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열성층 현상을 고려한 원전 안전주입계통 배관 열피로 평가
성희동(H.D. Sung),김선혜(S.H. Kim),김익중(I.J. Kim),김영진(Y.J. Kim),장윤석(Y.S. Chang),박정순(J.S. Park),최영환(Y.H. Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In recent years, several piping failures caused by thermal stratification have been reported in some nuclear power plants. However, this kind of thermal fatigue was not considered when the old vintage nuclear power plants were designed. Thermal stratification usually is generated by turbulent penetration from RCS to branch line or leakage through damaged part of valve in branch line. In this research, using CFD analysis, characteristics of thermal stratification in a safety injection system of PWR plant were investigated and thermal fatigue evaluation was also conducted. To do this, first, CFD analyses were carried out on valve isolation model and out-leakage model. As a result, in valve insolation model, thermal stratification generated in front of 1st valve for a moment, however the temperature difference was small. In contrast, significant thermal stratification generated at the rear of 1st valve in out-leakage model. Therefore, thermal stress and fatigue evaluation were carried out based on the temperature result of out-leakage model.
1993년에 한국에서 발생한 쯔쯔가무시병의 혈청역학 조사
한명준,장우현,박경희,김익상,성승용,김익중,기선호,최명식 대한감염학회 1994 감염 Vol.26 No.2
1993년도에 발생한 쯔쯔가무시병의 발생실태를 파악하기 위하여 전국 20개 병원의 협조를 얻어 임상적으로 쯔쯔가무시병, 렙토스리파병, 발진열 및 신증후출혈열로 의심되는 급성열성환자 총 5,381명에 대한 혈청을 대상으로 R. tsutsugamushi에 대한 항체를 측정 분석하여 아래와 같은 성적을 얻었다. 1) 총 5,381예중 2,321에인 43.1%가 항체양성자였으며 남자가 49.3% 여자가 45.6%의 항 체 양성율을 보였다. 2) 40대가 전체 항체 양성자수의 23.7%를 차지하여 가장 많았으며 30대에서 60대가 전체 항체 양성자수의 72.2%를 차지하고 있었다. 3) 10월과 11월에 발생한 항체 양성자수는 전체의 87%를 차지하였다. 4) 항체 양성자수의 지역별 분포를 보면 경상남도 16. 9.0%, 경상북도 16.57%로 가장 많게 나타났으며 지역에 따라 항체 양성자 발생수의 차이는 있으나 우리나라 전지역에서 관찰되었다. To understand the seroepidemiological patterns of scrub typhus in Korea, 5,381 patients sera with acute febrile episodes from 20 local hospitals were tested for the antibody to Rickettsia tsutsugamushi (R. tsutsugamushi), by indirect immunofluorescent antibody technique from January to December in 1993. The results were summarized as follows. 1) Out of 5,381 patients, 2,231(43.1%) patients showed positive reaction to R. tsutsugamushi and the female outnumbered the male slightly. 2) Among seropositives to R. tsutsugamushi, the age of the fourties were 23.7%, and between the thirties and sixties of the age were 72.2%. 3) Scrub typhus seemed to occur throughout the country in Korea. 4) Scrub typhus was the most prevalent in October and November.