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Analysis of Nuclear Power Plant Load Follow Operation by Temperature Reduction Method
Park, Sang-Yoon,Park, Goon-Cherl,Lee, Un-Cherl,Kang, Chang-Sun,Kim, Chang-Hyo,Chung, Chang-Hyun Korean Nuclear Society 1986 Nuclear Engineering and Technology Vol.18 No.3
The inlet coolant temperature reduction technique has been used to extend the load follow operation further in the end-of-cycle-life(EOL). In order to simulate the technique and calculate the nuclear characteristics of a PWR core according to the load follow operation, the three dimensional computing system has been established. The analysis was performed in both MINB and SPINR modes of typical 12-3-6-3 locad follow operation for the EOL of KNU-1 plant. Moreover, the capability of return-to-power has been also tested for those two modes with the system analysis by the RETRAN-02 code. The results show that it has no difficulty to extend the load follow operation further in the EOL by applying the inlet coolant temprature reduction, and also the spinning reserve capacity(SRC) increases by 13% in MINB mode and 14% in SPINR mode Bore that used by control rods only, for 14$^{\circ}$ F drop in the inlet temperature.
Film Boiling Heat Transfer from Relatively Large Diameter Downward-facing Hemispheres
Kim Chan Soo,Suh Kune Y.,Park Goon Cherl,Lee Un Chul,Yoon Ho Jun Korean Nuclear Society 2003 Nuclear Engineering and Technology Vol.35 No.4
Film boiling heat transfer coefficients for a downward-facing hemispherical surface are measured from the quenching tests in DELTA (Downward-boiling Experimental Loop for Transient Analysis). Two test sections are made of copper to maintain Bi below 0.1. The outer diameters of the hemispheres are 120 mm and 294 mm, respectively. The thickness of both the test sections is 30 mm. The effect of diameter on film boiling heat transfer is quantified utilizing results obtained from the two test sections. The measured heat transfer coefficients for the test section with diameter 120 mm lie within the bounding values from the laminar film boiling analysis, while those for diameter 294 mm are found to be greater than the numerical results on account of the Helmholtz instability. There is little difference observed between the film boiling heat transfer coefficients measured from the two test sections. In addition, the higher thermal conductivity of copper results in the higher minimum heat flux in the tests. For the test section of diameter 120 mm, the Leidenfrost point is lower than that for the test section of diameter 294 mm. Destabilization of film boiling propagates radially inward for the 294 mm test section versus radially outward for the 120 mm Test Section.
Astaxanthin 처리 산란계로부터 생산된 난황의 Mouse에 대한 Catabolic Response Overcome 효과
김홍출(Hong-Chul Kim),박숙자(Sook-Jahr Park),박철우(Cherl-Woo Park),김영림(Young-Rim Kim),김정환(Jeong-Hwan Kim),최의성(Eui Sung Choi),조현종(Hyeon-Jong Cho),조용운(Yong Un Cho),하영래(Yeong Lae Ha) 한국식품영양과학회 2001 한국식품영양과학회지 Vol.30 No.6
