摘要
反应性系数与反应堆的安全有着密切的关系。在反应堆正常运行工况及事故瞬态下,它起着反应性随外界条件和反应堆状态变化的动态反馈作用。由于电厂运行条件的变化,例如:反应堆功率、慢化剂温度、燃料芯块温度以及反应堆压力和慢化剂空泡份额等变化,反应性系数对这些变化产生反馈,改变中子的增殖系数Keff,使反应堆的反应性发生变化。在含MOX燃料堆芯中,由于能谱变硬,与全UO2堆芯相比,中子学参数发生变化,将给事故分析带来不同程度的影响。本文主要对含MOX燃料堆芯的慢化剂温度系数(MTC)、多普勒温度系数、停堆裕量、硼微分价值等中子学参数进行研究。研究各反应性系数在不同MOX装载份额的变化规律并分析其在MOX燃料和UO2燃料中的异同。
Reactivity coefficient is closely related to reactor safety. Under normal operating conditions and transient accident conditions, it acts as a dynamic feedback of reactivity with changes of external conditions and reactor state. As a result of changes in the operating conditions of the plant, such as the reactor power, moderator temperature, fuel pellet temperature, reactor pressure and moderator cavitation fraction, the reactivity coefficient generates feedback to these changes, changing the neutron multiplication coefficient Keff and making the reactor reactivity change. In mox-containing fuel cores, due to the hardening of the energy spectrum and the changes in the molecular parameters compared with the full UO2 cores, the accident analysis will be affected to different degrees. In this paper, the moderator temperature coefficient （MTC）, doppler temperature coefficient, shut down margin and boron differential value of MOX fuel core were studied. The variation rule of each reactivity coefficient in different MOX loading share was studied and the differences and similarities between MOX fuel and UO2 fuel were analyzed.
出处
《科技创新导报》
2018年第23期55-59,共5页
Science and Technology Innovation Herald
