Analysis of delayed neutrons' contribution for the maximum to average flux ratio in an annular pulsed reactor by Finite Volume Method

作者：Bezerra da Silva Mario Augusto; Narain Rajendra

来源：Annals of Nuclear Energy, 2018, 113: 118-121.

DOI：10.1016/j.anucene.2017.11.019

• Pulsed reactor
• Reactivity modulation
• Finite Volume Method

Generation of intense neutron sources is relevant for basic nuclear physics and for material testing and isotope production. Nuclear reactors have been utilized as sources of intense neutron fluxes, although the achievement of such levels is limited by the drawback to remove fission heat. Periodic pulsed reactors provide intense fluxes by a rotating reflector near a subcritical core. A concept for the generation of intense neutron fluxes that combines features of periodic pulsed reactors and steady state reactors was proposed by Narain (1997). This concept is known as Very Intense Continuous High Flux Pulsed Reactor (VICHFPR) and was analyzed by using one-group diffusion equation with moving boundary conditions and Finite Difference Method with Crank-Nicolson formalism, but did not consider the contribution of precursors. This research analyzed the flux distribution in the Very Intense Continuous Flux High Pulsed Reactor (VICHFPR) by using the Finite Volume Method and considered the contribution of delayed neutrons. The results showed that this contribution is not relevant for the maximum to average flux ratio, which is the most important characteristic of VICHFPR concept.

• 出版日期2018-3