Astaxanthin을 산란계에 경구 투여하여 얻은 AEY에는 총 2.88 mg%의 carotenoid가 함유되어 있었다. Carotenoid 성분을 HPLC로 분석한 결과, CEY에는 존재하지 않는 α-cryptoxanthin, canthaxanthin, cynthiaxanthin, triol 등이 AEY에서 확인되었다. CEY에서는 존재하지 않기 때문에 이들은 astaxanthin의 대사생성물로 예상할 수 있다. AEY는 LPS로 유발한 mouse의 catabolic response overcome의 효과 시험에서 control구에 비해 유의성있는 체중 감소 억제 효과를 보였다. 또한 AEY는 LPS 처리에 의한 면역기관에 미치는 영향에서는 췌장과 간의 체중에 대한 상대적 비율을 증가시켰다. 따라서 AEY 처리가 면역작용을 하는 세포의 활성에 관여하는 것으로 생각되고 이것은 AEY 처리구에서 관찰되는 α-cryptoxanthin, canthaxanthin, cynthiaxanthin, triol 등에 의한 것으로 추측된다. Effect of the egg yolks from laying hens intubated, p.o., astaxanthin (designated AEY) on the catabolic response overcome of mice was examined. Female ICR mice (6~7 weeks of age) were adapted in a temperature- and humidity-controlled house for one week and randomly divided into 5 groups (6 mice/cage/treatment). Mice were intubated p.o., AEY (5, 10 and 15 mg), control egg yolk (CEY, 10 mg), or fish oil (5 mg) dissolved in 0.2mL phosphate buffered saline (PBS) every two days for 14 days. At day 15, the 0.1 mL of lipopolysaccharide solution (LPS, 30 μg/0.1 mL 10 mM HEPES) was injected through tail vein, and then, the body weight of mouse and the amount of feed intake were measured over a period of 72 hours. Control group mice were received only PBS and LPS. AEY treatment suppressed the loss of mice body weight in a dose-response manner. Twenty four hours post LPS injection, the reduced body weight per mouse of AEY 5, AEY 10, and AEY 15 mg treatment groups was 3.70, 3.54, and 3.25 g, respectively. Body weight suppression effect of AEY treatment was greater than that of CEY, but less than fish oil. AEY treatment did not alter thymus weight, but increased the weight of spleen or liver. These results indicate that AEY suppressed the loss of body weight by LPS via any function of the spleen and/or liver.
Astaxanthin 처리 산란계로부터 생산된 난황이 Mouse Liver Microsome의 산화에 미치는 영향
김홍출(Hong Chul Kim),박숙자(Sook Jahr Park),김정곤(Jung Kon Kim),박철우(Cherl Woo Park),조용운(Yong Un Cho),조현종(Hyeon Jong Cho),하영래(Yeong Lae Ha) 한국식품영양과학회 2002 한국식품영양과학회지 Vol.31 No.1
AEY의 acetone추출물이 mouse liver microsome의 산화에 미치는 영향을 조사하였다. Mouse liver microsome에 함유된 단백질 함량은 AEY 처리구가 CEY 처리구에 비해 상대적으로 7~48%정도가 증가하였다. 지방산 분석 결과, CEY 처리에 비해 AEY 처리구에서 stearic acid를 포함하는 포화지방산의 함량비가 상대적으로 높았으며, oleic acid, linoleic acid 등을 함유하는 불포화지방산의 함량비가 현저히 감소하였다. AEY 처리구는 Fe2+가 관여하는 Asc/Fe^(+2), NADPH/Fe^(+2)를 산화유도물질로 사용한 경우에 TC와 비슷하거나 보다 강력한 항산화 효과를 보였다. ABIN이나 CuOOH가 산화유도물질로 작용할 시에는 AEY처리에 의해 유의성있는 항산화 효과가 나타나지 않았다. Effect of the egg yolks from laying hens intubated, p.o., astaxanthin (designated AEY) on the oxidation of mouse liver microsome was investigated using female ICR mouse (6~7 weeks of age). Mice were adapted in a temperature- and humidity-controlled house for one week and randomly divided into 7 treatment groups (10 mice/cage/treatment). Mice were intubated p.o., AEY (50, 100 and 150 mg) or control egg yolk (CEY, 150 mg) every week for 3 weeks. BHT (5 mg) and α-tocopherol (50 mg) were fed to mice as positive control. At week 4, the liver microsome was prepared from sacrificed mice. Protein content of mouse liver microsome with AEY treatment was relatively higher than that with CEY treatment. AEY treatment remarkably lowered the content of unsaturated fatty acids including oleic acid and linoleic acid, but raised that of the saturated fatty acids including stearic acid. AEY group showed relatively higher antioxidative activity than CEY, when used Asc/Fe^(+2) or NADPH/Fe^(+2) as oxidant. Antioxidative activity of AEY was more effective than α-tocopherol, but less effective than BHT.