fuel rods during operation. Although numbers of spacer grids support a fuel rod, the vibration behavior still exist in reactor due to coolant flow. So it is important to understand the fuel rod vibration characteristics in details. Because the spacer grid numbers greatly effect the fuel rod vibration characteristics, it is also important to know the fuel rod vibration characteristics with different number of spacer grid support conditions. In this pacer, modal simulations on fuel rod were done using the workbench 12.0 program to get nature frequencies and mode shapes under different number of spacer grid conditions. In simulation, real form fuel rod and spacer grids were used and assume the fuel rod contact tightly with the spacer grids. The mesh was performed by ICEM program and verified quality of mesh with mesh quality histogram that high quality of mesh can improve the simulation results. As a simulation results, at two supports(bottom and top spacer grid) conditions nature frequency got the most small value. At three supports(bottom, top and mid spacer grid) and four supports(bottom, top and two mid) conditions, nature frequencies were similar which 3 times higher than two support condition. At five supports(bottom, top and three mid) and seven(bottom, top, three mid and two IFM) conditions, the nature frequencies were almost same and 3 times higher than three and four supports conditions.

고해정도와 벌키화제 농도에 따른 저밀도 종이 제조

전세진(Se-Jin Jeon),남윤석(Yun-Seok Nam),최경화(Kyoung-Hwa Choi),김해란(Hai-Lan Jin),조준형(Jun-Hyung Cho) 한국펄프·종이공학회 2017 한국펄프·종이공학회 학술발표논문집 Vol.2017 No.4

제지용 충전제로서의 Diatomite 적용 가능성 평가

전세진(Se-Jin Jeon),이강미(Gang-Mi Lee),히로아키수미(Hiroaki Sumi ),김해란(Hai-Lan Jin),조준형(Jun-Hyung Cho) 한국펄프·종이공학회 2017 한국펄프·종이공학회 학술발표논문집 Vol.2017 No.4

급기 풍속 및 종류에 따른 VAV 디퓨저의 CFD 시뮬레이션 해석

양태호(Tae Ho Yang),김해란(Hai Lan Jin),이영신(Young Shin Lee),박수찬(Soo Chan Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5-2

한국 다문화시대 조선족 이주노동자들의 사회적 지위에 관한 고찰

이장섭(Lee Jang Sub),김해란(Jin Hai Lan),양양(Yang Yang) 전남대학교 글로벌디아스포라연구소 2011 전남대학교 세계한상문화연구단 국제학술회의 Vol.2011 No.2

Under the impact of globalization, South Korea, a country with the myth of ‘single nation’ for thousands of years and trying to keep its own tradition and social identity, also has entered into the multi-cultural society. This paper tries to investigate the multi-cultural policy status of Korean Chinese migrant labors in South Korea. Meanwhile, it is also hoped to set the direction for the government to make and implement the multi-cultural policies. The investigation shows that under the multi-cultural era, the South Korea government has carried out a complex policy to the Korean Chinese migrant labors, which including the inclusive policy, exclusive policy and informal complicated pluralism policy. Therefore, the government of South Korea should carry out an open migration policy.