CAJ | 학술논문

提出了一种适用于分布式发电系统的小型自然循环钠冷堆-AMTEC系统。通过对堆芯的临界计算和热工水力分析，研究了堆芯燃料装载量不变情况下，芯块半径、燃料棒长度和圈数对堆芯有效增殖因数 kef 、堆芯压降和传热的影响。同时分析了不同额外停堆裕量下，B4 C吸收层厚度和堆芯初始剩余反应性随燃料棒圈数的变化关系。计算结果表明：保持堆芯当量直径和冷却剂通道总截面积不变的情况下，减少燃料棒圈数和活性区长度不仅可增加 kef ，且能降低堆芯压降；为提高额外停堆裕量需增加吸收层厚度，但降低了堆芯初始剩余反应性，不利于电厂的经济性。
제출료일충괄용우분포식발전계통적소형자연순배납랭퇴-AMTEC계통。통과대퇴심적림계계산화열공수력분석，연구료퇴심연료장재량불변정황하，심괴반경、연료봉장도화권수대퇴심유효증식인수 kef 、퇴심압강화전열적영향。동시분석료불동액외정퇴유량하，B4 C흡수층후도화퇴심초시잉여반응성수연료봉권수적변화관계。계산결과표명：보지퇴심당량직경화냉각제통도총절면적불변적정황하，감소연료봉권수화활성구장도불부가증가 kef ，차능강저퇴심압강；위제고액외정퇴유량수증가흡수층후도，단강저료퇴심초시잉여반응성，불리우전엄적경제성。
A small natural-circulation sodium-cooled reactor-AM TEC system was pres-ented as a distributed generation system . According to the criticality calculation and thermal-hydraulic analysis of the core when the total fuel mass was constant ,the influ-ence of pellet radius ,fuel pin length and the number of rings of fuel pins upon the effec-tive multiplication factor kef , pressure drop across the core and heat transfer was analyzed .Additionally ,the B4 C absorber thickness and beginning-of-life excess reactivi-ty under different numbers of rings of the fuel pins were studied when the assumed addi-tional shutdown margin was different .The results show that decreasing the number of rings and active fuel length would increase kef and decrease pressure drop across the core w hen the core equivalent diameter and total cross-sectional area of the coolant channel are unchanged .In order to increase additional shutdow n margin ,the absorber thickness should be increased while the beginning-of-life excess reactivity and power plant econo-my would decrease .