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MARS-KS를 이용한 APR1400 노형의 저온과압보호 성능 평가
장원준(Won Jun Chang),정애주(Ae Ju Jeong),신병수(Byung Soo Shin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
This study is to assess the performance of low temperature overpressure protection for APR1400 nuclear power plant. The most severe possible transients for mass addition and energy addition are coolant injection by sudden startup of four safety injection pump and one charging pump and heat transfer from secondary side of steam generator by startup of one reactor coolant pump. The transients was analyzed using MARS-KS, 1-dimensional thermal hydraulic code. The initial condition was determined as the possible lowest temperature condition in order to maximize the expansion ratio of coolant. The modeling for numerical analysis was also conservative. From the analysis results, it was concluded that the design parameters of relief valve for LTOP was determined appropriately to maintain the peak pressure of reactor coolant system under the design envelope.
Chang-Hyuk Choi(최창혁),Se-Sik Kim(김세식),Won-Jun Chang(장원준),Hee-Soo Kim(김희수) 대한정형외과학회 2014 대한정형외과학회지 Vol.49 No.2
인상 70 kg, 용상 90 kg의 평균기록을 지닌 16세 여자 역도선수가 주관절의 만성 내측 측부인대 손상으로 진단되어 인대 재건술을 시행하였다. 술 전 및 술 후 6주, 3개월, 6개월, 9개월과 1년에 초음파를 이용하여 인대 재건상태를 확인하였으며, 초음파 검사상 수 평거리는 각각 8.4 mm, 2.0 mm, 2.6 mm, 2.8 mm, 2.7 mm, 2.7 mm였고, 수직거리는 -1.2 mm, 2.4 mm, 1.0 mm, 0.0 mm, 0.0 mm, 0.0 mm로 측정되었다. 수술 후 1년째 역도 기록은 인상 65 kg, 용상 90 kg으로 회복되었다. 초음파를 이용한 내측 측부인대의 연속적인 검사는 재활 상태를 평가하며 시합 복귀시기를 결정하는 데 유용하게 이용될 수 있을 것으로 생각되었다. A 16-year-old female weight-lifter with average records of 70 kg for the snatch event and 90 kg for the clean and jerk event suffered chronic ulnar collateral ligament injury, and underwent ulnar collateral ligament reconstruction. An ultrasonographic evaluation was performed at six weeks, three months, six months, nine months, and one year after the operation. The horizontal and vertical distances measured during the initial ultrasonographic examination as well as at six weeks, three months, six months, nine months, and one year after the operation were 8.4 mm, 2.0 mm, 2.6 mm, 2.8 mm, 2.7 mm, 2.7 mm, and -1.2 mm, 2.4 mm, 1.0 mm, 0.0 mm, 0.0 mm, 0.0 mm, respectively. The lifting records at one year after the operation were 65 kg for the snatch event and 90 kg for the clean and jerk event. The ultrasonographic method of serial examination was useful for evaluation of the rehabilitation program and for deciding on the time to return to competition.