On fundamental quality of fission chain reaction to oppose rapid runaways of nuclear reactors

International Conference for Young Scientists, Specialists, and Postgraduates on Nuclear Reactor Physics 2016

Kulikov, G.G.^1 ; Shmelev, A.N.^1 ; Apse, V.A.^1 ; Kulikov, E.G.^1

National Research Nuclear University, MEPhI (Moscow Engineering Physics Institute), Kashirskoe Highway, 31, Moscow, Russia^1

关键词: Atomic weights;    Delayed neutrons;    Fission chain;    Neutron reflectors;    Prompt neutrons;    Prompt-neutron lifetime;    Reactor safety;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/781/1/012006/pdf
DOI  :  10.1088/1742-6596/781/1/012006

来源: IOP

【 摘 要 】

It has been shown that the in-hour equation characterizes the barriers and resistibility of fission chain reaction (FCR) against rapid runaways in nuclear reactors. Traditionally, nuclear reactors are characterized by the presence of barriers based on delayed and prompt neutrons. A new barrier based on the reflector neutrons that can occur when the fast reactor core is surrounded by a weakly absorbing neutron reflector with heavy atomic weight was proposed. It has been shown that the safety of this fast reactor is substantially improved, and considerable elongation of prompt neutron lifetime «devalues» the role of delayed neutron fraction as the maximum permissible reactivity for the reactor safety.